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Help with ACL and POSIX permissions for external flash/HD.

I have problem with permission (files stand non-readable sometimes) on
host when "rsync" or "hg clone/pull" done on external drive
on another host.

I read
partially understand text but don't know how to resolve
my problem...

From manual:

  To use Windows security correctly, Cygwin depends on the files
  /etc/passwd and /etc/group

So if I carry external storage from one host to another
does second Cygwin stop understand permission on external storage

I would like to see if all Cygwin operation set 666 permission
for files and 777 for directories for external drive and
don't set any host specific owners so I always can access to files.

It is possible that Cygwin set owners only from well knows SIDs?
Like S-1-1-0 (everyone), S-1-5-32-544 (Administrators)
so this IDs valid on any Windows host.

I try:

  $ mount -o noacl h:  /mnt
  $ mount
C:/opt/cygwin/bin on /usr/bin type ntfs (binary,auto)
C:/opt/cygwin/lib on /usr/lib type ntfs (binary,auto)
C:/opt/cygwin on / type ntfs (binary,auto)
H: on /mnt type ntfs (binary,noacl,user)
C: on /cygdrive/c type ntfs (binary,posix=0,user,noumount,auto)
D: on /cygdrive/d type ntfs (binary,posix=0,user,noumount,auto)

ï  $ umask 0111
  $ touch foo
  $ pwd
  $ mkdir dir
  $ touch dir/file

$ ls -ld foo dir dir/file
drw-r--r-- 1 user passwd/group_GID_clash(513/10513) 0 ÐÐÑ 30 23:05 dir
-rw-r--r-- 1 user passwd/group_GID_clash(513/10513) 0 ÐÐÑ 30 23:05 dir/file
-rw-r--r-- 1 user passwd/group_GID_clash(513/10513) 0 ÐÐÑ 30 23:04 foo

  $ icacls foo
  foo ÐÑÐ:(I)(F)

  $ icacls dir
  dir ÐÑÐ:(I)(F)

  $ icacls dir/file
  dir/file desktop\user:(F)

Look fine, is that way solve my problem?

Is it right to update /etc/fstab to:

h: /cygdrive/h ntfs binary,noacl,user 0 0

How can I set umask? In .bashrc? What if I run
Cygwin program from cmd?

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