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From: Greg Freemyer <greg DOT freemyer AT gmail DOT com>
Date: Thu, 24 Sep 2015 12:12:47 -0400
Message-ID: <CAGpXXZJeWs33BJi7qROduZEhTx1pXXXseTbfXu+QP8+cf_r5hQ@mail.gmail.com>
Subject: Re: cygwin potentially corrupting permissions?
To: Linda Walsh <cygwin AT tlinx DOT org>
Cc: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
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Linda,

We seem to travel the same mailing lists.  This is my first time to cygwin's.

I saved your script as "lsacl.txt".  Then I used "cp lsacl.txt it" to
make a copy.

The copy is permission denied for reading.  Basic ls -l shows no
difference (as expected)

$ ls -l lsacl.sh it
----rwx---+ 1 gaf None 1630 Sep 24 12:05 it
----rwx---+ 1 gaf None 1630 Sep 24 12:00 lsacl.sh

But your script does show a difference:

$ ./lsacl.sh lsacl.sh it
[u::---,g::---,g:root:rwx,g:Authenticated
Users:rwx,g:SYSTEM:rwx,g:Users:r-x,m:rwx,o:---/] lsacl.sh
[u::---,g::r-x,g:root:rwx,g:Authenticated
Users:rwx,g:SYSTEM:rwx,g:Users:r-x,m:rwx,o:---/] it

My user id is "gaf".

fyi: I thought I knew how to read an ACL, but the above makes little
sense to me.  Note I can cat out "lsacl.sh", but I can't cat out "it".

Greg

--
Greg Freemyer
www.IntelligentAvatar.net


On Wed, Sep 23, 2015 at 10:58 PM, Linda Walsh <cygwin AT tlinx DOT org> wrote:
> Greg Freemyer wrote:
>>
>> All,
>>
>> I've noticed on 2 different machines that if I copy (cp) a file I can
>> read with cygwin, I don't have permission to read the copy.
>
> ---
>         What does the acl say?
>
>         (Attached a script, lsacl, that I use -- it works
> with linux or cygwin and allows wildcards).
>
>
> #!/bin/bash
>
> ## $Id: lsacl,v 1.5 2015-08-02 10:29:25-07 law Exp law $
> # Version 2 -- try to work with getfacl on cygwin
> #
>
>
> shopt -s expand_aliases
> alias int=declare\ -i           sub=function  string=declare
>
> gfacl=$(type -P getfacl)
>
> if ! type -f cygwin 2>/dev/null ; then
>         _un_=$(type -P uname)
>         if              [[ $_un_ ]] ; then _os_=$($_un_ -o);
>         elif    [[ -e /proc/sys/kernel ]]; then _os_=Linux;
>         else    _os_=Cygwin;
>         fi
>         if              [[ $_os_ =~ Cygwin ]]; then function cygwin () {
> return 0; }
>         else    function cygwin () { return 1; }
>         fi
>         unset _un_ _os_
>         export -f cygwin
> fi
>
> if cygwin 2>/dev/null ;then
>         [[ $gfacl ]] || { printf "FATAL: Cannot find getfacl in path\n";
> exit 1; }
>         sub gfacl () { "$gfacl" "$@"; }
> else
> ## linux version has broken semantics requiring "-p"
>         sub gfacl () { "$gfacl" -p "$@" ; }
> fi
>
> export -f gfacl
>
>
> sub facl2str {
>         string fn=${1:?"Need pathname"}
>         string s1='/^\#.*$/d; /^\s*$/d; s/\s*#.*$//;
> s/^(.)(ser|roup|ask|ther):/\1:/; y/\n/,/'
>         string facl=$(gfacl -a "$fn"|sed -r "$s1"|tr "\n" ",")
>         facl=${facl%,}
>         string dacl=$(gfacl -d "$fn"|sed -r "s/^default://; $s1"|tr "\n"
> ",")
>         dacl=${dacl%,}
>         printf "[%s/%s]\n" "$facl" "$dacl"
> }
>
>
>
> int acllen=0 maxfnln=0
> #for fn in "$@" ; do if ((maxfnln<${#fn})); then maxfnln=${#fn}; fi ; done
>
> sub acl_str () {
>         if cygwin ;then
>                 perm=$(facl2str "$fn")
>         else
>                 qfn=$(printf "%q " "$fn")
>                 out="$(chacl -l "$fn")"
>                 perm="${out#$qfn}"
>         fi
>         printf "%s\n" "$perm"
> }
>
>
> for fn in "$@"; do
>         int max=40
>         perm=$(acl_str "$fn")
>         int len=${#perm}
>         if ((len>_acl_len_)); then acllen=len; fi
>         if ((acllen>max));              then acllen=max; fi
>         printf "%-${acllen}s %s\n" "$perm" "$fn"
> done
>

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