$ git clone -n https://src.fedoraproject.org/rpms/firefox.git /var/lib/mock/f40-build-766573-124288/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/f40-build-766573-124288/root/chroot_tmpdir/scmroot/firefox'...
$ git reset --hard 2714c26204582b6a9e3058c26f4c4caecabbe31b
HEAD is now at 2714c26 Updated changelog