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mount: copy options before replacing lowerdir - #14551
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samuelkarp wants to merge 1 commit into
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Mounting an overlay with ID mapping replaces its lowerdir option with temporary ID-mapped directories. The replacement was made in place, so it also changed the Mount the caller passed in. After the call, that Mount's lowerdir option listed temporary directories that were already unmounted. Assisted-by: Claude Code:claude-opus-5-5 Signed-off-by: Samuel Karp <me@samuelkarp.com>
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🟢 Approval recommended
No active review issues were identified for the change intended to preserve caller-owned mount options during ID-mapped overlay mounting.
No open issues 🎉
What changed in this PR
Prevents ID-mapped overlay mounting from modifying the caller’s mount options and leaving them pointing to temporary directories that have already been unmounted.
Changes:
- Clones the options slice before replacing and appending the
lowerdiroption. - Adds a regression test verifying the replacement options and preservation of the original input.
| File | Description |
|---|---|
core/mount/mount_linux.go |
Extracts lowerdir replacement into a helper that copies options before modifying them. |
core/mount/mount_linux_test.go |
Tests lowerdir replacement and verifies that caller-owned options remain unchanged. |
Review effort: Balanced
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Mounting an overlay with ID mapping replaces its lowerdir option with temporary ID-mapped directories. The replacement was made in place, so it also changed the Mount the caller passed in. After the call, that Mount's lowerdir option listed temporary directories that were already unmounted.
Assisted-by: Claude Code:claude-opus-5-5