gdb/generate-patches-from-git-repo.sh

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#!/bin/sh
# Generic function to print an error message and bail out.
die ()
{
echo $1 > /dev/stderr
exit 1
}
# Print usage
usage ()
{
cat <<EOF
$0 -- Generate .patch files for a RPM package from a git repository
Usage:
$0 <REPOSITORY> [<COMMIT_OR_TAG_OR_BRANCH>]
<REPOSITORY> is the directory where the rebase was performed.
<COMMIT_OR_TAG_OR_BRANCH> is the commit or tag or branch against which
the rebase was performed. It generally just needs to be provided if
the file "_git_upstream_commit" doesn't exist, or if you are doing a
rebase. This script will then use 'git merge-base' to find the most
recent common ancestor between HEAD and COMMIT_OR_TAG_OR_BRANCH.
Options are:
-h: Print this message
EOF
exit 0
}
test -f gdb.spec || die "This script needs to run from the same directory as gdb.spec."
test -z $1 && die "You need to specify the repository."
test "$1" = "-h" && usage
commit_or_tag="`cat _git_upstream_commit`"
if test ! -z "$2" ; then
commit_or_tag="$2"
fi
test -z $commit_or_tag && die "Because the '_git_upstream_commit' file doesn't exist, you need to specify a commit/tag/branch."
test -d $1 || die "$1 is not a directory."
# Remove all the current patches
for f in `cat _patch_order` ; do
git rm -f $f
done
orig_dir=`pwd`
cd $1
# If patches were uncommitted when the patches were applied,
# make sure that we're sitting at the top-most patch. Otherwise
# we'll only add patches up to the current top patch.
# It's safe to just assume stgit was used -- the push will simply
# fail.
stg push --all > /dev/null 2>&1
git name-rev $commit_or_tag
test $? -eq 0 || die "Could not find $commit_or_tag in the repository. Did you run 'git fetch'?"
idx=1
common_ancestor=`git merge-base HEAD $commit_or_tag`
test -z "$common_ancestor" && die "Could not find common ancestor between HEAD and $commit_or_tag."
temp_PATCH_file=/tmp/_gdb.spec.Patch.include
temp_patch_file=/tmp/_gdb.spec.patch.include
temp_patch_order_file=/tmp/_patch_order
rm -f $temp_PATCH_file $temp_patch_file $temp_patch_order_file
for c in `git rev-list --reverse ${common_ancestor}..HEAD` ; do
fname=`git log -1 --pretty='format:%s' $c`
test -z $fname && die "Could not determine filename for commit $c."
# Because git-format-patch generates patches with the first line
# containing the commit hash, every time we do a git-format-patch
# here we will have a different .patch file from what we had
# before, even if nothing has changed. This is bad, so we replace
# the commit hash by something constant (the string
# "FEDORA_PATCHES").
git format-patch --no-base --no-thread --no-signature --no-stat \
--keep-subject -1 --stdout $c \
| sed -e '1 s/^From [0-9a-f]\+ \(.*\)/From FEDORA_PATCHES \1/' \
-e '/^index [0-9a-f]\+\.\.[0-9a-f]\+.*$/d' > $orig_dir/$fname
(cd $orig_dir && git add $fname)
cat >> $temp_PATCH_file <<EOF
`git log -1 --pretty='format:%b' $c | sed -n 's/^;;/#/p'`
EOF
printf "Patch%03d: %s\n\n" $idx $fname >> $temp_PATCH_file
printf "%%patch -p1 -P%03d\n" $idx >> $temp_patch_file
echo $fname >> $temp_patch_order_file
idx=`expr $idx + 1`
done
cd $orig_dir
mv $temp_PATCH_file _gdb.spec.Patch.include
mv $temp_patch_file _gdb.spec.patch.include
mv $temp_patch_order_file _patch_order
echo "$common_ancestor" > _git_upstream_commit