oci: partially restore comment on read-only mounts for uid/gid uses#8397
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dmcgowan merged 1 commit intocontainerd:mainfrom Apr 17, 2023
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Commit cab0562 removed the tryReadonlyMounts utility, in favor of mounts.ReadOnlyMounts() that was added in commit daa3a76. That change made part of the comment redundant, because mounts.ReadOnlyMounts handles both overlayfs read-only mounts (by skipping the workdir mounts), and sets the "ro" option for other mount-types, but the reason why we're using a read-only mount is still relevant, so restoring that part of the comment. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
thaJeztah
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Apr 15, 2023
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| // Use a read-only mount when trying to get user/group information | ||
| // from the container's rootfs. Since the option does read operation | ||
| // only, we append ReadOnly mount option to prevent the Linux kernel | ||
| // from syncing whole filesystem in umount syscall. |
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@fuweid let me know if this is enough to restore, or if the second half (the TODO) of the original comment is still relevant in some cases;
// TODO(fuweid):
//
// Currently, it only works for overlayfs. I think we can apply it to other
// kinds of filesystem. Maybe we can return `ro` option by `snapshotter.Mount`
// API, when the caller passes that experimental annotation
// `containerd.io/snapshot/readonly.mount` something like that.
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Thanks! Wanted to be sure if there wasn't some case I overlooked
fuweid
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Apr 15, 2023
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| // Use a read-only mount when trying to get user/group information | ||
| // from the container's rootfs. Since the option does read operation | ||
| // only, we append ReadOnly mount option to prevent the Linux kernel | ||
| // from syncing whole filesystem in umount syscall. |
This was referenced Apr 17, 2023
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dmcgowan
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Apr 17, 2023
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ReadonlyMountsto make overlay mounts readonly #8259Commit cab0562 removed the tryReadonlyMounts utility, in favor of mounts.ReadOnlyMounts() that was added in commit daa3a76.
That change made part of the comment redundant, because mounts.ReadOnlyMounts handles both overlayfs read-only mounts (by skipping the workdir mounts), and sets the "ro" option for other mount-types, but the reason why we're using a read-only mount is still relevant, so restoring that part of the comment.