Re: [OT] call gifsicle via Java process

[Jerry W. Walker]

Hi, Ute,

On Feb 10, 2007, at 11:58 AM, Ute Hoffmann wrote:
Hi Jerry,
thank you very much for your help. I did as you told me, tried to  
su to appserver but could not. (I was still root after the su).

I haven't tried this as root, but if you can log in as a non-root  
user with admin and sudo privileges, execute the following command:

sudo -u appserver sh

That should put you in a unix shell as appserver. You can confirm  
this by going into a directory for which appserver has no write  
permissions and trying the Unix touch command to create a new file.  
When you've confirmed that you're appserver, try to execute your  
gifsicle command again within the directory that WO tries to execute  
it. If that works, then you should start examining appserver's shell  
environment (which should have been printed out by the small shell  
script I gave you.

So I made the sh and executed it and got this as whoami:

I am:
appserve tty??    Feb 10 17:45

Is it right that it says appserve? Is that just shortened or is the  
user really appserve (without r)?

No, it's not right, it just truncates to 8 characters. You were  
right, it's appserver.

I am executing within the directory:
/Library/WebObjects/Applications/ttcmsboard.woa

right. The image files I try to work on are created previously by  
the same WOApp via another exec talking to imageMagick. The user  
appserver has all rights on them, they belong to him, to be precise.

Yes, but does appserver have permissions at the directory level to  
create a new file in that directory?

I use imageMagick extensively in this component and all calls work  
fine, overwriting the existing image whenever needed. So  
ImageMagick seems to have read and write rights.

Though I doubt it, it's possible that ImageMagick has the suid bit  
set and is running as an suid program with root permissions set.

Any idea? The call? perhaps the call is faulty?

I tend to doubt it, but it's possible.

Regards,
Jerry


Am Samstag, 10.02.07 um 15:43 Uhr schrieb Jerry W. Walker:

HI, Ute,

This sounds very much like a permissions problem. It looks like  
gifsicle is throwing that first "Error with conversion" because it  
can't open a file which is cascading to the other errors.

You say that you are logged in as root. I presume you mean that  
when you "...open a terminal on the server and copy..." you are  
logged in as root. If that's the case, my first question is what  
user is your WO app running under?

When your WO app is running, do a ps command on Terminal to see  
what user it is running under. Then do an "su" command to that  
user on your terminal and try running the gifsicle command  
manually again as that user.

The other possibility (less likely) is that the user environment  
for your running WO app is missing some critical parameter for  
gifsicle. To test that, you might copy the following to a shell  
script:

#! /bin/sh
{
        echo "I am:"
        who am i
        echo "\nI am executing within the directory:"
        pwd
        echo "\nMy environment is:"
        env
} > /tmp/testoutput.txt

If you exec that little shell script from within your WOApp  
instead of gifsicle, it should answer all of the above questions.  
You will find the answers, of course, at /tmp/testout.txt.

Regards,
Jerry

On Feb 10, 2007, at 5:56 AM, Ute Hoffmann wrote:

Hallo,
I'm sorry for this off topic post, but im pulling my hair after  
hours of testing and looking and perhaps someone sees what I miss.

I need to call gifsicle from a java process to optimize .gif  
images (as imageMagick fails to do so and getting it working with  
ImageMagick  seems to either need a very old IM version or some  
tuning of the tifflib. I looked into it but descided not to).

This is what I want to do:

call a exec from my java function which hands over the correct  
infos to gifsicle and gifsicle reading the file in and writing it  
optimized back to disk.

This is the error I get:
Fehler bei der KonversionTTGifsicle$Exception: Could not exec  
process: /usr/local/bin/gifsicle < /Library/WebServer/Documents/ 
cmsboard/ttwcmsdaten/bilder/tmp/26basispaket9.gif > /Library/ 
WebServer/Documents/cmsboard/ttwcmsdaten/bilder/tmp/ute_nn.gif:  
not found. invocation line: /usr/local/bin/gifsicle < /Library/ 
WebServer/Documents/cmsboard/ttwcmsdaten/bilder/tmp/ 
26basispaket9.gif > /Library/WebServer/Documents/cmsboard/ 
ttwcmsdaten/bilder/tmp/ute_nn.gif. error output: null

The file is there. When I open a terminal on the server and copy
/usr/local/bin/gifsicle < /Library/WebServer/Documents/cmsboard/ 
ttwcmsdaten/bilder/tmp/26basispaket9.gif > /Library/WebServer/ 
Documents/cmsboard/ttwcmsdaten/bilder/tmp/ute_nn.gif

into the terminal gifsicle does as asked. Only difference aside  
from java involved/not involved: I'm logged in as root

So:
a) Do you think that what I see here is a permission problem
b) Has someone experience with calling gifsicle from java and  
could perhaps give me a code example of the call.

Thank you for some insight.

Regards

Ute

P.S:
This is my call:

String[] cmdArray = new String[] {
"/usr/local/bin/gifsicle "+"< "+sourceFilePath+" > "+outFilePath
};

NSMutableArray stdErrContents = new NSMutableArray();
NSMutableArray stdOutContents = new NSMutableArray();
int resultCode;
try {
resultCode = exec( cmdArray, stdOutContents, stdErrContents );
}
catch ....
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--
__ Jerry W. Walker,
   WebObjects Developer/Instructor for High Performance Industrial  
Strength Internet Enabled Systems

    [EMAIL PROTECTED]
    203 278-4085        office






--
__ Jerry W. Walker,
   WebObjects Developer/Instructor for High Performance Industrial  
Strength Internet Enabled Systems

    [EMAIL PROTECTED]
    203 278-4085        office



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