WIP: fcos translate.go: add warn on small or constrained root partition #378
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config/fcos/v1_5_exp/translate.go
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| r.AddOnWarn(path.New("json", "storage", "disks", i, "partitions", p, "sizeMiB", *partition.SizeMiB), common.ErrRootTooSmall) | ||
| } else { | ||
| for _, op := range disk.Partitions { | ||
| if op.Number > partition.Number { |
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We're currently performing this check for every partition after the root partition, not just the one immediately after it.
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OH can we assume that they are always in order?
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What we don't want is to warn repeatedly for every additional partition. But you're right, we can't assume they're in order, either by starting offset or by partition number. And actually, we can't make assumptions about op.Number either, since it might be 0.
So we'll need an heuristic for figuring out the earliest partition start. If the startMiB is always specified, this is easy. Otherwise, the partition order is determined by a combination of sgdisk's heuristics (see the man page for the -n option) and the additional heuristics applied by partitions.go. And unfortunately, they have some information we don't, which is the overall size of the disk, and thus the size of the largest available block.
So we'll need to figure this out. If there are cases where we're not sure, it's better to not warn.
config/fcos/v1_5_exp/translate.go
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| } else { | ||
| for _, op := range disk.Partitions { | ||
| if op.Number > partition.Number { | ||
| if op.StartMiB == nil { |
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This doesn't match the logic described in #211 (comment).
config/common/errors.go
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| ErrNoFilesDir = errors.New("local file paths are relative to a files directory that must be specified with -d/--files-dir") | ||
| ErrTreeNotDirectory = errors.New("root of tree must be a directory") | ||
| ErrRootTooSmall = errors.New("root should have 8GiB of space available") | ||
| ErrRootNotLastPartition = errors.New("root should be last partition number to allow for growth") |
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The message is misleading, since we allow and encourage adding partitions after the root.
config/common/errors.go
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| ErrNodeExists = errors.New("matching filesystem node has existing contents or different type") | ||
| ErrNoFilesDir = errors.New("local file paths are relative to a files directory that must be specified with -d/--files-dir") | ||
| ErrTreeNotDirectory = errors.New("root of tree must be a directory") | ||
| ErrRootTooSmall = errors.New("root should have 8GiB of space available") |
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nit: available could be read to imply free space in the filesystem.
| if partition.Label != nil { | ||
| for p, partition := range disk.Partitions { | ||
| if partition.Label != nil { | ||
| if *partition.Label == "root" { |
config/fcos/v1_5_exp/translate.go
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| } | ||
| } | ||
| } | ||
| // Don't warn if wipeTable is set, matching later spec versions |
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Looks like we lost the original comment here. "matching later spec versions"?
| { | ||
| Kind: report.Warn, | ||
| Message: common.ErrRootTooSmall.Error(), | ||
| Context: path.New("json", "storage", "disks", 0, "partitions", 0, "sizeMiB", 500), |
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This is specifying the 501st element of the sizeMiB array.
| Partitions: []types.Partition{ | ||
| { | ||
| Label: util.StrToPtr("root"), | ||
| SizeMiB: util.IntToPtr(10000), |
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This size is sufficient, so the test should pass.
| }, | ||
| }, | ||
| }, | ||
| }, |
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Let's also add tests where the root partition doesn't explicitly specify a size but is constrained by another partition which does/doesn't leave enough room.
| { | ||
| Kind: report.Warn, | ||
| Message: common.ErrRootNotLastPartition.Error(), | ||
| Context: path.New("json", "storage", "disks", 0, "partitions", 0, "number", 4), |
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Likewise, this is the 5th element of the number array.
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Fixes coreos#211, the root partition needs a certain amount of space, with recent changes butane has the opportunity to warn when those expectations are not met. Add a warn when the root is too small, and additionally add warn when the root is small and cannot expand.
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#211
First naive approach, plan on refactoring before coping work to prior versions of fcos