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Date:	Sun, 15 Nov 2009 13:51:41 -0800 (PST)
From:	aputerguy <nabble AT kosowsky DOT org>
To:	cygwin AT cygwin DOT com
Subject:	Seems like treatment of NTFS ADS (foo:bar) changed between 1.5 and 1.7 but not mentioned in What's Changed
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Cygwin 1.7 seems to have lost support for NTFS Alternative Data Streams --
which it seems not to either create or read (vs. Cygwin 1.5 behavior) --
specifically,

$ echo "dog" > foo:bar
$ echo "cat" > foo:baz

$ cat foo:bar
dog

$ cat foo:baz
dog

In Cygwin 1.5
$ ls -s foo*
0 foo

$ ls -1s foo:bar
1 foo:bar

$ ls -1s foo:baz
1 foo:baz

and explorer lists a single 0 byte file

In cygwin 1.7
$ ls -1s foo*
1 foo:bar
1 foo:baz

Which might seem ok,
*But* now explorer shows two files
foo[]bar
foo[]baz
where [] is a square box indicating an illegal symbol.

Basically it seems that rather than using the NTFS ADS, that cygwin 1.7 is
treating ":" as a valid symbol for file names and is actually creating two
separate files.

Perhaps even worse, cygwin 1.7 can't seem to read NTFS ADS files created on
1.5 (nor do I see how to create NTFS ADS with 1.7)
i.e., if I create 'foo' as above on 1.5 and try to read it on 1.7, I get:

$ ls -1s foo*
0 foo

$ cat foo
$

$ cat foo:bar
cat foo:bar: No such file or directory

$ cat foo:baz
cat foo:bar: No such file or directory

Conversely, foo created in 1.7 also gives 2 separate foo???bar and foo???baz
in 1.5

So again it seems like:
1]  1.7 treats ":" like a regular filename symbol and creates a regular file
2] 1.7 can't read NTFS ADS since as above it sees ":" as just a regular
character.

I imagine this was done for POSIX compliance but does this mean that there
is no longer support for NTFS ADS and that such files are neither creatable
nor readable under 1.7?
Also, shouldn't this be documented in "What's changed"
-- 
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Sent from the Cygwin list mailing list archive at Nabble.com.


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