$ git clone -n https://src.fedoraproject.org/rpms/gtk-v4l.git /var/lib/mock/f31-build-85777-31627/root/chroot_tmpdir/scmroot/gtk-v4l
Cloning into '/var/lib/mock/f31-build-85777-31627/root/chroot_tmpdir/scmroot/gtk-v4l'...
$ git reset --hard eff7906d8f220e3d399c348abf3043e5dfced008
HEAD is now at eff7906 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild