$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Refcount.git /var/lib/mock/f45-build-26770-619/root/chroot_tmpdir/scmroot/perl-Test-Refcount
Cloning into '/var/lib/mock/f45-build-26770-619/root/chroot_tmpdir/scmroot/perl-Test-Refcount'...
$ git fetch origin 043f7d6f3ecfc61482872edb0c404903573c67b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Refcount
 * [new ref]         043f7d6f3ecfc61482872edb0c404903573c67b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 043f7d6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild