Support OpenTofu

dist/index.js

@@ -79,6 +79,9 @@ async function run() {
 }
 // we need to parse the terraform plan into a json string
 async function jsonFromPlan(workingDir, planFileName) {
+    const exitCode = await exec.exec('which tofu', undefined, { silent: true, ignoreReturnCode: true });
+    const hasTofu = exitCode === 0;
+    const command = hasTofu ? 'tofu' : 'terraform';
     // run terraform show -json to parse the plan into a json string
     let output = '';
     const options = {
@@ -91,7 +94,7 @@ async function jsonFromPlan(workingDir, planFileName) {
         cwd: workingDir // execute the command from working directory 'dir'
     };
     core.debug(`execOptions: ${JSON.stringify(options)}`);
-    await exec.exec('terraform', ['show', '-json', planFileName], options);
+    await exec.exec(command, ['show', '-json', planFileName], options);
     // pull out any extra fluff from terraform wrapper from the hashicorp/setup-terraform action
     const json = output.match(/{.*}/);
     if (json === null) {

src/main.ts

@@ -53,6 +53,10 @@ async function run(): Promise<void> {
 
 // we need to parse the terraform plan into a json string
 async function jsonFromPlan(workingDir: string, planFileName: string): Promise<string> {
+  const exitCode = await exec.exec('which tofu', undefined, {silent: true, ignoreReturnCode: true})
+  const hasTofu = exitCode === 0
+  const command = hasTofu ? 'tofu' : 'terraform'
+
   // run terraform show -json to parse the plan into a json string
   let output = ''
   const options: ExecOptions = {
@@ -66,7 +70,7 @@ async function jsonFromPlan(workingDir: string, planFileName: string): Promise<s
   }
 
   core.debug(`execOptions: ${JSON.stringify(options)}`)
-  await exec.exec('terraform', ['show', '-json', planFileName], options)
+  await exec.exec(command, ['show', '-json', planFileName], options)
 
   // pull out any extra fluff from terraform wrapper from the hashicorp/setup-terraform action
   const json = output.match(/{.*}/)