How do you set user work as root in Linux, when the bash script runs via Java code

Question

Suppose my bash file contains

chmod -R 777 $backup_files/app/webroot/uploadedFiles/

It works fine when I run it through root permission using /permission.sh but when I try to run this bash script via java code like

        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec("/permission.sh");
        printBufferedReaderOutputFromProcess(process);
        process.waitFor();

It gives me the following error:

chmod: changing permissions of `/home/app/webroot/uploadedFiles/A.jpg': Operation not permitted

What can I fix it?

Duplicate of make linux directory writable using bash command through java code — ziesemer
– ziesemer, Commented Dec 15, 2011 at 14:20

Peter Lawrey · Accepted Answer · 2011-12-15 08:57:23Z

1

I suspect you haven't use sudo before, however an alternative to using the setuid on the script is to give the user the right to sudo the script as root. i.e.

sudo permisions.sh

This runs as root can can be run without asking a password. You have to set this up in sudoers.conf

answered Dec 15, 2011 at 8:57

Peter Lawrey

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2 Comments

dma_k Over a year ago

@PeterLawrey: Have you ever heard about setuid scripts?!? OMG! However sudo advise is OK (however sudo requires full path to the script if it is not in PATH e.g. sudo ./permisions.sh).

Peter Lawrey Over a year ago

My first suggestion was to use a setuid script, however these can be hard to control who can run it and manage in any centralise way.

ziesemer · Accepted Answer · 2011-12-15 03:18:22Z

0

How are you running your Java code? Is it stand-alone, or running in a web container like Tomcat? If the later, it's probably running as a user that doesn't have permissions to the directory you're trying to change.

answered Dec 15, 2011 at 3:18

ziesemer

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5 Comments

Pritom Over a year ago

Yes, I am runnig java code through tomcat6 and user name is tomcat, I added the following line in sudoers tomcat ALL=(ALL) NOPASSWD: ALL

ziesemer Over a year ago

Are you calling sudo somewhere, maybe as part of permission.sh? (It doesn't just work automatically.)

dma_k Over a year ago

Pritom: You should change your Jave code to runtime.exec("sudo /permission.sh");. Perhaps being more strict is good idea: tomcat ALL = NOPASSWD: /permission.sh.

Pritom Over a year ago

When I write runtime.exec("sudo /permission.sh"); then it shows sudo: sorry, you must have a tty to run sudo. And when I write this in sudoers tomcat ALL = NOPASSWD: /permission.sh then it shows chmod: changing permissions of /app/webroot/uploadedFiles/': Operation not permitted

ziesemer Over a year ago

It may be possible to resovle the "sorry, you must have a tty to run sudo" issue by adding !requiretty to the directive in your sudoers file. However, similar to stackoverflow.com/questions/8410360/… , I really question the overall approach here. Maybe this is an initial setup that you need to complete outside of Java.

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