{"action":"closed","number":10106,"pull_request":{"url":"https://api.github.com/repos/hashicorp/terraform/pulls/10106","id":93619449,"html_url":"https://github.com/hashicorp/terraform/pull/10106","diff_url":"https://github.com/hashicorp/terraform/pull/10106.diff","patch_url":"https://github.com/hashicorp/terraform/pull/10106.patch","issue_url":"https://api.github.com/repos/hashicorp/terraform/issues/10106","number":10106,"state":"closed","locked":false,"title":"terraform: shadow errors with UUID() must be ignored","user":{"login":"mitchellh","id":1299,"avatar_url":"https://avatars.githubusercontent.com/u/1299?v=3","gravatar_id":"","url":"https://api.github.com/users/mitchellh","html_url":"https://github.com/mitchellh","followers_url":"https://api.github.com/users/mitchellh/followers","following_url":"https://api.github.com/users/mitchellh/following{/other_user}","gists_url":"https://api.github.com/users/mitchellh/gists{/gist_id}","starred_url":"https://api.github.com/users/mitchellh/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mitchellh/subscriptions","organizations_url":"https://api.github.com/users/mitchellh/orgs","repos_url":"https://api.github.com/users/mitchellh/repos","events_url":"https://api.github.com/users/mitchellh/events{/privacy}","received_events_url":"https://api.github.com/users/mitchellh/received_events","type":"User","site_admin":false},"body":"People with `uuid()` usage in their configurations would receive shadow\r\nerrors every time on plan because the UUID would change.\r\n\r\nThis is hacky fix but I also believe correct: if a shadow error contains\r\nuuid() then we ignore the shadow error completely. This feels wrong but\r\nI'll explain why it is likely right:\r\n\r\nThe \"right\" feeling solution is to create deterministic random output\r\nacross graph runs. This would require using math/rand and seeding it\r\nwith the same value each run. However, this alone probably won't work\r\ndue to Terraform's parallelism and potential to call uuid() in different\r\norders. In addition to this, you can't seed crypto/rand and its unlikely\r\nthat we'll NEVER use crypto/rand in the future even if we switched\r\nuuid() to use math/rand.\r\n\r\nTherefore, the solution is simple: if there is no shadow error, no\r\nproblem. If there is a shadow error and it contains uuid(), then 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