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fix(coding-agent): footer git branch not updating after external branch switches

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Git uses atomic writes (temp file + rename) which changes the inode.
fs.watch on a file stops working after the inode changes.
Now watches the directory containing HEAD and filters for HEAD changes.
This commit is contained in:
Mario Zechner 2026-01-11 23:27:22 +01:00
parent e4f1c0bb4d
commit c997305685
2 changed files with 11 additions and 3 deletions
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1
packages/coding-agent/CHANGELOG.md
View file

@ -23,6 +23,7 @@
- Session picker respects custom keybindings when using `--resume` ([#633](https://github.com/badlogic/pi-mono/pull/633) by [@aos](https://github.com/aos))
- Custom footer extensions now see model changes: `ctx.model` is now a getter that returns the current model instead of a snapshot from when the context was created ([#634](https://github.com/badlogic/pi-mono/pull/634) by [@ogulcancelik](https://github.com/ogulcancelik))
- Footer git branch not updating after external branch switches. Git uses atomic writes (temp file + rename), which changes the inode and breaks `fs.watch` on the file. Now watches the directory instead.
- Extension loading errors are now displayed to the user instead of being silently ignored ([#639](https://github.com/badlogic/pi-mono/pull/639) by [@aliou](https://github.com/aliou))
## [0.42.5] - 2026-01-11

13
packages/coding-agent/src/core/footer-data-provider.ts
View file

@ -103,10 +103,17 @@ export class FooterDataProvider {
const gitHeadPath = findGitHeadPath();
if (!gitHeadPath) return;
// Watch the directory containing HEAD, not HEAD itself.
// Git uses atomic writes (write temp, rename over HEAD), which changes the inode.
// fs.watch on a file stops working after the inode changes.
const gitDir = dirname(gitHeadPath);
try {
this.gitWatcher = watch(gitHeadPath, () => {
this.cachedBranch = undefined;
for (const cb of this.branchChangeCallbacks) cb();
this.gitWatcher = watch(gitDir, (_eventType, filename) => {
if (filename === "HEAD") {
this.cachedBranch = undefined;
for (const cb of this.branchChangeCallbacks) cb();
}
});
} catch {
// Silently fail if we can't watch