support install without config

src/main.ts

@@ -8,35 +8,47 @@ import * as installer from './installer'
  */
 export async function run(): Promise<void> {
   try {
-    // download
-    const version = core.getInput('ossutil-version')
-    await installer.installOssutil(version)
-    core.info('ossutil is successfully installed')
-
-    // config
-    const inputOptions: core.InputOptions = { required: true }
-    const endpoint = core.getInput('endpoint', inputOptions)
-    const accessKeyId = core.getInput('access-key-id', inputOptions)
-    const accessKeySecret = core.getInput('access-key-secret', inputOptions)
-    const stsToken = core.getInput('sts-token')
-    const args = [
-      'config',
-      '--endpoint',
-      endpoint,
-      '--access-key-id',
-      accessKeyId,
-      '--access-key-secret',
-      accessKeySecret
-    ]
-    if (stsToken) {
-      args.push('--sts-token', stsToken)
-    }
-    const exitCode = await exec.exec('ossutil', args)
-    if (exitCode === 0) {
-      core.info('ossutil config is done')
-    }
+    install()
+    config()
   } catch (error) {
     // Fail the workflow run if an error occurs
     if (error instanceof Error) core.setFailed(error.message)
   }
 }
+
+async function install(): Promise<void> {
+  const version = core.getInput('ossutil-version', { required: true })
+  await installer.installOssutil(version)
+  core.info('ossutil is successfully installed')
+}
+
+async function config(): Promise<void> {
+  const endpoint = core.getInput('endpoint')
+  if (endpoint.length === 0) {
+    core.info('ossutil config is skipped')
+    return
+  }
+
+  const accessKeyId = core.getInput('access-key-id', { required: true })
+  const accessKeySecret = core.getInput('access-key-secret', { required: true })
+  const args = [
+    'config',
+    '--endpoint',
+    endpoint,
+    '--access-key-id',
+    accessKeyId,
+    '--access-key-secret',
+    accessKeySecret
+  ]
+  const stsToken = core.getInput('sts-token')
+  if (stsToken) {
+    args.push('--sts-token', stsToken)
+  }
+
+  const exitCode = await exec.exec('ossutil', args)
+  if (exitCode === 0) {
+    core.info('ossutil config is done')
+  } else {
+    core.error(`ossutil config is failed with exit code: ${exitCode}`)
+  }
+}