#!/bin/bash

STABLE_VERSION=""
EMAIL_ADDRESS='<gregkh@linuxfoundation.org>'

REAL_SCRIPT=$(realpath -e "${BASH_SOURCE[0]}")
SCRIPT_TOP="${SCRIPT_TOP:-$(dirname "${REAL_SCRIPT}")}"

extract_addr()
{
	read l
	read l
	read l
	read l
	a=$(echo "$l" | sed -n -e 's/.*<\(.*@[^>]*\).*/\1/p')
	echo $a
}

if [ x"$EMAIL_ADDRESS" = x ]
then
	echo "You must set the EMAIL_ADDRESS environment variable to your email address"
	exit 1
fi
FROM=$EMAIL_ADDRESS

TO=""
CC=""
STABLE='<stable@vger.kernel.org>'
STABLE_COMMITS='<stable-commits@vger.kernel.org>'

author()
{
        first_author=""
        TXT=$2
        if [ ! -f $TXT ]
        then
                echo "$TXT is missing"
                exit 1
        fi
        author=""
        while read l
        do
		# skip the Message-ID: line so we don't send email to the wrong place
		#echo "$l"
		reply=$(echo "$l" | grep -i Message-ID:)
		if [ x"$reply" != x ]
		then
			continue
		fi

		# if this is the start of the diff, then it's time to stop looking
		diff=$(echo "$l" | grep "^--- ")
		if [ x"$diff" != x ]
		then
			#echo "diffstart!!!!!"
			break
		fi

                for x in $l
                do
                        a=$(echo "$x" | sed -n -e 's/.*<\(.*@[^>]*\).*/\1/p')
                        if [ x"$a" != x ]
                        then
                                if [ x"$author" == x ]
                                then
                                        author=$a
                                        first_author=$a
                                else
                                        author="$author $a"
                                fi
                        fi
                done
        done < $TXT
        author=$(echo "$author" | tr ' ' '\n' | grep -v "$first_author" |
                sort | uniq)
        author="$first_author $author"
        eval $1=$(echo $author | sed -e 's/ /,/g')
        if [ x"$3" != x ]
        then
                eval $3=$first_author
        fi
}



reply()
{
	PATCH=$1
#	patch_name=$(stripit $1)
#	PATCH=$P/patches/$patch_name.patch
#	TXT=$P/txt/$patch_name.txt
#	if [ ! -f $TXT ]
#	then
#		echo $TXT is missing
#		exit 1
#	fi
	#echo "PATCH=$PATCH"
#	SUBJECT=`grep "Subject:" $PATCH`
	SUBJECT=`grep "Subject:" $PATCH | sed s/Subject\:\ //`
#	SUBJECT=$(head -n 2 $PATCH | tail -n 1)
	MESSAGE_ID=`grep -i "^Message-ID:" $PATCH | cut -f 2 -d ' ' | cut -f 2 -d '<' | cut -f 1 -d '>'`
	author AUTHOR $1 FIRST_AUTHOR
	#echo "author said $AUTHOR"
	#echo "first_author said $FIRST_AUTHOR"
	if [ x"$AUTHOR" == "x" ]
	then
		echo "nobody to notify"
		exit 0
	fi
	to=""
	for i in $(echo "$AUTHOR" | sed -e 's/,/ /g')
	do
		if ! echo "$TO" | grep "$i"
		then
			to=$to" -to $i"
		fi
	done
	if [ x"$cc" != x ]
	then
		cc="-cc $cc"
	fi

	CHARSET=$(guess-charset "$PATCH")
	if test "x$CHARSET" = "ANSI_X3.4-1968"; then
		CHARSET=
	else
		CHARCMD="-charset=$CHARSET"
	fi

	ID=`make_message_id`

	#echo "makemail -to $AUTHOR -from=$FROM -subject=\"patch $PATCH added to gregkh tree\" -date=\"$(date -R)\" -message=$ID $CHARCMD"
	echo "sending to $AUTHOR"

	(
		echo
		echo "The patch below does not apply to the $STABLE_VERSION-stable tree."
		echo "If someone wants it applied there, or to any other stable or longterm"
		echo "tree, then please email the backport, including the original git commit"
		echo "id to <stable@vger.kernel.org>."
		echo
		echo "To reproduce the conflict and resubmit, you may use the following commands:"
		echo
		echo "git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-$STABLE_VERSION.y"
		echo "git checkout FETCH_HEAD"
		echo "git cherry-pick -x $git_id"
		echo "# <resolve conflicts, build, test, etc.>"
		echo "git commit -s"
		echo "git send-email --to '$STABLE' --in-reply-to '$ID' --subject-prefix 'PATCH $STABLE_VERSION.y' HEAD^.."
		echo
		echo "Possible dependencies:"
		echo
		echo "$(curl --fail --silent https://git.kernel.org/pub/scm/linux/kernel/git/sashal/deps.git/plain/v$STABLE_VERSION/$git_id)"
		echo
		echo "thanks,"
		echo
		echo "greg k-h"
		echo
		echo "------------------ original commit in Linus's tree ------------------"
		echo
		cat $PATCH
		echo
#		echo
#		echo -n "Patches currently in gregkh-2.6 which might be from "
#		echo "$FIRST_AUTHOR are"
#		echo
#		grep -lR $FIRST_AUTHOR /home/gregkh/linux/patches/ 2> /dev/null |
#			sed -e 's/\/home\/gregkh\/linux\/patches\///'
	) |
	makemail -to "$AUTHOR" \
		-from="$FROM" \
		-cc="$STABLE" \
		-subject="FAILED: patch \"$SUBJECT\" failed to apply to $STABLE_VERSION-stable tree" \
		-date="$(date -R)" \
		-message_id="$ID" \
		"$CHARCMD" | \
		~/bin/msmtp-enqueue.sh $to
}

git_id="$1"
shift

if [ "${git_id}" == "" ] ; then
	echo "bad_stable GIT_ID KERNEL_VERSION"
	echo "Must provide git id to be told is bad"
	exit;
fi

echo "git_id = ${git_id}"

if [ "$#" == "0" ] ; then
	versions=$("${SCRIPT_TOP}/active_kernel_versions_get.sh")
else
	versions="$*"
fi
echo "versions=${versions}"

for STABLE_VERSION in ${versions}
do
	echo "bad version = ${STABLE_VERSION}"
	TMPFILE=`mktemp bad_patch.XXXXX` || exit 1
	git show --pretty=email $git_id > $TMPFILE
	reply $TMPFILE
	rm $TMPFILE
done

#for patch_file in $*
#do
#	reply $patch_file
#	echo "acknowledged $patch_file"
#	echo "-----------------------------------------------"
#	echo
#done