$ git clone -n https://src.fedoraproject.org/rpms/libgcroots.git /var/lib/mock/f31-build-58580-28470/root/chroot_tmpdir/scmroot/libgcroots
Cloning into '/var/lib/mock/f31-build-58580-28470/root/chroot_tmpdir/scmroot/libgcroots'...
$ git reset --hard f3ef16426ac86741c83e26112609f4ae5cd79d6a
HEAD is now at f3ef164 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild