$ git clone -n https://src.fedoraproject.org/rpms/strace.git /var/lib/mock/f42-build-867949-175876/root/chroot_tmpdir/scmroot/strace
Cloning into '/var/lib/mock/f42-build-867949-175876/root/chroot_tmpdir/scmroot/strace'...
$ git fetch origin e9f6b08779d07ab950f264f84951603dbdd36aba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/strace
 * [new ref]         e9f6b08779d07ab950f264f84951603dbdd36aba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e9f6b08 6.13-1