Bug in pwd

[Eric Blake]

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POSIX now requires pwd(1) to support -L and -P, that -L is the default,
and that -L reads $PWD to verify that it is a name (possibly with symbolic
links) of the current directory.  Coreutils pwd currently implements none
of this, and behaves as though -P is the default without ever reading $PWD.

Furthermore, POSIX requires that when -P is specified, that $PWD be
updated in the calling environment to scrub all symlinks from the
environment variable that were previously set by a `cd -L' command.  I see
no possible way to implement that without relying on pwd(1) being a shell
builtin.  Bash 3.0 does not do this, I'm filing an additional bug in that
direction.  Is it worth coreutils even maintaining pwd(1) if it can't be
fully POSIX-compliant?

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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