$ git clone -n https://src.fedoraproject.org/rpms/guichan.git /var/lib/mock/f41-build-1021561-18027/root/chroot_tmpdir/scmroot/guichan
Cloning into '/var/lib/mock/f41-build-1021561-18027/root/chroot_tmpdir/scmroot/guichan'...
$ git fetch origin d693fd525a9f22fd81e43fcfabd44f4c04643374:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guichan
 * [new ref]         d693fd525a9f22fd81e43fcfabd44f4c04643374 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d693fd5 Eliminate use of obsolete %patchN syntax (#2283636)