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I am looking for a way to determine the canonical form for a file
name. Suppose that there is a file named "FILE" in the directory /
folder/, which is on an HFS+ volume: then the canonical form of the
path "/folder/file" would be "/folder/FILE". Both paths refer to the
same file, but the representation on disk is FILE.
I need to know this for the purpose of comparison, and I cannot
simply do a case-insensitive comparison because I do not know if /
folder/ is on a case-insensitive or case-sensitive volume.
I have thought of opening the file and then using fstat on the
descriptor, but is there a better way to do it?
Stat the two paths and compare the inode number for each. This is
of course subject to a race with rename, but it avoids the overhead
associated with actually opening the file.
From a broader point of view, what I need is a reliable solution for
determining if two paths refer to the same file, without assuming
anything about the filesystem on which it is located. I have searched
the archives of this list, but I could not find an answer to this
question.
That would be because there isn't one that can be reliably applied
to the namespace.
File/path names are indices, they don't tell you anything about the
actual structure of the data being indexed. As such, the information
you're looking for simply isn't there.
= Mike
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