How to disable the deletion of files in a folder, but at the same time allow the creation of files?

Question

linux

The people, how to prohibit deleting files in a folder, but at the same time allow creating files?

using: chattr +i folder files are not deleted but not created either.

Maybe there is a solution?

Answer 1

Use sticky bit.
chmod +t FOLDERNAME
Or digitally: chmod 1775 FOLDERNAME

Answer 2

As an option to create files by a user who has write permissions.
And read only to those who have only rights to read.
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Well, or chattr +i "concrete file"
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And you can't put an attribute on a folder even as a root.

Answer 3

I think this can be done with the rules of SELinux or AppArmor, forbidding the call to unlink on all files in the directory.