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lightningd: disallow --daemon without --log-file. #4350

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rustyrussell
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From #clightning:

 (11:24:10) andytoshi: hiya, i'm trying to set up a new lightningd node, and when i run lightningd --network=bitcoin --log-level=debug --daemon
 (11:24:17) andytoshi: i get errors of the form fetchinvoice: Malformed JSON reply '2021-01-25T00:51:16.655Z DEBUG   plugin-offers: disabled itself at init: offers not enabled in config
 (11:24:43) andytoshi: there are a couple variants of this, but always some form of "something: failed to parse <a log line> as json"

Indeed, we close stdout, and it ends up being reused for some plugin.
But the real problem is that we log to stdout by default, which doesn't
make sense. If they really want to discard logs, they can use
--log-file=/dev/null.

@cdecker
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cdecker commented Jan 26, 2021

ACK 0efec23

From #clightning:

    (11:24:10) andytoshi: hiya, i'm trying to set up a new lightningd node, and when i run lightningd --network=bitcoin --log-level=debug --daemon
    (11:24:17) andytoshi: i get errors of the form fetchinvoice: Malformed JSON reply '2021-01-25T00:51:16.655Z DEBUG   plugin-offers: disabled itself at init: offers not enabled in config
    (11:24:43) andytoshi: there are a couple variants of this, but always some form of "something: failed to parse <a log line> as json"

Indeed, we close stdout, and it ends up being reused for some plugin.
But the real problem is that we log to stdout by default, which doesn't
make sense.  If they really want to discard logs, they can use
--log-file=/dev/null.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: JSON failures when --daemon is used without --log-file.
@rustyrussell rustyrussell merged commit 0056dd7 into ElementsProject:master Jan 31, 2021
@cdecker cdecker linked an issue Feb 16, 2021 that may be closed by this pull request
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lightningd crashes because of log messages
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