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c74f2f9216
The post-receive hook syncs pushed branches to the database, but
`is_empty` and the default branch of an empty repository were only
updated later by the `push_update` queue. Until then the API treated the
repository as empty (branch list `null`, `GET /branches/{branch}` 500),
and the queue overwrote the default branch chosen by the hook or set via
the API.
`SyncBranchesToDB` now initializes an empty repository and repairs a
default branch missing in git in its locked transaction, so the state is
final when `git push` returns. The push queue and web file edits retry
it while the repository is still empty.
- The default branch is the configured one if it exists, else `main`,
else `master`, else the first branch by name, like GitLab. HEAD follows
it.
- A first push of several branches no longer depends on push order. The
push that initializes a repository still prints no pull request hints,
like GitHub.
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Co-authored-by: silverwind <me@silverwind.io>