"/" in filename confuses handling of spec. chars on non-managed mount

[Érsek László <lacos at chello dot hu>]

Hi,

I'm running "CYGWIN_NT-5.1 1.5.24(0.156/4/2) 2007-01-31 10:57".

If I try to create a regular file with a colon (:) in its name, cygwin 
refuses it with ENOENT (rightly so):

    $ echo test >"a:b"
    -bash: a:b: No such file or directory

However, if I put, in addition, a slash in the name:

    (
      set -e -C -x

      mkdir test
      df -m test
      dd if=/dev/zero bs=4096 count=1024 >'test/a:b'
      df -m test
      ls -lsn 'test/a:b'
      ls -lsn test
    )

Standard output and error:

    + mkdir test

    + df -m test
    Filesystem           1M-blocks      Used Available Use% Mounted on
    C:\cygwin                57232      9100     48132  16% /

(Redirection not shown below)

    + dd if=/dev/zero bs=4096 count=1024
    1024+0 records in
    1024+0 records out
    4194304 bytes (4.2 MB) copied, 0.08 s, 52.4 MB/s

    + df -m test
    Filesystem           1M-blocks      Used Available Use% Mounted on
    C:\cygwin                57232      9104     48128  16% /

    + ls -lsn test/a:b
    4096 -rw------- 1 1003 513 4194304 Oct 16 16:14 test/a:b

No problem until this point, but:

    + ls -lsn test
    total 0
    0 -rw------- 1 1003 513 0 Oct 16 16:14 a

Shouldn't the redirection used with the dd command fail with ENOENT? The 
file system containing the directory "test" is mounted without the 
"managed" mount option.

This doesn't depend on the shell, I can reproduce it with a simple C 
program.

Thank you
lacos

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