contrib/prepare-commit-msg

   1 #!/bin/sh
   2
   3 # Copyright (C) 2020 Free Software Foundation, Inc.
   4 #
   5 # This file is part of GCC.
   6 #
   7 # GCC is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3, or (at your option)
  10 # any later version.
  11 #
  12 # GCC is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with GCC; see the file COPYING.  If not, write to
  19 # the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 # Boston, MA 02110-1301, USA.
  21
  22 COMMIT_MSG_FILE=$1
  23 COMMIT_SOURCE=$2
  24 SHA1=$3
  25
  26 # We might be on a branch before the file was added.
  27 if ! [ -x contrib/mklog.py ]; then exit 0; fi
  28
  29 # Can't do anything if $COMMIT_MSG_FILE isn't a file.
  30 if ! [ -f "$COMMIT_MSG_FILE" ]; then exit 0; fi
  31
  32 # Don't do anything unless requested to.
  33 if [ -z "$GCC_FORCE_MKLOG" ]; then exit 0; fi
  34
  35 if [ -z "$COMMIT_SOURCE" ] || [ $COMMIT_SOURCE = template ]; then
  36     # No source or "template" means new commit.
  37     cmd="diff --cached"
  38
  39 elif [ $COMMIT_SOURCE = message ]; then
  40     # "message" means -m; assume a new commit if there are any changes staged.
  41     if ! git diff --cached --quiet; then
  42         cmd="diff --cached"
  43     else
  44         cmd="diff --cached HEAD^"
  45     fi
  46
  47 elif [ $COMMIT_SOURCE = commit ]; then
  48     # The message of an existing commit.  If it's HEAD, assume --amend;
  49     # otherwise, assume a new commit with -C.
  50     if [ $SHA1 = HEAD ]; then
  51         cmd="diff --cached HEAD^"
  52         if [ "$(git config gcc-config.mklog-hook-type)" = "smart-amend" ]; then
  53             # Check if the existing message still describes the staged changes.
  54             f=$(mktemp /tmp/git-commit.XXXXXX) || exit 1
  55             git log -1 --pretty=email HEAD > $f
  56             printf '\n---\n\n' >> $f
  57             git $cmd >> $f
  58             if contrib/gcc-changelog/git_email.py "$f" >/dev/null 2>&1; then
  59                 # Existing commit message is still OK for amended commit.
  60                 rm $f
  61                 exit 0
  62             fi
  63             rm $f
  64         fi
  65     else
  66         cmd="diff --cached"
  67     fi
  68 else
  69     # Do nothing for merge or squash.
  70     exit 0
  71 fi
  72
  73 # Save diff to a file if requested.
  74 DIFF_FILE=$(git config gcc-config.diff-file)
  75 if ! [ -z "$DIFF_FILE" ]; then
  76     tee="tee $DIFF_FILE"
  77 else
  78     tee="cat"
  79 fi
  80
  81 git $cmd | $tee | git gcc-mklog $GCC_MKLOG_ARGS -c "$COMMIT_MSG_FILE"