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Git: How to re-stage the staged files in a pre-commit hook

I'm writting a git pre-commit hook.
The script could reformat some code, so it could modify the staged files.

How can I re-stage all files that are already staged ?

Solution

  • Without the pre-commit hook context, you can get a list of the staged files with the following command:

    git diff --name-only --cached

    So if you want to re-index the staged files, you can use:

    git diff --name-only --cached | xargs -l git add

    In the pre-commit hook context, you should follow the advices of David Winterbottom and stash unstaged changes before anything else.

    This technique allows you not to be worry about indexing, or alterate, a change that was not staged. So you don't have to stage all the staged files, but all the updated files:

    # Stash unstaged changes
git stash -q --keep-index

# Edit your project files here
...

# Stage updated files
git add -u

# Re-apply original unstaged changes
git stash pop -q