$ git clone -n https://src.fedoraproject.org/rpms/firefox.git /var/lib/mock/f40-build-768893-125430/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/f40-build-768893-125430/root/chroot_tmpdir/scmroot/firefox'...
$ git reset --hard 6b33407501dc542833a5dd69915dd8d714a2dcab
HEAD is now at 6b33407 Disabled DBus activations