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#!/bin/bash
#
# Copyright (c) 2010-2011,  Intel Corporation.
# All Rights Reserved
# 
# This program is free software;  you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY;  without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
# the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program;  if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

#
# This script is intended to be used to send a patch series prepared by the
# create-pull-request script to Open Embedded and The Yocto Project, as well
# as to related projects and layers.
#

AUTO=0
AUTO_CL=0
GITSOBCC="--suppress-cc=all"

# Prevent environment leakage to these vars.
unset TO
unset CC
unset AUTO_CC
unset EXTRA_CC

usage()
{
cat <<EOM
Usage: $(basename $0) [-h] [-a] [-c] [[-t email]...] -p pull-dir 
  -a           Send the cover letter to every recipient listed in Cc and
               Signed-off-by lines found in the cover letter and the patches.
	       This option implies -c.
  -c           Expand the Cc list for the individual patches using the Cc and
               Signed-off-by lines from the same patch.
  -C           Add extra CC to each email sent.
  -p pull-dir  Directory containing summary and patch files
  -t email     Explicitly add email to the recipients
EOM
}

# Collect addresses from a patch into AUTO_CC
# $1: a patch file
harvest_recipients()
{
	PATCH=$1
	export IFS=$',\n'
	for REGX in "^[Cc][Cc]: *" "^[Ss]igned-[Oo]ff-[Bb]y: *"; do
		for EMAIL in $(sed '/^---$/q' $PATCH | grep -e "$REGX" | sed "s/$REGX//"); do
			if [ "${AUTO_CC/$EMAIL/}" == "$AUTO_CC" ] && [ -n "$EMAIL" ]; then
				if [ -z "$AUTO_CC" ]; then
					AUTO_CC=$EMAIL;
				else
					AUTO_CC="$AUTO_CC,$EMAIL";
				fi
			fi
		done
	done
	unset IFS
}

# Parse and verify arguments
while getopts "acC:hp:t:" OPT; do
	case $OPT in
	a)
		AUTO=1
		GITSOBCC="--signed-off-by-cc"
		AUTO_CL=1
		;;
	c)
		AUTO=1
		GITSOBCC="--signed-off-by-cc"
		;;
	C)
		EXTRA_CC="$OPTARG"
		;;
	h)
		usage
		exit 0
		;;
	p)
		PDIR=${OPTARG%/}
		if [ ! -d $PDIR ]; then
			echo "ERROR: pull-dir \"$PDIR\" does not exist."
			usage
			exit 1
		fi
		;;
	t)
		if [ -n "$TO" ]; then
			TO="$TO,$OPTARG"
		else
			TO="$OPTARG"
		fi
		;;
	esac
done

if [ -z "$PDIR" ]; then
	echo "ERROR: you must specify a pull-dir."
	usage
	exit 1
fi


# Verify the cover letter is complete and free of tokens
if [ -e $PDIR/0000-cover-letter.patch ]; then
	CL="$PDIR/0000-cover-letter.patch"
	for TOKEN in SUBJECT BLURB; do
		grep -q "*** $TOKEN HERE ***" "$CL"
		if [ $? -eq 0 ]; then
			echo "ERROR: Please edit $CL and try again (Look for '*** $TOKEN HERE ***')."
			exit 1
		fi
	done
else
	echo "WARNING: No cover letter will be sent."
fi

# Harvest emails from the generated patches and populate AUTO_CC.
if [ $AUTO_CL -eq 1 ]; then
	for PATCH in $PDIR/*.patch; do
		harvest_recipients $PATCH
	done
fi

AUTO_TO="$(git config sendemail.to)"
if [ -n "$AUTO_TO" ]; then
	if [ -n "$TO" ]; then
		TO="$TO,$AUTO_TO"
	else
		TO="$AUTO_TO"
	fi
fi

if [ -z "$TO" ] && [ -z "$AUTO_CC" ]; then
	echo "ERROR: you have not specified any recipients."
	usage
	exit 1
fi


# Convert the collected addresses into git-send-email argument strings
export IFS=$','
GIT_TO=$(for R in $TO; do echo -n "--to='$R' "; done)
GIT_CC=$(for R in $AUTO_CC; do echo -n "--cc='$R' "; done)
GIT_EXTRA_CC=$(for R in $EXTRA_CC; do echo -n "--cc='$R' "; done)
unset IFS

# Handoff to git-send-email. It will perform the send confirmation.
# Mail threading was already handled by git-format-patch in
# create-pull-request, so we must not allow git-send-email to
# add In-Reply-To and References headers again.
PATCHES=$(echo $PDIR/*.patch)
if [ $AUTO_CL -eq 1 ]; then
	# Send the cover letter to every recipient, both specified as well as
	# harvested. Then remove it from the patches list.
	# --no-thread is redundant here (only sending a single message) and
	# merely added for the sake of consistency.
	eval "git send-email $GIT_TO $GIT_CC $GIT_EXTRA_CC --confirm=always --no-thread --suppress-cc=all $CL"
	if [ $? -eq 1 ]; then
		echo "ERROR: failed to send cover-letter with automatic recipients."
		exit 1
	fi
	PATCHES=${PATCHES/"$CL"/}
fi

# Send the patch to the specified recipients and, if -c was specified, those git
# finds in this specific patch.
eval "git send-email $GIT_TO $GIT_EXTRA_CC --confirm=always --no-thread $GITSOBCC $PATCHES"
if [ $? -eq 1 ]; then
	echo "ERROR: failed to send patches."
	exit 1
fi