Currently, ExcludeFiles= supports excluding directories on the host from being copied. Let's extend this to also support preventing files from being copied into specific directories in the partition by adding a new option ExcludeFilesTarget=. An example where this is useful is when setting up btrfs subvolumes in the top level that are intended to be mounted into specific locations, so /usr would be stored in @usr, /home in @home, .... To accomplish this, we need to copy /usr to @usr and prevent any files from being copied into /usr in the partition, which with this commit, we'd be able to do as follows: ``` [Partition] CopyFiles=/usr:@usr ExcludeFilesTarget=/usr ```
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