$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f33-build-273506-51608/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f33-build-273506-51608/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard a28d167ec79e690721240aa5e91de9c8d52395fd
HEAD is now at a28d167 Update to 68.9.0 build1