$ git clone -n https://src.fedoraproject.org/rpms/glob2.git /var/lib/mock/f40-build-2442386-61030/root/chroot_tmpdir/scmroot/glob2
Cloning into '/var/lib/mock/f40-build-2442386-61030/root/chroot_tmpdir/scmroot/glob2'...
$ git fetch origin 20564216f08d0951f32473af060223cd0e88048b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glob2
 * [new ref]         20564216f08d0951f32473af060223cd0e88048b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2056421 Update release for a new build