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From: Eric Blake <ebb9 AT byu DOT net>
Subject: Re: 1.7.1: dash/ash test -x broken?
Date: Wed, 10 Feb 2010 15:37:18 +0000 (UTC)
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Cobb, Christopher (Contr) (IS <Christopher.Cobb <at> ngc.com> writes:

> $ dash -c "test -x '$JAVACMD';"' echo $?'
> 1
> 
> $ ash -c "test -x '$JAVACMD';"' echo $?'
> 1

dash and ash are identical.

> $ getfacl.exe "$JAVACMD"
> # file: /c/Program Files/Java/jdk1.5.0_18/bin/java
> # owner: Administrators
> # group: SYSTEM
> user::rwx
> group::rwx
> group:Users:r-x
> group:Power Users:rwx
> mask:rwx
> other:---
> 
> $ stat "$JAVACMD"
>   File: `/c/Program Files/Java/jdk1.5.0_18/bin/java'
>   Size: 53344           Blocks: 56         IO Block: 65536  regular file
> Device: 548b6deeh/1418423790d   Inode: 1407374883580908  Links: 1
> Access: (0770/-rwxrwx---)  Uid: (  544/Administrators)   Gid: (   18/
> SYSTEM)
> Access: 2010-02-09 16:23:09.702221400 -0500
> Modify: 2009-02-25 01:47:30.000000000 -0500
> Change: 2009-11-19 15:03:03.707455600 -0500
> 
> $ id
> uid=720693(cobbch) gid=10513(Domain_Users)
> groups=0(root),544(Administrators),545(Users),1004(SophosUser)

Yep - it's an ACL issue.  Since you (cobbch) are not the owner 
(Administrators), and your group membership (root, Administrators, Users, 
SophosUser) does not include the group owner (SYSTEM), and since the mode does 
not grant any permissions to others, dash's use of stat() thinks you have no 
rights.  But in reality, the ACLs state that anyone in group users (which 
includes you) has additional rights beyond what stat() can see, and hence 
euidaccess() (which bash uses) gives the correct answer.

I've reported this upstream.  Meanwhile, I guess that means its time for me to 
respin a dash package.  Thanks for the report.

-- 
Eric Blake
volunteer cygwin dash maintainer



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