$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Serializer.git /var/lib/mock/f45-build-22979-595/root/chroot_tmpdir/scmroot/perl-Data-Serializer
Cloning into '/var/lib/mock/f45-build-22979-595/root/chroot_tmpdir/scmroot/perl-Data-Serializer'...
$ git fetch origin 7947914e54ef5cfb580aab9492d2ffb34736d591:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Serializer
 * [new ref]         7947914e54ef5cfb580aab9492d2ffb34736d591 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7947914 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild