585091 - Support simple input/output redirection in pymake native commands

Status: RESOLVED WONTFIX

(Firefox Build System :: General, defect)

Description

[(not currently active) Ted Mielczarek]

Right now you can't use input/output redirection in combination with Pymake commands. The command parser errors out if any shell metacharacters are seen, which includes < and >:
http://hg.mozilla.org/users/bsmedberg_mozilla.com/pymake/file/e50be3234e39/pymake/data.py#l1177

It wouldn't be hard to support output redirection for native commands. If we limited it to just supporting stdin/stdout/stderr then it'd just be a matter of swapping out sys.std{in,out,err} in PythonJob.run like we do with os.environ, and swapping them back in the finally block:
http://hg.mozilla.org/users/bsmedberg_mozilla.com/pymake/file/e50be3234e39/pymake/process.py#l175

The only complicated part is probably parsing the redirections out of the command and then removing them before parsing the rest of the command.

This would be useful because we have things that use Preprocessor.py but redirect the output to a file. We also have commands like `printf "foo" > file` which would be a pretty trivial native command otherwise.

Comment 1

[(not currently active) Ted Mielczarek]

See also bug 585113 about line continuations.

Comment 2

[Chris Cooper [:coop] (he/him)]

Mass close of pymake-related bugs.