$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f33-build-531210-64741/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f33-build-531210-64741/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard 8d7d533c90fc928c9b28d9dd1c7e81ac3ba65e04
HEAD is now at 8d7d533 Fixing package requires/provides the same way as provided by kalev for Firefox