$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Unit.git /var/lib/mock/f41-build-1211697-22574/root/chroot_tmpdir/scmroot/perl-Test-Unit
Cloning into '/var/lib/mock/f41-build-1211697-22574/root/chroot_tmpdir/scmroot/perl-Test-Unit'...
$ git fetch origin d98b98141bff7746ef18a13f0d178f6186288f6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Unit
 * [new ref]         d98b98141bff7746ef18a13f0d178f6186288f6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d98b981 Eliminate use of obsolete %patchN syntax (#2283636)