volume: Fix file subpath mount over existing image file#52584
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May 9, 2026
When a volume subpath pointing to a single file was mounted onto a target path that already existed as a file in the container image, the container creation failed with "open /var/lib/docker/tmp/safe-mountXXX: not a directory". Skip the volume population step when the volume mount path is a file, since directory content copying is not applicable to single-file mounts. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
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When a volume subpath pointing to a single file was mounted onto a target path that already existed as a file in the container image, the container creation failed with "open /var/lib/docker/tmp/safe-mountXXX: not a directory".
Skip the volume population step when the volume mount path is a file, since directory content copying is not applicable to single-file mounts.
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