$ git clone -n https://src.fedoraproject.org/rpms/rubygem-goocanvas1.git /var/lib/mock/f29-build-431-303/root/thebuilddir/tmp/scmroot/rubygem-goocanvas1
Cloning into '/var/lib/mock/f29-build-431-303/root/thebuilddir/tmp/scmroot/rubygem-goocanvas1'...
$ git reset --hard 2c1c181398eb596998ff7aa8b1d99393eb5f6116
HEAD is now at 2c1c181 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild