$ git clone -n https://src.fedoraproject.org/rpms/oddjob.git /var/lib/mock/f40-build-2243140-53669/root/chroot_tmpdir/scmroot/oddjob
Cloning into '/var/lib/mock/f40-build-2243140-53669/root/chroot_tmpdir/scmroot/oddjob'...
$ git fetch origin b5ff59a2e1dd088a3de2388d57370a1767e6b4df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/oddjob
 * [new ref]         b5ff59a2e1dd088a3de2388d57370a1767e6b4df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5ff59a Fix build with libxml2-2.12.0