Broken pipe (os error 32) when piping output to head

[gingkapls]

thread 'main' panicked at 'failed printing to stdout: Broken pipe (os error 32)', library/std/src/io/stdio.rs:895:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

shows up sometimes whenever I pipe the output of flavours info $(flavours current) using head like this

flavours info $(flavours current) | head -n<integer>

The command works fine and the error can be avoided by redirecting it to /dev/null but thought I'd let you know just in case.

also running with env variable RUST_BACKTRACE=1 doesn't provide a backtrace

[Misterio77]

Hmmm this seems to be a problem with the print macro in Rust.

Apparently, head closes the stream when it's done receiving the specified number of lines, which raises an Err. println! then unwraps that Result instead of moving it up, causing a panic instead of returning a Result i can handle to gracefully close the program.

Long story short, writing to stdout can fail and the widely used print feature Rust has won't handle it.

It seems the way to go would be replacing print!s with write!s, which do propagate Results.

The possible workarounds seem to be your /dev/null piping, or piping flavours info through cat before piping it to head.

I'll probably get to it in the next few days/weeks, but feel free to write a patch if you have the time to spare ❤

[Misterio77]

This should be fixed in the commit d958a60. I'll push a new release soon!