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This fixes the "0100 directory" problem in reverse mode,
and should be slightly faster.
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The function used to do two things:
1) Walk the directory tree in a manner safe from symlink attacks
2) Open the final component in the mode requested by the caller
This change drops (2), which was only used once, and lets the caller
handle it. This simplifies the function and makes it fit for reuse in
forward mode in openBackingPath(), and for using O_PATH on Linux.
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...when opening intermedia directories to give us an
extra layer of safety.
From the FreeBSD man page:
This flag can be used to prevent applications with elevated
privileges from opening files which are even unsafe to open with O_RDONLY,
such as device nodes.
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Sometimes want to open baseDir itself. This case
was broken, fix it.
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OpenNofollow = symlink-race-safe Open
Prepares fixing https://github.com/rfjakob/gocryptfs/issues/165
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