This PR changes the git store's `compute_snapshot`, which runs to update
state that depends on the contents of `.git`, to degrade gracefully when
fetching individual pieces of state fails. For example, when fetching
the list of branches fails, instead of returning early from the function
(leaving the previous git state snapshot in place with stale state), we
continue with an empty list of branches. This prevents failures of
individual git commands from making the entire git UI get stuck
indefinitely.
Self-Review Checklist:
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable
Closes #ISSUE
Release Notes:
- Fixed an issue where failing to fetch branches using the git CLI would
prevent other git-related state from being updated.
Adds a `runtime_diagnostics` section to the dev-only "Show Git Job
Queue" output so that when the queue gets stuck, we can tell from the
dump itself whether a git subprocess is wedged (and on supported
platforms, where it's wedged) without needing the user to run
`ps`/`sample`/`lsof` by hand.
The new section contains:
- **`processes`** — every transitive descendant of the Zed process, with
PID, PPID, name, executable, full argv, sysinfo status
(`Run`/`Sleep`/`Stop`/`Zombie`/etc.), and elapsed runtime.
Cross-platform via `sysinfo`. This is the single most useful field: it
instantly answers "is there a stuck `git` child or not?"
- **`linux_proc`** *(Linux only)* — for each descendant,
`/proc/<pid>/wchan` (the kernel function the thread is sleeping in, e.g.
`futex_wait_queue`, `pipe_read`) and `State:` from `/proc/<pid>/status`.
- **`macos_git_children`** *(macOS only)* — for any descendant whose
name contains `git`, a 2-second `sample` user-space stack and `lsof -p`
output. Each is included only if the corresponding system binary exists;
otherwise it's skipped.
- Windows gets just `processes` (no portable way to grab another
process's stack).
### Safety
- Cross-platform: only `sysinfo` (an existing workspace dep) is on the
always-compiled path. All `sample`/`lsof`/`/proc` code is behind
`#[cfg(target_os = ...)]` gates, so Windows builds never see those
symbols.
- Every fallible step is handled individually: on error it logs a
warning and the corresponding key is omitted from the JSON. The queue
dump is built and shown the same way whether `gather()` returned a
populated object, an empty object, or partial data.
- Diagnostics gather runs under `cx.background_spawn(...)` so the macOS
`sample` 2-second wait can't block the foreground.
- `sample`/`lsof` output is truncated to 64 KB per process at a UTF-8
char boundary.
Release Notes:
- N/A
Adds a command to help debugging stuck git job queues
Release Notes:
- N/A or Added/Fixed/Improved ...
---------
Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Cole Miller