#!/bin/bash

#cp /dev/null ../quilt-import.log

log()
{
	echo "$@" | tee -a ../quilt-import.log
}

execute()
{
	log "$" $@
	"$@" 2>&1 | tee -a ../quilt-import.log
	[ ${PIPESTATUS[0]} -eq 0 ] || sh -i || {
		[ -f "$sfile.orig" ] &&
			mv -f "$sfile.orig" "$sfile"
		exit 1
	}
}

quilters=$(grep -v '^#' ../real_control | awk -F '	' '$2=="quilt" { print $3; }')

for name in $quilters; do

	# don't bother importing things that haven't changed
	change_size=$(cd ../quilt;git diff last_merge.. -- "$name/" | wc -c)
	[ $change_size -eq 0 ] && {
		log "Unchanged quilt series $name"
		continue
	}

	sfile="../quilt/$name/series"
	base=$(sed -n 's/^#[ 	]*NEXT_BASE[ 	]*\(.*\)[ 	]*$/\1/p' "$sfile")
	if [ -n "$base" ]; then
		base=$(grep -v '^#' ../real_control | awk -F '	' '$3=="'"$base"'" { if ($2=="quilt") printf("quilt/%s", "'"$base"'"); else printf("%s/%s", "'"$base"'", $5); }')
	else
		base=$(sed -n 's/^#[ 	]*BASE[ 	]*\(.*\)[ 	]*$/\1/p' "$sfile")
		[ -n "$base" ] || {
			# for stgit
			base=$(sed '1{s/^#.*GIT commit \(.*\)$/\1/;q}' "$sfile")
			[ -n "$base" ] ||
				base="origin/master"
		}
	fi
	rbase="$base"
	case "$base" in
	*-git[0-9]*)	rbase=$(wget -q -O - "http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-${base}.id")
			;;
	commit*)	rbase=$(expr "$base" : "commit[ 	]*\(.*\)")
			;;
	[0-9]*.*)	rbase="v$base"
			;;
	esac
	log "Importing $name based on $base"
	rbase_sha1=$(git rev-parse --verify "$rbase^{commit}") || {
		log "Unknown BASE"
		continue
	}
	mv -f "$sfile" "$sfile.orig"
	if grep -q NEXT_PATCHES "$sfile.orig"; then
		do_echo=:
		while read line; do
			case $line in
			*NEXT_PATCHES_START*)	do_echo=echo
						;;
			*NEXT_PATCHES_END*)	do_echo=:
						;;
			esac
			$do_echo $line
		done <"$sfile.orig" >"$sfile"
	else
		cp "$sfile.orig" "$sfile"
	fi

	git show-ref --quiet --verify "refs/heads/quilt/$name" ||
		execute git branch "quilt/$name" "$rbase_sha1"

	mv -f "$sfile" "$sfile.tmp"
	sed -e '/^[ 	]*$/d' -e '/^[ 	]*#/d' <"$sfile.tmp" >"$sfile"
	rm -f "$sfile.tmp"
	[ -s "$sfile" ] || {
		log "	quilt series is empty"
		[ -f "$sfile.orig" ] &&
			mv -f "$sfile.orig" "$sfile"
		execute git update-ref "refs/heads/quilt/$name" "$rbase_sha1"
		continue
	}

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

	log '$' cd ../quilt-tmp
	cd ../quilt-tmp
	execute git reset --hard "$rbase_sha1"

	author=$(grep -v '^#' ../real_control | awk -F '	' '$3=="'"$name"'" { printf("%s", $1); }' | sed 's/,.*$//')
	execute git quiltimport --author "$author" --patches "../quilt/$name"

	log '$' cd ../next
	cd ../next

	execute git fetch -f ../quilt-tmp master:"quilt/$name"

	[ -f "$sfile.orig" ] &&
		mv -f "$sfile.orig" "$sfile"
done

[ -d "../quilt-tmp" ] &&
	rm -rf ../quilt-tmp

( cd ../quilt; git update-ref refs/heads/last_merge HEAD )

exit 0