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Subject: Re: "test" producing unexpected results after "chmod"
To: cygwin AT cygwin DOT com
References: <5c1f242b DOT 1c69fb81 DOT 2721c DOT 076d AT mx DOT google DOT com>
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID: <18523ac3-2c1f-aaaa-7719-d97fe7794858@gmail.com>
Date: Sun, 23 Dec 2018 07:15:17 +0100
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Am 23.12.2018 um 06:59 schrieb Steven Penny:
> With Linux, these commands produce expected results:
> 
>     $ cd /tmp
>     $ touch alpha.txt
>     $ test -r alpha.txt; echo "$?"
>     0
>     $ chmod -r alpha.txt
>     $ test -r alpha.txt; echo "$?"
>     1
>     $ chmod +r alpha.txt
>     $ test -r alpha.txt; echo "$?"
>     0
> 
> However with Cygwin, unexpected results are produced:
> 
>     $ cd /tmp
>     $ touch alpha.txt
>     $ test -r alpha.txt; echo "$?"
>     0
>     $ chmod -r alpha.txt
>     $ test -r alpha.txt; echo "$?"
>     0
> 
> It seems Cygwin is not able to produce non-readable files.
> 

you are missing the point that the Windows filesystem
has additional ACL permission as indicated by the "+"
in the ls output.
If you remove those permissions the test case replicate
Linux results.


$ mkdir pippo

$ ls -l | grep pippo
drwx------+ 1 Marco Kein    0 Dec 23 07:03 pippo
           ^ ACL additional permissions


$ getfacl pippo/
# file: pippo/
# owner: Marco
# group: Kein
user::rwx
group::---
other::---
default:user::rwx
default:group::r-x
default:other::r-x

$ setfacl -k pippo

$ ls -l |grep pippo
drwx------  1 Marco Kein    0 Dec 23 07:05 pippo

$ getfacl pippo/
# file: pippo/
# owner: Marco
# group: Kein
user::rwx
group::---
other::---


$ cd pippo
$ touch alpha.txt
$ test -r alpha.txt; echo "$?"
0

$ chmod -r alpha.txt
$ test -r alpha.txt; echo "$?"
1

$ chmod +r alpha.txt
$ test -r alpha.txt; echo "$?"
0

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