Serialize AttrSensitivePaths in a consistent order
#36465
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The local format function for diagnostics didn't match the global formatting for the tfdiags package.
Create a single place to generate some common formats, mostly the format of a cty.Path. These were used in the tfdiags package, but need to be split out to prevent import cycles if we want to use them in any core package.
We can make the comparison a little more efficient by removing the reflection to create the Sprintf string.
liamcervante
approved these changes
Feb 11, 2025
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Sensitive paths in a resource instance value were not serialized in a consistent order, which could cause comparison of the state to erroneously indicate a change. While the UI would not report any changes to the user because the states were functionally the same, the machine readable outputs, like the plan `applyable' field and the detailed exitcode would indicate that the plan was not empty.
The canonical user-readable version of a cty.Path is was created by the tfdiags package, but in order to reuse this everywhere we need, the formatting function needs to be split out to it's own package. This PR creates the
lang/formatpackage, delegates thetfgdiagsformat functions to the new package, then replaces any otherfmt.Sprintfformatting ofcty.PathI could find with the new more efficient formatter.Once we have a single format for
cty.Path, use that to sort theAttrSensitivePathsused in state so that the order is deterministic.Fixes #36403