[riot-notifications] [RIOT-OS/RIOT] makefiles/suit.base.inc.mk: don't clean existing keys (#16893)

Kaspar Schleiser notifications at github.com
Fri Sep 24 21:39:39 CEST 2021

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
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### Contribution description

The target for generating SUIT keys (`$(SUIT_SEC)`) had `$(CLEAN)` as prerequisite, causing `make clean all` to essentially overwrite the SUIT key with a new one.

This might be unexpected, e.g., if the CoAP root contaning keys is static, but the application gets re-built with "make clean all", the previous manifests won't work anymore. Worse, if the user stores the key somewhere and sets the key folder (SUIT_KEY_DIR) to that location, the makefile might surprisingly overwrite the user's key.

This PR drops the CLEAN prereq from the keygen target.

(I'm not sure if this only hits when "include $(RIOTMAKE)/suit.base.inc.mk" is included?)

Put here the description of your contribution:
- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure

1. publish something
2. rebuild app with "make clean"
3. try to SUIT update to the previously published manifest

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
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### Issues/PRs references

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-- Commit Summary --

  * <a href="https://github.com/RIOT-OS/RIOT/pull/16893/commits/1eef39c27f152cbaccdcf06465863e37ac1d226a">makefiles/suit.base.inc.mk: don't clean existing keys</a>

-- File Changes --

    M makefiles/suit.base.inc.mk (2)

-- Patch Links --


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