sboms: Update changelog and improve error message (#1116)

* Update changelog + improve error message

* Remove newline

CHANGELOG.md

@@ -13,6 +13,10 @@ All notable changes to `src-cli` are documented in this file.
 
 ## 5.8.0
 
+### Added
+
+- SBOM support: Software Bill of Materials (SBOMs) can now be fetched for Sourcegraph releases after 5.8.0 using `src sbom fetch -v <release>`. [#1115](https://github.com/sourcegraph/src-cli/pull/1115)
+
 ### Changed
 
 - Update Go to 1.22.8

cmd/src/sbom_fetch.go

@@ -14,6 +14,7 @@ import (
 	"strings"
 	"unicode"
 
+	"github.com/grafana/regexp"
 	"github.com/sourcegraph/sourcegraph/lib/errors"
 	"github.com/sourcegraph/sourcegraph/lib/output"
 
@@ -186,6 +187,11 @@ func (c sbomConfig) getImageList() ([]string, error) {
 	defer resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
+		// Compare version number against a regex that matches versions up to and including 5.8.0
+		versionRegex := regexp.MustCompile(`^v?[0-5]\.([0-7]\.[0-9]+|8\.0)$`)
+		if versionRegex.MatchString(c.version) {
+			return nil, fmt.Errorf("unsupported version %s: SBOMs are only available for Sourcegraph releases after 5.8.0", c.version)
+		}
 		return nil, fmt.Errorf("failed to fetch list of images - check that %s is a valid Sourcegraph release: HTTP status %d", c.version, resp.StatusCode)
 	}