$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gtk3.git /var/lib/mock/f31-build-114960-34483/root/chroot_tmpdir/scmroot/rubygem-gtk3
Cloning into '/var/lib/mock/f31-build-114960-34483/root/chroot_tmpdir/scmroot/rubygem-gtk3'...
$ git reset --hard 56b409d54d49b97622741525719507fd78f6528d
HEAD is now at 56b409d 3.3.7