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[wip] [31/n] sled-agent logic to clear and honor mupdate overrides #8572

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@sunshowers sunshowers commented Jul 10, 2025

TODO:

  • Code to honor mupdate overrides.
  • Call code to clear mupdate overrides.
  • The logic to clear them is a mess, I've tried to keep it as simple as possible but there are a ton of edge cases. Are we okay with this for r17? Yeah, in general, though we'll probably get rid of privileging the boot disk for this kind of metadata, and always use slot A for ledgered data in the future.
  • Write tests for everything.

Created using spr 1.3.6-beta.1
Created using spr 1.3.6-beta.1
Created using spr 1.3.6-beta.1
Comment on lines 430 to 433
// Reconcile the mupdate override field. This can be done independently
// of the other parts of reconciliation (and this doesn't have to block
// other parts of reconciliation), but the argument for this is somewhat
// non-trivial. Here's an outline:
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Worth having a look at this.

@sunshowers sunshowers changed the title [wip] [30/n] sled-agent logic to clear and honor mupdate overrides [wip] [31/n] sled-agent logic to clear and honor mupdate overrides Jul 15, 2025
sunshowers added a commit that referenced this pull request Jul 16, 2025
#8596)

While working on #8572, we realized that we need to put in a condition
saying that if any zones can't be switched over to Artifact, we must not
clear the mupdate override field. This effectively requires information
about eligibility to be available in two spots: while updating the
mupdate override, and while doing these noop conversions.

In order to do that more easily, this PR builds up a decision tree by
sled.
Created using spr 1.3.6-beta.1
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