$ git clone -n https://src.fedoraproject.org/rpms/gperf.git /var/lib/mock/f39-build-1462007-33295/root/chroot_tmpdir/scmroot/gperf
Cloning into '/var/lib/mock/f39-build-1462007-33295/root/chroot_tmpdir/scmroot/gperf'...
$ git fetch origin 67c06d0396c151a81bc028a31e691f05644bc26e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gperf
 * [new ref]         67c06d0396c151a81bc028a31e691f05644bc26e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67c06d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild