$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f31-build-113249-34363/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f31-build-113249-34363/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard 3f8a092a699e3128d137b4e327b9a705ec081f63
HEAD is now at 3f8a092 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild