scripts/backport-support.sh

   1 #!/bin/bash
   2 # Create a patch which backports the support/ subdirectory.
   3 # Copyright (C) 2017-2020 Free Software Foundation, Inc.
   4 # This file is part of the GNU C Library.
   5
   6 # The GNU C Library is free software; you can redistribute it and/or
   7 # modify it under the terms of the GNU Lesser General Public
   8 # License as published by the Free Software Foundation; either
   9 # version 2.1 of the License, or (at your option) any later version.
  10
  11 # The GNU C Library is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # Lesser General Public License for more details.
  15
  16 # You should have received a copy of the GNU Lesser General Public
  17 # License along with the GNU C Library; if not, see
  18 # <https://www.gnu.org/licenses/>.
  19
  20 # This script does not backport the Makefile tweaks outside the
  21 # support/ directory (which need to be backported separately), or the
  22 # changes to test-skeleton.c (which should not be backported).
  23
  24 set -e
  25
  26 export LC_ALL=C
  27 export GIT_CONFIG=/dev/null
  28 export GTT_CONFIG_NOSYSTEM=0
  29 export GIT_PAGER=
  30
  31 usage () {
  32     cat >&2 <<EOF
  33 usage: $0 {patch|commit}
  34 EOF
  35     exit 1
  36 }
  37
  38 if test $# -ne 1 ; then
  39     usage
  40 fi
  41
  42 command="$1"
  43
  44 case "$command" in
  45     patch|commit)
  46     ;;
  47     *)
  48         usage
  49         ;;
  50 esac
  51
  52 # The upstream branch to work on.
  53 branch=origin/master
  54
  55 # The commit which added the support/ directory.
  56 initial_commit=c23de0aacbeaa7a091609b35764bed931475a16d
  57
  58 # We backport the support directory and this script.  Directories need
  59 # to end in a /.
  60 patch_targets="support/ scripts/backport-support.sh"
  61
  62 latest_commit="$(git log --max-count=1 --pretty=format:%H "$branch" -- \
  63   $patch_targets)"
  64
  65 # Simplify the branch name somewhat for reporting.
  66 branch_name="$(echo "$branch" | sed s,^origin/,,)"
  67
  68 command_patch () {
  69     cat <<EOF
  70 This patch creates the contents of the support/ directory up to this
  71 upstream commit on the $branch_name branch:
  72
  73 EOF
  74     git log --max-count=1 "$latest_commit"
  75     echo
  76     git diff "$initial_commit"^.."$latest_commit" $patch_targets
  77     echo "# Before applying the patch, run this command:" >&2
  78     echo "# rm -rf $patch_targets" >&2
  79 }
  80
  81 command_commit () {
  82     git status --porcelain | while read line ; do
  83         echo "error: working copy is not clean, cannot commit" >&2
  84         exit 1
  85     done
  86     for path in $patch_targets; do
  87         echo "# Processing $path" >&2
  88         case "$path" in
  89             [a-zA-Z0-9]*/)
  90                 # Directory.
  91                 git rm --cached --ignore-unmatch -r "$path"
  92                 rm -rf "$path"
  93                 git read-tree --prefix="$path" "$latest_commit":"$path"
  94                 git checkout "$path"
  95                 ;;
  96             *)
  97                 # File.
  98                 git show "$latest_commit":"$path" > "$path"
  99                 git add "$path"
 100         esac
 101     done
 102     git commit -m "Synchronize support/ infrastructure with $branch_name
 103
 104 This commit updates the support/ subdirectory to
 105 commit $latest_commit
 106 on the $branch_name branch.
 107 "
 108 }
 109
 110 command_$command