#!/bin/bash

log_file=../akpm-import.log

log()
{
	echo "$@" | tee -a $log_file
}

execute()
{
	log "$" $@
	"$@" 2>&1 | tee -a $log_file
	[ ${PIPESTATUS[0]} -eq 0 ] || $SHELL -i || exit 1
}

mmotm="../../mmotm/text"
sfile="$mmotm/series"
cpwd=$(pwd)

[ -f "$mmotm/broken-out/origin.patch" ] &&
	base=$(sed -n '1s/^GIT *\([^ ]*\).*$/\1/p' "$mmotm/broken-out/origin.patch")
[ "$base" ] ||
	base=$(git describe --abbrev=0 origin/master)
nbase=$(sed -n '1s/^GIT *\([^ ]*\).*$/\1/p' "$mmotm/broken-out/linux-next.patch")
git rev-parse --verify "$base" >/dev/null || {
	log "Unknown origin BASE $base"
	exit 1
}
git rev-parse --verify "$nbase" >/dev/null || {
	log "Unknown linux-next BASE $nbase"
	exit 1
}
db=$(git describe "$base")
dnb=$(git describe --contains "$nbase")
log "Importing akpm based on $db/$dnb"

[ -d "../quilt-tmp" ] ||
	execute git clone -s -l -n -q . ../quilt-tmp

log '$' cd ../quilt-tmp
cd ../quilt-tmp
execute git checkout -b akpm/master "$db"
git branch akpm/current-base

sed_exp='
/NEXT_PATCHES_START/,/NEXT_PATCHES_END/{
	s/[ \t]*#.*NEXT_PATCHES_START[ \t]*\([^ \t]*\).*$/>\1/
	s/[ \t]*#.*NEXT_PATCHES_END.*$/</
	s/[ \t]*#.*$//
	/^[ \t]*$/!p
}
/^linux-next.patch/p'
patches=$(sed -n "$sed_exp" "$sfile")

for f in $patches; do
	case "$f" in
	origin.patch)
		;;
	linux-next.patch)
		git branch akpm/current
		execute git merge --no-edit --no-stat "$dnb"
		git branch akpm/master-base
		;;
	\>*)
		cbranch="${f#>}"
		[ "$cbranch" ] &&
			cref="$(git rev-parse --verify HEAD)"
		;;
	\<)
		[ "$cbranch" ] && {
			[ "$cref" != "$(git rev-parse --verify HEAD)" ] &&
				git branch -f "akpm/$cbranch"
			cbranch=""
		}
		;;
	*)
		execute git am --patch-format=mbox "$mmotm/broken-out/$f"
		;;
	esac
done

[ "$cbranch" ] &&
	[ "$cref" != "$(git rev-parse --verify HEAD)" ] &&
		git branch -f "akpm/$cbranch"

log '$' cd $cpwd
cd $cpwd

execute git fetch --force --no-tags ../quilt-tmp \
	refs/heads/akpm/master:refs/heads/akpm/master \
	refs/heads/akpm/master-base:refs/heads/akpm/master-base \
	refs/heads/akpm/current:refs/heads/akpm/current \
	refs/heads/akpm/current-base:refs/heads/akpm/current-base

rm -rf ../quilt-tmp

exit 0