Why does canonicalize call collapse after realpath? (original) (raw)

Martin Buchholz martinrb at google.com
Wed Apr 30 23:33:52 UTC 2014

canonicalize_md.c does:

/* First try realpath() on the entire path */
if (realpath(original, resolved)) {
    /* That worked, so return it */
    collapse(resolved);
    return 0;
}

And collapse promises to remove /./ and /../ BUT realpath should have already done that:

http://pubs.opengroup.org/onlinepubs/009696899/functions/realpath.html The realpath() function shall derive, from the pathname pointed to by file_name, an absolute pathname that names the same file, whose resolution does not involve '.', '..', or symbolic links.

(although it's true that collapse is not the expensive part of the operation...)

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