fix(server): enable git core.longpaths on Windows - #6327
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe Git VCS driver now builds Git subprocess environments through ChangesWindows Git long-path support
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to Windows Git subprocesses now enable long-path support without modifying user Git configuration, addressing worktree and checkpoint operations involving paths beyond MAX_PATH. No current merge-readiness risk remains. Sequence Diagram(s)sequenceDiagram
participant GitVcsDriver
participant GitVcsDriverCore
participant gitCommandEnv
participant Git
GitVcsDriver->>GitVcsDriverCore: execute Git command
GitVcsDriverCore->>gitCommandEnv: merge environments and configure Windows long paths
gitCommandEnv-->>GitVcsDriverCore: return subprocess environment
GitVcsDriverCore->>Git: capture or restore checkpoint
Git-->>GitVcsDriver: return command result
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This focused fix injects core.longpaths=true into every Windows Git subprocess, affecting existing worktree, checkpoint, and workspace behavior while leaving user configuration unchanged. The extensive tests cover configuration preservation and long-path restoration, but the global default behavior change warrants explicit review. Not approved because:
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CDVolvik
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Ran the suite on Linux (WSL2 Ubuntu, Node 24): 56/56 in GitVcsDriverCore.test.ts, including the two new describe blocks.
The GIT_CONFIG_* approach reads well. Reusing the inherited count key case-insensitively and bailing on a non-numeric count are both the kind of thing that usually gets found later by someone with a weird environment, so nice to see them handled up front. Spreading process.env into spawnEnv rather than replacing it also avoids the failure mode that sank an earlier attempt at Windows env work in this repo, where the passed env replaced the parent's instead of extending it.
The objection I expected to have was the downstream half: if git can now create paths past MAX_PATH, can the server still clean them up, given the worktree removal path goes through Node rather than git. That turns out to be a non-issue, so recording the check here so nobody has to redo it.
On Windows with the OS-level LongPathsEnabled registry value set to 0, against a 348-character path:
target path length: 348
fs.mkdirSync recursive OK
fs.writeFileSync OK
fs.statSync OK
fs.readdirSync(parent) OK
fs.rmSync recursive (root) OK
root still exists: false
libuv prefixes \\?\ internally, so Node's fs is not bound by MAX_PATH regardless of the registry setting. Enabling core.longpaths therefore does not create a class of path the server can write but not remove, which is the thing that would have made this worse rather than better.
One cross-reference worth having on the thread: the stranding behaviour described in the doc comment, where git drops its administrative record before deleting files and a partial delete leaves a directory git worktree list can no longer see, is the same end state reported in #5614, arrived at from a different cause (a removal timeout rather than MAX_PATH). Whoever picks up either one probably wants to know about the other, since the recovery problem is shared even though the trigger is not.
Git on Windows refuses to create or delete a path longer than MAX_PATH
(260) unless core.longpaths is set. The OS-level LongPathsEnabled setting
does not cover it: git opts in per repository, and it is off by default.
Worktrees are where this bites. A worktree base path is longer than the
repository root, so a repository that clones fine can still fail to check
out into a worktree, and fail to be removed afterwards. Removal is the
worse half: git drops its administrative record before deleting files, so
a partial delete strands the directory where `git worktree list` can no
longer see it.
Measured on Windows 11 (git 2.52, LongPathsEnabled=1, core.longpaths
unset at every scope):
git worktree add into a 268-char target
error: unable to create file ...: Filename too long
fatal: Could not reset index file to revision 'HEAD'
the same command with core.longpaths=true
exit 0, checkout complete
git worktree remove --force over a pnpm node_modules tree
fails in 7s with "Filename too long", after git has already
deregistered the worktree, leaving 206k files behind
The config is injected per invocation through GIT_CONFIG_* rather than
argv, so it reaches every git subcommand without changing the command
line and nothing is written to the user's config. It is appended after
any inherited GIT_CONFIG_COUNT entries so a caller's own injected config
keeps working, and a GIT_CONFIG_COUNT that is not a count is left alone
rather than overwritten, so git still reports it.
Closes pingdotgg#635
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Windows environment variable names ignore case, but spreading process.env keeps the host's casing, so an inherited git_config_count was treated as absent. The helper then added GIT_CONFIG_COUNT=1 beside it, spawn kept only one of the case-duplicated entries, and the caller's GIT_CONFIG_* entries were silently dropped. Locate the count case-insensitively and reuse its name when incrementing. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Inline comments:
In `@apps/server/src/vcs/GitVcsDriverCore.ts`:
- Line 817: Normalize GIT_CONFIG_COUNT case-insensitively before applying
overrides: in GitVcsDriverCore, remove all case variants from spawnEnv and add
one normalized count before windowsLongPathConfigEnv; apply the same
normalization when merging process and caller environments in GitVcsDriver. Add
a regression test covering conflicting key casing and values across both
environment sources.
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apps/server/src/vcs/GitVcsDriver.test.tsapps/server/src/vcs/GitVcsDriver.tsapps/server/src/vcs/GitVcsDriverCore.test.tsapps/server/src/vcs/GitVcsDriverCore.ts
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2 participants
Windows worktree paths can exceed MAX_PATH even when the original checkout fits, causing checkout and checkpoint operations to fail with "Filename too long".
Enable core.longpaths per Git subprocess on Windows in both command paths: GitVcsDriverCore for worktree operations, and GitVcsDriver for checkpoints and workspace commands. Append the setting after inherited GIT_CONFIG_* entries, normalize count keys case-insensitively so caller overrides take precedence, and leave malformed counts for Git to reject. Nothing is written to the user's Git configuration.
The tests query real Git with inherited longpaths=false, preserve an unrelated setting, and cover both command paths on simulated Windows and Linux. A checkpoint test captures and restores a file whose absolute path exceeds 260 characters. Helper tests cover inherited counts, casing, leading whitespace, optional plus signs, and malformed values including trailing whitespace.
The related removal timeout was fixed separately in #3902. The longpaths setting added by #9570 applies only to test fixtures; these tests override it so it cannot mask missing production configuration.
Closes #635.
Validation on Windows:
Model: GPT-6 in Codex. Adversarial review: Claude Fable 5.1 in Claude Code.
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