#4215: canonicalizePath behaves strangely with paths that do not exist
---------------------------------+------------------------------------------
Reporter: creswick | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries/directory
Version: 6.12.3 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: Incorrect result at runtime
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The behavior of System.Directory.canonicalizePath is not documented (and
perhaps not defined) for paths that do not exist on the file system. The
documentation should, minimally, indicate that this is the case. Ideally,
the behavior would be well-defined.
This is complicated by differing behaviors of the underlying
realpath(char*, char*) function in Linux and OS X. On Linux, realpath
changes its behavior if the last existing portion of the input path is a
file vs. a directory, while OS X does not alter behavior in these two
cases. Specifically, assume the following:
* $HOME/tmp/foo is a file.
* $HOME/tmp/bar is a directory.
* $HOME/tmp/baz does not exist.
Linux:
{{{
Prelude System.Directory> canonicalizePath "/home/creswick/tmp/foo/subdir"
"/home/creswick/tmp/foo"
Prelude System.Directory> canonicalizePath "/home/creswick/tmp/bar/subdir"
"/home/creswick/tmp/bar/subdir"
Prelude System.Directory> canonicalizePath "/home/creswick/tmp/baz/subdir"
"/home/creswick/tmp/baz"
}}}
OS-X:
{{{
Prelude System.Directory> canonicalizePath "/Users/hudson/tmp/foo/subdir"
"/Users/hudson/tmp/foo/subdir"
Prelude System.Directory> canonicalizePath "/Users/hudson/tmp/bar/subdir"
"/Users/hudson/tmp/bar/subdir"
Prelude System.Directory> canonicalizePath "/Users/hudson/tmp/baz/subdir"
"/Users/hudson/tmp/baz"
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4215>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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