macOS build from source fails to start: "Could not determine the UTC offset on this system"

[arunkv]

Base system

Built on macOS Monterey 12.2 Beta (21D5025f) from master following instructions https://noaa-apt.mbernardi.com.ar/development.html#mac--osx
My system timezone is IST (UTC+0530)

Problem

Launching ./target/release/noaa-apt shows this error:

❯ ./target/release/noaa-apt
thread 'main' panicked at 'Could not determine the UTC offset on this system. Possible causes are that the time crate does not implement "local_offset_at" on your system, or that you are running in a multi-threaded environment and the time crate is returning "None" from "local_offset_at" to avoid unsafe behaviour. See the time crate's documentation for more information. (https://time-rs.github.io/internal-api/time/index.html#feature-flags): IndeterminateOffset', /Users/arun/.cargo/registry/src/github.com-1ecc6299db9ec823/simple_logger-1.16.0/src/lib.rs:409:85
stack backtrace:
0: rust_begin_unwind
at /rustc/404c8471aba60c2d837fa728e7c729a0f52d5830/library/std/src/panicking.rs:498:5
1: core::panicking::panic_fmt
at /rustc/404c8471aba60c2d837fa728e7c729a0f52d5830/library/core/src/panicking.rs:107:14
2: core::result::unwrap_failed
at /rustc/404c8471aba60c2d837fa728e7c729a0f52d5830/library/core/src/result.rs:1661:5
3: <simple_logger::SimpleLogger as log::Log>::log
4: log::__private_api_log
5: noaa_apt::gui::gui::create_window
6: ::connect_startup::startup_trampoline
7: _g_closure_invoke
8: _signal_emit_unlocked_R
9: _g_signal_emit_valist
10: _g_signal_emit
11: _g_application_register
12: _g_application_real_local_command_line
13: _g_application_run
14: ::run
15: noaa_apt::gui::gui::main
16: noaa_apt::main
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.

Workaround

Adding .with_utc_timestamps() to the SimpleLogger initialization in line 46 of src/main.rs worked around this problem.

[martinber]

Thank you very much!

I put a reminder in my phone to look and understand this in 2 weeks. I think it is slightly better to use local time instead of UTC. Apparently it is something new since the things I found when googling are recent, and I'm afraid that the libraries will change very soon:

• ravenclaw900/DietPi-Dashboard@a3853c2
• [Bug] thread 'main' panicked at 'Could not determine the UTC offset on this system.' ravenclaw900/DietPi-Dashboard#82
• Implement function returning the local UTC offset time-rs/time#203
• https://docs.rs/simple_logger/latest/simple_logger/struct.SimpleLogger.html#method.with_utc_timestamps
• Errors from example code borntyping/rust-simple_logger#47
• Crash in tests upon upgrade from v1.15.0 to v1.15.1 borntyping/rust-simple_logger#43

[martinber]

Now I updated the dependency simple_logger to 2.0.0, this makes the program use .with_utc_timestamps() by default (borntyping/rust-simple_logger#43). I would like to show logs in local time as previously but apparently there is not a simple way to do it in rust safely for all timezones.