CHANGES.md

Unreleased

Added

• irmin-git
  • Expose Content_addressable type (#2329, @art-w)

Fixed

• irmin-client
  • Fix a fd leak when using clone (#2322, @samoht)
• irmin-git
  • Fix git sync example (#2327, @art-w)
  • Fixed issue with two subsequent Irmin-git repos, where one repo would lose the ability to find its root path (#2326, @zazedd)
• irmin
  • Fix CI, update dependencies (#2321, @smorimoto)
  • Update documentation (#2323, #2324, #2325, @christinerose)
• irmin-cli
  • Fix uncaught exception (#2326, @art-w)

Removed

• irmin
  • Removed ?allow_duplicate parameter from the Conf.key function (#2326, @zazedd)

3.9.0 (2023-10-05)

Added

• irmin-server
  • Added irmin-server package (#2031, @zshipko)
• irmin-client
  • Added irmin-client package to connect to irmin-server instances (#2031, @zshipko)
• irmin
  • Add pretty printers for Commit, Tree, Info, Status, Branch when using utop (@metanivek, #1839)

Fixed

• irmin-pack
  • Fix index integrity check for v3 stores (#2267, @metanivek)

Removed

• irmin-http
  • Removed irmin-http since it is not compatible with generic keys. irmin-grapqhl or irmin-server should be used instead. (#1902, @zshipko)
• irmin
  • Removed stream proofs. We now only have Merkle tree proofs. This simplifies the maintenance of that part of the code, as ensuring the correct order of cached IO operations was tricky for stream proofs (#2275, @samoht)

Changed

• irmin-git
  • Moved lower bounds to git.3.14.0 to use new function (#2277, @metanivek)

3.8.0 (2023-07-06)

Added

• irmin

  • Change behavior of Irmin.Conf.key to disallow duplicate key names by default. Add allow_duplicate optional argument to override. (#2252, @metanivek)

• irmin-pack

  • Add maximum memory as an alternative configuration option, lru_max_memory, for setting LRU capacity. (@metanivek, #2254)

Changed

• irmin

  • Lower bound for mtime is now 2.0.0 (#2166, @patricoferris)

• irmin-mirage-git

  • Lower bound for mirage-kv is now 6.0.0 (#2256, @metanivek)

• irmin-pack

  • Removed dict_auto_flush_threshold and suffix_auto_flush_threshold configuration. (#2235, @art-w)

Fixed

• irmin-cli
  • Changed --store irf to --store fs to align the CLI with what is published on the Irmin website (#2243, @wyn)

3.7.2 (2023-06-16)

Fixed

• irmin

  • Fix performance issue in Tree.length (#2258, @art-w)

• irmin-pack

  • Fix snapshot export when using lower layer (#2257, @metanivek)

3.7.1 (2023-05-24)

Fixed

• irmin-pack
  • Fix issue when migrating v2 stores to use lower layer (#2241, @metanivek)
  • Fix issue when calling GC for a commit in the lower after migration (#2242, @metanivek)

3.7.0 (2023-04-26)

Added

• irmin

  • Add Conf.pp and Conf.equal to print and compare configuration values (#2227, @samoht)
  • Add a clear optional arguments to all function that adds a new commit: Commit.v, set, set_tree, remove, test_and_set, test_and_set_tree, test_set_and_get, test_set_and_get_tree, merge, merge_tree and with_tree. This new argument allows to control whether the tree caches are cleared up after objects are exported to disk during the commit. (#2225, @samoht)

• irmin-pack

  • Add configuration option, lower_root, to specify a path for archiving data during a GC. (#2177, @metanivek)
  • Add is_split_allowed to check if a store allows split. (#2175, @metanivek)
  • Add add_volume to allow creating new empty volume in lower layer. (#2188, @metanivek)
  • Add a behaviour function to the GC to check wether the GC will archive or delete data. (#2190, @Firobe)
  • Add a migration on open_rw to move the data to the lower_root if the configuration was enabled (#2205, @art-w)

Changed

• irmin
  • Expose type equality for Schema.Info to avoid defining the info function multiple times when using similar stores (#2189, #2193, @samoht)
• irmin-pack
  • GC now changes its behaviour depending on the presence of a lower layer. (#2190, @Firobe)
  • Split now raises an exception if it is not allowed. It is not allowed on stores that do not allow GC. (#2175, @metanivek)
  • GC now supports stores imported V1/V2 stores, in presence of a lower layer only. (#2190, @art-w, @Firobe)
  • Upgrade on-disk format to version 5. (#2184, @metanivek)
  • Archive to lower volume does not copy orphaned commits. (#2215, @art-w)

Fixed

• irmin-pack
  • Unhandled exceptions in GC worker process are now reported as a failure (#2163, @metanivek)
  • Fix the silent mode for the integrity checks. (#2179, @icristescu)
  • Fix file descriptor leak caused by mmap. (#2232, @art-w)

3.6.1 (2023-03-15)

Fixed

• irmin-pack
  • Clear LRU when calling reload after a GC (#2200, @metanivek)

3.5.2 (2023-03-02)

Fixed

• irmin-pack
  • Clear LRU when calling reload after a GC (#2200, @metanivek)

3.6.0 (2023-02-16)

Changed

• irmin-pack
  • Improve GC reachability traversal to optimize memory, speed and remove the need for temporary files. (#2085, @art-w)

3.5.1 (2023-01-10)

Fixed

• irmin-pack
  • Integrity check of a commit works on stores using the minimal indexing strategy. (#2160, @icristescu)

3.5.0 (2022-12-15)

Added

• irmin-pack
  • Add Irmin_pack_unix.Stats.Latest_gc which is now the parameter of GC's finished callback (#2089, @Ngoguey42)
  • Add Gc.oldest_live_commit which returns the key of the commit on which the latest gc was called on. (#2110, @icristescu)
  • Add split to create a new suffix chunk. Subsequent writes will append to this chunk until split is called again. (#2118, @icristescu)
  • Add create_one_commit_store to create a new store from the existing one, containing only one commit. (#2125, @icristescu)

Changed

• irmin-pack
  • Upgraded on-disk format to version 4. (#2110, @icristescu)
  • Detecting control file corruption with a checksum (#2119, @art-w)
  • Change on-disk layout of the suffix from a single file to a multiple, chunked file design (#2115, @metanivek)
  • Modify GC to work with new chunked suffix. See examples/gc.ml for a demonstration of how it works with the new split function. (#2126, @metanivek)

3.4.3 (2022-10-19)

Fixed

• irmin-pack
  • Fix read-only opening flags of mapping for read-only opening of stores that do not have read-write rights on the files. (#2121, @Ngoguey42)

3.4.2 (2022-10-06)

Added

• irmin

  • Add test_set_and_get* functions to retrieve commit associated with an update to the store (#2074, @patricoferris)

• irmin-graphql

  • Expose test_set_and_get function as a new mutation (#2074, @patricoferris)
  • Add contents_hash function to get a value's hash (#2099, @patricoferris)

• irmin-pack

  • Expose Gc.cancel to abort a running GC (#2101, @art-w)
  • Add Irmin_pack_unix.Stats.Latest_gc which is now the parameter of GC's finished callback (#2089, @Ngoguey42)

• irmin-tezos-utils

  • Add package irmin-tezos-utils containing a graphical tool for manual pack files analysis. (#1939, @clecat)

Changed

• irmin-pack
  • irmin_pack_mem no longer exposes disk specifics functions (#2081, @icristescu)
  • Move unix specific details for Pack_key and Pack_value from irmin-pack to irmin-pack.unix (#2084, @metanivek)
  • Remove unnecessary files at open_rw and after a failed GC (#2095, @art-w)
  • Move the gc commit from the suffix file to the prefix. (#2102, @icristescu)

Fixed

• irmin-pack
  • Fix data race in RO instances when reading control file (#2100, @Ngoguey42)
  • Fix bugs in gc related to commits that share the same tree. (#2106, @icristescu)
  • Fix the traverse pack files commands in the irmin-tezos CLI to work with gced stores. (#1919, @icristescu)

3.4.1 (2022-09-07)

Added

• irmin

  • Add Storage module for creating custom storage layers (#2047, @metanivek)

• irmin-pack

  • Add Gc.is_allowed (#2076, @icristescu)
  • Add a weight parameter in the LRU implementation to bound memory usage (#2050, @samoht)

Changed

• irmin
  • Removed Irmin_unix.set_listen_dir_hook (#2071, @zshipko)

Fixed

• irmin-pack
  • Fix the behaviour of irmin-pack regarding hashes and keys to GCed objects. It used to not correctly ignore these entries, which could have resulted in various bugs. E.g. the impossibility to append an object that used to be dead and that has its hash in index. (#2070, @Ngoguey42)

3.4.0 (2022-08-25)

Added

• irmin

  • Add Tree.seq to Tree's public API (#1923, @metanivek)

• irmin-fs

  • Add unix subpackage, irmin-fs.unix (#1948, @metanivek)

• irmin-git

  • Add unix subpackage, irmin-git.unix (#1948, @metanivek)

• irmin-graphql

  • Add unix subpackage, irmin-graphql.unix (#1948, @metanivek)

• irmin-http

  • Add unix subpackage, irmin-http.unix (#1948, @metanivek)

• irmin-cli

  • Add new package for irmin command-line tool (#1951, @metanivek)

• irmin-pack

  • Add a garbage collection feature, allowing a user to discard commits older than a specified commit. This feature is only enabled for stores that use Indexing_strategy.minimal. The primary API is Store.Gc.run, Store.Gc.wait, and Store.Gc.is_finished. See examples/gc.ml for a demonstration of usage.
  • Add a consistency check for the files on disk when opening store (#2004, @icristescu)

Changed

• irmin

  • Replaced Tree.node_fn type with more general Tree.folder type to represent the different ways to use Tree.fold (#1918, @metanivek)

• irmin-unix

  • Removed the irmin-unix package. Unix backends are now subpackages of their relevant backend (see irmin-fs.unix and irmin-git.unix). The CLI tool is in irmin-cli. For common unix utilities, see irmin.unix. (#1953, @metanivek)

• irmin-graphql

  • Updated to graphql.0.14.0 (#1843, @patricoferris, @zshipko)

Fixed

• irmin
  • Fix a bug in Irmin.LRU.clear that disables the cache completly after a clear. This is not used in any production code as only the GC is clearing LRU so far (#1998, @samoht)

3.3.2 (2022-07-25)

Fixed

• Add a consistency check for the files on disk when opening store (#2004, #2007, #@icristescu)
• Fix irmin-tezos CLI and ./tezos-node storage to work with v2 inodes (#1903, @icristescu, @Ngoguey42)

3.3.1 (2022-06-22)

Fixed

• irmin-pack
  • Fix topology irregularities on disk which may lead to post-gc crashes. (#1925, @Ngoguey42, @icristescu)

3.3.0 (2022-06-20)

Added

• irmin

  • Add Metrics module to describe metric gathering in irmin. (#1817, @maiste)
  • Add Repo.config to access config used to create repo (#1886, @zshipko)

• irmin-unix

  • Add --plugin flag to load Dynlink plugins that can register new contents, hash and store types (#1808, @zshipko)

• irmin-pack

  • Add use_fsync, dict_auto_flush_threshold and
  • suffix_auto_flush_threshold in store configuration. (#1865, @Ngoguey42)
  • Add no_migrate in store configuration. (#1893, @zshipko)

Changed

• irmin-pack
  • Move Irmin_pack.Pack_store.Indexing_strategy to Irmin_pack.Indexing_strategy and the rest of Pack_store to Irmin_pack_unix (#1833, @Ngoguey42)
  • Different repos opened using the same store module no longer share caches and file descriptors (#1852, @Ngoguey42)
  • Snapshot.Import.close requires a repo as additional argument (#1872, @icristescu)
  • Upgraded on-disk format to version 3 to support better synchronisation mechanism between readwrite and readonly instances. This change is not backwards-compatible with existing stores using irmin-pack.x.x < 3.3.0 versions. A migration done by the readwrite instance is necessary to open older stores with irmin-pack.3.3.0. It is not forwards compatible. (#1865)
  • Rename Store.sync to Store.reload (#1900, @Ngoguey42).
  • Add Pack_error exception that centralizes many error cases alongside RO_not_allowed and Unix.Unix_error (#1899, @Ngoguey42)

Fixed

• irmin-pack

  • Allow snapshot export to work on indexed root nodes (#1845, @icristescu)

• irmin

  • Fix Tree.export for nodes exported twice using different repos. (#1795, @Ngoguey42)

3.2.1 (2022-04-07)

• Support all version of cmdliner (#1803, @samoht)

3.2.0 (2022-03-28)

Added

• irmin-pack
  • Add forbid_empty_dir_persistence in store configuration. (#1789, @ngoguey42)
  • Add Store.Snapshot to expose the inodes for tezos snapshots (#1757, @icristescu).

Changed

• irmin
  • Add error types in the API or proof verifiers. (#1791, @icristescu)
  • Reduced the memory footprint of Tree.fold ~uniq:`True by a factor of 2. (#1770, @CraigFe)
  • Remove clear from all content addresssable stores. (#1794, @icristescu)

3.1.0 (2022-02-25)

Fixed

• irmin-pack

  • Drop unnecessary runtime dependency on ppx_irmin. (#1782, @hhugo)
  • Split the unix part of irmin-pack into irmin-pack.unix (#1783, @hhugo)

• irmin-unix

  • Fix conflicting command line arguments for push, pull, fetch and clone (#1776, @zshipko)
  • Fix issues with Sync functions by provided a better default Mimic.ctx. A side-effect of this update is that the remote function now returns an Lwt promise. (#1778, @zshipko)

Added

• libirmin
  • Create libirmin package providing a C interface to the irmin API (#1713, @zshipko)

Changed

• irmin-bench
  • Make trace replay API public and simpler (#1781, @Ngoguey42)

3.0.0 (2022-02-11)

Fixed

• irmin

  • Fix the implementation of comparison on Irmin.Tree objects to use the comparison defined on hashes. The previous implementation was unstable. (#1519, @CraigFe)
  • Default implementation for contents, nodes and commits can no longer trigger pre_hash collisions. This changes their hash. (#1715, @Ngoguey42, @icristescu)

• irmin-pack

  • Improve the performance of Index encode and decode operations by eliminating intermediate allocations. (#1577, @CraigFe)

• irmin-unix

  • Fix terms that can be manipulated at runtime by delaying computation (#1645, @zshipko)

Added

• irmin

  • Add Read_only.S and Read_only.Maker module types (#1343, @samoht)
  • Append-only and content-addressable backend implementations have to provide close and batch functions (#1345, @samoht)
  • Atomic-write backend implementations have to provide a close function (#1345, @samoht)
  • Add a function Store.Tree.singleton for building trees with a single contents binding. (#1567, @CraigFe)
  • Add with_handler and head to Store.Backend.Node and Store.Backend.Node_portableto work with recursive node structures from irmin core. (#1712, #1746 @Ngoguey42). Forward port of #1692 and #1670.
  • Add proof, to_proof and of_proof to Store.Backend.Node_portable (#1716, @Ngoguey42). Forward port from #1583.
  • Add hash_exn to Store.Backend.Node.Val and Store.Backend.Node_portable (#TODO, @Ngoguey42) Forward ported from #1741.
  • Add a Store.Tree.kinded_hash function. (#1767, @Ngoguey) Forward ported from #1625.
  • Add Contents.String_v2, Node.Generic_key.Make_v2 and Commit.Generic_key.Make_v2 for backward compatibility with older stores. (#1715, @icristescu)

• irmin-bench

  • Many improvements to the actions trace replay:
    • Support for the layered store (#1293, @Ngoguey42)
    • Fix replay for the first ~650k commits (was ~13k) (#1314, @Ngoguey42)
    • Can change inode configuration prior to replay (#1326, @Ngoguey42)
    • Check hash of commits (#1328, @icristescu)
    • Fix the path flattening technique (#1357, @Ngoguey42)
    • Introduce a new actions trace that can support replaying up to ~1300k commits. (#1358, @Ngoguey42)
    • Improve the stats collection and stats report (#1367, #1384, #1403, #1404, #1416, #1429, #1438, #1501, #1616, @Ngoguey42, @maiste)
    • Enable replay in CI (#1430, @Ngoguey42)
    • Enable replay in CB (#1441, @Ngoguey42)

• irmin-mem

  • Add Irmin_mem.Content_addressable (#1369, @samoht)

• irmin-pack

  • Add a stat-store command to irmin-fsck to output stats on the tree under a specified commit (#1391, @icristescu, @Ngoguey42, @CraigFe).
  • Add new counters in Stats (#1570, @Ngoguey42).
  • Add an option to configure the index function and pick the relevant bits in a cryptographic hash by default (#1677 #1699, @samoht)
  • Verify inode depth invariants (#1711, @Ngoguey42). Forward port of #1665.

• irmin-unix

  • Update irmin CLI to raise an exception when an invalid/non-existent config file is specified (#1413, @zshipko)
  • Add --commit flag to CLI to load a store from a specific commit hash (#1721, @zshipko)

• irmin-tezos

  • Add a new package to mirror Tezos tezos-context.encoding library. That'll simplify building benchmarks and custom tools (#1579, @samoht)

Changed

• irmin

  • Irmin.Sync is now a namespace: use Irmin.Sync.Make(S) instead of Irmin.Sync(S) (#1338, @samoht)

  • Irmin.Private is now Irmin.Backend (#1530, @CraigFe)

  • Store.master is now Store.main. The existing Store.master function is deprecated and will be removed in a future release. (#1564, @CraigFe)

  • Store.Private is now Store.Backend (#1530, @CraigFe)

  • Store.Private.Sync is now Store.Backend.Remote (#1338, @samoht)

  • Irmin.Branch.S.master is now Irmin.Branch.S.main (#1564, @CraigFe)

  • Irmin.Private.{Commit,Node} are now Irmin.{Node,Commit}. (#1471, @CraigFe)

  • All module types are now using snake-case and are not capitalized anymore. (#1341, @samoht)

  • Move signatures for backend stores into their own modules. All the X_STORE sigs have moved to X.S:

    • APPEND_ONLY_STORE is now Append_only.S
    • CONTENT_ADDRESSABLE_STORE is now Content_addressable.S
    • ATOMIC_WRITE_STORE is now Irmin.Atomic_write.S And all the X_STORE_MAKER have moved to X.Maker:
    • APPEND_ONLY_STORE_MAKER is now Append_only.Maker
    • CONTENT_ADDRESSABLE_STORE_MAKER is now Content_addressable.Maker
    • ATOMIC_WRITE_STORE_MAKER is now Atomic_write.Maker This gives some space to move convenient functors closer to where they belong:
    • Content_addressable is now Content_addressable.Make
    • New Content_adddressable.Check_closed and Atomic_write.Check_closed (#1342, @samoht)

  • Rename Irmin.Make into Irmin.Maker ; stage its result to return Make functor once provided with a content-addressable and an atomic-writes stores (#1369, @samoht)

  • Rename Irmin.Make_ext into Irmin.Maker_ext ; stage its result to return Make functor once provided with a content-addressable and an atomic-writes stores, as well as node and commit makers (#1369, @samoht)

  • Require at least lwt.5.3.0 to use Lwt.Syntax in the codebase (#1401, @samoht)

  • Info implementations are not part of store: use S.Info.v instead of Irmin.Info.v (#1400, @samoht)

  • Rename Commit.V1 to Commit.V1.Make. This functor now takes separate hash and key implementations as arguments. (#1431 #1634, @CraigFe @icristescu)

  • Introduce a Schema module to hold all the types that users can define in an Irmin store. Use this as a parameter to every Maker functor. This is a large change which touches all the backends. (#1470, @samoht, @CraigFe)

  • Add Irmin.Backend.Conf.Schema for grouping configuration keys. Now Irmin.Backend.Conf.key takes an additional ~spec parameter. (#1492, @zshipko)

  • Tree.empty and Node.empty now both take a unit argument. (#1566 #1629, @CraigFe)

  • Rename key type to path and Key module to Path when it is in a path context in Tree and Store. (#1569, @maiste)

  • Move Node.default metadata default values into a Node.Metadata.default to give room for other metadata values (#1611, @samoht)

  • Add support for non-content-addressed ("generic key") backend stores. This allows Irmin to work with backends in which not all values are addressed by their hash. In particular, this includes:

    • New functions: Store.{Commit,Contents,Tree}.of_key.
    • Adds Irmin.{Node,Commit}.Generic_key modules.
    • Adds new types that must be provided by backends: Node.Portable and Commit.Portable.
    • Adds a new type of backend store: Irmin.Indexable.S. (#1510 #1647, @CraigFe)

  • Cache hits in several Tree functions are more frequent than before. (#1724, @Ngoguey42, @CraigFe)

  • Add a new Pruned_hash tag to the error case of several Store.Tree functions (#1744 @Ngoguey42). Forward ported from #1583.

• irmin-containers

  • Removed Irmin_containers.Store_maker; this is now equivalent to Irmin.Content_addressable.S (#1369, @samoht)
  • Renamed Irmin_containers.CAS_maker to Irmin_containers.Content_addressable (#1369, @samoht)

• irmin-fs

  • Renamed Irmin_fs.Make into Irmin_fs.Maker (#1369, @samoht)
  • Renamed Irmin_fs.Make_ext into Irmin_fs.Maker_ext (#1369, @samoht)

• irmin-git

  • All of the configuration keys have moved into their own namespace:
    • Irmin_git.root is now Irmin_git.Conf.root
    • Irmin_git.head is now Irmin_git.Conf.head
    • Irmin_git.bare is now Irmin_git.Conf.bare
    • Irmin_git.level is now Irmin_git.Conf.level
    • Irmin_git.buffers is now Irmin_git.Conf.buffers
    • Irmin_git.dot_git is now Irmin_git.Conf.dot_git (#1347, @samoht)
  • Renamed Irmin_git.Make into Irmin_git.Maker (#1369, @samoht)
  • Require at least git.3.7.0 in the codebase (#1632, @dinosaure)

• irmin-graphql:

  • Changed the name of the default branch node from master to main in the GraphQL API. (#1564, @CraigFe)
  • Updated to be compatible with generic keys.
    • The Key type is now called Path to match the new name in irmin
    • All key fields and parameters have been renamed to path (#1618, @zshipko)

• irmin-mirage

  • Renamed Irmin_mirage_git.Make into Irmin_mirage_git.Maker (#1369, @samoht)

• irmin-pack

  • Changed the implementation of backend store keys to use direct pointers to store contents (by offset in the pack file) when possible, rather than querying the index on each lookup. (#1659, @CraigFe @ngoguey42 @icristescu)
  • The Irmin_pack.Maker module type now no longer takes a Conf argument. (#1641, @CraigFe)
  • The backend configuration type Conf.S requires a new parameter contents_length_header that (optionally) further specifies the encoding format used for commits in order to improve performance. (#1644, @CraigFe)
  • Upgraded on-disk format of pack files to support more efficient lookups and reduce indexing overhead. This change is fully backwards-compatible with existing stores using irmin-pack.2.x versions, but not forwards compatible. (#1649 #1655, @CraigFe @Ngoguey42)
  • Added support for user-specified indexing strategies. The default strategy is to index all objects appended to the pack file (as before), but users may now choose to index fewer objects in order to improve the write performance of the store, at the cost of introducing potential duplicate values to the pack file. (#1664, #1761, @CraigFe, @maiste)

• irmin-unix

  • Clean up command line interface. Allow config file to be specified when using Irmin_unix.Resolver.load_config and make command line options take precedence over config options. (#1464, #1543, #1607 @zshipko)
  • Irmin_unix.Resolver.destruct has been removed (and partially replaced by Resolver.spec). (#1603, @CraigFe)
  • Update irmin CLI to support empty path in list subcommand. (#1575, @maiste)
  • Add new commands to CLI: branches for listing available branches and log which is similar to git log (#1609, #1727, @zshipko)
  • Update irmin watch to take parameters to specify a command that should be executed when there are new changes (#1608, @zshipko)

Removed

• irmin-pack

  • Removed the irmin-pack.layered library. Support for the layered store will be restored on a future release of irmin-pack. (#1651, @CraigFe)
  • Removed support for the clear operation in irmin-pack. This operation is incompatible with performance optimisations made in this release. (#1655, @CraigFe)

• irmin-layers

  • This experimental package has been removed.

2.10.2 (2022-02-02)

Fixed

• irmin

  • Fixed a bug causing stream proof extender nodes to have their segments be returned in reverse order (i.e. bottom to top, rather then top-down). (#1742, @CraigFe)

  • Fixed a bug that allowed the creation of overly-large stable inodes via stream proofs. (#1741, @Ngoguey42)

Added

• irmin
  • Add Store.Private.Node.Val.hash_exn (#1741, @Ngoguey42)

2.10.1 (2022-01-20)

Fixed

• irmin
  • Fix bug introduced in #1683 which causes Tree.seq and Tree.list to produce pruned children (#1720, @Ngoguey42)

2.10.0 (2022-01-07)

Fixed

• irmin

  • Conversion between proofs and trees are now done in CPS (#1624, @samoht)
  • Better support for s390x to workaround ocaml/ocaml#10857 (#1694, @icristescu)

• irmin-pack

  • Fix proofs for large inodes by tracking side-effects reads inside the inode implementation (#1670, @samoht, @Ngoguey42)
  • Flush branch store without calling Repo.close (#1707, @zshipko)

Added

• irmin

  • Add Tree.produce_proof and Tree.verify_proof to produce and verify proofs from complex computations. produce_proof and verify_proof takes a callback over tree and instead of a static list of operations -- this now means that the full Tree API can now be used in proofs, including sub-tree operations, folds and paginated lists (#1625, #1663, #1683, @samoht, @Ngoguey42)
  • Add Tree.produce_stream and Tree.verify_stream to produce and verify stream proofs (#1684, #1692, #1691, @samoht, @Ngoguey42, @icristescu)

• irmin-pack

  • Verify inode depth invariants (#1665, @samoht)

• irmin-unix

  • Add tezos store type for irmin command-line (#1678, @zshipko)

Changed

• irmin

  • Remove Tree.Proof.of_keys. Use Tree.produce_proof instead (#1625, @samoht)
  • Tree.empty now takes a unit argument. (#1566, @CraigFe)
  • Tree.length now takes a tree as argument (#1676, @samoht)
  • Tree.Proof.t now uses a more precise datatype to encode value invariants (#1688, @samoht)

• irmin-pack

  • irmin-pack: add an option to configure the index function and pick the relevant bits in cryptographic a hash by default (#1677, @samoht)

• irmin-git

  • Require at least git.3.7.0 in the codebase (#1637, @dinosaure)

2.9.1 (2022-01-10)

Fixed

• irmin
  • Better support for s390x to workaround ocaml/ocaml#10857 (#1694, @icristescu)

2.9.0 (2021-11-15)

Fixed

• irmin-pack
  • Improved the performance of Index encode and decode operations by eliminating intermediate allocations (up to 5% fewer minor words allocated) (#1577, @CraigFe)
  • Reduce the number of backend nodes built during export (up to 20% fewer minor words allocated) (#1553, @Ngoguey42)

Added

• irmin
  • Add Merkle Proofs and expose function to convert a proof to and from a tree. Once converted, normal tree operations can be performed on the proof, as long at it access values contained in the proof. (#1583, @samoht, @Ngoguey42, @icristescu)

Changed

• irmin-pack
  • Limit inode depth (#1596, #samoht)
  • Adapt to index 1.5.0 (#1593, @icristescu)

2.8.0 (2021-10-15)

Fixed

• irmin
  • Tree operations now raise a Dangling_hash exception when called with a path that contains dangling hashes in the underlying store, rather than interpreting such paths as ending with empty nodes (#1477, @CraigFe)
  • Fix the pre-hashing function for big-endian architectures. (#1505, @Ngoguey42, @dinosaure)
  • Fix a bug in Tree.export where nodes could be exported before some of their contents, resulting in indirect hashes in irmin-pack (#1508, @Ngoguey42)

Added

• irmin
  • Node.seq and Node.of_seq are added to avoid allocating intermediate lists when it is not necessary (#1508, @samoht)
  • New optional cache parameter to Tree.hash, Tree.Contents.hash, Tree.list, Node.list, Node.seq and Node.find to control the storing of lazily loaded data (#1526, @Ngoguey42)
  • Add Node.clear to clear internal caches (#1526, @Ngoguey42)
  • Added a tree argument to Tree.fold to manipulate the subtrees (#1527, @icristescu, @Ngoguey42)
  • Add a function Store.Tree.pruned for building purely in-memory tree objects with known hashes. (#1537, @CraigFe)
  • Added a order argument to specify the order of traversal in Tree.fold (#1548, @icristescu, @CraigFe)

Changed

• irmin

  • Node.v is renamed to Node.of_list (#1508, @samoht)
  • Rewrite Tree.export in order to minimise the memory footprint. (#1508, @Ngoguey42)
  • Remove the ~force:`And_clear case parameter from Tree.fold, ~force:`True ~cache:false is the new equivalent. (#1526, @Ngoguey42)
  • `Tree.fold ~force:`True and `Tree.fold ~force:`False don't cache the lazily loaded data any more. Pass ~cache:true to enable it again. (#1526, @Ngoguey42)
  • Do not allocate large lists in Irmin.Tree.clear (#1515, @samoht)

• irmin-git

  • Upgrade irmin-git to git.3.5.0. (#1495, @dinosaure)

2.7.2 (2021-07-20)

Added

• irmin-pack
  • Added integrity-check-index command in irmin-fsck. (#1480, #1487 @icristescu, @samoht)

Changed

• irmin-pack
  • reconstruct_index is now traverse_pack_file, it allows for both index reconstruction and index checking (#1478, @Ngoguey42)

2.7.1 (2021-07-02)

Fixed

• irmin-pack
  • Fix termination condition of reconstruct index (#1468, @Ngoguey42)

2.7.0 (2021-06-22)

Fixed

• irmin

  • Added Store.Tree.length. (#1316, @Ngoguey42)
  • Fixed fold for non-persisted, cleared trees (#1442, @samoht, @Ngoguey42)

• irmin-layers

  • Do not fail on double-close errors for private nodes (#1421, @samoht)

• irmin-pack

  • Do not clear and bump the generation for empty files (#1420, @samoht)

Added

• irmin-pack

  • Added Irmin_pack.Version.{V1,V2} modules for convenience. (#1457, @CraigFe)
  • Added a irmin-pack.mem package (#1436, @icristescu, @craigfe)

• irmin-graphql

  • Added last_modified field to GraphQL interface (#1393, @kluvin)

Changed

• irmin-layers

  • Remove copy_in_upper from the repo configuration. The default is now to copy. (#1322, @Ngoguey42)
  • Simplify the API of freeze. It is now possible to specify two distinct commit closures for the copy to lower and the copy to next upper. (#1322, @Ngoguey42)
  • Renamed Irmin_layered_pack.Make and Irmin_layers.MakeintoIrmin_layered_pack.MakerandIrmin_layers.Maker` (#1369, @samoht)
  • Renamed Irmin_layered_pack.Make_ext and and Irmin_layers.Make_extinto intoIrmin_layered_pack.Maker_extandIrmin_layers.Maker_ext` (#1369, @samoht)
  • Renamed Irmin_layered_pack.Config into Irmin_layered_pack.Conf (#1370, @samoht)
  • Readonly instances can check for an ongoing freeze (#1382, @icristescu, @Ngoguey42)

• irmin-pack

  • It is no longer possible to modify an inode that doesn't point to the root of a directory. (#1292, @Ngoguey42)
  • When configuring a store, is it no longer possible to set entries to a value larger than stable_hash. (#1292, @Ngoguey42)
  • Added number of objects to the output of stat-pack command in irmin-fsck. (#1311, @icristescu)
  • Renamed the Version module type into Version.S and io_version into version. The Pack.File and Atomic_write functors now take Version as their first parameter (#1352, @samoht)
  • Renamed Irmin_pack.Make into Irmin_pack.V1 (#1369, @samoht)
  • Renamed Irmin_pack.Config into Irmin_pack.Conf (#1370, @samoht)
  • Renamed Irmin_pack.Pack into Irmin_pack.Content_addressable and Irmin_pack.Pack.File into Irmin_pack.Content_addressable.Maker (#1377, @samoht)
  • Moved Irmin_pack.Store.Atomic_write into its own module (#1378, @samoht)
  • Checks.Reconstruct_index.run now takes an optional index_log_size parameter for customising the interval between merges during reconstruction. (#1459, @CraigFe)

2.6.1 (2021-04-29)

This release contains 2.6.0 plus the changes described in 2.5.4.

2.6.0 (2021-04-13)

** Note: this release is based on 2.5.3, and does not contain 2.5.4. Use 2.6.1 for access to those changes. **

Fixed

• irmin

  • Fix stack overflow exception when working with wide trees (#1313, @zshipko)

  • Tree.of_concrete now prunes empty subdirectories, and raises Invalid_argument if the input contains duplicate bindings. (#1385, @CraigFe)

• irmin-chunk

  • Use the pre_hash function to compute entry keys instead of their raw binary representation (#1308, @samoht)

Changed

• irmin-git
  • Upgrade irmin-git with git.3.4.0. (#1392, @dinosaure)

2.5.4 (2021-04-28)

Fixed

• irmin-pack

  • Revert a patch introduced in 2.3.0 which was calling Index.try_merge. This function was supposed to hint index to schedule merges after every commit. However, Index.try_merge is buggy and stacks merges which causes the node to block and wait for any existing merge to complete. We will revisit that feature in future once we fix Index.try_merge (#1409, @CraigFe)

• irmin

  • Fix peformance issue in Tree.update_tree and Tree.add_tree for large directories (#1315, @Ngoguey42)

Added

• irmin-pack
  • Expose internal inode trees (#1273, @mattiasdrp, @samoht)

2.5.3 (2021-04-13)

Fixed

• irmin
  • Fixed a bug causing equality functions derived from Store.tree_t to return false-negatives. (#1371, @CraigFe)

Added

• irmin
  • Added Store.Tree.is_empty. (#1373, @CraigFe)

2.5.2 (2021-04-08)

Fixed

• irmin

  • The Tree.update_tree and Tree.add_tree functions now interpret adding an empty subtree as a remove operation, rather than adding an empty directory. (#1335, @craigfe)

• irmin-pack

  • Fixed a performance regression where all caches were always cleaned by Store.sync when using the V1 format (#1360, @samoht)

2.5.1 (2021-02-19)

• irmin-git
  • Use the last version of git 3.3.0. It fixes a bug about trailing LF on message. For Irmin users, it should not change anything (#1301, @dinosaure, @CraigFe)

2.5.0 (2021-02-16)

Changed

• irmin

  • Store.Tree.remove is now much faster when operating on large directories. The commits following removals are also much faster. (#1289, @Ngoguey42)

  • Changed Store.Tree.{of_hash, shallow} to take kinded hashes, allowing the creation of unforced contents values. (#1285, @CraigFe)

  • Changed Tree.destruct to return lazy contents values, which may be forced with Tree.Contents.force. (#1285, @CraigFe)

• irmin-bench

  • New features in benchmarks for tree operations (#1269, @Ngoguey42)

2.4.0 (2021-02-02)

Fixed

• irmin-pack

  • Fix a bug in inode where the remove function could cause hashing instabilities. No user-facing change since this function is not being used yet. (#1247, @Ngoguey42, @icristescu)

• irmin

  • Ensure that Tree.add_tree t k v complexity does not depend on v size. (#1267, @samoht @Ngoguey42 and @CraigFe)

Added

• irmin

  • Added a Perms module containing helper types for using phantom-typed capabilities as used by the store backends. (#1262, @CraigFe)

  • Added an Exported_for_stores module containing miscellaneous helper types for building backends. (#1262, @CraigFe)

  • Added new operations Tree.update and Tree.update_tree for efficient read-and-set on trees. (#1274, @CraigFe)

• irmin-pack:

  • Added integrity-check-inodes command to irmin-fsck for checking the integrity of inodes. (#1253, @icristescu, @Ngoguey42)

• irmin-bench

  • Added benchmarks for tree operations. (#1237, @icristescu, @Ngoguey42, @Craigfe)

Changed

• The irmin-mem package is now included with the irmin package under the library name irmin.mem. It keeps the same top-level module name of Irmin_mem. (#1276, @CraigFe)

Removed

• Irmin_mem no longer provides the layered in-memory store Make_layered. This can be constructed manually via Irmin_layers.Make. (#1276, @CraigFe)

2.3.0 (2021-01-12)

Fixed

• irmin-git

  • Update irmin to the last version of ocaml-git (#1065) It fixes an issue on serialization/deserialization of big tree object (see #1001)

• irmin-pack*

  • Fix a major bug in the LRU which was never used (#1035, @samoht)

• irmin*

  • Improve performance of last_modified (#948, @pascutto)

  • Changed the pattern matching of the function last_modified. The case of a created key is now considered a modification by the function. (#1167, @clecat)

  • Make Tree.clear tail-recursive (#1171, @samoht)

  • Fix Tree.fold ~force:(False f) where results where partially skipped (#1174, @Ngoguey42, @samoht and @CraigFe )

  • Fix Tree.kind. Empty path on a tree used to return a None instead of a `Node. (#1218, @Ngoguey42)

• ppx_irmin

  • Fix a bug causing certain type derivations to be incorrect due to unsound namespacing. (#1083, @CraigFe)

• irmin-unix

  • Update irmin config path to respect XDG_CONFIG_HOME. (#1168, @zshipko)

Added

• irmin-layers (new):

  • Created a new package, irmin-layers that includes common signatures for layered stores. It contains a stub Make_layers functor (#882, @icristescu)

• irmin-bench (new):

  • Created a new package to contain benchmarks for Irmin and its various backends. (#1142, @CraigFe)
  • Added ability to get json output and a make target to run layers benchmark. (#1146, @gs0510)

• irmin

  • Added Tree.Contents module exposing operations over lazy tree contents. (#1022 #1241, @CraigFe @samoht)

  • Added Type.Unboxed.{encode_bin,decode_bin,size_of} to work with unboxed values (#1030, @samoht)

  • Remove the headers option in Type.{encode_bin,decode_bin,size_of}. Use Type.Unboxed.<fn> instead (#1030, @samoht)

  • Type.v now takes an extra mandatory unit argument (#1030, @samoht)

  • Added Type.pp_dump, which provides a way to pretty-print values with a syntax almost identical to native OCaml syntax, so that they can easily be copy-pasted into an OCaml REPL for inspection. (#1046, @liautaud)

  • Generic functions in Irmin.Type are now more efficient when a partial closure is constructed to the type representation (#1030 #1093, @samoht @CraigFe). To make this even more explicit, these functions are now staged and Type.{unstage,stage} can manipulate these. The goal is to encourage users to write this kind of (efficent) pattern:

    let encode_bin = Type.(unstage (encode_bin ty))
    let _ = <begin loop> ... encode_bin foo ... <end loop>

  • Added a clear function for stores (#1071, @icristescu, @CraigFe)

  • Requires digestif>=0.9 to use digestif's default variants (#873, @pascutto, @samoht)

  • Added iter_commits and iter_nodes functions to traverse the commits and nodes graphs (#1077, @icristescu)

  • Added Repo.iter to traverse object graphs (#1128, @samoht)

• irmin-pack:

  • Added index_throttle option to Irmin_pack.config, which exposes the memory throttle feature of Index in Irmin-Pack. (#1049, @icristescu)

  • Added Pack.clear and Dict.clear (#1047, @icristescu, @CraigFe, @samoht)

  • Added a migrate function for upgrading stores with old formats (#1070, @icristescu, @CraigFe)

  • Added a flush function for a repo (#1092, @icristescu)

  • Added `Layered.Make functor, to construct layered stores from irmin-pack. (#882, @icristescu)

  • Added `Checks.Make which provides some offline checks for irmin-pack stores. (#1117, @icristescu, @CraigFe)

  • Added reconstruct_index to reconstruct an index from a pack file. (#1097, @icristescu)

  • Added reconstruct-index command to irmin-fsck for reconstructing an index from the command line (#1189, @zshipko)

  • Added integrity-check command to irmin-fsck for checking the integrity of an irmin-pack store (#1196, @zshipko)

• ppx_irmin:

  • Added support for deriving type representations for types with type parameters. Type 'a t generates a representation of type 'a Type.t -> 'a t Type.t (#1085, @CraigFe)

  • Added a --lib command-line option which has the same behaviour as the lib run-time argument (i.e. --lib Foo will cause ppx_irmin to derive type representations using combinators in the Foo module). (#1086, @CraigFe)

  • Added an extension point [typ: <core-type>] for deriving type representations inline. (#1087, @CraigFe)

Changed

• irmin

  • Renamed the Tree.tree type to Tree.t. (#1022, @CraigFe)

  • Replaced Tree.pp_stats with the type representation Tree.stats_t. (#TODO, @CraigFe)

  • Changed the JSON encoding of special floats. Float.nan, Float.infinity and Float.neg_infinity are now encoded as "nan", "inf" and "-inf" respectively. (#979, @liautaud)

  • The functions Type.{v,like,map} no longer take a ~cli argument, and now take separate ~pp and ~of_string arguments instead. (#1103, @CraigFe)

  • The Irmin.Type combinators are now supplied by the repr package. The API of Irmin.Type is not changed. (#1106, @CraigFe)

  • Irmin.Type uses staging for equal, short_hash and compare to speed-up generic operations (#1130, #1131, #1132, @samoht)

  • Make Tree.fold more expressive and ensure it uses a bounded memory (#1169, @samoht)

  • Changed list and Tree.list to take optional offset and length arguments to help with pagination. Also return direct pointers to the subtrees to speed up subsequent accesses (#1241, @samoht, @zshipko, @CraigFe, @Ngoguey42 and @icristescu)

• irmin-pack:

  • sync has to be called by the read-only instance to synchronise with the files on disk. (#1008, @icristescu)

  • Renamed sync to flush for the operation that flushes to disk all buffers of a read-write instance. (#1008, @icristescu)

  • Changed the format of headers for the files on disk to include a generation number. Version 1 of irmin-pack was used for the previous format, version 2 is used with the new format. (#1047, @icristescu, @CraigFe, @samoht)

  • Use Repo.iter to speed-up copies between layers (#1149, #1150 @samoht)

  • Add an option to bypass data integrity checks on reads (#1154, @samoht)

  • Add heads parameter to check-self-contained command in Checks (#1224, @zshipko)

• ppx_irmin:

  • The [@generic ...] attribute has been renamed to [@repr ...]. (#1082, @CraigFe)

2.2.0 (2020-06-26)

Added

• irmin:

  • Added Irmin.Type.empty to represent an uninhabited type. (#961, @CraigFe)
  • Added Store.Tree.concrete_t. (#1003, @CraigFe)

• irmin-containers (new):

  • Created a new package, irmin-containers, which provides a set of simple mergeable datastructures implemented using Irmin. (#1014, @ani003)

• ppx_irmin

  • Added support for the @nobuiltin attribute, which can be used when shadowing primitive types such as unit. See README_PPX for details. (#993, @CraigFe)

  • Added support for a lib argument, which can be used to supply primitive type representations from modules other than Irmin.Type. (#994, @CraigFe)

Changed

• irmin:

  • Require OCaml 4.07 (#961, @CraigFe)

  • Add sanity checks when creating Irmin.Type records, variants and enums (#956 and #966, @liautaud):

    • Irmin.Type.{sealr,sealv,enum} will now raise Invalid_argument if two components have the same name;
    • Irmin.Type.{field,case0,case1} will now raise Invalid_argument if the component name is not a valid UTF-8 string.

  • Changed the JSON encoding of options and unit to avoid ambiguous cases (#967, @liautaud):

    • () is now encoded as {};
    • None is now encoded as null;
    • Some x is now encoded as {"some": x};
    • Fields of records which have value None are still omitted;
    • Fields of records which have value Some x are still unboxed into x.

  • Changed pretty-printing of Irmin types to more closely resemble OCaml types. e.g. pair int string prints as int * string. (#997, @CraigFe)

  • The type Irmin.S.tree is now abstract. The previous form can be coerced to/from the abstract representation with the new functions Irmin.S.Tree.{v,destruct} respectively. (#990, @CraigFe)

• irmin-mem

  • Stores created with KV now expose their unit metadata type. (#995, @CraigFe)

Fixed

• irmin-graphql
  • Fixed an issue with keys inside get_{contents,tree} fields having incorrect ordering (#989, @CraigFe)

2.1.0 (2020-02-01)

Added

• ppx_irmin (new):

  • Created a new package, ppx_irmin, which provides a PPX deriving plugin for generating Irmin generics.

• irmin-unix:

  • Added a --hash parameter to the command-line interface, allowing the hash function to be specified. For BLAKE2b and BLAKE2s, the bit-length may be specified with a trailing slash, as in --hash=blake2b/16. The hash function may also be specified in the configuration file. (#898, @craigfe)

• irmin:

  • Added Irmin.Hash.Make_BLAKE2B and Irmin.Hash.Make_BLAKE2S functors for customizing the bit-length of these hash functions. (#898, @craigfe)
  • Added iter function over a closure graph (#912, @ioana)
  • Added Type.pp_ty for pretty-printing Irmin generics. (#926, @craigfe)
  • Added Merge.with_conflict for modifying the conflict error message of a merge function. (#926, @craigfe)

Changed

• irmin-pack:

  • Changed the bit-length of serialized hashes from 60 to 30. (#897, @icristescu)
  • integrity_check can now try to repair corrupted values. (#947, @pascutto)

• irmin-graphql:

  • Changed default GraphQL type names to ensure uniqueness. (#944, @andreas)

2.0.0

Added

• irmin-pack (new):

  • Created a new Irmin backend, irmin-pack, which uses a space-optimised on-disk format.

• irmin-graphql (new):

  • Created a new package, irmin-graphql, which provides a GraphQL server implementation that can be used with both the MirageOS and Unix backends. Additionally, a graphql command has been added to the command-line interface for starting irmin-graphql servers. (#558, @andreas, @zshipko)

  • Contents can now be queried directly using irmin-graphql with Irmin_graphql.Server.Make_ext and the Irmin_graphql.Server.PRESENTER interface. (#643, @andreas)

• irmin-test (new):

  • Added a new package, irmin-test, which allows for packages to access the Irmin test-suite. This package can now be used for new packages that implement custom backends to test their implementations against the same tests that the core backends are tested against. (#508, @zshipko)

• irmin-unix:

  • Add Cli module to expose some methods to simplify building command-line interfaces using Irmin. (#517, @zshipko)

  • Add global config file $HOME/.irmin/config.yml which may be overridden by either $PWD/.irmin.yml or by passing --config <PATH>. See irmin help irmin.yml for details. (#513, @zshipko)

• irmin-git:

  • Allow import/export of Git repositories using Irmin slices. (#561, @samoht)

• irmin-http:

  • Expose a /trees/merge route for server-side merge operations. (#714, @samoht)

• irmin:

  • Add Json_value and Json content types. (#516 #694, @zshipko)

  • Add optional seed parameter to the Irmin.Type generic hash functions. (#712, @samoht)

  • Add V1 submodules in Commit, Contents and Hash to provide compatibility with 1.x serialisation formats. (#644 #666, @samoht)

  • Add Store.last_modified function, which provides a list of commits where the given key was modified last. (#617, @pascutto)

  • Add a Content_addressable.unsafe_add function allowing the key of the new value to be specified explicitly (for performance reasons). (#783, @samoht)

  • Add save_contents function for saving contents to the database. (#689, @samoht)

  • Add pretty-printers for the results of Sync operations. (#789, @craigfe)

  • Private.Lock now exposes a stats function returning the number of held locks. (#704, @samoht)

Changed

• irmin-unix:

  • Rename irmin read to irmin get and irmin write to irmin set. (#501, @zshipko)

  • Switch from custom configuration format to YAML. (#504, @zshipko)

• irmin-git:

  • Require ocaml-git >= 2.0. (#545, @samoht)

  • Cleanup handling of remote stores. (#552, @samoht)

• irmin-http:

  • Rename CLIENT to HTTP_CLIENT and simplify the signatures necessary to construct HTTP clients and servers. (#701, @samoht)

• irmin-mirage

  • Split irmin-mirage into irmin-{mirage,mirage-git,mirage-graphql} to allow for more granular dependency selection. Any instances of Irmin_mirage.Git should be replaced with Irmin_mirage_git. (#686, @zshipko)

• irmin:

  • Update to use dune (#534, @samoht) and opam 2.0. (#583, @samoht)

  • Replace Irmin.Contents.S0 with Irmin.Type.S.

  • Rename Type.pre_digest -> Type.pre_hash and Type.hash -> Type.short_hash. (#720, @samoht)

  • Change Irmin.Type to use incremental hash functions (functions of type 'a -> (string -> unit) -> unit) for performance reasons. (#751, @samoht)

  • Simplify the Irmin.Type.like constructor and add a new Irmin.Type.map with the previous behaviour.

  • Improvements to Irmin.Type combinators. (#550 #538 #652 #653 #655 #656 #688, @samoht)

  • Modify Store.set to return a result type and create a new Store.set_exn with the previous exception-raising behaviour. (#572, @samoht)

  • Rename store module types to be more descriptive:

    • replace Irmin.AO with Irmin.CONTENT_ADDRESSABLE_STORE;
    • replace Irmin.AO_MAKER with Irmin.CONTENT_ADDRESSABLE_STORE_MAKER;
    • replace Irmin.RW with Irmin.ATOMIC_WRITE_STORE;
    • replace Irmin.RW_MAKER with Irmin.ATOMIC_WRITE_STORE_MAKER. (#601, @samoht)

  • Rename export_tree to save_tree (#689, @samoht) and add an option to conditionally clear the tree cache (#702 #725, @samoht).

  • Change hash function for Irmin_{fs,mem,unix}.KV to BLAKE2b rather than SHA1 for security reasons. (#811, @craigfe)

  • Move Irmin.remote_uri to Store.remote, for stores that support remote operations. (#552, @samoht)

  • Simplify the error cases of fetch/pull/push operations. (#684, @zshipko)

  • A batch function has been added to the backend definition to allow for better control over how groups of operations are processed. (#609, @samoht)

  • A close function has been added to allow backends to close any held resources (e.g. file descriptors for the FS backend). (#845, @samoht)

  • Simplify Private.Node.Make parameters to use a simpler notion of 'path' in terms of a list of steps. (#645, @samoht)

  • Rename Node.update to Node.add. (#713, @samoht)

Fixed

• irmin-unix:

  • Fix parsing of commit hashes in revert command. (#496, @zshipko)

• irmin-git:

  • Fix Node.add to preserve sharing. (#802, @samoht)

• irmin-http:

  • Respond with a 404 if a non-existent resource is requested. (#706, @samoht)

• irmin:

  • Fix a bug whereby S.History.is_empty would return true for a store with exactly one commit. (#865, @pascutto)

Removed

• irmin:

  • Remove pp and of_string functions from Irmin.Contents.S in favour of Irmin.Type.to_string and Irmin.Type.of_string.

  • Remove Bytes content type. (#708, @samoht)

  • Remove Cstruct dependency and content type. If possible, switch to Irmin.Contents.String or else use Irmin.Type.map to wrap the Cstruct type. (#544, @samoht)

1.4.0 (2018-06-06)

• Add types for Contents.hash, Tree.hash and Commit.hash (#512, @samoht)
• Tree.hash and Tree.of_hash now work on leaf nodes. To do this, Tree.hash has to return a more complex type (#512, @samoht)
• support for webmachine 0.6.0 (#505, @ansiwen)

1.3.3 (2018-01-03)

• complete support for OCaml 4.06 (#484, @samoht)
• support cohttp 1.0 (#484, @samoht)

1.3.2 (2017-11-22)

• support OCaml 4.06 where -safe-string is enabled by default (#477, @djs55)

1.3.1 (2017-08-25)

• irmin-http: update to cohttp.0.99 (#467, @samoht)

1.3.0 (2017-07-27)

irmin-chunk

Add a new package: irmin-chunk, which was initially in a separate repository created by @mounirnasrallah and @samoht and ported to the new Irmin API by @g2p (#464)

irmin-unix

Re-add the irmin binary, the example application which used to be installed by irmin-unixbefore we switched to usejbuilder` (#466, @samoht -- reported by @ouenzzo and @dudelson)

irmin

That releases saw a nice series of patches to improve the performance of Irmin.Tree contributed by the Tezos team:

• Improve complexity of Irmin.Tree operations: on trivial benchmarks with a lot of values, this patch introduces a 10-times speed-up (#457, @OCamlPro-Henry)

• Add missing equality for Irmin.Type primitives (#458, @OCamlPro-Henry)

• Change the type of Hash.digest to also take a type representation (#458, @OCamlPro-Henry)

• add Irmin.Type.{encode,decode}_cstruct (#458, @OCamlPro-Henry)

• remove Irmin.Contents.RAW (#458, @OCamlPro-Henry)

• avoid unecessary serialization and deserialization when computing hashes of cstructs (#459, @OCamlPro-Henry)

• remove {Type,Merge}.int which might cause some issue on 32 bits platforms. Intead use the more explicit (and portable) {Type,Merge}.int32 or {Type,Merge}.int64 (#469, @samoht)

1.2.0 (2017-06-06)

This release changes the build system to use jbuilder. By doing so, it introduces two new packages: irmin-mem and irmin-fs -- containing Irmin_mem and Irmin_fs respectively. That release also fixes a bunch of regressions introduced in the big 1.0 rewrite.

all

• Use jbuilder (#444, @samoht)
• Use mtime 1.0 (#445, @samoht)

irmin

• Fix Irmin.Contents.Cstruct: pretty-print the raw contents, not the hexdump (#442, @samoht)
• Irmin.Hash.X.of_string should not raise an exception on invalid hash (#443, @samoht)

irmin-mem

• New package! Use it if you want to use the Irmin_mem module.

irmin-fs

• New package! Use it if you want to use the Irmin_fs module.

irmin-git

• Fix watches (#446, @samoht)

1.1.0 (2017-04-24)

irmin

• Change the type of S.Tree.find_tree to return a tree option instead of tree. This is a breaking API change but it let distinguish between the empty and non-existent cases (#431, @samoht)
• Allow to specify branches in urls for fetch using the url#branch syntax (#432, @samoht)
• Expose Irmin.Merge.idempotent for values with idempotent operations (#433, @samoht)
• Add a S.repo type as an alias to the S.Repo.t (#436, @samoht)
• Fix regression in S.Tree.diff intoduced in the 1.0 release: nested differences where reported with the wrong path (#438, @samoht)

irmin-unix

• Update to irmin.1.1.0 API changes (@samoht)

irmin-git

• Update to irmin.1.1.0 API changes (@samoht)

1.0.2 (2017-03-27)

irmin

• Add a cstruct type combinator (#429, @samoht)
• Fix regression introduced in 1.0.1 on merge of base buffers (strings, cstruct). For these types, updates are idempotent, e.g. it is fine if two concurrent branches make the same update. (#429, @samoht)

irmin-unix

• Add irminconfig man page (#427, @dudelson)

1.0.1 (2017-03-14)

irmin

• Default merge function should not assume idempotence of edits (#420, @kayceesrk)
• Wrap the merge functions for pair and triple with the default case. (#420, @kayceesrk)

irmin-unix

• Support all versions of cmdliner, 1.0.0 included (@samoht)

1.0.0 (2017-02-21)

Major API changes:

• It is now simpler to define mergeable contents, using new combinators to describe data-types (see Type).

• The mutable views have been replaced by immutable trees, and made first-class citizen in the API (see available S.Tree). Transactions now only ensure snapshot isolation instead of full serialisability.

• Creating a store with default path and branch implementations is now easier using the KV functors which just take one parameter: the contents.

• the backend and user-facing API are now totally independant (instead of being half-included in each other in irmin.0.*), so that backends have to implement the minimum set of functions to be Irmin-compatible, and users can have many convenient high-level functions when using the Irmin API. The backends implement AO and RW, the frontend provides S.

The package is also now split into 5 opam packages: irmin, irmin-git, irmin-http, irmin-unixandirmin-miragewith similarly namedocamlfind` libraries.

More detailled changes:

• use result type everywhere (#397, @samoht)
• use Fmt everywhere (#397, @samoht)
• rename create functions into v (#397, @samoht)

irmin

• [info] rename Task into Info to denote commit info (#397, @samoht)

• [info] remove Task.uid (#397, @samoht)

• [info] Commit messages are now plain strings (instead of a lists of strings): change Task.messages into Info.message, take a string instead of a list of strings as parameter and remove Task.add (#397, @samoht)

• [info] change Info.f to only takes unit as argument. Previously it was taken an 'a which was used by the update functions. The update functions now take a full Info.f function as parameter, which should be less confusing (#397, @samoht)

• [merge] replace the dependency to mirage-tc by a new internal module Type using type-based combinators. This makes defining new mergeable data-types much easier, especially records and variants (#397, @samoht)

• [merge] change [Merge.t] to be an abstract type (#397, @samoht)

• [merge] add [Merge.f] to transform a [Merge.t] value into a merge function (#397, @samoht)

• [merge] add base merge combinators: Merge.unit, Merge.bool, Merge.char, Merge.int, Merge.int32, Merge.int64, Merge.float (#397, @samoht)

• [merge] simplify the type of Merge.option, Merge.pair, Merge.tripleandMerge.alist` (#397, @samoht)

• [merge] simplify and rename Merge.MSet into Merge.MultiSet (#397, @samoht)

• [merge] simplify and rename Merge.set into Merge.Set (#397, @samoht)

• [merge] rename Merge.OP into Merge.Infix and rename operators to avoid name-clashing with other monads (#397, @samoht)

• [merge] remove the path argument from the merge functions (#397, @samoht)

• [merge] remove the need to defined a Path submodule in Contents.S (#397, @samoht)

• [merge] add a (very simple at the moment) Diff module (#397, @samoht)

• [api] read operations do not take a task parameter anymore (#397, @samoht)

• [api] write operations not take a full commit info instead of a confusing 'a parameter (#397, @samoht)

• [api] rename [Ref] into [Branch] (#397, @samoht)

• [api] replace S.read by S.find (#397, @samoht)

• [api] replace S.read_exn by S.get (#397, @samoht)

• [api] add S.kind to check the kind of store entries (files, directories) (#397, @samoht)

• [api] remove the View functor, replaced by first-class support for immutable trees S.Tree (#397, @samoht)

• [api] add S.find_tree to find immutable subtrees (#397, @samoht)

• [api] add S.find_all to find contents and metadat (#397, @samoht)

• [api] change S.mem to only check for contents, not subtree (#397, @samoht)

• [api] add S.mem_tree to check for subtrees (similar behavior to S.mem in irmin.0.*) (#397, @samoht)

• [api] add S.with_tree for atomic update of subtrees. This operation replaces with_hrw_view, but a weaker consistency guarantee: instead of providing full seriasilabilty, S.with_tree provides snapshot isolation, which is consistent enough for most of the users. (#397, @samoht)

• [api] rename S.update into S.set and ensure that the operation is atomic by using a combination of test-and-set and optimistic concurrency control. (#397, @samoht)

• [api] change S.remove to ensure the operation is atomtic.

• [api] add S.status to mimick git status. (#397, @samoht)

• [api] remove all the _id suffixes. (#397, @samoht)

• [api] add S.merge_with_commit and S.merge_with_branch (#397, @samoht)

• [api] more precise return type for S.Head.fast_forward (#401, @samoht)

• [api] add S.Commit, S.Branch (#401, @samoht)

• [api] add KV_MAKER to ease the creation of store with string lists as paths and strings as branches (#405, @samoht)

• [backend] replace RO.read by RO.find (#397, @samoht)

• [backend] no more RO.read_exn (#397, @samoht)

• [backend] no more RO.iter, replaced by RW.list (#397, @samoht)

• [backend] replace RW.update by RW.set (#397, @samoht)

• [backend] rename RW.compare_and_set into RW.test_and_set (#397, @samoht)

• [backend] new RW.watch, RW.watch_key and RW.unwatch functions to set-up low-level notifications (#397, @samoht)

irmin-git

• Adapt to git.0.10.0 (#397, @samoht)
• Remove the LOCK modules (#397, @samoht)
• Rename S.Internals into S.Git (#397, @samoht)
• Rename S.Internals.commit_of_id into S.Git.git_commit (#397, @samoht)
• Add S.Git.of_repo to convert an Irmin repo into a Git repo (#397, @samoht)
• Add S.Git.to_repo to convert a Git repo into an Irmin repo (#397, @samoht)
• Expose S.Git_mem.clear and S.Git_mem.clear_all for in-memory Git backends (#397, @samoht)
• Rename Memory into Mem.Make (#405, @samoht)
• Rename FS into FS.Make (#405, @samoht)
• Remove CONTEXT and fold it into IO (#405, @samoht)
• Add Mem.KV and FS.KV to ease creatin of store with default implementations for branches and paths (#405, @samoht)
• Add Mem.Ref and FS.Ref access tags, remotes and other Git references (#407, @samoht)
• Allow to set-up a custom .git path (#409, @samoht)

irmin-mirage

• Adapt to Mirage3 (@hannesm, @yomimono, @samoht)
• Rename the Task module into Info to reflect the core API changes
• Change Info.f to accept an optional author argument and a format string as a message parameter (#261, #406 @samoht)
• Rename Irmin_git into Git (#405, @samoht)

irmin-http

• Remove the high-level HTTP API (#397, @samoht)
• Rewrite the low-level (backend) API using ocaml-webmachine (#397, @samoht)
• Add KV to ease creatin of store with default implementations for branches and paths (#405, @samoht)

irmin-unix

• Rename Irmin_unix.task into Irmin_unix.info (#397, @samoht)
• Remove LOCK (#397, @samoht)
• Change Irmin_unix.info to take an optional author argument and accept a format string as message parameter (#261, #406 @samoht)
• Rename Irmin_fs into FS (#405, @samoht)
• Rename Irmin_git into Git (#405, @samoht)
• Rename Irmin_http into Http (#405, @samoht)

0.12.0 (2016-11-17)

• Depends on irmin-watcher 0.2.0 to use portable file-system watches (fsevents on OSX or inotify on Linux) to replace the slow and CPU intensive file-system polling that was the default (#380, @samoht)
• Do not use Lwt_unix.fork in the tests anymore (#383, @samoht)
• Switch from Stringext to Astring (#382, @samoht)
• Fix regression in the tests for using Git over HTTP (#376, @samoht)
• Catch top-level exceptions in watch callbacks (#375, @samoht)
• Fix merge of assoc list with no common ancestor (#374, @samoht)
• Improve documentation for Git bare repositories (#363, @kayceesrk)
• New functor Make_with_metadata to customize the type of the nodes metadata (#364, @samoht)
• Remove mentions of private modules from the public interface (#364, @samoht)

0.11.1 (2016-06-14)

• Fix compilation of examples (#359, @samoht)

0.11.0 (2016-05-04)

• Use Logs (#342, @talex5)
• Improve non-unix portablity of Irmin_fs (#345, @samoht)
• Change the signature of Store.iter to defer opening the file only when needed. This was causing a file-descriptor early exhaustion on Windows (#345, @samoht)
• Fix paths for references on Windows (#345, @samoht)
• Port to ocaml-git 1.8.0
• Rather large API change in Irmin.Private.Contents.Store and Irmin.Private.Commit.Store to make it easier to build new and efficient Irmin backends. (#346, @samoht)
• Fix performance problem in the computation of LCAs (#351, @talex5)
• Fix sort order for Git trees (#352, @talex5)

0.10.1 (2015-11-26)

• Support for launchd: the --address argument of the CLI now supports a URI launchd://<name> where <name> corresponds to the section in the property list file (#321, by @djs55)
• Expose /watch-rec in the REST API (#326, by @samoht)
• Expose Store.Key = Contents.Path in Irmin.Maker. Otherwise, the type of steps is abstract. (#327, by @talex5)

0.10.0 (2015-10-14)

• Fix the Irmin_mem backend to work when equal keys might be not structurally equal (Pervasives.(=) is evil)
• Fix Hash.SHA1.equal to always return true when the underlying bigarrays are equals. Before that, this was only the case when the whole Cstruct.t where identical: ie. same bigarray but also same offset in the Cstruct.t value, which is obviously not always the case. Apply the same fix to Hash.SHA1.compare and Hash.SHA1.hash.
• Renamed "tag" to "branch" in the API, as "tag" is confusing for Git users. BC.tag is now BC.name and BC.branch is now BC.head_ref. The various "Tag" modules are now called "Ref" ("Branch" would be confusing here since they only store references to commits, not the branch contents). Note: The remote HTTP protocol still uses "tag".
• Remove Irmin_http_server.listen. Instead, return the Cohttp configuration for the server and let the user perform the listen. The resulting API is simpler (removes timeout and uri parameters), more flexible, and easier to use from Mirage.
• Remove Irmin.task from API of internal stores (commit, node, etc). Tasks are now passed explicitly to operations that need them, so it is now explicit which operations create commits. For example, the API now makes it clear that lcas doesn't change anything, while lca requires a task because it may create commits. Apart from simplifying the code, this change also makes it possible to create the internal stores once, not once per commit message. Note: this does not affect the main BC API, so most users will see no difference.
• Remove Irmin.Basic. This was a functor that took a functor for making stores and returned a functor for making stores with strings for branch names and SHA1 for the hash. It's easier to write the application out in full than to explain to people what it does. This change also makes it possible for back-ends to provide extra operations in a type-safe way. In particular, Irmin_git.Internals has moved inside the store type and the runtime check that it is only used with the correct store type is now enforced at compile time instead.
• Removed AO.config. It was only used by the removed Git.Internals hack.
• Moved AO.create to AO_MAKER.
• Remove dummy functions that are no longer needed with the new API:
  • View.task is gone (it never did anything).
  • View.create is gone (it ignored both its arguments and called View.empty).
  • Ir_node.Graph.Store.create (unused, but previously required by AO).
  • Ir_commit.History.Store.create (same).
• Removed the unused-and-not-exported Ir_bc.Make and Ir_bc.MAKER features.
• Combine Ir_bc.STORE_EXT and Ir_s.STORE. Ir_s was the only consumer of the Ir_bc.STORE_EXT interface, and all it did was repack the values to match its own interface. Now, Ir_bc exports the final public API directly, which simplifies the code.
• Moved module types into ir_s.mli and removed ir_s.ml. Before, all module types were duplicated in the .ml and .mli files.
• BC stores now contain a Repo module. A Repo.t represents a repository as a whole, rather than any particular branch. Operations which do not look at the current branch have been moved to this module. They are: branches, remove_branch, heads, watch_branches, import, export, and task_of_head. When updating old code, you can use BC.repo t to get a Repo.t from a branch. Note that heads previously ensured that the current branch's head was included in the returned set (which made a difference for anonymous branches). This feature has been removed. In the future, the plan is to use OCaml's GC to track which anonymous branches are still being used and return all of them.
• The internal stores (commit, node, etc) used to implement a full BC store are now created by the back-ends, not by Ir_bc. This allows back-ends to use their own APIs for this. In particular, back-ends can now share resources (such as a database connection) between stores. Internal stores no longer need to deal with config values at all.
• Sync.create now takes a Repo.t, not a config, allowing Repo.config to be removed and allowing sharing of the back-end's internal state with the sync code. For example, the Git back-end no longer needs to create a new Git store object for sync.
• Change type head to type commit_id. head was confusing because it applied to all commits, not just branch heads. Putting id in the name makes it clear that this is just data and (for example) holding an ID will not prevent the corresponding commit from being GC'd (once we have GC). of_head is now of_commit_id, task_of_head is now task_of_commit_id, Internals.commit_of_head is now Internals.commit_of_id and BC.Head is now BC.Hash.

0.9.10 (2015-10-01)

• Expose the Git compression level (#104, #298 by @samoht)
• Add an optional config argument to all the backend's config functions. This allow the backends to composed more easily. (initial patch by @nasrallahmounir, integration by @samoht)
• Add signatures for immutable link store, to store links between keys: Irmin.LINK and Irmin.LINK_MAKER. Add Irmin_mem.Link and Irmin_fs.Link which implement Irmin.LINK_MAKER in these backends (initial patch by @nasrallahmounir, integration by @samoht)
• Add signatures for raw values (ie. whose values are of type Cstruct.t): Irmin.RAW and raw store maker: Irmin.AO_MAKER_RAW (initial patch by @nasrallahmounir, integration by @samoht)
• Expose Irmin.Hash.digest_size (initial patch by @nasrallahmounir, integration by @samoht)
• Expose /view to the REST API (#292, by @samoht)
• Expose Irmin.Private.merge_node (#292 by @samoht)
• Change the JSON stream API, which requres ezjsonm.0.4.2. (#266, #269, #273 by @samoht)
• Fix a race when a lot of processes are trying to add a watch at the same time. (#270, #271, by @samoht)
• Expose Irmin_git.Irmin_value_store functor. This provides the Irmin Contents/Node/Commit APIs on top of a Git-type store. This is useful for backends that want to store data using the Git object format, to be able to sync with Git, but without using Git's filesystem layout and locking. (#268 by @talex5)
• Remove the first-class module API. It's confusing to duplicate the API (#293, by @talex5)

0.9.9 (2015-08-14)

• Allow raw bodies in queries and responses for the REST API. This is controlled by the Content-type field set by the client: by default, we still use JSON (or use application/json) but using application/octet-stream will avoid having to hex-encode large binary blobs to make them JSON-compatible. This feature is still experimental (especially when using Git on the server) (#255)
• Adapt to ocaml-git.1.7.1 (which works with lwt.2.5.0)
• Expose Store.config for all the stores (AO, RW, etc.)
• Expose Irmin_git.Internals to be able to get back the Git commit objects from an head value (#245, #241)
• Expose Irmin.Private.remove_node
• Remove the special __root__ filename in Irmin stores and in views (#233)
  • This fixes View.update_path when the view contains a value at its root. Now the updated path contains a the value stored at the root of the view.
  • Writing a value to the root of a store is now an error
  • Reading a value at the root of a store always return None
• Make the HTTP backend re-raise the Invalid_argument and Failure exceptions that were raised by the server.

0.9.8 (2015-07-17)

• Fix wrong interaction of in-memory views and temporary branches in the store (#237)
• Fix Irmin.update_tag for HTTP clients
• Initial MirageOS support. Expose Mirage_irmin.KV_RO to surface an Irmin store as a read-only key/value store implementing `V1_LWT.KV_RO (#107)
• Expose `Irmin_git.Memory_ext. This allows the Git memory backend to be configured with a non-empty conduit context.
• Expose Irmin.SYNC
• Transmit client tasks to the HTTP server on DELETE too (#227, @dsheets)
• Do note expose private types in the public interface (#234, @koleini)
• Fix missing zero padding for date pretty-printing (#228, @dsheets)
• Update the tests to use ocaml-git.1.6.0
• Improve the style of the HTTP commit graph.
• Constraint the string tags to contain only alpha-numeric characters and few mores (-, _, '.' and /) (#186)
• Fix a race condition in Irmin.clone. (#221)
• Escpate double quotes in the output of commit messages to workaround HTML display issues. (#222)

0.9.7 (2015-07-06)

• Add a version check for HTTP client and server. The client might add the version in the HTTP headers using the X-IrminVersion header - the server might decide to enfore the version check or not. The server always reply with its version in the JSON reply, using a version field. The client might use that information to bail out nicely instead of failing because of some random unmarshalling errors due to API changes (#167)
• Fix a regression in 0.9.5 and 0.9.6 when inserting new child in Git trees. This could cause a tree to have duplicate childs having the same names, which would confuse the merge functions, make git fsck and git gc complain a lot (with good reasons) and do some fency things with git index. The regression has been introduced while trying to fix #190 (the fix is in #229)

0.9.6 (2015-07-03)

• Fix the datamodel: it is not possible to store data in intermediate nodes anymore (#209)
• Fix serialization of slices (#204)
• Do not fail silently when the synchronisation fails (#202)
• Fix a race in the HTTP backend between adding a watch and updating the store. In some cases, the watch callback wasn't able to see the first few updates (#198)
• Fix a race for all the on-disk backends between adding a watch and updating the store. This is fixed by making Irmin.Private.Watch.listen_dir and Irmin.Private.Watch.set_listen_dir_hook synchronous.
• Update the tests to use alcotest >= 0.4. This removes the dependency towards OUnit and nocrypto for the tests.
• Make the file-locking code a bit more robust

0.9.5 (2015-06-11)

• Fix Irmin.export for the HTTP backend (#196, patch from Alex Zatelepin)
• Fix a race in Irmin.export (#196, patch from Alex Zatelepin)
• Add Task.empty (the empty task) and Task.none (the empty task constructor)
• Completely rewrite the notification mechanism. All the watch functions now take a callback as argument and return a de-allocation function. The callbacks receive a heads values (the last and current ones) and diff values. (#187)
  • Add Irmin.watch_head to watch for the changes of the current branch's head
  • Add Irmin.watch_tags to watch for the changes of all the tags in the store
  • Add Irmin.watch_key to watch for the changes of the values associated to a given key (this is not recursive anymore).
  • Add View.watch_path to watch for the changes in a subtree. The function return views and the user can use View.diff to compute differences between views if needed.
• Transfer the HTTP client task to the server to make the commit messages relative to the client state (and not the server's) (#136)
• Fix View.remove to clean-up empty directories (#190)
• Fix the ordering of tree entries in the Git backend (#190)
• Allow to create a new head from a view and a list of parents with View.make_head (#188)
• Allow to create an empty temporary branch with Irmin.empty (#161)
• Use a pure OCaml implementation of SHA1, do not depend on nocrypto anymore (#183, by @talex5)
• Remove Irmin.Snapshot. Nobody was using it and it can be easily replaced by Irmin.head, Irmin.watch_head and Irmin.update_head.
• Change signature of Irmin.iter to include the values and move it into the Irmin.RO signature.
• Add Irmin.fast_forward_head (#172)
• Add Irmin.compare_and_set_head (#171)
• Simplify the RW_MAKER signature (#158)
• Fix Irmin_git.RW_MAKER (#159)
• Improve the efficiency of the LCA computation (#174, with @talex5 help)
• By default, explore the full graph when computing the LCAs. The previous behavior was to limit the depth of the exploration to be 256 by default.

0.9.4 (2015-03-16)

• Ensure that Irmin.update and Irmin.merge are atomic.
• Fix Irmin.clone of an empty branch
• Add Irmin.RW.compare_and_test that the backends now have to implement to guarantee atomicity of Irmin's high-level operations.
• Add Irmin.Private.Lock to provide per-handler, per-key locking. This can be used by backend to implement simple locking policies.
• Add Lwt.t to the return type of Irmin.tag and Irmin.tag_exn
• Do not throw [Not_found]. Now all the _exn function raise Invalid_argument (#144)
• Remove Irmin.switch and Irmin.detach
• Add Irmin.history to get the branch history as a DAG of heads (#140).
• Fix performance of lcas computation (#160)
• Add Irmin.Merge.promise combinators

0.9.3 (2015-01-04)

• Fix the invalidation of the view caches (report by @gregtatcam). This was causing some confusing issues where views' sub-keys where not properly updated to to their new values when the view is merged back to the store. The issues is a regression introduced in 0.9.0.
• Add post-commit hooks for the HTTP server.
• Add Irmin.watch_tags to monitor tag creation and desctructions.
• Fix Irmin.push
• Add Irmin.with_hrw_view to easily use transactions.
• Add a phantom type to Irmin.t to denote the store capabilities read-only, read-write or branch-consistent.
• The ~old argument of a merge function can now be optional to signify that there is no common ancestor.
• Expose Irmin.with_rw_view to create a temporary, in-memory and mutable view of the store. This can be used to perform atomic operations in the store (ie. non-persistent transactions).
• Simplify the view API again
• Expose the task of previous commits. This let the user access the Git timestamp and other info such as the committer name (#90)
• The user-defined merge functions now takes an unit -> 'a result Lwt.t argument for ~old (instead of 'a). Evalutating the function will compute the least-common ancestors. Merge functions which ignore the old argument don't have to pay the cost of computing the lcas anymore.
• Expose S.lca to get the least common ancestors
• Update to ocaml-git 1.4.6

0.9.2 (2015-01-19)

• Fix S.of_head for the HTTP client (regression introduced in 0.9.0)
• Fix regression in displaying the store's graph over HTTP introduced by 0.9.0.
• Fix regression in watch handling introduced in 0.9.0.
• Fix regressions in Views introduced in 0.9.0. (thx @buzzheavyyear for the report)
• Always add a commit when calling a update function (Irmin.update Irmin.remove, Irmin.remove_rec) even if the contents' store have not changed.
• The [head] argument of [Git_unix.config] now has a proper type.
• Expose synchronisation functions for basic Irmin stores.
• The user-provided merge function now takes optional values. The function is now called much more often during recursive merges (even if one of the 3 buckets of the 3-way merge function is not filled -- in that case, it uses None).
• Also expose the type of the keys in the type basic Irmin stores. Use ('key, 'value) Irmint.t instead of 'value Irmin.t.
• The user-defined merge functions now take the current filename being merged as an additional argument.
• The user-defined Contents should expose a Path sub-module. Keys of the resulting Irmin store will be of type Path.t.
• Fix irmin init --help. (#103)

0.9.1 (2014-12-26)

• Port to Cohttp 0.14.0+ HTTP interface (#102)

0.9.0 (2014-12-20)

• Improve the efficiency of the Git backend
• Expose a cleaner API for the Unix backends
• Expose a cleaner public API
• Rename Origin into Task and use it pervasively through the API
• Expose a high-level REST API over HTTP (#80)
• Fix the Git backend to stop constantly overwrite .git/HEAD (#76)
• Add a limit on concurrently open files (#93, #75)
• Add remove_rec to remove directories (#74, #85)
• Remove dependency to core_kernel (#22, #81)
• Remove dependency to cryptokit and sha1and usenocrypto` instead
• Remove dependency to caml4
• Fix writing contents at the root of the store (#73)
• More efficient synchronization protocol between Irmin stores (#11)

0.8.3 (2014-06-25)

• Views now keep track of their parent commits - this makes View.merge_path looks like a merge between branches. All the view operations are squashed in a unique commit.
• Better graphs, where we only show the commit history (the full graph is still available using --full on the command-lineor or ?full=1 on the web interface)
• By default, do not call dot when dumping a graph on the command-line. dot does not like big graphs, but that's still useful to have the .dot file to analyze it.

0.8.2 (2014-06-11)

• Support backend specific protocols for push/pull
• The Irmin Git backend can now sync with remote Git repositories
• Simplify the organisation of the libraries: irmin, irmin.backend, irmin.server and irmin.unix (check how the example are compiled)
• Small refactoring to ease the use of the API. Now use open Irmin_unix at the top of your file and use less functor in your code (again, check the examples)

0.8.1 (2014-06-02)

• Fix the behavior of IrminMemory.Make to return an hanlder to a shared datastore instead of creating a fresh one. Add IrminMemory.Fresh to return a fresh in-memory datastore maker.
• The HTTP server now outputs some nice graph (using dagre-d3). Don't expect to display very large graphs
• More friendly tag names in the Git backend (no need to prefix everything by refs/heads/ anymore)
• Partial support for recursive stores (WIP)

0.8.0 (2014-05-27)

• Spring clean-ups in the API. Separation in IrminBranch for fork/join operations, IrminSnapshot for snapshot/revert operations and IrminDump for import/export operations. The later two implementation can be derived automaticaly from a base IrminBranch implementation. The update and merge operations are supported on each backend
• IrminGit does not depend on unix anymore and can thus be compile to javascript or xen with mirage
• No need to have bin_io converter for contents anymore
• No need to have JSON converter for contents anymore
• No more IrminDispatch
• Add an optional branch argument to Irmin.create to use an already existing branch
• Fix order of arguments in Irmin.merge

0.7.0 (2014-05-02)

• Feature: support for in-memory transactions. They are built on top of views.
• Feature: add support for views: these are temporary stores with lazy reads + in-memory writes; they can be used to convert back and forth an OCaml value into a store, or to have a fast stagging area without the need to commit every operation to the store.
• Support custom messages in commit messages
• Improve the IrminMerge API
• Backend: add a 'dispatch' backend for combining multiple backends into one. This can be used to have a P2P store where there is well-defined mapping between keys and host (as a DHT).
• Fix: limit the number of simulteanous open files in the Git and the file-system backend
• Speed-up the in-memory store
• Speed-up the import/export codepath
• Speed-up the reads
• Speed-up IrminValue.Mux
• Deps: use ocaml-sha instead of cryptokit

0.6.0 (2014-04-12)

• Support for user-defined contents (with custom merge operators)
• Support for merge operations
• Rename IrminTree to IrminNode to reflect the fact that we can support arbitrary immutable graphs (it's better if they are DAGs but that's not mandatory)
• Rename IrminBlob to IrminContents to reflect the fact that we also support structured contents (as JSON objects)
• Support for linking the library without linking to camlp4 as well (#23)

0.5.1 (2014-03-02)

• Port to use Cohttp 0.10.0 interface.

0.5.0 (2014-02-21)

• More consistent support for notifications. irmin watch works now for all backends.
• Support for different blob formats on the command-line
• Support for JSON blobs
• More flexible irmin fetch command: we can now choose the backend to import the data in
• Fix import of Git objects when the blobs were not imported first
• Support non-UTF8 strings as path name and blob contents (for all backends, including the JSON one)
• Speed-up the slow tests execution time
• Improve the output graph when objects of different kinds might have the same SHA1

0.4 (2014-01-21)

• The command-line tool now looks in the environment for the variable IRMIN to configure its default backend
• Add a Git backend
• Add Travis CI scripts to the repo
• Use Lwt_bytes and Lwt_unix instead of the custom-made IrminChannel
• Use bin_prot instead of a custom binary protocol
• Major refactoring: Value is now Blob, Revision is now Commit and Tag becomes Reference (rational: consistency with Git names)
• Use core_kernel instead of building a custom Identiable.S
• Use dolog instead of a custom log library
• Use mstruct (mutable buffers on top of cstruct) which is now released independently

0.3 (2013-12-13)

• Fix a fd leak in the filesystem bakend
• Functorize the CRUD interface over the HTTP client implementation
• Use oasis to build the project
• Use the now released separately ezjsonm and alcotest libraries

0.2 (2013-11-23)

• Fix the HTTP server responses
• More high-level tests
• Add unit-tests for the client CRUD interfaces (over memory and/or filesystem)
• Fix issues with the Tree API
• Implement a relatively efficent Import/Export scheme (#3)
• For more safety, the marshalled values are now typed in the binary protocol
• Add functions to dump the contents of the store as a Graphviz graph
• Polish the CLI which now looks usable enough
• Optimize the CRUD backend by executing high-level API functions on the server
• Improve and make the CLI easier to use
• Implement clone/pull/push/snapshot/revert in the CLI

0.1 (2013-10-30)

• Use an HTTP server as a front-end
• Initial support for in-memory and filesystem backends
• Simple signature for backends
• Binary protocol for storing values and metadata and for future network exchange