$ git clone -n https://src.fedoraproject.org/rpms/perl-Module-Build-Using-PkgConfig.git /var/lib/mock/f45-build-24758-606/root/chroot_tmpdir/scmroot/perl-Module-Build-Using-PkgConfig
Cloning into '/var/lib/mock/f45-build-24758-606/root/chroot_tmpdir/scmroot/perl-Module-Build-Using-PkgConfig'...
$ git fetch origin 280b69f98ea88a1f63ebc34028842982c32628e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Module-Build-Using-PkgConfig
 * [new ref]         280b69f98ea88a1f63ebc34028842982c32628e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 280b69f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild