Opened 3 years ago

Closed 3 years ago

#32716 closed Bug (fixed)

ManifestStaticFilesStorage crashes with max_post_process_passes = 0.

Reported by: Markus Bertheau Owned by: Arya Khaligh
Component: contrib.staticfiles Version: 3.2
Severity: Normal Keywords: staticfiles
Cc: Markus Bertheau, Arya Khaligh Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: yes UI/UX: no


To reproduce:

  1. Derive a custom class from ManifestStaticFilesStorage and set max_post_process_passes to 0:
    class MyManifestStaticFilesStorage(ManifestStaticFilesStorage):
        max_post_process_passes = 0
    STATICFILES_STORAGE = "MyManifestStaticFilesStorage"
  1. run collectstatic
      File "lib/python3.7/site-packages/django/contrib/staticfiles/management/commands/", line 188, in handle
        collected = self.collect()
      File "lib/python3.7/site-packages/django/contrib/staticfiles/management/commands/", line 128, in collect
        for original_path, processed_path, processed in processor:
      File "lib/python3.7/site-packages/django/contrib/staticfiles/", line 403, in post_process
        yield from super().post_process(*args, **kwargs)
      File "lib/python3.7/site-packages/django/contrib/staticfiles/", line 251, in post_process
        if substitutions:
    UnboundLocalError: local variable 'substitutions' referenced before assignment

The error can also be seen easily in the code:

subtitutions is only set if the loop is entered at least once.

(The motivation to set max_post_process_passes to 0 is to have Django not produce invalid CSS as described here: )

Change History (9)

comment:1 by Markus Bertheau, 3 years ago

An effective workaround is overriding patterns = (). It might not be worth fixing the UnboundLocalError.

comment:2 by Mariusz Felisiak, 3 years ago

Component: Uncategorizedcontrib.staticfiles
Easy pickings: set
Summary: ManifestStaticFilesStorage.max_post_process_passes = 0 crashes collectstaticManifestStaticFilesStorage crashes with max_post_process_passes = 0.
Triage Stage: UnreviewedAccepted
Type: UncategorizedBug

I think it's worth fixing.

comment:3 by kingliar420, 3 years ago

Hi guys,

Can I work on this?

in reply to:  3 comment:4 by Mariusz Felisiak, 3 years ago

Replying to kingliar420:

Can I work on this?

Sure there is no need to ask. Please remember that a regression test is required.

comment:5 by kingliar420, 3 years ago

Owner: changed from nobody to kingliar420
Status: newassigned

comment:6 by Markus Bertheau, 3 years ago

Cc: Markus Bertheau added

comment:7 by Arya Khaligh, 3 years ago

Cc: Arya Khaligh added
Keywords: staticfiles added
Owner: changed from kingliar420 to Arya Khaligh

comment:9 by Mariusz Felisiak <felisiak.mariusz@…>, 3 years ago

Resolution: fixed
Status: assignedclosed

In 651e527f:

Fixed #32716 -- Fixed ManifestStaticFilesStorage crash when max_post_process_passes is 0.

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