post-commit condensation fails on Windows bare repo worktrees (Access Denied on object rename)

[Joshua-Palamuttam]

Bug Description

post-commit condensation fails on Windows when using a bare repo + worktree layout. Entire's go-git tries to rename() a temp file over an existing loose git object, but Windows refuses because git marks loose objects as read-only (-r--r--r--).

On Linux, rename() atomically replaces the destination regardless of permissions. On Windows, rename / MoveFile fails with "Access is denied" if the destination exists and is read-only.

Error

From .entire/logs/entire.log:

{
  "level": "WARN",
  "msg": "post-commit: condensation failed",
  "component": "checkpoint",
  "error": "failed to write checkpoint metadata: failed to ensure sessions branch: failed to store tree: rename C:\worktrees-SeekOut\command-center.git\objects\pack\tmp_obj_693070780 C:\worktrees-SeekOut\command-center.git\objects\4b\825dc642cb6eb9a060e54bf8d69288fbee4904: Access is denied."
}

Root Cause

1. Git creates loose objects as read-only on Windows (-r--r--r--)
2. Entire's go-git writes a temp file to objects/pack/tmp_obj_*
3. go-git tries to rename() the temp file to the target path in objects/
4. The target already exists and is read-only — Windows blocks the rename
5. Checkpoint creation fails silently (the || true in the hook swallows it)

Repo Layout

command-center.git/          # bare repository
  objects/                   # shared object store (read-only files)
  hooks/                     # shared hooks
  main/                      # worktree
    .entire/

Workaround

We patched the post-commit hook to chmod u+w all loose objects before Entire runs:

#!/bin/sh
# Make loose objects writable before Entire's go-git tries to rename over them
git_dir=$(git rev-parse --git-common-dir 2>/dev/null)
if [ -n "$git_dir" ] && [ -d "$git_dir/objects" ]; then
    find "$git_dir/objects" -maxdepth 2 -type f \
      ! -path "*/pack/*.pack" ! -path "*/pack/*.idx" ! -path "*/pack/*.rev" \
      -exec chmod u+w {} + 2>/dev/null
fi

entire hooks git post-commit 2>/dev/null || true

Suggested Fix

In the Go code where go-git stores objects, before the rename call, either:

1. Remove the destination file if it already exists (since it's the same content)
2. Or chmod the destination to be writable before renaming

Environment

• Entire CLI (installed via go install)
• Windows 11 Pro 10.0.26100
• Git for Windows (bash shell)
• Bare repo + worktree layout via git clone --bare + git worktree add
• core.filemode = false

Related

• GetWorktreeID fails with bare repo + worktree layout (.bare/worktrees/) #431 (worktree layout issues, different root cause)
• Add native Windows support #370 (native Windows support)