$ git clone -n https://src.fedoraproject.org/rpms/m1n1.git /var/lib/mock/f38-build-728037-100999/root/chroot_tmpdir/scmroot/m1n1
Cloning into '/var/lib/mock/f38-build-728037-100999/root/chroot_tmpdir/scmroot/m1n1'...
$ git fetch origin dfaaba581fe655e52ea34405dd2ee2d6a3a47153:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/m1n1
 * [new ref]         dfaaba581fe655e52ea34405dd2ee2d6a3a47153 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfaaba5 Update to 1.2.9; Fixes: RHBZ#2212155