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#!/bin/bash
# Create a patch which backports the support/ subdirectory.
# Copyright (C) 2017-2021 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
# This script does not backport the Makefile tweaks outside the
# support/ directory (which need to be backported separately), or the
# changes to test-skeleton.c (which should not be backported).
set -e
export LC_ALL=C
export GIT_CONFIG=/dev/null
export GTT_CONFIG_NOSYSTEM=0
export GIT_PAGER=
usage () {
cat >&2 <<EOF
usage: $0 {patch|commit}
EOF
exit 1
}
if test $# -ne 1 ; then
usage
fi
command="$1"
case "$command" in
patch|commit)
;;
*)
usage
;;
esac
# The upstream branch to work on.
branch=origin/master
# The commit which added the support/ directory.
initial_commit=c23de0aacbeaa7a091609b35764bed931475a16d
# We backport the support directory and this script. Directories need
# to end in a /.
patch_targets="support/ scripts/backport-support.sh"
latest_commit="$(git log --max-count=1 --pretty=format:%H "$branch" -- \
$patch_targets)"
# Simplify the branch name somewhat for reporting.
branch_name="$(echo "$branch" | sed s,^origin/,,)"
command_patch () {
cat <<EOF
This patch creates the contents of the support/ directory up to this
upstream commit on the $branch_name branch:
EOF
git log --max-count=1 "$latest_commit"
echo
git diff "$initial_commit"^.."$latest_commit" $patch_targets
echo "# Before applying the patch, run this command:" >&2
echo "# rm -rf $patch_targets" >&2
}
command_commit () {
git status --porcelain | while read line ; do
echo "error: working copy is not clean, cannot commit" >&2
exit 1
done
for path in $patch_targets; do
echo "# Processing $path" >&2
case "$path" in
[a-zA-Z0-9]*/)
# Directory.
git rm --cached --ignore-unmatch -r "$path"
rm -rf "$path"
git read-tree --prefix="$path" "$latest_commit":"$path"
git checkout "$path"
;;
*)
# File.
git show "$latest_commit":"$path" > "$path"
git add "$path"
esac
done
git commit -m "Synchronize support/ infrastructure with $branch_name
This commit updates the support/ subdirectory to
commit $latest_commit
on the $branch_name branch.
"
}
command_$command
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