$ git clone -n https://src.fedoraproject.org/rpms/gammastep.git /var/lib/mock/f39-build-1623928-38999/root/chroot_tmpdir/scmroot/gammastep
Cloning into '/var/lib/mock/f39-build-1623928-38999/root/chroot_tmpdir/scmroot/gammastep'...
$ git fetch origin 5ac5b559be1c818919c2fb2da7eea16af2543d5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gammastep
 * [new ref]         5ac5b559be1c818919c2fb2da7eea16af2543d5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ac5b55 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild