$ git clone -n https://src.fedoraproject.org/rpms/rubygem-crass.git /var/lib/mock/f29-build-407-298/root/thebuilddir/tmp/scmroot/rubygem-crass
Cloning into '/var/lib/mock/f29-build-407-298/root/thebuilddir/tmp/scmroot/rubygem-crass'...
$ git reset --hard 160bc40a2714edffd40b571b5a356741a6f9119e
HEAD is now at 160bc40 Update to 1.0.4.