CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

[0.2.2] - 2026-08-19

Fixed

• pull_requests.mirror_objects could not work against GitHub, GitLab, or Bitbucket. The engine handed the destination side the rendered repository name, which is owner relative because the clone URL and repository creation prepend the owner themselves, while every destination pull request and comment endpoint interpolates that value as a fully qualified path: a GitHub destination asked for /repos/widget/pulls rather than /repos/acme/widget/pulls and every call answered 404. Azure DevOps failed the other way, duplicating the project into a path that already carried it, so listing pull requests 404d for every repository
• Mirroring several repositories at once could abort the process. Pull request records were written into the shared git state from inside the engine's worker pool without the lock the engine uses for its own access, and two repositories finishing together is a concurrent map write, which Go turns into an unrecoverable crash. The state type now guards its own maps
• A private Docker Hub repository with watch_tags on failed with a 404 blamed on the image. The login response's session token was discarded, so every listing fell back to HTTP basic auth, which that API does not accept
• A destination pull request stayed open forever once its source merged or closed. Sources are listed open only, so a finished pull request stops appearing rather than arriving with a final state, and nothing closed the mirror; the branch under it was pruned by the mirror push meanwhile. Records the source no longer lists are reconciled and closed with a note
• Every pull request carrying a mirrored inline comment failed its conversation sync after the first run. GitHub keeps discussion and review comments in separate id spaces reached through different routes, and both were addressed through the discussion route
• A conversation that failed part way discarded the ids of the comments it had already posted, so the next run reposted all of them, forever. A repository whose pull request pass failed was also recorded as fully mirrored, so it was skipped on the next run and never retried until an unrelated branch or tag moved
• A single failed fetch of a pull request head deleted that branch from the destination, pulling the head out from under a mirrored pull request. The copy from the previous run is kept
• The image sync cron could overlap itself, corrupting the run report and racing on the sync state map. Both cron loops now skip a tick rather than start a second run, validate the schedule before the first run instead of after it, and install the signal handler before the first run so a shutdown during it can still persist state
• A malformed exclude glob was ignored entirely, mirroring a repository that the rule was written to keep out. Filter patterns are validated at config load
• A Slack notification could be dropped whole. One oversized failure line, such as a transport error carrying a large HTML body, produced a block that was empty or over the size limit, and Slack rejects both
• A failed state save on the fail-fast path was silent, so everything copied before the abort was copied again on the next run with no explanation
• git-sync could not authenticate to Azure DevOps over git in pat mode, fixed in v0.2.1 and described there

Removed

• The SyncerD scheduled workflow, which ran syncerd sync --once against a syncerd.yaml this repository has never contained. It had failed on every run since at least June, and its push trigger filtered on a path that does not exist. Deleted rather than repaired: the dogfooding it was meant to do is not wanted, and a workflow that has only ever failed is worse than none

Fixed

• SyncerD parsed its own binary as its configuration. Config discovery accepted an extensionless file named syncerd, which is exactly what make build writes into the working directory, so running ./syncerd sync beside the binary failed with yaml: control characters are not allowed, an error that points at nothing. Discovery now accepts only a real syncerd.yaml or syncerd.yml, and says where it looked when it finds neither
• A mirrored pull request with no labels failed to update, taking the whole pull request with it. Once the mirror owned labels, an empty set was sent as null rather than as an empty array, and GitHub rejects that with 422. Most pull requests carry no labels, so this affected most of them. Found by the live suite on its first real run

Added

• A live provider test suite behind the live build tag, run with make test-live. It creates two throwaway repositories against a real GitHub account, mirrors a pull request between them, and checks what actually landed, then deletes them. Every other test in the repository checks SyncerD against fakes written alongside the code, which is how three defects that made pull request mirroring inoperable passed a green suite and a review

Security

• Cleared two advisories in transitive Go modules, an infinite loop in golang.org/x/text and an out of bounds read in klauspost/compress. Neither was reachable from SyncerD's own code, but both had fixes and a later change could have started calling them
• Patched a high severity advisory in brace-expansion, which the Azure DevOps extension pinned to exactly the affected version through an overrides entry

[0.2.1] - 2026-08-19

Added

• git-sync can recreate pull requests at the destination. With pull_requests.mirror_objects on a mirror, each open source pull request becomes a real destination pull request, updated on every run, carrying its discussion comments, inline review comments anchored to the diff, review verdicts, and labels. A merged source pull request closes the destination one with a comment naming the source merge commit rather than merging it, because a destination merge would create a different commit that the branch mirror then overwrites. Review verdicts are mirrored as attributed text, never as real approvals, so a mirror cannot satisfy branch protection that no human satisfied. Mentions and issue references in mirrored text are neutralised, so mirrored content never notifies a destination account or cross links an unrelated issue. Everything SyncerD writes carries a hidden marker, so a lost state file causes re-inspection rather than duplicate pull requests, and only comments SyncerD wrote are ever edited or deleted. With mirror_objects on, every mirrored pull request gets a branch_prefix branch rather than fork heads alone, so a destination pull request has one uniform head name. Every provider type is supported, see below
• Pull request mirroring now works for every provider type, in any direction: GitLab, Bitbucket Cloud, Azure DevOps, and AWS CodeCommit join GitHub. Each maps onto the same model, and the runbook carries a table of what each provider cannot represent
• CodeCommit is in scope after all. It was excluded when the work was planned on the grounds that it had no pull request API worth mirroring, which was wrong: it has a full one, already present in the pinned SDK, and AWS returned the service to general availability on 2025-11-24 after closing it to new customers in 2024

Fixed

• git-sync could not authenticate to Azure DevOps over git in pat mode. The provider presented an empty username with the PAT as the password, and SyncerD hands git its credential through a helper that prints username=<value>: git reads an empty value as no username at all, tries to ask for one, and fails with could not read Username because terminal prompts are disabled. Azure DevOps ignores the username and authenticates on the token alone, so the organisation name is sent now. A basic credential carrying a password with no username is also rejected up front, where the cause can be named, rather than surfacing as a bare git error. The REST API path was never affected: it sends the token in an Authorization header
• A destination that cannot reopen a pull request, which is Bitbucket Cloud and CodeCommit, failed on every run once its mirror had been closed by hand. Having decided to leave the pull request closed, the engine still attempted an update on it, which both providers reject, so the failure was recorded before the divergence was: the warning fired every run, a failure was reported every run, and the mirror never settled. The same path ran for a merged source whose destination was already closed whenever new activity advanced its timestamp. An update now runs only while the destination is open, and a recorded divergence is re-checked each run so a destination somebody reopened by hand is picked back up
• A CodeCommit source served the first run's snapshot forever. Its pull request cache was documented as per run but a provider is built once and reused for every tick of the schedule, so later pull requests were never mirrored, closed ones never closed, and the repository was skipped as unchanged because the same stale set fed the ref fingerprint
• An Azure DevOps source mirrored each pull request exactly once and then froze it. Azure reports no update timestamp, and standing the creation date in for one meant the engine's watermark always matched, so no later edit, comment, or verdict reached the destination. A source that reports no timestamp is no longer watermarked
• CodeCommit reported "no reviews" when the underlying call failed, and the caller deletes mirrored comments it no longer sees at the source, so a single throttled call deleted every mirrored review verdict. It surfaces the error instead. For the same reason, a transient failure posting an anchored comment is no longer treated as a rejected anchor, which would have downgraded it to a plain comment permanently
• CodeCommit could not find a destination pull request that had been closed, so a lost state file created a second one for the same branch. GitLab anchored every comment on a deleted line to line 0 on the wrong side of the diff, and read its transient locked state as closed, which closed the destination and posted "closed without merging" moments before the source became merged. Bitbucket dropped the draft flag on update and could not find a superseded pull request. GitHub reported no base SHA, so every inline comment mirrored to GitLab or CodeCommit, which both require one, silently became a plain comment. Azure DevOps counted a description limit in bytes rather than characters, truncating non-ASCII text to roughly a third of the allowed length
• Turning comments or reviews off deleted everything previously mirrored in that category. Deletion is now scoped to the categories a run actually listed

Changed

• vcs.PullRequestSpec carries SyncLabels, so a provider can tell "the source has no labels", where a destination label should be removed, from "label mirroring is off", where a label somebody added at the destination must be left alone. Labels are now reconciled rather than only added: one removed at the source is removed at the destination
• vcs.PullRequestWriter closes a pull request but no longer reopens one. Bitbucket Cloud has no reopen endpoint and CodeCommit permits only the OPEN to CLOSED transition, so reopening is now an optional vcs.PullRequestReopener capability. A destination that lacks it leaves the pull request closed, warns once, and records the divergence rather than opening a second pull request for the same work or retrying on every run
• vcs.ReviewComment carries BaseSHA alongside CommitSHA: GitLab refuses to anchor an inline comment without base, head, and start SHAs, and CodeCommit needs a before and after commit id. A source that cannot supply them downgrades the comment to a discussion comment rather than dropping it

[0.2.0] - 2026-08-19

Added

• git-sync can mirror the commits behind open pull requests. A pull request opened from a fork has no branch in the source repository, so its commits previously reached no destination at all; with pull_requests.enabled on a mirror, the head is pushed as an ordinary branch under branch_prefix (default syncerd/pr/<number>), and the default mirror push mode prunes it once the pull request closes. A head that lives in the source repository already arrives with the ordinary branch mirror and gets no second copy. A repository whose own branches sit under the prefix is refused rather than silently overwritten, and one unreachable fork head is a warning rather than a failed repository. Off by default: a fork head is third party code, and a destination that builds on branch push would run it. GitHub sources only for now; the pull request objects themselves are not recreated at the destination yet

Fixed

• git-sync discovered only the public repositories of a GitHub personal account. The listing fell back to GET /users/{owner}/repos when the owner was not an organisation, and that endpoint returns public repositories only, whatever token is presented, so private repositories were silently missing from every run with no error to point at. When the token belongs to the configured owner, SyncerD now lists through GET /user/repos?visibility=all&affiliation=owner, which reports private repositories. Mirroring another account still sees its public repositories only, since no credential can see further
• git-sync failed outright at the discover stage when a GitLab source was a user namespace rather than a group: only GET /groups/{owner}/projects was tried, and it 404s for a personal namespace. A 404 on the first page now falls back to GET /users/{owner}/projects, which lists private projects the token can see

Changed

• A git-sync mirror whose source discovery succeeds but reports no repositories at all now logs a warning naming the likely cause (a token that cannot read the source's private repositories), because an empty run was otherwise indistinguishable from a mirror that is up to date

[0.1.2] - 2026-08-14

Added

• Native authentication for private Amazon ECR destinations: when a destination host matches <account>.dkr.ecr.<region>.amazonaws.com, SyncerD calls ecr:GetAuthorizationToken through the standard AWS credential chain (environment variables, shared config, IRSA, instance role) instead of requiring a docker login. Tokens are cached per account and region and refetched before they expire, so a long-running sync no longer needs an external refresh loop, and a Kubernetes deployment using IRSA no longer needs a dockerConfigSecret for ECR. An existing docker credential entry for the same registry still wins, so setups that log in explicitly are unchanged. Public ECR (public.ecr.aws) is a different service and is not covered

Fixed

• The GitHub Action could not authenticate to any destination registry that was logged into with docker/login-action or aws-actions/amazon-ecr-login: it runs as a Docker container action, which does not receive the runner's ~/.docker/config.json, so every request failed with 401 Unauthorized. ECR now works with AWS credentials alone, and the README documents the DOCKER_CONFIG workspace path that makes the other registries' login steps visible to the container

[0.1.1] - 2026-08-14

Added

• --report <path> writes a machine readable JSON run summary after each run, one schema shared by sync and git-sync so a consumer does not need to know which command produced the file; written on failed runs too, since those are the ones worth inspecting, and a write failure never fails the run
• --log-format json opt in structured logging for sync and git-sync; text remains the default and reproduces the historical log.Printf output byte for byte, since operators grep it. JSON carries per repository and per run values as real fields
• --metrics-file <path> writes Prometheus textfile collector metrics (syncerd_last_run_unixtime, syncerd_last_success_unixtime, syncerd_last_run_success, syncerd_last_run_duration_seconds, syncerd_last_run_items) after each run, for both sync and git-sync, including failed runs; sync and git-sync series coexist in the same file. A git-sync --dry-run writes no metrics, since it created, pushed, and deleted nothing
• GitHub Action: new dry-run, report, metrics-file, and log-format inputs. dry-run is the safety guard for git mirroring, whose default push mode deletes destination refs absent at the source, and it was previously unreachable from a workflow (#38)
• Azure DevOps extension: documented git mirroring, including how provider tokens are supplied through pipeline variables. No code change was needed, since the task's command input already accepted any subcommand (#38)

Changed

• A run time failure (a bad config, an unreachable provider) now prints only the error, without cobra's flag usage dump that used to follow it; the error is routed through the same logger as every other line, so a --log-format json run stays parseable end to end. A flag parse error (a typo like --bogus-flag) is unaffected and still prints the usage block, since that failure never reaches the point where usage gets silenced

Fixed

• internal/state's atomic write no longer leaves a stray .tmp file behind when the rename fails, the same fix already applied to the run report writer
• The README's GitHub Action example for git mirroring omitted the env: block carrying provider tokens, so anyone copying it got token is required (#38)

[0.1.0] - 2026-08-11

Added

• New syncerd git-sync subcommand mirrors git repositories across GitHub, GitLab, Bitbucket, Azure DevOps, and AWS CodeCommit, in any direction. Repositories are discovered from the source provider and filtered by name glob, archived, and fork status; unchanged repositories are detected via a source ref fingerprint and skipped without cloning
• CodeCommit's git transport needs static IAM HTTPS Git credentials (git_username / git_password, or SYNCERD_GIT_<NAME>_GIT_USERNAME / SYNCERD_GIT_<NAME>_GIT_PASSWORD): SyncerD does not derive SigV4 git credentials, so IRSA and instance roles only cover the API (listing and creating repositories)
• Azure DevOps supports an entra auth mode where the operator supplies a Microsoft Entra ID access token through the same SYNCERD_GIT_<NAME>_TOKEN variable used for a PAT; SyncerD never acquires one itself
• Bitbucket support is Cloud only (api_url changes the host but not the Cloud shaped request paths, so Bitbucket Data Center is not supported), and Bitbucket has no archived concept, so skip_archived has no effect on a Bitbucket source
• Three push modes control how a mirror updates its destination: mirror (default) replicates the source exactly, deleting destination branches and tags absent at source; additive never deletes; fast-forward refuses any non fast-forward update and reports it as a failure
• An adopt guard refuses to push to a destination that already has content and no prior mirror state, so a misconfigured mirror cannot silently overwrite existing work; set adopt: true on the mirror to opt in
• --dry-run reports what would be created, pushed, and pruned, per repository and per ref; it creates, pushes, and deletes nothing at the destination, though it does populate the local clone cache, since git push --dry-run needs the objects available locally
• Helm chart: opt-in gitSync CronJob (gitSync.enabled: false by default) runs on its own schedule, separate from image sync, with its own persistence for the clone cache and mirror state
• Docker image now installs git, required for git-sync; image sync behaviour is unchanged
• GitHub Action: new command input selects sync or git-sync (defaults to sync)
• Helm chart: secret.gitTokens and secret.gitCredentials hold inline git provider tokens and CodeCommit static credentials, keyed by provider name; prefer existingSecret in production
• Helm chart: cronjob.enabled (default true) runs the image sync CronJob; set false for a deployment that only wants git mirroring

Fixed

• Docker image ENTRYPOINT was relative (./syncerd), so container actions running with --workdir /github/workspace failed with exec: "./syncerd": stat ./syncerd: no such file or directory; now absolute (/app/syncerd)
• The Action referenced image tag v1, which was never published; pinned to v0, the floating major tag the release workflow actually publishes for the current 0.x line

[0.0.11] - 2026-06-29

Changed

• Slack notifications now render as branded Block Kit messages: a colored bar (green for new syncs, red for failures), an emoji header with the count, code-formatted image refs grouped per destination in detailed mode, and a small SyncerD logo footer reading "SyncerD — powered by CloudDrove" (#31)

[0.0.10] - 2026-06-29

Fixed

• make install still produced dev (commit: unknown) because the install target ran a plain go install without ldflags — now injects version/commit like the other build targets (#29)
• Local build version string now uses the nearest tag without the v prefix (e.g. 0.0.9), matching the released binary format instead of the verbose git describe output (#29)

[0.0.9] - 2026-06-29

Fixed

• syncerd -v always printed dev (commit: unknown) because make build, docker build, and the CI image were built with a plain go build that never injected main.version/main.commit. Version and commit metadata are now injected via ldflags in the Makefile (git-derived), Dockerfile (VERSION/COMMIT build args), and release workflow (git tag + SHA) (#29)

[0.0.8] - 2026-06-29

Fixed

• Slack notifications never fired when only slack.webhook_url (or SYNCERD_SLACK_WEBHOOK_URL) was set, because slack.enabled defaulted to false and the notifier was never constructed — no success or failure alerts were sent (#27)

Changed

• Slack is now opt-out: configuring a webhook URL enables notifications automatically. Set slack.enabled: false (or SYNCERD_SLACK_ENABLED=false) to suppress
• Bound the previously unbound slack.enabled, slack.notify_on_new, and slack.notify_on_error keys to environment variables

[0.0.7] - 2026-06-28

Added

• Helm: values.schema.json so chart values are validated on install/template and Artifact Hub shows the "Values schema" badge
• Helm release pipeline now signs the published OCI chart with keyless cosign (Sigstore OIDC), enabling the Artifact Hub "Signed" badge

[0.0.6] - 2026-06-28

Security

• Resolved 38 vulnerabilities (1 critical, 14 high, 20 medium, 2 low, 1 unknown) reported by the Artifact Hub / Trivy image scan; 35 were Go stdlib CVEs fixed by rebuilding with a newer Go toolchain
• github.com/docker/cli bumped v27.5.1 → v29.6.1 (CVE-2025-15558)
• golang.org/x/sys bumped v0.15.0 → v0.46.0 (CVE-2026-39824)

Changed

• Go 1.23 bumped to Go 1.26 across go.mod, Dockerfile, and CI workflows (ci.yml, release.yml, syncerd.yml) to pick up patched standard-library crypto/tls, crypto/x509, net, net/url, and net/http fixes

[0.0.4] - 2026-02-26

Fixed

• Helm: docker config secret was mounted at /root/.docker which is inside /root (mode 700); non-root pod user (uid 1000) could not traverse the directory even with fsGroup set — mount path changed to /var/lib/syncerd/.docker and DOCKER_CONFIG updated to match

Changed

• Docker image is now built for linux/amd64 and linux/arm64 (multi-arch manifest); QEMU added to the release pipeline and --platform=$BUILDPLATFORM used in the builder stage for native-speed cross-compilation; GitHub Actions layer cache enabled

[0.0.3] - 2026-02-26

Fixed

• Helm: dockerConfigSecret was incorrectly used as imagePullSecrets; separated into a dedicated imagePullSecrets value for pulling the SyncerD image and dockerConfigSecret for destination registry auth
• Helm: set DOCKER_CONFIG=/root/.docker when dockerConfigSecret is configured so credentials are found when the pod runs as non-root
• Helm: state_path and SYNCERD_STATE_PATH are now empty when persistence.enabled: false, making stateless mode truly stateless (no file I/O)
• Helm: removed unused emptyDir data volume and mount in stateless mode
• DockerHubRegistry.Authenticate was a no-op; now validates credentials against the Docker Hub API at startup
• ListTags pagination silently swallowed errors and ignored context cancellation; now returns errors and checks ctx.Err() between pages; page size increased to 100
• ImageExists masked all errors as image-not-found; now only treats HTTP 404 as not-found and propagates all other errors
• Removed deprecated rand.Seed call (global source is auto-seeded since Go 1.20)
• Removed dead getDestinationImageName no-op switch; removed unused GetDefaultConfigPath function
• --once flag moved from root persistent flags to the sync subcommand where it belongs
• action.yml: fixed --once boolean flag passing to use --once=<value> syntax
• GitHub Actions syncerd.yml: removed invalid secrets context usage in if conditions; replaced with continue-on-error: true on optional registry login steps

Changed

• Go 1.21 (EOL) bumped to Go 1.23 across go.mod, Dockerfile, and CI workflows
• Docker base image pinned from alpine:latest to alpine:3.21
• Fixed go.sum* glob to go.sum in Dockerfile COPY

Added

• Initial release of SyncerD
• Support for syncing images from Docker Hub to multiple registries:
  • AWS ECR
  • Azure ACR
  • Google GCR
  • GitHub Container Registry (GHCR)
• Automatic tag detection and monitoring
• Cron-based scheduling for periodic syncs (default: every 3 weeks)
• YAML-based configuration with environment variable support
• GitHub Actions workflow support
• CLI tool with --once flag for one-time syncs
• Support for watching all tags or specific tags per image
• Authentication support for all registry types

Features

• Multi-registry destination support
• Automatic version detection
• Configurable sync schedules
• Secure authentication methods
• Comprehensive logging