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[[!comment format=mdwn
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username="kyle"
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avatar="http://cdn.libravatar.org/avatar/7d6e85cde1422ad60607c87fa87c63f3"
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subject="comment 3"
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date="2020-06-30T16:26:17Z"
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content="""
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[ I don't have a good understanding of the build issues here. I'm
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sorry if this isn't relevant. ]
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> I found, the build becomes reproducible, when using a filesystem
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> with deterministic readdir order such as disorderfs with sort mode.
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This reminded me of an issue with Guix's git-annex build:
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<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=33922>. In that case,
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the nondeterminism came from \"package database files that are
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generated by ghc-pkg (where readdir is used and the result isn’t
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sorted)\".
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The fix on Guix's end, 5de93cdba7 (gnu: ghc-8: Patch ghc-pkg for
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reproducibility, 2019-01-17), was at the level of the ghc package. It
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replaced the following line in utils/ghc-pkg/Main.hs
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```
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confs = map (path </>) $ filter (\".conf\" `isSuffixOf`) fs
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```
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with
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```
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confs = map (path </>) $ filter (\".conf\" `isSuffixOf`) (sort fs)
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```
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"""]]
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