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we've recently updated Imagemagick in NixOS from version 6.9.7-6 to
6.9.8-4, and this change causes the Ikiwiki test suite to fail in
t/img.t, like so:
# Failed test at t/img.t line 119.
# got: 'no image'
# expected: '10x10'
# Failed test at t/img.t line 129.
# got: 'no image'
# expected: '12x12'
# Failed test at t/img.t line 130.
# got: 'no image'
# expected: '16x2'
# Failed test at t/img.t line 134.
# got: 'no image'
# expected: '8x8'
# Failed test at t/img.t line 135.
# got: 'no image'
# expected: '4x4'
# Failed test at t/img.t line 136.
# got: 'no image'
# expected: '6x6'
# Failed test at t/img.t line 138.
# got: 'no image'
# expected: '11x11'
# Failed test at t/img.t line 139.
# got: 'no image'
# expected: '12x12'
# Failed test at t/img.t line 140.
# got: 'no image'
# expected: '13x13'
# Looks like you failed 9 tests of 62.
t/img.t ........................
Dubious, test returned 9 (wstat 2304, 0x900)
Failed 9/62 subtests
Is this is a known problem and is there maybe a fix for this issue?
> This was not a known bug before your report. It looks as though every
> time we use `Image::Magick->Read(":foo.png")`, which is (or was)
> ImageMagick's syntax for opening a file of unknown type without
> interpreting a prefix containing `:` as a special directive instead
> of part of the filename, it fails.
>
> Please try re-running the test with better diagnostics using
> [commit 4ace7dbb7](http://source.ikiwiki.branchable.com/?p=source.git;a=commitdiff;h=4ace7dbb7)
> and report what it says. --[[smcv]]
>> I see the same issue on Fedora, with ImageMagic 6.9.9-19:
>>
>> # Failed test at t/img.t line 119.
>> # got: 'no image: Exception 435: unable to open image `:t/tmp/out/imgconversions/10x-redsquare.png': No such file or directory @ error/blob.c/OpenBlob/2701'
>> # expected: '10x10'
>> [...]
>>
>> So it seems, that an empty coder prefix is not accepted anymore. To me it seems that [this commit](https://github.com/ImageMagick/ImageMagick/commit/4bc9b6b) changed the behavior. Unfortunately, the commit message doens't tell us about the reasons behind. The commit is included from version 6.9.8-3 on.
>>> This should now be [[fixed|done]] in git and in the next release.
>>> The test failure does not indicate a loss of functionality, unless
>>> you are using uncommon image formats enabled with
>>> `img_allowed_formats: [everything]`, which is a potential security
>>> vulnerability because it exposes the attack surface of all
>>> ImageMagick decoder modules. --[[smcv]]
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