#!/bin/bash

# Old versions of yum-builddep leave a stale yum.pid file behind.
# Remove that file if necessary after yum-builddep exits

# find yum-builddep
YUM_BUILDDEP=$(which yum-builddep 2>/dev/null)

# dnf: call it directly
if [[ -z $YUM_BUILDDEP ]] || grep -q -F dnf.cli "$YUM_BUILDDEP" ; then
    yum-builddep "$@"
    exit $?
fi


# old yum: scan command line for --installroot
ROOT_PREFIX=
YUM_CONF=/etc/yum.conf
find_root_prefix() {
    while [[ "$#" -gt 0 ]] ; do
        case "$1" in
            --installroot)
                ROOT_PREFIX="$2"
                shift
                ;;
            --installroot=*)
                ROOT_PREFIX="${1#*=}"
                ;;
            -c|--config)
                YUM_CONF="$2"
                shift
                ;;
            --config=*)
                YUM_CONF="${1#*=}"
                ;;
        esac
        shift
    done
    if [[ -z "$ROOT_PREFIX" ]] && [[ -f "$YUM_CONF" ]] ; then
        ROOT_PREFIX=$(sed -rn 's/^\s*installroot\s*=\s*(\S+)\s*$/\1/p' $YUM_CONF)
    fi
}
find_root_prefix "$@"

# ignore signals -- always wait for yum-builddep
trap "" INT TERM HUP PIPE

# run it in the background to get its PID
"$YUM_BUILDDEP" "$@" &
pid="$!"

# wait for it
wait "$pid"
res="$?"

# if yum.pid remains and contains yum-builddep's PID, delete it
if [[ -f "${ROOT_PREFIX}/run/yum.pid" ]] ; then
    lock_owner=
    read lock_owner <"${ROOT_PREFIX}/run/yum.pid" || :
    if [[ -n $lock_owner && $lock_owner == $pid ]] ; then
        rm -f "${ROOT_PREFIX}/run/yum.pid"
    fi
fi

# done
exit $res