Rust (since 1.62) ignores EPIPE by default (see [Rust #62569]),
causing writes to closed pipes to return `io::ErrorKind::BrokenPipe`
errors. The `println!` macro panics on these errors, producing a
confusing backtrace instead of the silent exit expected of Unix CLI
tools.
To avoid the use of `print!` and `println!`, the `radicle-term`
helper functions use `write!` and `writeln!`. This lays the groundwork
for the `rad` CLI to transition to using only `radicle-term`
functions.
There was a first attempt made, which is documented here. A
process-wide SIGPIPE reset (`SIG_DFL`) was ruled out because `rad`
manages child processes via libgit2 pipes and communicates with the
radicle node over Unix sockets. Resetting SIGPIPE globally caused
`rad` itself to be killed during internal pipe operations (e.g. during
`rad remote add --fetch`), producing flaky test failures.
[Rust #62569] https://github.com/rust-lang/rust/issues/62569
Add tests that verify the `rad` binary does not panic when its stdout
is a broken pipe (e.g., `rad config | head -1`).
Rust (since 1.62) ignores SIGPIPE by default (see [Rust #62569]),
causing `println!` to panic with "failed printing to stdout: Broken
pipe" instead of exiting silently. This is the standard Unix behaviour
expected of CLI tools.
These tests currently fail on `rad config` and `rad self`, and are set to `ignore`, to be enabled when fixed.
[Rust #62569]: https://github.com/rust-lang/rust/issues/62569
Josh Soref
Fintan Halpenny