#240 TIP118: expand [file attributes] on BSD & Darwin

[Daniel A. Steffen]

The attached patch adds suport for [file attributes -
readonly] (i.e. the user immutable flag) on any unix system
supporting chflags(), this includes BSD >= 4.4 and Darwin/
MacOSX (where this is the flag corresponding to the file
locked state in HFS+).

On systems supporting getattrlist(), i.e. currently only pure
Darwin & Mac OSX, the patch adds support for the
MacOS9 style [file attributes -creator -type -hidden] via
POSIX level APIs that don't require linking with Carbon.

Tested the patch on the SF compilefarm on
[Alpha] Linux 2.4 (Debian 3.0), where none of the APIs
are available and no ill effects ensue
[x86] FreeBSD (4.7-RC), where chflags() is available and
[file attributes -readonly] can successfully be interrogated,
(but not set due to permission issues at sourceforge)
as well as on both MacOSX 10.1.5 and 10.2 where the
complete functionality is available.

docs will need changing if this is accepted for checkin,
that's not in the patch yet.

It'd be great if this could make it into 8.4.1

[Daniel A. Steffen]

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updated patch with fixes to Tcl_GetOSTypeFromObj &
Tcl_NewOSTypeStringObj to deal properly with strings of length
0-4.

[Daniel A. Steffen]

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updated patch with fixes and resource fork support (on Darwin):
- [file attributes -rsrclength] attribute added, can be retrieved as
well as set to 0 (to strip the resource fork).
- [file attributes] changed to no longer abort on errors when
retrieving all possible attributes, now returns just those attributes
that could be read witout error.
- [file copy] preserves Finder attributes and resource fork.
- macRoman encoding used in OSType<->string funcs.

[Daniel A. Steffen]

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updated patch with:
- documentation changes
- classic mac port of attribute -rsrclength
- fixes to classic mac OSType string representation
- get/setattrlist now follow symlinks
- [file attributes] error handling fix.

[Daniel A. Steffen]

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Updated patch to the current 8.5a0 HEAD, since the old patch
didn't apply completely cleanly anymore.
To clarify things, renamed occurrences of "Finder" to "MacOSX"
in static proc names (still slightly inaccurate because everything
will also work on a pure Darwin system).

[Daniel A. Steffen]

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assigning to Jeff for review in his capacity as co-maintainer for
"35. File System".

[Daniel A. Steffen]

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attached updated patch implementing Mac OS X specific parts
of TIP 118 in a separate file.

[Vince Darley]

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This new patch looks fine to me, as one of the fs
maintainers.

[Vince Darley]

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I did a fair amount of testing on this last night, and the
patch looks good. Minor quibble is it appears to
introduce a few compiler warnings, but I think we
should apply asap.

[Daniel A. Steffen]

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updated the patch so that it applies cleanly to the current HEAD

Jeff, both Vince and Jim have approved the patch, did you want
to take a look at this or can I go ahead and commit?

[Donal K. Fellows]

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Jim and Vince both like it? Then it's probably good enough
for me too. Stop dithering and commit to the HEAD. But DO
NOT apply this patch to the 8.4 branch, which should be
feature-frozen on all platforms.

[Daniel A. Steffen]

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updated patch with tests of new TIP118 features added (in
unixFCmd.test and new macOSXFCmd.test).

committed to HEAD.

[Daniel A. Steffen]

patch implementing TIP 118