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| Subject: | Re: error in "cygpath" behavior |
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| References: | <20180831085734 DOT GF6350 AT calimero DOT vinschen DOT de> <5b89c269 DOT 1c69fb81 DOT 84d1a DOT 6f1b AT mx DOT google DOT com> |
| From: | Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca> |
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| Date: | Sat, 1 Sep 2018 00:53:56 -0600 |
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On 2018-08-31 16:34, Steven Penny wrote: > On Fri, 31 Aug 2018 10:57:34, Corinna Vinschen wrote: >> Long-standing behaviour. ".." in Cygwin and ".." in Windows can totally >> disagree. The path is always convert to absolute at this point in favor >> of correct output. There's also the additional restriction (though >> not in this case) that relative Windows paths must not be longer than >> MAX_PATH (260) chars. >> I'm certainly open to patches to the underlying cygwin_conv_path >> function to change the Windows path to relative if possible. > I am not understanding - it appears that "dot-dot" (..) is well defined by > POSIX: >> The special filename dot-dot shall refer to the parent directory of its >> predecessor directory. As a special case, in the root directory, dot-dot may >> refer to the root directory itself. > http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13 > so it would appears that ".." would be an acceptable return value in any case. See Eric Blake's response to other poster. Proc FS entry /proc/self/cwd only links to the current working directory, and may/does? not necessarily reflect the logical or physical path taken by cd to get to the current directory: only the current shell tracks the logical or physical path taken by cd to get to the current directory, and can interpret to which directory .. refers. If /proc/self/cwd tracked all processes' logical or physical paths taken by chdir(2) to get to the current directory, that link might be used to resolve .. unambiguously. Quoting Corinna: "PGA" ;^> -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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