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#!/bin/bash
# Copyright (c) 2006 Mauro Carvalho Chehab (mchehab@infradead.org)
# This code is placed under the terms of the GNU General Public License
#
#This script is capable to mass import patches on a mbox file, test for it, allow
#comment editing and applying it.
#
#This script requires:
#1) git, since it uses gitimport to break a mbox into patches;
#2) hg mailqueue. It is easier to manage patches using mq, allowing to work with
#   the patches before applying to the tree.

#uncomment to use mq
#usemq=1

#uncomment to stop at the first error while testing a patch with --dry-run
#exitonerror=1

head=v4l/scripts/hghead.pl

if [ "$1" == "" ]; then
	echo "Usage: $0 <mbox>"
	exit
fi
MBOX=$1

if [ "$TMPDIR" == "" ]; then
        TMPDIR=/tmp
fi

DIR=$TMPDIR/mailimport$$
mkdir $DIR
if [ "$?" != "0" ]; then
        echo "*** Error at mkdir $DIR"
        exit;
fi
trap "rm -rf $DIR" EXIT
TMP2=$DIR/patchheader

apply_patch () {
	next=$1
	pdir=linux

	echo patch -s -t -p1 --dry-run -l -N -d $pdir -i $next
	patch -s -t -p1 --dry-run -l -N -d $pdir -i $next
	if [ "$?" != "0" ]; then
		pdir=.
		echo patch -s -t -p1 --dry-run -l -N -d $pdir -i $next
		patch -s -t -p1 --dry-run -l -N -d $pdir -i $next
		if [ "$?" != "0" ]; then
			$head $next
			echo "*** ERROR: Patch didn't applied well"
			if [ "$exitonerror" != "" ]; then
				exit
			else
				return
			fi
		fi
	fi

	nano $next

	unset cont
	until [ "$cont" == "0" ]; do
		cont=0
		$head $next >$TMP2

		if [ "`grep '^Bad:' $TMP2`" != "" ]; then
			echo "*** ERROR: Patch bad formed. Please fix."
			sleep 1
			nano $next
			cont=1
		fi
	done

	make whitespace

	committer=`grep "Committer:" $TMP2|sed s/"#Committer: "//`

	if [ "$usemq" != "" ]; then
		name=`cat $next | perl -ne '
			if (s/Subject:\s+(.*)/$1/) {
				m/\s*(.*)\s*\n/;
				$_="$1";

				tr/[A-Z]/[a-z]/;
				s/[^a-z0-9]/_/g;
				s/_+$//;
				s/_+/_/g;
				s/^v4l_dvb_\d+[a-z]*_//g;

				printf "%s.patch",$_;
				exit;
			}'`

		cat $next| grep -v "^#" >$TMPDIR/$name

		echo hg -m "`cat $TMP2|grep -v "^#"`" qnew $name
		hg qnew -m "`cat $TMP2|grep -v "^#"`" $name
		hg qrefresh
	else
		patch -s -t -p1 -l -N -d $pdir -i $next
		if [ "$?" != "0" ]; then
			echo "*** ERROR at: patch -s -t -p1 -l -N -d $pdir -i $next"
			exit
		fi
		cur=`pwd`
		cd $pdir
		hg addremove `diffstat -p1 -l $next`
		if [ "$?" != "0" ]; then
			echo "*** ERROR at hg addremove"
			exit
		fi
		# Commit the changed files
		hg commit  -u "$committer" -m "`cat $TMP2|grep -v "^#"`" `diffstat -p1 -l $next`
		if [ "$?" != "0" ]; then
			echo "*** ERROR at hg commit"
			cd $cur
			exit
		fi
		cd $cur
	fi
}

echo git-mailsplit $MBOX $DIR
echo -n "Number of patches at file: "
git-mailsplit $MBOX $DIR
echo

for i in $DIR/*; do
	cat $i| git-mailinfo $DIR/msg $DIR/patch>$DIR/author
	cat $DIR/msg|grep -vi ^CC: >$DIR/msg2

	cat $DIR/author|perl -ne "if (m/Author[:]\\s*(.*)\\n/) { \$auth=\$1; } else \
		{ if (m/Email[:]\\s*(.*)\\n/) { print \"From: \$auth \<\$1\>\n\"; } else \
		{ if (m/Subject[:]\\s*(.*)\\n/) { \
		\$sub=\$1; \
		\$sub=~ s;^(media|dvb|v4l|video|drivers|[-_/: \\t])*(.*);\$2;; \
		print \"Subject: \$sub\\n\"; \
		} else  \
		{ print; } } \
		}" >$DIR/author2

	out=$DIR/patch.diff

	cat $DIR/author2

	echo "Signed-off-by: $CHANGE_LOG_NAME <$CHANGE_LOG_EMAIL_ADDRESS>" >>$DIR/msg2

	echo "cat $DIR/author2 $DIR/msg2 $DIR/patch >$out"
	cat $DIR/author2 $DIR/msg2 $DIR/patch >$out

	apply_patch $out
done