3f3c4d2e2e
fad0867d6ab9430070aa7d60bf7617a6508e0586 Cleanup -includeconf error message (MarcoFalke)
fa9f711c3746ca3962f15224285a453744cd45b3 Fix crash when parsing command line with -noincludeconf=0 (MarcoFalke)
Pull request description:
The error message has several issues:
* It may crash instead of cleanly shutting down, when `-noincludeconf=0` is passed
* It doesn't quote the value
* It includes an erroneous trailing `\n`
* It is redundantly mentioning `"-includeconf cannot be used from commandline;"` several times, when once should be more than sufficient
Fix all issues by:
* Replacing `get_str()` with `write()` to fix the crash and quoting issue
* Remove the `\n` and only print the first value to fix the other issues
Before:
```
$ ./src/bitcoind -noincludeconf=0
terminate called after throwing an instance of 'std::runtime_error'
what(): JSON value is not a string as expected
Aborted (core dumped)
$ ./src/bitcoind -includeconf='a b' -includeconf=c
Error: Error parsing command line arguments: -includeconf cannot be used from commandline; -includeconf=a b
-includeconf cannot be used from commandline; -includeconf=c
```
After:
```
$ ./src/bitcoind -noincludeconf=0
Error: Error parsing command line arguments: -includeconf cannot be used from commandline; -includeconf=true
$ ./src/bitcoind -includeconf='a b' -includeconf=c
Error: Error parsing command line arguments: -includeconf cannot be used from commandline; -includeconf="a b"
```
Hopefully fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34493
Testcase: https://github.com/bitcoin/bitcoin/files/6515429/clusterfuzz-testcase-minimized-system-6328535926046720.log
```
FUZZ=system ./src/test/fuzz/fuzz ./clusterfuzz-testcase-minimized-system-6328535926046720.log
```
See https://github.com/bitcoin/bitcoin/blob/master/doc/fuzzing.md
ACKs for top commit:
sipa:
utACK fad0867d6ab9430070aa7d60bf7617a6508e0586
Tree-SHA512: b44af93be6bf71b43669058c1449c4c6999f03b5b01b429851b149b12d77733408cb207e9a3edc6f0bffd6030c4c52165e8e23a1c2718ff5082a6ba254cc94a4
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