Question

I’m creating a fabric deploy script for my Symfony project.
I’d like to detect if a file has changed since last commit, in order to open it and modify it.

I’m currently trying that:

def changes_between_two_diffs_grep(grepval):
    return run("git diff --name-only %s %s > /dev/null | grep '%s'; echo $?" % (env.point, env.old_point, grepval))

if (changes_between_two_diffs_grep('parameters.yml.dist') == "0"):
    edit_config()

But in vain.

Did I missed something?

Answer 1

Seems to me you have mistakenly put the > /dev/null in the command.
It will cause nothing to pass (via pipe) to the grep command, hence nothing found by grep.

When grep finds nothing it returns 1.

This means you will forever get 1 from changes_between_two_diffs_grep()