/etc/system-image/config.d/20_snappy.ini is in ubuntu-core-config 0.6.40.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [hooks]
apply: ubuntucoreupgrader.apply.ApplyUpgrade
[updater]
cache_partition: /writable/cache/
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