$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Lib.git /var/lib/mock/f45-build-26701-618/root/chroot_tmpdir/scmroot/perl-Test-Lib
Cloning into '/var/lib/mock/f45-build-26701-618/root/chroot_tmpdir/scmroot/perl-Test-Lib'...
$ git fetch origin d7961740b82931e5fc05fa64ad2a7f50fc66f15c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Lib
 * [new ref]         d7961740b82931e5fc05fa64ad2a7f50fc66f15c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d796174 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild