Add an abstraction to std::io::process for dealing with error gracefully

[emberian]

A very common pattern when dealing with subprocesses is, when they fail, to print out or log some diagnostics. Lots of code that uses std::run rolls their own version of this. This shouldn't live in the stdlib, I think. Ideally a really nice CLI library would live in the extra conglomerate. For now, developing it as a separate crate and then merging it into libextra temporarily would be good.

Examples that this would ideally replace:

https://github.com/huonw/multibuilder/blob/master/git.rs#L36 (and bunch elsewhere in this file)
https://github.com/huonw/multibuilder/blob/master/git.rs#L108
alexcrichton@cff13ae#diff-88c3a4f09e02361c7490165aacee98dfR41

(I'm sure many more can be found in other codebases)

[aochagavia]

std::run has been removed and some of its functionalities have been moved to std::io::process (see #12380)

Does this issue still apply?

[alexcrichton]

This does indeed, updating the title.

[lambda-fairy]

The links in @cmr's post seem to be broken.

git.rs is at https://github.com/huonw/multibuilder/blob/master/src/git.rs now, which should cover the first two. Not sure about the third one though.

[steveklabnik]

With IO reform, what is the state of this?

[emberian]

With the new Command and Process, I think this is very nice, nearly as nice as it can be!