Add a `pip check` command. #1001

Wilfred · 2013-06-19T12:16:41Z

This command ensures that all packages installed have all the
requirements they need, and that requirements have compatible
versions. This is useful because pip can install incompatible
dependencies[1], or a user may have manually (un)installed a
package.

[1] #775

This is loosely inspired by Haskell's ghc-pkg check, which has a similar purpose.

pnasrat · 2013-06-19T14:08:25Z

Could you also write some tests for this new functionality.

hltbra · 2013-06-24T01:44:56Z

pip/commands/check.py

+
+            missing_requirements = get_missing_requirements(dist, installed)
+            for requirement in missing_requirements:
+                f.write("%s %s requires %s, which is not installed.\n" % \


It would be nicer to use pip's logging system instead of sys.stdout

Please don't use backslashes in braces, line continuation is implied inside of them. Also what @hltbra said.

qwcode · 2013-06-24T04:57:04Z

let's just make sure this get's discussed on pypa-dev before anyone merges, since it's a new top-level command.

Wilfred · 2013-06-24T10:44:18Z

Thanks for the review. I'll make changes based on the feedback, add tests, and start a thread on pypa-dev. Any further code-related abuse welcomed, I'm not familiar with pip internals.

Wilfred · 2013-06-24T10:58:08Z

I've started a thread on pypa-dev: https://groups.google.com/d/msg/pypa-dev/BI6mT9lkWF0/jmriRWOCQgkJ

I'm going to make the additional changes as additional commits, unless anyone would like me to squash my commits.

jezdez · 2013-06-24T11:48:32Z

pip/commands/check.py

+    """
+    installed_names = set(d.project_name for d in installed_dists)
+
+    missing_requirements = set()


sets aren't ordered but you seem to use the return values in an iteration. This should be a list instead.

Also, can you put these functions into the check command class? There is no need to offer them as module level functions.

I've changed the functions to be methods.

I don't understand your point regarding sets. Sets aren't ordered, but they're iterable, and order isn't necessary here. I just used sets to ensure there aren't duplicates. Could you clarify?

Thanks @Wilfred.

Regarding using a set, get_installed_distributions iterates over the pkg_resources working set, which is a reprensentation of the currently installed packages, a list behind the scenes (https://bitbucket.org/pypa/setuptools/src/eb58c3fe7c0881cbb28de1c523f083ad8e7f427d/pkg_resources.py?at=default#cl-542). Being able to retain all information about this working set is very useful when you want to debug a situation with setuptools since it may add packages to that working set in a specific order due to the use of egg files et al. In other words, this subcommand should retain the order of requirements to be closer to the underlying technology.

Wilfred · 2013-06-27T10:18:40Z

Done. Let me know if there are further changes you'd like. Travis is showing one failing test: https://travis-ci.org/pypa/pip/builds/8419951 but this is an unrelated test that was fixed in this commit: 3ea56ea.

qwcode · 2013-08-14T21:19:55Z

tests/functional/test_check.py

+def test_check_missing_dependency():
+    reset_env()
+    # this will also install ipython, a dependency
+    run_pip('install', 'ipdb==0.7')


we're trying to convert over to local test packages, vs calling out to pypi.
ideally, you should engineer packages to go into tests/data/packages (or just include these)
e.g. see the use of pip_install_local in test_install_wheel.py and other files that installs packages from our local test data.

otoh, @dstufft may soon have our tests spinning up a fake pypi, and we'd halt on converting to pip_install_local, so maybe don't bother your time right now.

qwcode · 2013-08-14T21:23:25Z

It's helpful to know that pkg_resources.WorkingSet.resolve has all this logic, although it's written for another purpose, and it's written to raise exceptions when the first problem is found.

Wilfred · 2013-08-21T17:52:20Z

Thanks for the feedback; I'll update the pull request.

This command ensures that all packages installed have all the requirements they need, and that requirements have compatible versions. This is useful because pip can install incompatible dependencies[1], or a user may have manually (un)installed a package. [1] pypa#775

Wilfred · 2013-08-27T17:57:35Z

OK, I've rebased on develop, updated the tests correspondingly, and squashed everything into one commit.

I see the way to call pip in the tests has changed, are there further changes you'd like me to make to the tests?

Re pkg_resources.WorkingSet.resolve, I found the documentation a little tricky to read, so I'd missed that. Looking at http://pythonhosted.org/distribute/pkg_resources.html#workingset-methods-and-attributes I can't see anything about .resolve raising exceptions. Sounds like WorkingSet.resolve isn't quite suitable here sadly.

randfur · 2014-05-27T01:44:51Z

It's a shame this change seems to have stagnated, this check would be very useful in scripts.

Wilfred · 2014-05-27T16:57:48Z

I'm still happy to do any further work to get it merged, FWIW. I'm not sure if the core team is still interested in the feature.

Ivoz · 2014-05-27T17:01:55Z

IMHO I would prefer to solve the root cause by fixing pip to stop itself from producing such a broken state in the first place.

Wilfred · 2014-05-27T17:07:37Z

The proper solution is #988, but I think that's a major undertaking. Even once it's fixed, there will be environments in a broken state as a result of using older pip versions (or easy_install, or manually changing files in the current virtualenv), so this feature would have value then.

msabramo · 2014-12-22T07:29:58Z

This seems like it would be useful. I sent a PR to @Wilfred to update a couple of small bugs:

Wilfred#1

msabramo · 2015-03-06T07:22:14Z

This needs to be updated because it's using pip.log and that doesn't exist anymore.

767d11e

msabramo · 2015-03-06T07:57:45Z

This has a few problems with it that I noticed while pulling it down and testing it out. I'll try to update it, because it seems useful to me.

msabramo · 2015-03-06T09:07:17Z

OK, I would recommend closing this and looking at #2492 instead. It's @Wilfred's work but updated to work with the latest code on develop and refactored a bit.

msabramo · 2015-03-07T02:30:04Z

Replaced by #2492

dstufft · 2016-05-18T11:32:47Z

Accidentally closed this, reopening. Sorry!

BrownTruck · 2016-05-19T12:03:48Z

Hello!

As part of an effort to ease the contribution process and adopt a more standard workflow pip has switched to doing development on the master branch. However, this Pull Request was made against the develop branch so it will need to be resubmitted against master.

If you do nothing, this Pull Request will be automatically migrated by @BrownTruck for you.

If you would like to retain control over this pull request then you should resubmit it against the master branch, closing and referencing the original Pull Request.

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This command ensures that all packages installed have all the
requirements they need, and that requirements have compatible
versions. This is useful because pip can install incompatible
dependencies[1], or a user may have manually (un)installed a
package.

[1] #775

This is loosely inspired by Haskell's ghc-pkg check, which has a similar purpose.

---

*This was migrated from pypa/pip#1001 to reparent it to the ``master`` branch. Please see original pull request for any previous discussion.*

If this pull request is no longer needed, please feel free to close it.

BrownTruck · 2016-05-26T10:57:28Z

This Pull Request has been automatically migrated to #3745 to reparent it to the master branch. Please see the new pull request for any new discussion.

hltbra reviewed Jun 24, 2013
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jezdez reviewed Jun 24, 2013
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qwcode reviewed Aug 14, 2013
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msabramo mentioned this pull request Dec 20, 2014

Idea: Check for packages with 2 installed versions #2235

Closed

msabramo mentioned this pull request Mar 6, 2015

Add a pip check command. #2492

Closed

dstufft closed this May 18, 2016

dstufft reopened this May 18, 2016

BrownTruck added the asked to reparent label May 19, 2016

BrownTruck mentioned this pull request May 26, 2016

Add a pip check command. #3745

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BrownTruck added migrated to master and removed asked to reparent labels May 26, 2016

BrownTruck closed this May 26, 2016

BrownTruck mentioned this pull request May 26, 2016

Add a pip check command. #3750

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Add a `pip check` command. #1001

Add a `pip check` command. #1001

Wilfred commented Jun 19, 2013 •

edited by BrownTruck

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pnasrat commented Jun 19, 2013

hltbra Jun 24, 2013

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Wilfred commented Jun 27, 2013

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Wilfred commented May 27, 2014

msabramo commented Dec 22, 2014

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BrownTruck commented May 26, 2016

Add a pip check command. #1001

Add a pip check command. #1001

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Add a `pip check` command. #1001

Add a `pip check` command. #1001

Wilfred commented Jun 19, 2013 •

edited by BrownTruck

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