$ git clone -n https://src.fedoraproject.org/rpms/libgcroots.git /var/lib/mock/f31-build-116146-34532/root/chroot_tmpdir/scmroot/libgcroots
Cloning into '/var/lib/mock/f31-build-116146-34532/root/chroot_tmpdir/scmroot/libgcroots'...
$ git reset --hard 9283302c690246a1a90fb3ea7b5a4ac3c09dd861
HEAD is now at 9283302 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild