path: root/qf

#!/bin/bash

# Copyright © 2013,2014 Intel Corporation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
# Authors:
#    Daniel Vetter <daniel.vetter@ffwll.ch>

# quilt git flow script

# fail on any goof-up
set -e

#
# User configuration. Set in environment or configuration file. See
# qfrc.sample for an example.
#

# qf configuration file
QF_CONFIG=${QF_CONFIG:-$HOME/.qfrc}
if [ -r $QF_CONFIG ]; then
	# shellcheck source=/dev/null
	. $QF_CONFIG
fi

# prefix for quilt branch
QUILT_PREFIX=${QUILT_PREFIX:-quilt/}

function cd_toplevel
{
	cd $(git rev-parse --show-toplevel)

	if [ -f series ] ; then
		cd ..

		if [[ $PWD != $(git rev-parse --show-toplevel) ]] ; then
			echo No git repo in parent directory of series file
			exit 1
		fi
	fi

	if [[ -f patches/series ]] ; then
		if [[ $PWD/patches != $(cd patches ; git rev-parse --show-toplevel) ]] ; then
			echo No git repo found in quilt series directory
			exit 2
		fi
	else
		echo No quilt series file found
		exit 3
	fi
}

function quiet_pop_all
{
	echo Popping patches ...
	quilt pop -a -q "$@" > /dev/null || test $? = 2
}

function repo_check # allow-detached
{
	cd patches
	quilt_branch=$(git rev-parse --abbrev-ref HEAD)
	branch=${quilt_branch#$QUILT_PREFIX}

	if [[ ! $1 ]] ; then
		if ! git branch | grep $quilt_branch &> /dev/null ; then
			echo quilt branch not found
			exit 5
		fi

		cd ..

		if ! git branch | grep $branch &> /dev/null ; then
			echo git branch not found
			exit 6
		fi
	else
		cd ..
	fi

	# shellcheck source=/dev/null
	baseline=$(source patches/config ; echo ${BASELINE:-})

	if [[ $(git rev-parse HEAD) != "$baseline" ]] ; then
		echo Baseline commit doesn\'t match with quilt config
		exit 7
	fi
}

function checkout_baseline
{
	echo Updating baseline repo to $baseline
	if ! git checkout --detach $baseline &> /dev/null ; then
		echo Baseline checkout failed, please clean up first
		exit 10
	fi
	git reset --hard &> /dev/null
}

function repo_init
{
	# setup changes for baseline rep
	# reflog only works if there's already a file there ...
	touch .git/logs/refs/QUILT_EXPORT

	# setup for quilt patch repo
	git clone --local --no-checkout -- . patches
	cd patches
	git remote rm origin

	# include remotes and branches and all that from parent repo
	git config include.path ../../.git/config
	cd ..
}

function branch_init
{
	git config --replace-all remote.$remote.fetch \
		refs/baselines/$branch/*:refs/baselines/$branch/* \
		^refs/baselines/$branch/

	cd patches
	git config remote.$remote.fetch +refs/quilts/*:refs/remote-quilts/$remote/*
	git fetch $remote &> /dev/null

	if git rev-parse refs/remote-quilts/$remote/$branch &> /dev/null ; then
		echo Creating quilt branch $quilt_branch for existing remote
		git checkout -b $quilt_branch refs/remote-quilts/$remote/$branch
	else
		echo Creating new quilt branch $quilt_branch
		# big trickery to get an empty commit
		git checkout -q --orphan $quilt_branch > /dev/null
		git rm -rf ./* > /dev/null
		git ls-files | xargs git rm -rf > /dev/null
		touch series
		echo BASELINE=$baseline > config
		cat > .gitignore <<-HERE
		*~
		.*
		HERE
		git add series .gitignore config -f
		git commit -m "Initial quilt commit" -m "Baseline: $baseline"
	fi

	# set the quilts upstream
	git config branch.$quilt_branch.remote $remote
	git config branch.$quilt_branch.merge refs/quilts/$branch
}

function quilt_clean_check
{
	local current_top quilt_changes

	current_top=$(quilt top)

	if [[ -n $(quilt unapplied $current_top) ]] ; then
		echo Unapplied quilt patches, aborting.
		exit 9
	fi

	quilt_changes=$(cd patches ; git status --porcelain)

	if [[ -n $quilt_changes ]] ; then
		echo Uncommitted changes in the quilt patch repo, aborting.
		exit 19
	fi
}

qf=$(basename $0)

# first positional argument is the subcommand
if [ -n "$HELP" ] || [ "$#" = "0" ]; then
    subcommand="usage"
else
    subcommand="$1"
    shift
fi

function qf_setup
{
	cd $(git rev-parse --show-toplevel)

	if [[ -d patches ]] ; then
		if [[ ! -d patches/.git ]] ; then
			echo patches/ directory exists, but not initialized.
			echo Please fix manually.
			exit 11
		fi

		echo Quilt repo already set up.
	else
		repo_init
	fi

	if [[ -n $1 ]] ; then
		if ! git branch | grep $1 &> /dev/null ; then
			echo $1 is not a branch in the main repo, aborting.
			exit 13
		fi

		branch=$1
		quilt_branch=$QUILT_PREFIX$branch
		baseline=$(git rev-parse $1)
		remote=$(git config branch.$branch.remote)

		branch_init $2
	fi
}

qf_alias_co=checkout
function qf_checkout
{
	cd_toplevel

	cd patches
	# -q to avoid status checks - the strange remote situation
	# confuses git and takes forever to analyze
	if git rev-parse $1 &> /dev/null ; then
		# raw mode
		quilt_branch=$1
	else
		# quilt branch mode
		quilt_branch=$QUILT_PREFIX$1
	fi
	git checkout $quilt_branch -q
	cd ..
	# error code 2 means no patches removed, which is ok
	quiet_pop_all -f
	# shellcheck source=/dev/null
	baseline=$(source patches/config ; echo ${BASELINE:-})
	checkout_baseline
	quilt push -a -q > /dev/null
	echo Now at $(quilt top)
}

function qf_rebase
{
	cd_toplevel
	repo_check 0

	if [[ -z $1 ]] ; then
		echo No commit given
		exit 4
	fi

	new_baseline=$(git rev-parse $1)

	current_top=$(quilt top)
	quiet_pop_all
	echo Resetting baseline to $new_baseline
	git reset --hard $new_baseline
	sed -e "s/BASELINE=.*$/BASELINE=$new_baseline/" -i patches/config
	git update-ref refs/baselines/$branch/$new_baseline $new_baseline

	quilt push $current_top -q
}

function qf_refresh
{
	cd_toplevel
	repo_check 0

	changed_files=$(qf git status --porcelain | wc -l)

	if [[ $changed_files -gt 0 ]] ; then
		echo Quilt patch dir not clean, aborting
		exit
	fi

	quiet_pop_all

	while quilt push ; do
		quilt refresh
	done

	# ignore "nothing to commit"
	qf git commit -a -m "Refreshing all patches." || true
}

function qf_clean_patches
{
	cd_toplevel
	repo_check 0

	for patch in patches/{*/,/}*.patch ; do
		if grep "^${patch##patches/}$" patches/series &> /dev/null ; then
			continue
		fi
		echo No reference to $patch, deleting it.
		rm $patch
	done
}

function qf_export
{
	cd_toplevel
	repo_check 0
	quilt_clean_check

	username=$GIT_COMMMITTER_NAME
	username=${username:-$(git config user.name || true)}
	username=${username:-$(getent passwd $USER | cut -d: -f 5 | cut -d, -f 1 || true)}
	useremail=$GIT_COMMMITTER_EMAIL
	useremail=${useremail:-$(git config user.email || true)}
	useremail=${useremail:-$EMAIL}

	if [[ -z $useremail || -z $username ]] ; then
		echo User name/email not found, please fix your config
		exit 17
	fi

	echo Exporting quilt pile $branch

	quiet_pop_all

	git reset --hard
	if [[ $quilt_branch = HEAD ]] ; then
		git checkout --detach
	else
		git checkout -B $branch
	fi

	git quiltimport --author "$username <$useremail>"

	quilt_ref=$(cd patches ; git rev-parse --abbrev-ref HEAD)
	quilt_sha_abbrev=$(cd patches ; git rev-parse --short HEAD)
	quilt_sha=$(cd patches ; git rev-parse HEAD)

	git update-ref -m "export $quilt_ref:$quilt_sha_abbrev to $branch" refs/QUILT_EXPORT $(git rev-parse HEAD)
	git notes --ref quilt add -m "Quilt-Commit: $quilt_sha" $branch

	checkout_baseline

	quilt push -a -q
}

qf_alias_ev=export-visualize
function qf_export_visualize
{
	cd_toplevel
	repo_check 1

	gitk QUILT_EXPORT ^$baseline
}

function qf_push
{
	cd_toplevel
	repo_check 0
	quilt_clean_check

	remote=$(git config branch.$branch.remote)

	export_quilt_sha=$(git notes --ref=quilt show $branch | grep Quilt-Commit | cut -d ' ' -f 2)
	quilt_sha=$(cd patches ; git rev-parse $quilt_branch)

	if [[ $export_quilt_sha != "$quilt_sha" ]] ; then
		echo Quilt export is out of date, aborting
		echo $export_quilt_sha
		echo $quilt_sha
		exit 18
	fi

	cd patches
	git push $remote $quilt_branch:refs/quilts/$branch
	cd ..

	# The exported branch is a rebasing one, so force the push.
	# Everything else shouldn't ever need a force-push.
	git push $remote $branch -f

	git push $remote refs/baselines/$branch/*:refs/baselines/$branch/*
}

function qf_fetch
{
	cd_toplevel
	repo_check 0

	remote=$(git config branch.$branch.remote)

	cd patches
	git fetch $remote
	cd ..

	git fetch $remote

	git fetch $remote
}

function qf_pull
{
	cd_toplevel
	repo_check 0

	qf fetch
	cd patches

	if [[ $1 == "--rebase" ]] ; then
		git rebase "@{upstream}"
	else
		git merge "@{upstream}"
	fi

	qf co
}

function qf_stage
{
	cd_toplevel
	repo_check 1

	git reset --mixed &> /dev/null
	quilt applied 2> /dev/null | xargs git apply --cached
	echo All applied patches successfully staged
}

qf_alias_wp=wiggle_push
function qf_wiggle_push
{
	cd_toplevel

	conflict_files=$(quilt push -f | grep "saving rejects" | sed -e "s/.*saving rejects to file \(.*\)/\1/")

	if [[ $conflict_files != "" ]] ; then
		echo conflicts found!
	fi

	for file in $conflict_files ; do
		echo wiggling in ${file%.rej}:
		#cat $file
		rm -f ${file%.rej}.porig
		wiggle -r ${file%.rej} $file || true
	done
}

function qf_resolved
{
	quilt refresh
	quilt header -e
}

function qf_apply
{
	if [[ "$1" == "" ]] ; then
		echo No patch name given, aborting.
		exit
	fi
	patch_name=$1.patch
	quilt import -P $patch_name /proc/self/fd/0
	quilt push
	qf git add $patch_name
	qf patch-amend
}

qf_alias_pa=patch_amend
function qf_patch_amend
{
	cd_toplevel
	repo_check 1

	gvim $(quilt top)
}

function qf_list_unused_patches
{
	cd_toplevel
	repo_check 1

	for patch in patches/{*/,/}*.patch ; do
		if ! grep "^${patch#patches/}$" patches/series > /dev/null ; then
			if [[ "$1" != --purge ]] ; then
				echo $patch
			else
				echo deleting $patch
				rm $patch
			fi
		fi
	done
}

function qf_baseline
{
	cd_toplevel
	repo_check 1

	echo $baseline
}

qf_alias_g=git
function qf_git
{
	cd_toplevel
	cd patches
	git "$@"
}

qf_alias_k=gitk
function qf_gitk
{
	cd_toplevel
	cd patches
	gitk "$@"
}

function qf_help
{
	manpage=$(dirname $(readlink -f $0))/qf.rst
	if [ ! -e "$manpage" ]; then
		echo "Can't find the man page."
		exit 1
	fi

	if hash rst2man 2>/dev/null; then
		renderer=rst2man
		pager="man -l -"
	else
		renderer=cat
		pager=${PAGER:-cat}
	fi

	$renderer < $manpage | $pager
}

function qf_list_commands
{
	declare -F | grep -o " qf_[a-zA-Z_]*" | sed 's/^ qf_//;s/_/-/g'
}

function qf_list_aliases
{
	# use posix mode to omit functions in set output
	( set -o posix; set ) | grep "^qf_alias_[a-zA-Z0-9_]*=" |\
		sed 's/^qf_alias_//;s/=/\t/;s/_/-/g'
}

function qf_usage
{
	echo "usage: $qf SUBCOMMAND [ARGUMENTS]"
	echo
	echo "The available subcommands are:"
	if hash column 2>/dev/null; then
		qf_list_commands | column -c 72 | sed 's/^/\t/'
	else
		qf_list_commands | sed 's/^/\t/'
	fi
	echo
	echo "See '$qf help' for more information."
}

# qf subcommand aliases (with bash 4.3+)
if ! declare -n subcmd=qf_alias_${subcommand//-/_} &> /dev/null || \
		test -z "${subcmd:-}"; then
	subcmd="$subcommand"
fi

# look up the function by the subcommand name
subcmd_func=qf_${subcmd//-/_}
if ! declare -f $subcmd_func >/dev/null; then
	echo "Using qf as git command on quilt patches directory."
	cd_toplevel
	cd patches
	git "$@"
	exit $?
fi

# throw away to not confuse list-aliases
unset subcmd

$subcmd_func "$@"