#!/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"
sfile="$mmotm/series"
cpwd=$(pwd)

[ -f "$mmotm/broken-out/origin.patch" ] &&
	base=$(sed -n '1s/^GIT *\([^ ]*\).*$/\1/p' "$mmotm/broken-out/origin.patch")
[ "$base" ] || {
	base=$(tail -n 1 "$mmotm/.DATE")
	base=${base#v}
	base="v${base}"
}
nbase=$(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 "../tmp-akpm" ] && {
	log "akpm import directory already exists"
	exit 1
}

execute git worktree add -b tmp-akpm/master ../tmp-akpm "$db"

log '$' cd ../tmp-akpm
cd ../tmp-akpm
execute git branch tmp-akpm/current-base

sed_exp='
/NEXT_PATCHES_START/,/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)
		execute git branch tmp-akpm/current
		execute git merge --no-edit --no-stat "$dnb"
		execute git branch tmp-akpm/master-base
		;;
	*)
		execute git am -s --patch-format=mbox "$mmotm/broken-out/$f"
		;;
	esac
done

log '$' cd $cpwd
cd $cpwd

execute rm -rf ../tmp-akpm
execute git worktree prune

for i in akpm/current akpm/current-base akpm/master akpm/master-base; do
	execute git branch -f $i tmp-$i
	execute git branch -D tmp-$i
done

exit 0