Version Roll Back

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+1 Q:

Version Roll Back

I am doing a concept in linux in which i want to do version rollback for an app installed in linux. Is it possible??

For eg I have an application named X with version 1.1 I get an update. It changes it to version 1.2 I note what all the packages in the app going to be modified. Then i save them and apply the changes. Now after sometime due to some problems I want to switch back to version 1.1 If i undo the changes and make the entire solution will the rollback be done?

+2 A:

The easiest and common way in Unix is to install them in separate directories, eg "/usr/bin/MyApp.1.2.3" and "/usr/bin/MyApp.1.2.4" then create a link to the one to use "/usr/bin/Myapp".
Changing versions is then just a matter of moving the link.

Martin Beckett 2009-10-05 13:33:18

Yeah i understand these things but my project deals with optimization. I had to optimize the disk space. If u consider the difference between two versions it won't be much. So just noting the changes done and saving them will help minimize the disk space. – DG 0 secs ago

DG 2009-10-05 13:49:31

Then just install using SVN-export. If this is an app being distributed to customers than most of the packaging tools rpm/deb/etc can undo an installation

Martin Beckett 2009-10-05 14:22:09

You don't need to invent anything. Just keep the packages you install around. If you want to go back, uninstall the current version and install the previous package again.

Aaron Digulla 2009-10-05 13:34:13

DG 2009-10-05 13:48:54

openSUSE creates diffs between RPMs. Check this project: http://freshmeat.net/projects/deltarpm/

Aaron Digulla 2009-10-05 14:07:50

ansaurus

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