$ git clone -n https://src.fedoraproject.org/rpms/mc.git /var/lib/mock/f42-build-3273904-41313/root/chroot_tmpdir/scmroot/mc
Cloning into '/var/lib/mock/f42-build-3273904-41313/root/chroot_tmpdir/scmroot/mc'...
$ git fetch origin acdd0459738af49ce01326eea70cb190110344b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mc
 * [new ref]         acdd0459738af49ce01326eea70cb190110344b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acdd045 mc-4.8.33-1.fc42