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 Forum index » Off-Topic Area » Programming
Using whiteouts
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jpeps

Joined: 31 May 2008
Posts: 3217
PostPosted: Fri 23 Dec 2011, 16:10    Post subject:  Using whiteouts  
I was experimenting with a script that writes whiteouts for files on a list, so that I can try out varying combinations by simply adding/removing the whiteouts. The whiteouts (in the "snap" layer) save (at least on my grub install) across boots, so I can restore or delete the files anytime I want.
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jpeps

Joined: 31 May 2008
Posts: 3217
PostPosted: Sat 24 Dec 2011, 03:47    Post subject:  
Kind of interesting playing with this to learn about whiteouts. Checking it "ON" sets a new mark. Any new files created in /usr will get a whiteout when you push the "Block" button. They can then be permanently deleted or restored.

If you reboot, the whiteout files aren't in the "save" layer, so they won't work. On a flash install, I don't think anything is saved from the snap layer, so even the whiteouts will be gone. On a regular grub install, the whiteouts remain, and the files can be restored or deleted as before the boot.

I limited the files to /usr for safety reasons, but other directories could be included.
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big_bass

Joined: 13 Aug 2007
Posts: 1742
PostPosted: Mon 26 Dec 2011, 12:32    Post subject:  
jpeps

white outs is an interesting subject since we have mounted sfs'

a lot of things have already been done
this will interest you with more information

Dougal author
http://www.murga-linux.com/puppy/viewtopic.php?t=39276&sid=48cb760c349be6d7359cb20ac12510b9
note that there is no package linked it was removed but....


this has a link to the original package
Ray MK posted a link
http://www.murga-linux.com/puppy/viewtopic.php?t=66362&start=10
note I was credited for both links on this page but I did not write the white outs script
the author of that is Dougal * I however wrote the memory cleaner linked there


Joe
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jpeps

Joined: 31 May 2008
Posts: 3217
PostPosted: Mon 26 Dec 2011, 17:53    Post subject:  
big_bass wrote:
jpeps

white outs is an interesting subject since we have mounted sfs'

a lot of things have already been done
this will interest you with more information


Hi Joe,

I recall getting involved in this during the development of sfs-on-the-fly, and wrote my own scripts to monitor and/or delete them so things would load correctly. Since we have them, I thought maybe there was some other usefulness.

I updated this so it works with all directories. Various buttons:

set mark: check to add a new mark. New files are anything written after setting the mark.

Files: finds new files in selected directory (can edit)
Build: Adds files from the "files" list to a build list (can edit)
Block: Creates whiteouts for files on the list. For "/mnt" directory, it simply moves files to .files.swp so they can be restored if desired.
Restore: Restores files by removing the whiteouts, or in /mnt/ moving the .swp file back to it's original name
Delete: Deletes the whiteout and files.

edit: one use is easy management of .mozilla caches

note: for cli usage, run "no-save -h" for options (works for /usr files).
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sunburnt


Joined: 08 Jun 2005
Posts: 5087
Location: Arizona, U.S.A.
PostPosted: Tue 27 Dec 2011, 00:27    Post subject:  
Whiteouts and other necessities of unions are signs of induced complication.
When you have to patch holes in something like this, it`s not a good thing.

Unions work well and have come a long way, but they`re not necessary.
In the spirit of KISS... Why complicate things when it`s not an advantage?
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jpeps

Joined: 31 May 2008
Posts: 3217
PostPosted: Tue 27 Dec 2011, 01:45    Post subject:  
sunburnt wrote:

In the spirit of KISS... Why complicate things when it`s not an advantage?


To use it to my advantage
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sunburnt


Joined: 08 Jun 2005
Posts: 5087
Location: Arizona, U.S.A.
PostPosted: Tue 27 Dec 2011, 23:34    Post subject:  
Hi jpeps; I understand what you mean.

I`m sure you understand what I mean also... Cool
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