$ git clone -n https://src.fedoraproject.org/rpms/fbrnch.git /var/lib/mock/f40-build-1812247-24896/root/chroot_tmpdir/scmroot/fbrnch
Cloning into '/var/lib/mock/f40-build-1812247-24896/root/chroot_tmpdir/scmroot/fbrnch'...
$ git fetch origin 987ca562fbbc94da26c343fde1817b4f4eb3a511:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fbrnch
 * [new ref]         987ca562fbbc94da26c343fde1817b4f4eb3a511 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 987ca56 update to 1.4