$ git clone -n https://src.fedoraproject.org/rpms/mtools.git /var/lib/mock/f42-build-side-1-3522722-46188/root/chroot_tmpdir/scmroot/mtools
Cloning into '/var/lib/mock/f42-build-side-1-3522722-46188/root/chroot_tmpdir/scmroot/mtools'...
$ git fetch origin f2a40b9ebe3ab5dfec22c18a96034798438b10ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtools
 * [new ref]         f2a40b9ebe3ab5dfec22c18a96034798438b10ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2a40b9 Update to 4.0.48 (#2347112)