Test if overlayfs is affected by the DAC bug wrt. incremental upgrades changing UID/GID

Originally created by @intrigeri on #15689 (Redmine)

The bug was described on #13426 (closed).

If overlayfs is not affected, then as long as we don’t complete the rest of #15281 (closed) strictly before #8415 (closed), then we can reject the parent ticket (#15407 (closed)).

Attachments

• test-15689-overlayfs.sh

Parent Task: #8415 (closed)

Related issues

• Related to #13426 (closed)
• Related to #17256