$ git clone -n https://src.fedoraproject.org/rpms/mxdatagenerator.git /var/lib/mock/f45-build-53276-920/root/chroot_tmpdir/scmroot/mxdatagenerator
Cloning into '/var/lib/mock/f45-build-53276-920/root/chroot_tmpdir/scmroot/mxdatagenerator'...
$ git fetch origin dc2ff4660b10a8e0f04b671d1a53a583d0268bbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mxdatagenerator
 * [new ref]         dc2ff4660b10a8e0f04b671d1a53a583d0268bbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc2ff46 Update to 7.14