git.scottworley.com Git - rfc1751/blob - git-pre-commit-hook

   1 #! /usr/bin/env nix-shell
   2 #! nix-shell -i bash -p shfmt
   3 # shellcheck shell=bash
   4
   5 # Copy me to .git/hooks/pre-commit
   6
   7 set -euo pipefail
   8
   9 tmpdir=
  10 cleanup_tmpdir() {
  11   if [[ "$tmpdir" && -e "$tmpdir" ]];then
  12     rm -rf "$tmpdir"
  13   fi
  14 }
  15 trap cleanup_tmpdir EXIT
  16
  17 # Check out the git index (what's about to be committed) in a temporary
  18 # directory & run the supplied command there.
  19 in_git_index_in_tmpdir() {
  20   tmpdir=$(mktemp -d)
  21   [[ "$tmpdir" && -d "$tmpdir" ]]
  22   start_index=$(sha256sum "${GIT_INDEX_FILE:-.git/index}")
  23   git checkout-index --prefix="$tmpdir/" -a
  24   pushd "$tmpdir"
  25   "$@"
  26   popd
  27   end_index=$(sha256sum "${GIT_INDEX_FILE:-.git/index}")
  28   if [[ "$start_index" != "$end_index" ]];then
  29     echo "Index changed while pre-commit tests were running.  Aborting!"
  30     exit 1
  31   fi
  32 }
  33
  34 verify() {
  35   nix-shell --arg lint true --run './test.sh lint'
  36 }
  37
  38 in_git_index_in_tmpdir verify