contrib.files.append([...], use_sudo_=True) does not work with 'cd()' ctx manager #703

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@mikek
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mikek commented Aug 12, 2012
with settings(user=some_user), cd('/home/some_user'):
    append('.ssh/authorized_keys', key, partial=True, use_sudo=use_sudo)

This code silently duplicates existing key in a checked file. The full resulting command is:

sudo -S -p 'sudo password:'  cd /home/some_user && egrep "^ssh\-rsa\ AAAAB3Nza[...]jN\+v7w\=\=" ".ssh/authorized_keys"

(as returned by _shell_wrap() call) The problem is: normally, there is no standalone 'cd' command in UNIX, as it is a shell built-in. And ommiting context manager #with settings(hide('everything'), warn_only=True): at the end of contains() reveals that.

Quick test to use shell=True in the final call inside contains() fixes that, but possibly has other side-effects.

@bitprophet
Member

Yes, adding shell=False to contains and sed were done to remove one level of quoting which was causing issues in various situations, but I can see how that would sink the way cd behaves.

I don't see a good way to have our cake and eat it too, but am open to suggestions. Best I can think of is to add this as a warning in the docstrings in contrib, and an option to these affected methods to allow overriding the shell=False.

@mikek
Contributor
mikek commented Aug 19, 2012

It seems running commands this way cd /home/foo && sudo -S -p 'sudo password:' egrep [...] is not what we want.
So here is the quick "workaround" you've suggested. I am not sure where the general warning should go and if the 1.4.4 is the right version to mention in versionchanged. Can you look at this branch and tell if it is OK to send this as a pull request?

@bitprophet
Member

That branch looks good, besides two nitpicks:

  • 1.5's the right version to use -- this is an API change (even though it's in the service of fixing something bug-ish).
  • Please add an entry at the top of docs/changelog.rst following the style of existing entries, e.g. "Add a shell kwarg to many methods in ~fabric.contrib.files to help avoid conflicts with cd and similar`".

Re: the PR, I'd recommend using hub pull-request to add the PR to this ticket so we avoid having two tickets.

Thanks!

@mikek
Contributor
mikek commented Nov 25, 2012

Do you have any objections on this (the 1.5.x is already out now)?

@bitprophet bitprophet added a commit that referenced this pull request Jan 25, 2013
@bitprophet bitprophet Attribution re #703 830a890
@bitprophet
Member

All set now; updated versionadded bits to 1.6 since 1.5 came out a little while ago. Thanks again, & apologies for the delay!

@bitprophet bitprophet closed this Jan 25, 2013
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