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[Bug] Double loading symlinked files #3138

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itarato opened this issue Jun 27, 2023 · 3 comments · May be fixed by #3189
Open

[Bug] Double loading symlinked files #3138

itarato opened this issue Jun 27, 2023 · 3 comments · May be fixed by #3189
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compatibility

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@itarato
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itarato commented Jun 27, 2023

Consider the same file loaded twice, with and without a symlinked path:

mkdir real_dir
ln -s real_dir symlink_dir
cat 'puts("Loaded")' > real_dir/script.rb
require_relative("./real_dir/script")
require_relative("./symlink_dir/script")

CRuby loads the script once (Output = Loaded\n). TruffleRuby loads it twice (Output = Loaded\nLoaded\n).

Is this a bug?
@eregon
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eregon commented Jun 28, 2023

Yes, we should be compatible there.
IIRC the logic CRuby in CRuby for which part of the path to expand symlinks changed quite a bit over time, possibly we don't match what latest CRuby does there.

@rwstauner rwstauner mentioned this issue Jul 20, 2023
Merged
rwstauner added a commit to Shopify/truffleruby that referenced this issue Jul 26, 2023
@rwstauner
wip - Ensure symlinked files are not loaded twice
af7c08f 
TODO:
- changelog
- require (not relative) specs
- other specs?

closes oracle#3138
rwstauner added a commit to Shopify/truffleruby that referenced this issue Jul 27, 2023
@rwstauner
Ensure symlinked realpaths are not loaded twice
1df367c 
closes oracle#3138

Use a hash to cache realpath lookups
and another to cache realpath -> feature
similar to what was done in CRuby:
https://github.com/ruby/ruby/blob/499eb3990faeaac2603787f2a41b2d9625e180dc/load.c#L358-L402
https://github.com/ruby/ruby/blob/499eb3990faeaac2603787f2a41b2d9625e180dc/load.c#L1195-L1289
@rwstauner rwstauner linked a pull request Jul 27, 2023 that will close this issue
Open
rwstauner added a commit to Shopify/truffleruby that referenced this issue Jul 27, 2023
@rwstauner
Ensure symlinked realpaths are not loaded twice
89e47ef 
closes oracle#3138

Use a hash to cache realpath lookups
and another to cache realpath -> feature
similar to what was done in CRuby:
https://github.com/ruby/ruby/blob/499eb3990faeaac2603787f2a41b2d9625e180dc/load.c#L358-L402
https://github.com/ruby/ruby/blob/499eb3990faeaac2603787f2a41b2d9625e180dc/load.c#L1195-L1289
@eregon
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eregon commented Jul 28, 2023 •
edited

Does this issue happen in practice?
It seems a change from 3.2, so I guess it would behave the same as TruffleRuby on CRuby 3.1 and before.
cc @nirvdrum

@rwstauner
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that was my experience, seemed to be a change in 3.2:
https://github.com/oracle/truffleruby/pull/3189/files#diff-1be38982015c7d42487f6cb0dfd50ccb664506473122a57ec378d1f34440fcd9R407

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Ensure symlinked realpaths are not loaded twice Shopify/truffleruby
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@itarato @rwstauner @eregon