$ git clone -n https://src.fedoraproject.org/rpms/blackbox.git /var/lib/mock/f31-build-55833-28156/root/chroot_tmpdir/scmroot/blackbox
Cloning into '/var/lib/mock/f31-build-55833-28156/root/chroot_tmpdir/scmroot/blackbox'...
$ git reset --hard a4042370e823899efbae8a05cb7de15030321a31
HEAD is now at a404237 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild