#!/bin/bash
# Copyright 2007 (C) Albin Tonnerre (Lutin) <lut1n.tne@gmail.com>
# License: GPLv2
#
# This script is used to update the maintainer field of an Ubuntu package
# to match the DebianMaintainerField specification.

usage() {
cat <<EOF
Usage: $0 [--path=PATH] [--section=SECTION] [--nochangelog]
--path=PATH 		specify the path of the source folder
--section=SECTION 	specify the section of the package (if the package is
			not yet in the archive.
--nochangelog		Do not add to the changelog, only alter debian/control.
EOF
}

for argv in "$@"; do
    param=${argv%=*}
    value=${argv#*=}
    case $param in
        "--path")
            path="$value"
        ;;
        "--section")
            [ "$value" != "main" ] &&
            [ "$value" != "restricted" ] &&
            [ "$value" != "universe" ] &&
            [ "$value" != "multiverse" ] && echo "Invalid section. Valid sections: main restricted universe multiverse" >&2 && exit 1
            section=$value
        ;;
        "--nochangelog")
            nochangelog=1
        ;;
        "--help")
            usage
            exit 0
        ;;
        *)
            echo "Bad parameter."
            usage
            exit 1
        ;;
    esac
done

cd ${path-.}

# look for the debian directory
if [ -f debian/control -a -f debian/changelog ]; then
    DEBIANDIR=debian
elif [ -f control -a -f changelog ]; then
    DEBIANDIR=.
else
    echo "Please execute «$0» in the source folder." >&2 && exit 1
fi

[ -n "$(head -1 $DEBIANDIR/changelog | grep -E '\(*ubuntu.*\)')" ] &&
! grep -E "^Maintainer: .*@.*ubuntu.*>" $DEBIANDIR/control >/dev/null || \
{ echo "Not an Ubuntu package or already maintained by the Ubuntu team." >&2; \
exit 1; }

if [ -z "$section" ]; then
    DISTRO=$(sed -r '1!d;s/.*\) (.*);.*/\1/' $DEBIANDIR/changelog | cut -d'-' -f1)
    pkgline=$(rmadison -u ubuntu -a source -s $DISTRO $(head -1 $DEBIANDIR/changelog | cut -d' ' -f1))
    if [ -z "$pkgline" ]; then
        echo "The package doesn't exist in the $DISTRO archive. You may have to use the" >&2
        echo "--section argument. Run $0 --help for more information." >&2
        exit 1
    fi
    section=$(echo $pkgline | grep -Eo "main|universe|multiverse|restricted") || section=main
fi
case $section in
    "main"|"restricted")        email="Ubuntu Core Developers <ubuntu-devel-discuss@lists.ubuntu.com>"  ;;
    "universe"|"multiverse")    email="Ubuntu MOTU Developers <ubuntu-motu@lists.ubuntu.com>"           ;;
    *)      echo "No section found for this package; aborting" >&2; exit 1 ;;
esac

for file in control{,.in,.real}; do
    [ -f $DEBIANDIR/$file ] && sed -ri "s/(^Maintainer:) (.*)/\1 $email\nXSBC-Original-\1 \2/" $DEBIANDIR/$file
done

[ -z "$nochangelog" ] && dch --changelog $DEBIANDIR/changelog "Modify Maintainer value to match the DebianMaintainerField specification."
echo "Maintainer changed to $email."