Opened 4 years ago

Last modified 3 months ago

#21080 new Bug

collectstatic post-processing fails for references inside comments

Reported by: shreyas@… Owned by: nobody
Component: contrib.staticfiles Version: 1.11
Severity: Normal Keywords:
Cc: Triage Stage: Accepted
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no


"python collectstatic" is attempting to parse references inside css comments and generating errors during post-processing. I am using:

The following snippet of code in test.css:

.gfg-collapse-closed {
  /* background-image : url('arrow_close.gif'); */

produces the following error:

ValueError: The file 'stylesheets/arrow_close.gif' could not be found with < object at 0x1078a3910>.

Ideally, collectstatic should respect CSS comments and should not attempt to parse/reference files in lines that are commented out.

If the fix is too complex, a simple workaround might be to include a --ignore-error flag that would allow the application to continue post-processing even when it sees errors

Change History (7)

comment:1 Changed 4 years ago by Kevin Christopher Henry

Triage Stage: UnreviewedAccepted

CachedFilesMixin is using simple regular expressions to match url and @import statements, and so is picking up the ones inside comments. It would also have a problem if the text was inside a string.

If it's possible to rewrite the regex to cover all the corner cases, that would be the easy fix. But I doubt it. The robust way would be to parse the css files properly, but that would mean rewriting a lot of code...

comment:2 Changed 4 years ago by anonymous

Could you recommend a path forward? Can we at least have it skip failed imports with a warning rather than break?


comment:3 Changed 4 years ago by Pablo SEMINARIO

I'm agree with the comment of @marfire, the correct way to do this is with a CSS parser, because there are many cases to be treated (multi-line comments, nested comments, broken comments, etc.)

Adding an option to skip failed imports was reported in ticket:19650 and it was marked as a duplicated of ticket:18958.

If you really need ignore these errors, you can create a subclass of CachedFilesMixin on your own project and add a try...except statement to handle these kind of exceptions.

comment:4 Changed 4 years ago by German Larrain

This bit me today. "Dumb" workaround: replace that url in your comments with u r l.

comment:5 Changed 4 years ago by Ben Spaulding

Just as an additional datapoint and another thing to consider if it comes to parsing the CSS, I recently started working on a project where the designers used some CSS expressions for an IE-specific stylesheet. The JScript used in one expression puts a particularly crazy bit like .replace('url("','').replace('")',''). As marfire said, that url bit in a string raises an exception. Fortunately I can overcome this for my project with a simple sublcass to make a very small change to the regular expression used. But that is one other thing to consider if it is decided that the CachedStaticFilesStorage needs to be more robust.

comment:6 Changed 3 months ago by Udo Schochtert

hi, apparently this issue is still open in django 1.11.

my deploy to heroku failed with the following error log:

    $ python collectstatic --noinput
       Post-processing 'jquery-ui-dist/jquery-ui.theme.css' failed!
       Traceback (most recent call last):
         File "", line 10, in <module>
         File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/", line 364, in execute_from_command_line
         File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/", line 356, in execute
         File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/", line 283, in run_from_argv
           self.execute(*args, **cmd_options)
         File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/", line 330, in execute
           output = self.handle(*args, **options)
         File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/staticfiles/management/commands/", line 199, in handle
           collected = self.collect()
         File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/staticfiles/management/commands/", line 145, in collect
           raise processed The file 'jquery-ui-dist/"images/ui-icons_555555_256x240.png"' could not be found with < object at 0x7ff880f551d0>.
       The CSS file 'jquery-ui-dist/jquery-ui.theme.css' references a file which could not be found:
       Please check the URL references in this CSS file, particularly any
       relative paths which might be pointing to the wrong location.
 !     Error while running '$ python collectstatic --noinput'.
       See traceback above for details.
       You may need to update application code to resolve this error.
       Or, you can disable collectstatic for this application:
          $ heroku config:set DISABLE_COLLECTSTATIC=1
 !     Push rejected, failed to compile Python app.
 !     Push failed

the "collectstatic" command fails here:
... The file 'jquery-ui-dist/"images/ui-icons_555555_256x240.png"' could not be found with ...
because it tries to parse js comments.

The file path should be

  • jquery-ui-dist/images/ui-icons_555555_256x240.png

and not

  • jquery-ui-dist/"images/ui-icons_555555_256x240.png"

other people on stackoverflow run inmto this issue as well:

would be great if this issue could be fixed. thanks ;)

comment:7 Changed 3 months ago by Udo Schochtert

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