927b001502
1111c9ac97ca0f0afeb5df45bc0970b761c3c9ff fuzz: Change LIMIT_TO_MESSAGE_TYPE from a compile-time to a run-time setting (MarcoFalke)
Pull request description:
The `process_message_${msg_type}` fuzz targets have many issues:
* In a context where each fuzz target must be a separate binary, this bloats the storage requirements by the number of message types.
* The qa-assets repo for fuzz inputs also bloats, because each input in the type specific folder (`./process_message_${msg_type}`) is accompanied by a similar input in the general folder (`./process_message`) or a in another specific folder. The size seems to be ~3GB for the sum of all folders vs 0.3GB for the general folder.
* Handling of different folders for each message type and one general folder for all message types (and unknown message types) is undocumented and unclear. Cross-pollination is encouraged, I guess, but who does it?
* It is unclear if the fuzz target has any value at all, given that any bug that is found here should also be found by the `process_messages` fuzz target, and historically always has been? So maybe it can even be removed completely in the future?
* (minor nit): When adding a new message type, the message type has to be added to this fuzz target as well.
Fix all issues by turning the compile-time setting into a run-time setting, thus removing the extra executables and fuzz folders. The same approach is also taken by the `rpc` fuzz target.
If someone wants to limit their fuzzing to a specific message type, they can still do it. For example,
```
LIMIT_TO_MESSAGE_TYPE=inv FUZZ=process_message ./src/test/fuzz/fuzz
ACKs for top commit:
dergoegge:
ACK 1111c9ac97ca0f0afeb5df45bc0970b761c3c9ff
Tree-SHA512: 9495538d9bc83b24671a44e9311a4e82ce5b2fa89e431e42772dcfa19f675a9fe2dd8cd3d3b15b154c8b7f400e57ee08a976d37e55a5425778ced0ee85fb984c
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