#!/bin/bash -u

#

# Extracts what appears to be the value of %{dist} from the commit message

#

# Might want to drop this in ~/bin/ and chmod u+x it

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

usage() {

    echo ''                                               >&2

    echo "$0 [-hr]"                                       >&2

    echo ''                                               >&2

    echo ' -h: This help message'                         >&2

    echo ' -r: Use the Redhat tag rather than centos tag' >&2

    echo ''                                               >&2

    echo '  Attempt to extract what appears to be the value of %{dist}' >&2

    echo '  from the git.centos.org commit message'       >&2

    exit 1

}

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

# setup args in the right order for making getopt evaluation

# nice and easy.  You'll need to read the manpages for more info

args=$(getopt -o hr -- "$@")

if [[ $? -ne 0 ]]; then

    usage

fi

eval set -- "$args"

RHELTAG=0

for arg in $@; do

    case $1 in

        -- )

            # end of getopt args, shift off the -- and get out of the loop

            shift

            break 2

           ;;

         -r )

            # skip any package with 'centos' in the dist area

            RHELTAG=1

           ;;

         -h )

            # get help

            usage

           ;;

    esac

done

packagename=$(basename `pwd`)

metadata=.${packagename}.metadata

if [[ ! -e ${metadata} ]] ||  [[ ! -d .git ]] || [[ ! -d SOURCES ]]; then

    echo 'You need to run this from inside a sources git repo'

    exit 1

fi

msg=$(git log --pretty=format:"%s" | grep import | head -n 1)

pkg=$(echo ${msg} | cut -d' ' -f2)

if [[ ${RHELTAG} -eq 0 ]]; then

    thispkg=$(echo ${pkg} | head -1)

elif [[ ${RHELTAG} -eq 1 ]]; then

    thispkg=$(echo ${pkg} grep -v centos | head -1)

else

    echo 'Something went terribly wrong'

    exit 1

fi

# strip .src.rpm if present

nvr1="${pkg%.src.rpm}"

#now get nvr from spec with placeholder dist

mydist="XXXjsdf9ur7qlkasdh4gygXXX"

nvr2=$(rpm --define "dist $mydist" -q --specfile "SPECS/$packagename.spec" --qf '%{n}-%{v}-%{r}\n' 2>/dev/null | head -n 1)

#use our placeholder dist to split the nvr

head=${nvr2%$mydist*}

if [ ".$head" = ".$nvr2" ]

then

    #no dist tag

    echo ""

    exit

fi

tail=${nvr2#*$mydist}

frag=${nvr1#$head}

dist=${frag%$tail}

echo "$dist"