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Date:	Mon, 10 Jan 2022 20:10:36 +0900 (JST)
From:	Tatsuro MATSUOKA <tmacchant2 AT yahoo DOT co DOT jp>
To:	Thomas Wolff <towo AT towo DOT net>, "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-ID:	<996962702.1253083.1641813036736.JavaMail.yahoo@mail.yahoo.co.jp>
Subject:	Re: permission 600
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Reply-To:	Tatsuro MATSUOKA <matsuoka AT nuce DOT nagoya-u DOT ac DOT jp>
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> ----- Original Message -----
> From: "Thomas Wolff" 
> To: "cygwin@
> Date: 2022/01/10 月 08:28
> Subject: Re: permission 600
> 
> 
> 
> Am 10.01.2022 um 00:13 schrieb Tatsuro MATSUOKA:
> >> ----- 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 was about to ask...
> > I back up all files to the external HDD and  format FAT32 drive to NTFS drive and back them.
> You can actually convert a USB drive to NTFS without copying files and 
> reformatting,
> using $SYSTEMROOT/System32/convert
> 
I will try after backup. 
Thanks!

Tatsuro


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