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fix(nix): make nix.sh work from a git worktree - #434
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In a linked worktree .git is a file pointing at the main checkout's .git directory, which isn't visible in the container. Mount the shared git directory and the worktree at their host paths, overlay an absolute gitdir file, and trust the mounted directories inside the container. Fixes crossplane#425 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: Jonathan Ogilvie <jonathan.ogilvie@sumologic.com>
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📝 Walkthrough
Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation |
|---|---|---|
| Description check |  |
The description clearly explains the linked worktree failure, the nix.sh changes, the worktree-only Git configuration, and the validation performed. |
| Title check | |
The title is 46 characters, describes the linked Git worktree fix, and stays below the 72-character limit. |
| Linked Issues check | |
Issue #425 requires nix.sh to work from a linked Git worktree and to preserve full-clone behavior. The change detects a file-form .git, resolves the absolute worktree and common Git directories, mount… |
| Out of Scope Changes check | |
The whole-PR diff changes only nix.sh. The changes support issue #425 by handling worktree Git metadata, mounts, and ownership checks. No unrelated product or repository changes are present. |
| Breaking Changes | |
The pull request changes only nix.sh. It does not modify any file under apis/** or cmd/**, so this breaking-change check is not triggered. |
| Feature Gate Requirement | |
PASS. The pull request changes only nix.sh (+20 lines). It adds worktree-specific Git mounts, a temporary .git file, and container trust configuration. It does not change apis/** or add an exper… |
Full details: Linked Issues check
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Explanation
Issue
#425requires nix.sh to work from a linked Git worktree and to preserve full-clone behavior. The change detects a file-form .git, resolves the absolute worktree and common Git directories, mounts both at their host paths, and overlays /crossplane-cli/.git with an absolute gitdir. It enables safe.directory '*' only in worktree mode. The full-clone path does not set WORKTREE_FLAGS. The PR description also reports a successful ./nix.sh flake check from a worktree.
Full details: Feature Gate Requirement
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Explanation
PASS. The pull request changes only
nix.sh(+20 lines). It adds worktree-specific Git mounts, a temporary.gitfile, and container trust configuration. It does not changeapis/**or add an experimental product feature. No feature flag is required by this check.
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @nix.sh:
- Line 129: Update the `WORKTREE_FLAGS` Git metadata mounts so writes performed
by commands in `nix develop --command` do not leave shared Git metadata owned by
container root. Run Git writes as the host user or extend the existing ownership
repair to cover changed shared metadata, preserving the current mount behavior
needed by the command.
- Line 51: Replace the wildcard `safe.directory` entry in the Git configuration
with explicit physical paths for the mounted worktrees, passing the physical
worktree path separately as needed. Preserve Git’s ownership checks for all
other repositories.
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nix.sh
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Replace safe.directory '*' with the explicit worktree and git directory paths, and include the shared git directory in the post-run ownership repair so container-written metadata isn't left root-owned. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: Jonathan Ogilvie <jonathan.ogilvie@sumologic.com>
A Docker data root can only be used by one dockerd at a time, so a second nix.sh run on the shared volume (e.g. from another worktree) timed out waiting for containerd. Claim the first free data root slot with flock; the lock lives on an fd, so it is released when the container exits. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Signed-off-by: Jonathan Ogilvie <jonathan.ogilvie@sumologic.com>
Description of your changes
nix.shfailed immediately in a linked git worktree withfatal: not a git repository. In a worktree.gitis a file with a relativegitdir:pointing at the main checkout's.git, which isn't mounted in the container.On the host side, when
.gitis a file,nix.shnow:.gitfile with an absolutegitdir:.Inside the container, it adds
safe.directory '*'in worktree mode only, since the mounted git directories are owned by the host user and the container is ephemeral.Fixes #425
I have:
./nix.sh flake checkto ensure this PR is ready for review. (Passed from a worktree, which also exercises the fix.)🤖 Generated with Claude Code