$ git clone -n https://src.fedoraproject.org/rpms/sjasm.git /var/lib/mock/f41-build-1041722-18988/root/chroot_tmpdir/scmroot/sjasm
Cloning into '/var/lib/mock/f41-build-1041722-18988/root/chroot_tmpdir/scmroot/sjasm'...
$ git fetch origin 441e54820a19166ed1413e052138998162608472:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sjasm
 * [new ref]         441e54820a19166ed1413e052138998162608472 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 441e548 Eliminate use of obsolete %patchN syntax (#2283636)