Build worktrees share the primary checkout's .git, so build tools can read
refs/heads there. Since the rewrite never moved those refs, they stayed frozen at
the last checkout: hs.hsadmin.ng's prQuickCheck compares master with
origin/master and therefore failed every build once origin moved on.
The sync runs after the enqueue decision on purpose — a local ref lagging behind
origin is exactly how the watcher recognizes new commits, so keeping the refs in
sync earlier (cron job, mirroring refspec, or this step moved up) would silence
the branch instead of building it.
Fast-forward only, as a compare-and-swap against the commit just read: diverged
or ahead branches stay untouched, and the checked-out branch is advanced with
merge --ff-only, which refuses to overwrite conflicting uncommitted changes.
Switched off with watcher.fastForwardLocalRefs: false.
Co-Authored-By: Claude <noreply@anthropic.com>
Works off the security audit in docs/prs/2026-07-08-PR#000: TODO 1, 8, 9
and 10, the four items that need no design decision.
New `SecretFiles` creates files holding secrets with mode 0600 and their
directories with 0700 *at creation*, as a file attribute, instead of
writing at the umask default and chmod-ing afterwards — that left a
window in which the Gitea token was world-readable, which matters on a
multi-tenant host. It is used by `init` for .git/gittally/.gittally.yml
and by `ControlTokenService` for the control token; the shell setup
script now writes its YAML in a `umask 077` subshell for the same reason.
`ControlTokenService.matches` hashes both sides with SHA-256 before
`MessageDigest.isEqual`, so the comparison always runs over two 32-byte
buffers and cannot return early on a length mismatch.
`GitService.checkout` and `fetchBranch` pass `--` before the refname, so
a branch named like an option cannot be read as one. `resetHardToOrigin`
keeps its plain form: `git reset --hard -- <commit>` is rejected outright
and its argument is already `origin/`-prefixed.
Co-Authored-By: Claude <noreply@anthropic.com>
