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Date:	Mon, 10 Jan 2022 08:13:10 +0900 (JST)
From:	Tatsuro MATSUOKA <tmacchant2 AT yahoo DOT co DOT jp>
To:	moss AT cs DOT umass DOT edu, "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-ID:	<13484389.1228247.1641769990069.JavaMail.yahoo@mail.yahoo.co.jp>
Subject:	Re: permission 600
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> ----- Original Message -----
> 
> From: "Eliot Moss" 
> To: "cygwin
> Date: 2022/01/09 æ—¥ 20:26
> Subject: Re: permission 600
> 
> 
> On 1/9/2022 6:11 AM, Tatsuro MATSUOKA wrote:
> >> ----- Original Message -----
> >>
> >> From: "Thomas Wolff"
> >> Date: 2022/01/09 æ—¥ 17:51
> >> Subject: Re: permission 600
> >> Am 09.01.2022 um 07:10 schrieb Tatsuro MATSUOKA:
> >>>> ----- Original Message -----
> >>>>
> >>>> From: "Marco Atzeri"
> >>>> To: "cygwin> Date: 2022/01/09 æ—¥ 14:39
> >>>> Subject: Re: permission 600
> >>>>
> >>>>
> >>>> On 09.01.2022 06:28, Tatsuro MATSUOKA wrote:
> >>>>> $ echo aaa > test.txt
> >>>>> $ ls -l  test.txt
> >>>>> -rw-r--r-- 1 user user 4 Jan  9 14:07 test.txt
> >>>>> $ chmod 600 test.txt
> >>>>> $ ls -l test.txt
> >>>>> -rw-r--r-- 1 user user 4 Jan  9 14:07 test.txt
> >>>> it works for me
> >>>>
> >>>> $ ls -l test.txt
> >>>> -rw-r--r-- 1 Marco Kein 4 Jan  9 06:35 test.txt
> >>>>
> >>>> $ chmod 600 test.txt
> >>>>
> >>>> $ ls -l test.txt
> >>>> -rw------- 1 Marco Kein 4 Jan  9 06:35 test.txt
> >>>>
> >>>> I suspect that having user and group called same
> >>>> is the clue
> >>>>
> >>> Ah! Thanks!
> >>>
> >>> Tatsuro
> >> Did you verify it by using different names?
> >> It can hardly be an explanation by POSIX means. If so, it must be some
> >> weird consequence of Windows-specific stuff. Maybe a workaround could be
> >> found for cygwin?
> > 
> > I made another windows account and sign in PC with different user name.
> > But result for chmod 600 gave the same results.
> > I found the workaround for jupyter by readind the code of "paths.py" in jupyter.
> 
> You can find the underlying Window permissions using icacls.  Cygwin
> has to set up some funky work-arounds to model some of the POSIX
> permissions - the two models are substantially different.  Sometimes
> clearing back to some nominal Windows permissions and applying
> chmod again helps.  "setfacl -b" can help clear out permissions,
> etc.  Don't forget that permissions can be inherited from the
> containing directory as well.
> 
> Other people may be able to offer more specific guidance, especially
> if you post the output of icacls.
> 
> Best - Eliot Moss
> 
Because my C drive is not enough, I installed cygwin into USB drive and make home directory on it.
chmod issue are story files on the usb drive.
On files on C drive, chmod 600 works as expected.

My workround for jupyter changed :
export JUPYTER_ALLOW_INSECURE_WRITES=true
=>
export JUPYTER_RUNTIME_DIR=/cygdrive/c/Users/user/AppData/Local/Temp  
(/cygdrive/c/Users/user/AppData/Local/Temp "tmp" environmental variable value in my current environment.)

For another usb drive, chmod works as expected.
chmod does not work  => FAT32
chmod works => NTFS

I back up all files to the external HDD and  format FAT32 drive to NTFS drive and back them.

Thanks!

Tatsuro


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