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overlay: use idmapped lower layers where supported #1180

Merged
merged 1 commit into from Apr 12, 2022
Merged

overlay: use idmapped lower layers where supported #1180

merged 1 commit into from Apr 12, 2022

Commits on Apr 8, 2022

  1. overlay: use idmapped lower layers where supported 

    use idmapped mounts for the overlay lower layers when the kernel
supports them.

For each lower directory with ID=0...N-1, it creates a idmapped mount
at $GRAPHROOT/overlay/$LAYER/mapped/$ID.  The final overlay mount will
use these idmapped mounts instead of the original source directory.

The upperdir is not idmapped, so files are created with the same
IDs used by the user namespace.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
    @giuseppe
    giuseppe committed Apr 8, 2022
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