git-tmp

#!/bin/bash

set -e

ACTION="${1:-init}"
TMPDIR="$(cd "${TMPDIR:-/tmp}" && pwd)"

escape() {
  sed 's;[\\/];%;g'
}

case "$ACTION" in
  init)
    if git rev-parse --is-inside-work-tree &> /dev/null; then
      echo 'Error: already in a git work tree' >&2
      exit 1
    fi

    git init --separate-git-dir "$TMPDIR/$(pwd | escape).git" > /dev/null
    git config user.email 'tmp@localhost' > /dev/null
    git add --all > /dev/null
    git commit -n -m 'initial commit' > /dev/null
    git status
    ;;
  done)
    GIT_DIR="$(git rev-parse --git-dir)"
    TMP_GIT_DIR="$TMPDIR/$(git rev-parse --show-toplevel | escape).git"

    if ! [ "${GIT_DIR#/private}" = "${TMP_GIT_DIR#/private}" ]; then
      echo 'Error: this repo is not created by git tmp' >&2
      echo "Expected: ${TMP_GIT_DIR}" >&2
      echo "Real:     ${GIT_DIR}" >&2
      exit 1
    fi

    DOT_GIT_FILE="$(git rev-parse --show-toplevel)/.git"
    echo "rm -f '$DOT_GIT_FILE'"
    rm -f "$DOT_GIT_FILE"
    echo "rm -rf '$GIT_DIR'"
    rm -rf "$GIT_DIR"
    ;;
  *)
    echo "ckb tmp init|done"
    ;;
esac

Sometimes, I want to do batch replace in the directory not tracked by git.

This script helps me to preview the changes and rollback when things go wrong by creating a temporary git repo.