[jboss-dev] Symlinks and JBoss AS ./bin/*.sh scripts

David M. Lloyd david.lloyd at redhat.com
Mon Nov 29 10:59:36 EST 2010

On 11/29/2010 08:04 AM, Emmanuel Bernard wrote:
> On 28 nov. 2010, at 23:03, David M. Lloyd wrote:
>> On 11/28/2010 10:18 AM, Emmanuel Bernard wrote:
>>> Hey guys,
>>> Over the week-end I've packaged JBoss AS 6 into HomeBrew (a Mac OS X packaging system made of git and ruby).
>>> I've discovered that our scripts are not symlinks friendly and will fail (often not finding the jars).
>>> I've fixed the issue but I wanted to get a review of my work. Let me know if you thing there could be a problem, otherwise I'll apply them to SVN.
>>> [...]
>>>    ls=`ls -ld "$PRG"`
>>>    link=`expr "$ls" : '.*->   \(.*\)$'`
>> This is fragile I think.  It'd probably be better to use "readlink"
>> instead, whose actual purpose is to read links.
> I've tried your approach but I had a couple of issues. The main one is that readlink -f (recursive) is not standard across all platforms. The second issue I had was that readlink sometimes return links to the script basedir, sometimes as absolute. I imagine I could circumvent issue 2 (I've something for issue 1) but the fix will likely end up as weak as the original proposal (that comes from mvn, tomcat and co, so I imagine is decently battle tested).
> Is that worth the work?

I guess it depends on how sure you are that "ls" will always output the 
link target after a "->".  I guess we could always try it and see if 
anyone complains.

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