git-patch-set

#!/bin/bash
#
# Create a patch set, save it in patches/patches-<date>-<baseref>
# Points patches/latest to the last created directory, so it's easy to
# git-send-email from there

readonly pre_patchset_hook=.git/hooks/pre-patch-set
readonly post_patchset_hook=.git/hooks/post-patch-set

range=${!#}

git rev-list $range > /dev/null
if [ $? -ne 0 ]; then
    echo "Failed to look up refs"
    exit 1
fi

# git rev-list will take care of searching for the git-repo
# so if we get here, we know we're inside a git repo.
while ! [ -e ".git" ]; do
    cd ..
done

readonly revs="${range/\//:}"
readonly date=`date +%Y%m%d%H%M`
readonly basedir=patches
readonly dir="patches-$date-$revs"
readonly tmplink="$basedir/latest"
readonly odir="$basedir/$dir"

if [ -e "$odir" ]; then
    echo "Directory $dir already exists. Oops."
    exit 1
fi

readonly first=`git rev-list --reverse $range | head -n 1`
readonly last=`git rev-list -n 1 $range`

if [ -x "$pre_patchset_hook" ]; then
    set -e
    ./$pre_patchset_hook $first $last
    set +e
fi

mkdir -p "$odir"
rm -f $tmplink
ln -sf $dir $tmplink

git format-patch -M -n -o $odir "$@"

if [ -x "$post_patchset_hook" ]; then
    set -e
    ./$post_patchset_hook $first $last
    set +e
fi