Save a git repo state in a sha256sum by tracking all unmodified, modified, deleted, staged, unstaged, untracked, ignored files as well as config, notes, submodules, worktree, remotes, excludes, heads, branches, stash, hooks and packed-refs

git_repo_hash.sh

# Save repo state

git_repo_hash() {
  set -- "${1%/}" # remove trailing slash
  {
    cat "$1/.git/logs/HEAD" "$1/.git/ORIG_HEAD" "$1/.git/packed-refs" \
      "$1/.git/refs/heads/*" "$1/.git/refs/remotes/*" "$1/.git/refs/stash" \
      "$1/.git/logs/refs/stash" "$1/.git/hooks/*" "$1/.git/info/exclude" \
      "$1/.git/refs/tags/*" 2>/dev/null
    git -C "$1" ls-files --modified --deleted --others
    git -C "$1" ls-files --stage # "$1/.git/index in ASCII
    git -C "$1" config --local --list | grep -E '(user\.|core\.|remote\.)'
    git -C "$1" notes list 2>/dev/null || true
    git -C "$1" submodule status 2>/dev/null || true
    git -C "$1" worktree list 2>/dev/null || true
  } | sort | sha256sum | sed "s# -#$1#"
}

# source git_repo_hash.sh; git_repo_hash ~/src/lang/project/