Follow-ups from #27627
- Memoizes `Config.Git()` with a mutex so the provider's ETag response
cache survives across calls. Only successful construction is cached;
errors are retried.
- Moves the HTTP client onto `Config.HTTPClient`, wired through
`ConvertConfig`, so `Git()` no longer takes a per-call argument that
would be silently ignored after memoization.
- `newGitHub` and `newGitLab` now return `(Provider, error)`,
eliminating the typed-nil-interface class in `gitprovider.New` rather
than the single instance.
- Gates the 304 branch on a `haveCached` flag instead of a nil body
check.
- Only caches bodies that decode successfully, preventing poisoned
entries.
- Keys the response cache on the full token digest rather than a
truncated prefix.
- Tests added: `TestConfigGitMemoizesProvider`,
`TestConfigGitRetriesOnConstructorError`,
`TestGitLabConstructorErrorReturnsNilInterface`,
`TestResponseCacheStore`,
`TestConditionalRequestReuse/MalformedResponseNotCached`;
`TestConvertYAML/CustomScopesAndEndpoint` now asserts
`Config.HTTPClient` wiring.
Follow-ups tracked in #28139, #28140, #28141, #28142.
> 🤖 Generated by Coder Agents on behalf of @johnstcn.
Adds the `head_branch` field (the source/feature branch name of a PR) to
the diff status pipeline. Previously only `base_branch` (target branch)
and the head commit SHA were captured from the GitHub API, but not the
head branch name itself.
## Changes
- **Migration 438**: Add `head_branch` nullable TEXT column to
`chat_diff_statuses`
- **gitprovider**: Parse `head.ref` from the GitHub API response
(alongside `head.sha`) and add `HeadBranch` to `PRStatus`
- **gitsync**: Wire `HeadBranch` through `refreshOne()` into the DB
upsert params
- **worker**: Map `HeadBranch` in `chatDiffStatusFromRow()`
- **coderd**: Convert `HeadBranch` in `convertChatDiffStatus()`
- **codersdk**: Expose as `head_branch` (`*string`, omitempty) in
`ChatDiffStatus` API response
- **Tests**: Updated `github_test.go` pull JSON fixtures and assertions
Adds `pull_request_title` and `pull_request_draft` to the chat diff
status pipeline (DB → provider → SDK → frontend). The GitHub provider
now fetches the PR title alongside existing status fields.
The agents sidebar now displays PR-state-aware icons for chats that have
a linked pull request (when the chat is in waiting/completed state):
- **Open PR**: `GitPullRequestArrow` (green)
- **Draft PR**: `GitPullRequestDraft` (gray)
- **Merged PR**: `GitMerge` (purple)
- **Closed PR**: `GitPullRequestClosed` (red)
Running/pending/paused/error chats keep their existing activity icons
(spinner, pause, error triangle).
### Changes
**Database migration** (`000432`): Adds `pull_request_title TEXT` and
`pull_request_draft BOOLEAN` columns to `chat_diff_statuses`.
**Backend pipeline**:
- `gitprovider.PRStatus` gains a `Title` field
- GitHub provider decodes the `title` from the API response
- `gitsync` and `coderd/chats.go` pass title + draft through to the DB
upsert
- `codersdk.ChatDiffStatus` exposes both new fields in the API response
**Frontend** (`AgentsSidebar.tsx`): New `getPRIconConfig()` function
resolves the appropriate Lucide git icon based on `pull_request_state`
and `pull_request_draft`. Only applies when the chat is in a terminal
state (waiting/completed).
**Real-time sync**: No changes needed — the existing
`diff_status_change` pubsub event already propagates the full
`ChatDiffStatus` including the new fields.
- Adds `_API_BASE_URL` to `CODER_EXTERNAL_AUTH_CONFIG_`
- Extracts and refactors existing GitHub PR sync logic to new packages
`coderd/gitsync` and `coderd/externalauth/gitprovider`
- Associated wiring and tests
Created using Opus 4.6
Cian Johnston