fix: fixed wrong file read

Author: teneko

docs/resources/is_fully_known.md

@@ -8,13 +8,13 @@ description: |-
   Each module can use providermeta. Please keep in mind that these settings only count for resources of this module! (see https://www.terraform.io/internals/provider-meta https://www.terraform.io/internals/provider-meta):
   ```terraform
   // Terraform providermeta example
-      terraform {
-          // "value" is the provider name
-          providermeta "value" {
-              // {workdir} -> The only available placeholder currently (see below for more information)
-              guidseed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
-          }
+  terraform {
+      // "value" is the provider name
+      providermeta "value" {
+          // {workdir} -> The only available placeholder currently (see below for more information)
+          guidseed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
       }
+  }
   ```
   Optional
   guid_seed_addition (String) It serves as addition to each seed of any value_is_fully_known (resource) or value_is_known (resource) within the project if specified in provider, or within the same module if specified in provider-meta.
@@ -32,13 +32,13 @@ Allows you to have a access to `result` during plan phase that states whether `v
 Each module can use provider_meta. Please keep in mind that these settings only count for resources of this module! (see [https://www.terraform.io/internals/provider-meta](https://www.terraform.io/internals/provider-meta)):
 ```terraform
 // Terraform provider_meta example
-	terraform {
-		// "value" is the provider name
-		provider_meta "value" {
-			// {workdir} -> The only available placeholder currently (see below for more information)
-			guid_seed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
-		}
+terraform {
+	// "value" is the provider name
+	provider_meta "value" {
+		// {workdir} -> The only available placeholder currently (see below for more information)
+		guid_seed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
 	}
+}
 ```
 ### Optional
 - `guid_seed_addition` (String) It serves as addition to each seed of any `value_is_fully_known` (resource) or `value_is_known` (resource) within the project if specified in provider, or within the same module if specified in provider-meta.

docs/resources/is_known.md

@@ -8,13 +8,13 @@ description: |-
   Each module can use providermeta. Please keep in mind that these settings only count for resources of this module! (see https://www.terraform.io/internals/provider-meta https://www.terraform.io/internals/provider-meta):
   ```terraform
   // Terraform providermeta example
-      terraform {
-          // "value" is the provider name
-          providermeta "value" {
-              // {workdir} -> The only available placeholder currently (see below for more information)
-              guidseed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
-          }
+  terraform {
+      // "value" is the provider name
+      providermeta "value" {
+          // {workdir} -> The only available placeholder currently (see below for more information)
+          guidseed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
       }
+  }
   ```
   Optional
   guid_seed_addition (String) It serves as addition to each seed of any value_is_fully_known (resource) or value_is_known (resource) within the project if specified in provider, or within the same module if specified in provider-meta.
@@ -32,13 +32,13 @@ Allows you to have a access to `result` during plan phase that states whether `v
 Each module can use provider_meta. Please keep in mind that these settings only count for resources of this module! (see [https://www.terraform.io/internals/provider-meta](https://www.terraform.io/internals/provider-meta)):
 ```terraform
 // Terraform provider_meta example
-	terraform {
-		// "value" is the provider name
-		provider_meta "value" {
-			// {workdir} -> The only available placeholder currently (see below for more information)
-			guid_seed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
-		}
+terraform {
+	// "value" is the provider name
+	provider_meta "value" {
+		// {workdir} -> The only available placeholder currently (see below for more information)
+		guid_seed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
 	}
+}
 ```
 ### Optional
 - `guid_seed_addition` (String) It serves as addition to each seed of any `value_is_fully_known` (resource) or `value_is_known` (resource) within the project if specified in provider, or within the same module if specified in provider-meta.

isknown/common/provider_meta_schema.go

@@ -30,13 +30,13 @@ func getProviderMetaGuidSeedAdditionAttributeDescription() string {
 		"Each module can use provider_meta. Please keep in mind that these settings only count " +
 		"for resources of this module! (see [https://www.terraform.io/internals/provider-meta](https://www.terraform.io/internals/provider-meta)):\n" +
 		"```terraform\n" + `// Terraform provider_meta example
-	terraform {
-		// "value" is the provider name
-		provider_meta "value" {
-			// {workdir} -> The only available placeholder currently (see below for more information)
-			guid_seed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
-		}
-	}` + "\n```\n" +
+terraform {
+	// "value" is the provider name
+	provider_meta "value" {
+		// {workdir} -> The only available placeholder currently (see below for more information)
+		guid_seed_addition = "{workdir}#for-example" // Results into "/path/to/workdir#for-example"
+	}
+}` + "\n```\n" +
 		"### Optional\n" +
 		"- `guid_seed_addition` (String) " + goproviderconfig.GetGuidSeedAdditionAttributeDescription()
 }

isknown/provider/resource_plan.go

@@ -2,6 +2,7 @@ package provider
 
 import (
 	"context"
+	"errors"
 	"os"
 	"path/filepath"
 
@@ -118,7 +119,22 @@ func (s *UserProviderServer) PlanResourceChange(ctx context.Context, req *tfprot
 			return resp, nil
 		}
 	} else {
-		readBytes, err := os.ReadFile(deterministicTempFilePath)
+		deterministicFile, err := os.Open(deterministicTempFilePath)
+		var readBytes []byte
+
+		if errors.Is(err, os.ErrNotExist) {
+			resp.Diagnostics = append(resp.Diagnostics, &tfprotov6.Diagnostic{
+				Severity: tfprotov6.DiagnosticSeverityError,
+				Summary:  "File does not exist",
+				Detail: `The file does not exist. This can mean
+1. the file got deleted before apply-phase or
+2. this plan method got called the third time`,
+			})
+		} else if err == nil {
+			defer deterministicFile.Close() // ignore error intentionally
+			readBytes = make([]byte, 1)
+			deterministicFile.Read(readBytes)
+		}
 
 		if err != nil {
 			resp.Diagnostics = append(resp.Diagnostics, &tfprotov6.Diagnostic{