Two findings on the same consequence of pure reads: a profile can legitimately
carry no keys, because logging out clears them in place.
- sendLogoutRequestWithConfig went straight to wgtypes.ParseKey and failed with
"incorrect key size: 0" on the second logout of the same profile. There is
nothing to deregister for a peer that was never registered, so it returns
cleanly. Before pure reads this case was hidden: the read minted a key and
the daemon dialed management with one it had never seen.
- The mobile logout read the config with the generating reader right after
checking the file exists. The two are not atomic, so a profile removed in
between was resolved from the defaults and recreated by the write that
follows. It uses the existing-file reader now.
Reported by cubic-dev-ai and CodeRabbit on PR #7398.
riccardom
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