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POIn python on OSX with HFS+ how can I get the correct case of an existing filename?
 

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  1. POIn python on OSX with HFS+ how can I get the correct case of an existing filename?
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    <p>I am storing data about files that exist on a OSX HFS+ filesystem. I later want to iterate over the stored data and figure out if each file still exists. For my purposes, I care about filename case sensitivity, so if the case of a filename has changed I would consider the file to no longer exist.</p> <p>I started out by trying</p> <pre><code>os.path.isfile(filename) </code></pre> <p>but on a normal install of OSX on HFS+, this returns True even if the filename case does not match. I am looking for a way to write a isfile() function that cares about case even when the filesystem does not.</p> <p>os.path.normcase() and os.path.realpath() both return the filename in whatever case I pass into them.</p> <p>Edit:</p> <p>I now have two functions that seem to work on filenames limited to ASCII. I don't know how unicode or other characters might affect this.</p> <p>The first is based off answers given here by omz and Alex L.</p> <pre><code>def does_file_exist_case_sensitive1a(fname): if not os.path.isfile(fname): return False path, filename = os.path.split(fname) search_path = '.' if path == '' else path for name in os.listdir(search_path): if name == filename : return True return False </code></pre> <p>The second is probably even less efficient.</p> <pre><code>def does_file_exist_case_sensitive2(fname): if not os.path.isfile(fname): return False m = re.search('[a-zA-Z][^a-zA-Z]*\Z', fname) if m: test = string.replace(fname, fname[m.start()], '?', 1) print test actual = glob.glob(test) return len(actual) == 1 and actual[0] == fname else: return True # no letters in file, case sensitivity doesn't matter </code></pre> <p>Here is a third based off DSM's answer.</p> <pre><code>def does_file_exist_case_sensitive3(fname): if not os.path.isfile(fname): return False path, filename = os.path.split(fname) search_path = '.' if path == '' else path inodes = {os.stat(x).st_ino: x for x in os.listdir(search_path)} return inodes[os.stat(fname).st_ino] == filename </code></pre> <p>I don't expect that these will perform well if I have thousands of files in a single directory. I'm still hoping for something that feels more efficient.</p> <p>Another shortcoming I noticed while testing these is that they only check the filename for a case match. If I pass them a path that includes directory names none of these functions so far check the case of the directory names.</p>
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      1. POIn python on OSX with HFS+ how can I get the correct case of an existing filename?
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    1. COI don't know if it is an option for your application, but it is possible to convert HFS+ to a case sensitive file system. Or you can use UFS.
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    2. COIn my situation changing the filesystem type is not an option.
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      1. USKeith
 

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