$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Unit.git /var/lib/mock/f39-build-1435222-31978/root/chroot_tmpdir/scmroot/perl-Test-Unit
Cloning into '/var/lib/mock/f39-build-1435222-31978/root/chroot_tmpdir/scmroot/perl-Test-Unit'...
$ git fetch origin 685050bb8da4c1b4fb9af09481b2be4ec74ad0ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Unit
 * [new ref]         685050bb8da4c1b4fb9af09481b2be4ec74ad0ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 685050b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild