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[ntcore] Write empty persistent file if none found (#4996)

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This avoids the warning appearing on every startup when persistent
values aren't used.

Also add note to message saying it can be ignored if persistent values
aren't expected.
This commit is contained in:
Peter Johnson
2023-01-21 22:09:24 -08:00
committed by GitHub
parent 522be348f4
commit 008232b43c
1 changed files with 10 additions and 2 deletions
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12
ntcore/src/main/native/cpp/NetworkServer.cpp
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@@ -360,8 +360,16 @@ void NSImpl::LoadPersistent() {
auto size = fs::file_size(m_persistentFilename, ec);
wpi::raw_fd_istream is{m_persistentFilename, ec};
if (ec.value() != 0) {
INFO("could not open persistent file '{}': {}", m_persistentFilename,
ec.message());
INFO(
"could not open persistent file '{}': {} "
"(this can be ignored if you aren't expecting persistent values)",
m_persistentFilename, ec.message());
// try to write an empty file so it doesn't happen again
wpi::raw_fd_ostream os{m_persistentFilename, ec, fs::F_Text};
if (ec.value() == 0) {
os << "[]\n";
os.close();
}
return;
}
is.readinto(m_persistentData, size);