$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f33-build-540859-65108/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f33-build-540859-65108/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard 37d1c2daa552482c2f20460cf02f0bda2029149b
HEAD is now at 37d1c2d Update to 78.8.0 build1