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atomicc.rb: Don't assume we may chown/chmod a file.
Previously this code just assumed it is capable of changing the file ownership, both user and group. This will fail in a lot of scenario's unless: * The process is run as a superuser (root); * The owning user and group are already set to the user and group we're trying to chown to; * The user chown'ing only changes the group to another group it is a member of. If either of those conditions are not met the filesystem will simply deny the operation throwing an error. It is also not always possible to do a chmod, there might be a SELinux policy or another limitation preventing the user to change the file mode. To this end the chmod call has also been added to the rescue block. I've also added a little comment above the chmod command that doing a chmod on a file which has an ACL set will cause the ACL to be recalculated / modified.
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