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Agent checkpointing is implemented by staging selected files to a temporary git index file, then creating a commit. To avoid checkpointing commonly-excluded files even when the user doesn't have them in their gitignore, we write a temporary override to .git/info/exclude while running the staging. However, this causes us to do an unnecessary git scan when a checkpoint happens, because in general we want to do this when `.git/info/exclude` changes (the user might have edited it). This PR fixes that by doing the staging in two steps: - First, we stage any tracked files - Then we get a list of untracked files to include and stage those explicitly. The list is obtained by running `git ls-files` with a custom ignore file in addition to the `--standard` ignores; we write that custom ignore file to a path ending in `tmp` under .git, which means that our worktree code will not start a git scan in response to its events (the same way it already works for the temporary index file). .git/info/exclude is never touched. Note that we already listed all untracked files before this PR, in order to exclude the large ones. Release Notes: - Fixed Zed doing unnecessary work when the agent created a checkpoint. |
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