Preserve extra overlayfs mount options when loading many-layered images #1156
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kousu
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Feb 28, 2022
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| if len(optsList) > 0 { | ||
| opts = fmt.Sprintf("%s,%s", opts, strings.Join(optsList, ",")) | ||
| } |
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This part is the fix. The rest of the patch is just supporting changes for this line.
When overlayfs loads a container image that has many layers, each becomes an extra argument to the 'lowerdir' list, and if it has many many many of them it will try to squeeze more in by rewriting them as relative paths. Unfortunately, this case was forgetting 'userxattr' and 'volatile' and any other user-supplied mount options. It meant that in rootless mode (which needs userxattr to behave properly) you'd get an EXDEV error anytime you tried to rename() a directory. Fixes containers/podman#13123 Signed-off-by: Nick Guenther <[email protected]>
flouthoc
approved these changes
Feb 28, 2022
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or a dummy PR against |
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@giuseppe PTAL |
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Thanks @kousu |
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When overlayfs loads a container image that has many layers, each becomes an extra argument to the 'lowerdir' list, and if it has many many many of them it will try to squeeze more in by rewriting them as relative paths.
Unfortunately, this case was forgetting 'userxattr' and 'volatile' and any other user-supplied mount options, which meant that in rootless mode (which needs userxattr to behave properly) you'd get an EXDEV error anytime you tried to rename() a directory.
This swaps a couple steps around to make it easier to make both cases the same.
This should fix containers/podman#13123, but I haven't actually tested it yet because I haven't figured out how. But I traced enough out to spot the bug and wanted to get some code up before I forgot it.
Cheers!