$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f33-build-560485-65788/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f33-build-560485-65788/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard bc6d75e2e345d6b5ba448811f01bc3a67c33223f
HEAD is now at bc6d75e Update to 78.8.1 build1