[ruby-core:103855] [Ruby master Bug#12551] Exception accessing file with long path on windows

Issue #12551 has been updated by gabuscus (Gabriel Nagy).


Hello,

I managed to compile Ruby with Visual C++ and long paths support by using an application manifest. I validated some basic things like executing a script from a really long path, and creating a directory with path over 255 characters.

This is the code, which works, but I'm hardcoding stuff since I don't know where would be the best place to put it: https://github.com/GabrielNagy/ruby/commit/eb785c9a567ce058b7e2f16d3a1f53014f245687

I'd appreciate if someone could point me to how I could implement this in a cleaner way.

Thanks!

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Bug #12551: Exception accessing file with long path on windows
https://bugs.ruby-lang.org/issues/12551#change-91976

* Author: Maturin (Lars Benner)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x64-mingw32]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Accessing file with a long file name causes this exception:

C:/Projects/Head/Build/cm/testdir01/testdir02/testdir03/testdir04/testdir05/testdir06/testdir07/testdir08/testdir09/testdir10/testdir11/testdir12/testdir13/testdir14/testdir15/testdir16/testdir17/testdir18/testdir19/testdir20/testdir21/testdir22/longtestfile.name.txt
repro_lstat_exception.rb:42:in `stat': No such file or directory @ rb_file_s_stat - C:/Projects/Head/Build/cm/testdir01/testdir02/testdir03/testdir04/testdir05/testdir06/testdir07/testdir08/testdir09/testdir10/testdir11/testdir12/testdir13/testdir14/testdir15/testdir16/testdir17/testdir18/testdir19/testdir20/testdir21/testdir22/longtestfile.name.txt (Errno::ENOENT)
        from repro_lstat_exception.rb:42:in `block in <main>'
        from repro_lstat_exception.rb:13:in `chdir'
        from repro_lstat_exception.rb:13:in `<main>'

Can be reproduced with the attach script.

I used windows 7 64 bit and an NTFS file system. 

For me it looks like, it has something to do with the legacy MAX_PATH_LENGTH of 260 characters. See https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath for more information. 

Originally I discovered the bug with JRuby (https://github.com/jruby/jruby/issues/3995).

With older Ruby version, I tried 1.8.5, it is working.



---Files--------------------------------
long_file_name_error.zip (10.7 KB)


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