#!/bin/bash -u

#

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

#

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

usage() {

    echo ''                                               >&2

    echo "$0 [-hrcq] [-b branch]"                         >&2

    echo ''                                               >&2

    echo ' Finds all possible srpms for a given repo'     >&2

    echo ' based on the commit log'                       >&2

    echo ''                                               >&2

    echo 'You need to run this from inside a sources git repo' >&2

    echo ''                                               >&2

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

    echo ' -r: Use the Redhat commits only'               >&2

    echo ' -c: Return in sha:srpm format'                 >&2

    echo ' -q: Suppress warnings'                         >&2

    echo ''                                               >&2

    echo ' -b: specify a branch to examine'               >&2

    echo "     defaults to repo's current branch"         >&2

    echo ''                                               >&2

    echo "  $0"                                           >&2

    echo "  $0 -b c7"                                     >&2

    echo "  $0 -r -b c7"                                  >&2

    echo "  $0 -c -b remotes/origin/c7"                   >&2

    echo "  $0 -c -r -b remotes/origin/c7"                >&2

    exit 1

}

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

warn () {

    [[ ${QUIET} -eq 1 ]] && return

    echo 1>&2 "$@"

}

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

RHELAUTHOR="CentOS Buildsys <bugs@centos.org>"

RHELONLY=0

QUIET=0

WITHCOMMITHASH=0

BRANCH=""

# for setting any overrides, such as RHELAUTHOR or default BRANCH

if [ -f /etc/centos-git-common ]; then

  . /etc/centos-git-common

fi

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

# setup args in the right order for making getopt evaluation

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

# utilizing 'while' construct rather than 'for arg' to avoid unnecessary

# shifting of program args

args=$(getopt -o hrcqb: -- "$@")

eval set -- "$args"

while [[ 0 -eq 0 ]]; do

    case $1 in

        -- )

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

            shift

            break

           ;;

         -r )

            # Only look at commits by RHEL

            RHELONLY=1

            shift

           ;;

         -c )

            # return with the commit hash as a prefix of the resulting srpm

            WITHCOMMITHASH=1

            shift

           ;;

         -q )

            # suppress warnings

            QUIET=1

            shift

           ;;

         -b )

            # Check this particular branch 

            BRANCH=$2

            shift

            shift

           ;;

         -h )

            # get help

            usage

           ;;

    esac

done

if [[ ! -d .git ]] || [[ ! -d SPECS ]]; then

    echo 'You need to run this from inside a sources git repo' >&2

    exit 1

fi

LOGARGS="--pretty='%H|%s'"

if [[ ${RHELONLY} -eq 1 ]]; then

    LOGARGS="${LOGARGS} --author='${RHELAUTHOR}'"

fi

if [[ "x${BRANCH}" != 'x' ]]; then

    LOGARGS="${LOGARGS} ${BRANCH}"

fi

loglist="$(eval "git log ${LOGARGS}" | grep import)"

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

    exit 1

fi

# split loglist on newline

splitloglist()

{

    local IFS=$'\n'

    loglist=($loglist)

}

splitloglist

# flag for if nothing is found

FOUND=False

for entry in "${loglist[@]}"; do

    FOUND=True

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

    # strip .src.rpm if present

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

    if [[ ${WITHCOMMITHASH} -eq 1 ]]; then

        shasum=$(echo "${entry}" | cut -d'|' -f1)

        echo "${shasum}:${nvr}.src.rpm"

    else

        echo "${nvr}.src.rpm"

    fi

done

if [ "${FOUND}" != "True" ]; then

    warn "No SRPMs found"

fi