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#!/bin/bash

# rpmdev-packager -- guess rpm packager info from various sources
#
# Copyright (c) 2009 Ville Skyttä <ville.skytta at iki.fi>
#
# 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

version()
{
    cat <<EOF
rpmdev-packager version 1.1

Copyright (c) 2009 Ville Skyttä <ville.skytta at iki.fi>
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.
EOF
}

help()
{
    cat <<\EOF
rpmdev-packager guesses rpm packager info from various sources:

  $RPM_PACKAGER   from environment (full name + email address)
  %packager       from rpm configuration (full name + email address)
  /etc/passwd     gecos (full name)
  certificates    ~/.fedora.cert (email address)
  $MAILTO         from environment (email address)

EOF
    usage
    echo ""
    echo "Report bugs at <https://bugzilla.redhat.com/>, component rpmdevtools,"
    echo "or at <https://fedorahosted.org/rpmdevtools/>."
}

usage() {
    cat <<EOF
Usage: rpmdev-packager [option]...

Options:
  -h, --help      Show help message and exit.
  -v, --version   Print version information and exit.
EOF
}

while [ -n "$1" ] ; do
    case "$1" in
        -h|--help)
            help
            exit 0
            ;;
        -v|--version)
            version
            exit 0
            ;;
        *)
            usage
            exit 1
            ;;
    esac
done

fullname="$( getent passwd $( id -un ) 2>/dev/null | cut -d: -f5 )"
certs=(~/.fedora.cert)

# Try $RPM_PACKAGER
packager="$RPM_PACKAGER"

# Try rpm %packager
[ -z "$packager" ] && packager="$( rpm --eval '%packager' )"
[ "$packager" = "%packager" ] && packager=

# Try packager certificates
if [ -z "$packager" ] ; then
    for cert in $certs ; do
        if [ -f "$cert" ] ; then
            packager="$( openssl x509 -noout -email -in "$cert" 2>/dev/null )"
            [ -n "$packager" -a -n "$fullname" ] && \
                packager="$fullname <$packager>"
            [ -n "$packager" ] && break
        fi
    done
fi

# Try $MAILTO
if [ -z "$packager" ] ; then
    packager="$MAILTO"
    [ -n "$packager" -a -n "$fullname" ] && packager="$fullname <$packager>"
fi

# Fall back to full name only
[ -z "$packager" ] && packager="$fullname"

# Done
[ -n "$packager" ] && echo "$packager"