#! /bin/bash

# log.sh - Automate insertion of patches into a kernel rpm tree managed

# with series.conf

#

# Usage example:

#

# osc branch openSUSE:11.3/kernel-source

# osc co home:philipsb:branches:openSUSE:11.3:Update:Test/kernel-source

# mv ~/linux-2.6/driver-fix-for-something.patch .

# echo -e "\tpatches.drivers/driver-fix-for-something.patch" >> series.conf

# ./log.sh

# osc commit

#############################################################################

# Copyright (c) 2004-2006,2008-2010 Novell, Inc.

# All Rights Reserved.

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of version 2 of the GNU General Public License as

# published by the Free Software Foundation.

#

# 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, contact Novell, Inc.

#

# To contact Novell about this file by physical or electronic mail,

# you may find current contact information at www.novell.com

#############################################################################

# Construct a changes entry and commit log from a patch.

CHANGES=kernel-source.changes

trap 'rm -rf "$tmpdir"' EXIT

tmpdir=$(mktemp -d /tmp/${0##*/}.XXXXXX)

message=$tmpdir/message

log_entry() {

    local entry=$1

    echo "$entry" \

    | fmt --width 65 \

    | sed -e '1s/^/- /' -e '2,$s/^/  /' \

    >> $message

}

patch_meta() {

    local patch=$1

    subject=$(formail -c -x Subject < "$patch" \

             | sed -e 's, *\[[#/ A-Za-z0-9-]*\],,')

    subject=${subject## }

    subject=${subject%.}

    set -- $(formail -c -x References -x Reference < "$patch")

    references="$*"

}

patch_log_entry() {

    local patch=$1 subject references old_subj old_ref old_patch="$tmpdir/old"

    git show "HEAD:$patch" >"$old_patch" 2>/dev/null

    patch_meta "$old_patch"

    old_subj="$subject"

    old_ref="$references"

    patch_meta "$patch"

    local msg

    if test -z "$subject" -o "$subject" != "$old_subj"; then

        msg="$subject${references:+ ($references)}" 

    elif test "$references" != "$old_ref"; then

        if test -n "$references"; then

            msg="Update references ($references)"

        fi

    else

        msg="Refresh"

    fi

    log_entry "$patch: $msg${msg:+.}"

}

find_patches() {

       osc diff series.conf \

       | sed -n "s/^+\s*\(patches.*\)/\1/p"

}

for file in  "$@" $(find_patches); do

    dirname=$(dirname $file)

    basename=$(basename $file)

    archive=$dirname.tar.bz2

    if [ ! -f $basename ]; then

        echo "ERROR: $basename added to series.conf but doesn't exist in $PWD"

        exit 1

    fi

    if [ ! -d $dirname ]; then

        tar xvf $archive

    fi

    mv $basename $dirname

    rm $archive

    tar cfj $archive $dirname

    files[${#files[@]}]=$file

done 

if [ ${#files[@]} -eq 0 ]; then

    echo "No modified files" >&2

    exit 1

fi

for file in "${files[@]}"; do

    if [ "${file:0:1}" = - ]; then

	log_entry "${file:1}: Delete."

    else

	case "$file" in

	    config/*)

		if [ -z "$configs_updated" ]; then

		    log_entry "Update config files."

		    configs_updated=1

		fi

		;;

	    patches.*)

		patch_log_entry "$file"

		;;

	    kabi/*/symvers-* | kabi/*/symtypes-* | kabi/*/symsets-* )

		if [ -z "$symvers_updated" ]; then

		    log_entry "Update reference module symbol versions."

		    symvers_updated=1

		fi

	    	;;

	    series.conf)

		# don't log changes in there

		;;

	    *)

		log_entry "$file: "

		;;

	esac

    fi

done

if [ ! -s $message ]; then

    echo "- " >> $message

fi

if osc vc $CHANGES $message; then

    entry=$(sed -ne '1,2d' -e '/^--*$/!p' -e '/^--*$/q' $CHANGES)

    entry=${entry##$'\n'}

    entry=${entry%%$'\n'}

fi

for c in *.changes; do

    [ $c = $CHANGES ] && continue

    cp $CHANGES $c

done