$ git clone -n https://src.fedoraproject.org/rpms/mepack.git /var/lib/mock/f40-build-2010433-45600/root/chroot_tmpdir/scmroot/mepack
Cloning into '/var/lib/mock/f40-build-2010433-45600/root/chroot_tmpdir/scmroot/mepack'...
$ git fetch origin 92a17c77232263d296edf011b0dbfb9a5cffc95d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mepack
 * [new ref]         92a17c77232263d296edf011b0dbfb9a5cffc95d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 92a17c7 Update to 1.1.0