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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Screwed up permissions, ownership, attributes on large fs. How to reset? (lemmy.dbzer0.com)

submitted 1 month ago* (last edited 1 month ago) by laserjet@lemmy.dbzer0.com to c/linux@lemmy.ml

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I have been playing around with chmod, chown, setfacl and special bits trying to get multiple system/full users in same group correct access permissions to my media collection.

But I've messed it up somehow and now I'm having weird problems that are hard to track.

I would like to set my whole collection back to the defaults.

What is the best way to do this?

One problem I've had when making changes to so many files is the process seems to go forever without completing. Eventually it gets killed so my filesystem has variable attributes throughout. how can this be worked around?

I want everything to be owned by myuser, group media, everything else default I will sort it from there once I have a fresh slate.

And is there a way to backup these attributes only? I don't have enough storage to backup the files themselves.

It is Debian with ext4 filesystem.

Edit to add: Media collection is on its own separate drive/filesystem; this has no impact on anything else on the computer.

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[–] mina86@lemmy.wtf 7 points 1 month ago* (last edited 1 month ago) (8 children)

As root:

cd /filesystem/in/question
chown myuser:media -R /filesystem/in/question
find -exec chacl -B -- {} +
find -exec chmod 644 -- {} +
find -type d -exec chmod 755 -- {} +

[–] laserjet@lemmy.dbzer0.com 3 points 1 month ago (5 children)

I'm not familiar with chacl ("change the access control list of a file or directory"). Is is similar to setfacl ("set file access control lists")? A matter of preference/habit?

It seems like -B does "Remove all ACLs". Which I guess is what I am asking for? Files on linux are OK to have no ACLs?

About the find ... {} +, I see {} +

runs the specified command on the selected files, but the command line is built by appending each selected file name at the end; the total number of invocations of the command will be much less than the number of matched files.

So does it wait until it has found all the matches to run the command as a giant batch instead of running it as it finds matches?

[–] mina86@lemmy.wtf 3 points 1 month ago

So does it wait until it has found all the matches to run the command as a giant batch instead of running it as it finds matches?

Indeed. If possible, it is typically what you want (as opposed to find ... -exec ... {} \; which runs command for each found file) since it will run faster. You want find ... -exec ... {} \; if the command you’re executing can run on single file only or you’re dealing with legacy system without -exec ... {} + support.

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