$ git clone -n https://src.fedoraproject.org/rpms/mom.git /var/lib/mock/f40-build-2011831-45743/root/chroot_tmpdir/scmroot/mom
Cloning into '/var/lib/mock/f40-build-2011831-45743/root/chroot_tmpdir/scmroot/mom'...
$ git fetch origin cee244f60adb7ad0a4ed2c5bf15c66a9c7f6e4d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mom
 * [new ref]         cee244f60adb7ad0a4ed2c5bf15c66a9c7f6e4d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cee244f Resolves: fedora#2245825