[TxMt] Re: [TM2] File Mode changes on Save

[Brad Choate]

On Dec 19, 2011, at 7:51 PM, Alexander Rudy wrote:

> I'm having some weird behavior with saving in textmate 2. Some files I save seem to magically acquire executable permissions (i.e. the file mode gains +x on user, group and other) when I hit save. This is a little annoying (nosetests doesn't pick up files with executable permissions by default) and possibly a security hole. However, it only seems to happen to *some* files and *some* saves. I can't even seem to reproduce it regularly.
> 
> Has anyone else seen this behavior or been able to reproduce it in a given context? I'd love to at least be able to track this behavior down and understand when/why it happens.

It's by design. This is happening due to a command in the "Source" bundle:

	Source -> Other Actions -> Make Script Executable (ruby)

(mislabeled, since it applies to scripts other than Ruby)

The scope selector for this command is:  source.ruby, source.perl, source.python

so, it will be invoked when a Ruby, Perl or Python script is saved. The "Semantic Class" setting for this command is the key thing here: "callback.document.did-save". The command runs upon saving one of these file types.

The command does a couple of tests before it makes the script executable. It tests if the target script is already executable. If it is, then it does nothing else. It also tests for a "#!" at the start of the script (a shebang line, indicating it is meant to be run as a command script). If it doesn't start with that, then the script won't be made executable.

So, if you have Python unit tests, you should be able to omit the "#!/usr/bin/python" or "#!env python" line at the top of the file. nosetests should pick them up even without this line.

-Brad