Fail fast on errors in powershell TTP steps (#518)

Summary:

Set ErrorActionPreference variable as first thing when executing the powershell TTPs

Resolves #517
Brings parity with bash fail-fast logic introduced in #406

Differential Revision: D65080213

pkg/blocks/executor.go

@@ -96,7 +96,7 @@ func (e *ScriptExecutor) Execute(ctx context.Context, execCtx TTPExecutionContex
 	body := expandedInlines[0]
 	if e.Name == ExecutorPowershellOnLinux || e.Name == ExecutorPowershell {
 		// Wrap the PowerShell command in a script block
-		body = fmt.Sprintf("&{%s}\n\n", body)
+		body = fmt.Sprintf("$ErrorActionPreference = 'Stop' ; &{%s}\n\n", body)
 	}
 
 	// expand variables in environment

pkg/blocks/executor_test.go

@@ -0,0 +1,75 @@
+/*
+Copyright © 2024-present, Meta Platforms, Inc. and affiliates
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+package blocks
+
+import (
+	"context"
+	"testing"
+)
+
+func TestBashExecutor(t *testing.T) {
+	emptyEnvironment := map[string]string{}
+	execCtx := TTPExecutionContext{Vars: &TTPExecutionVars{}}
+
+	testCases := []struct {
+		name           string
+		executorName   string
+		body           string
+		expectedResult string
+		expectedErrTxt string
+	}{
+		{
+			name:           "bash ok",
+			executorName:   "bash",
+			body:           "echo success",
+			expectedResult: "success\n",
+			expectedErrTxt: "",
+		},
+		{
+			name:           "bash fail fast",
+			executorName:   "bash",
+			body:           "false; echo success",
+			expectedResult: "",
+			expectedErrTxt: "exit status 1",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			executor := NewExecutor(tc.executorName, tc.body, "", []string{}, emptyEnvironment)
+			result, err := executor.Execute(context.Background(), execCtx)
+
+			if tc.expectedErrTxt != "" {
+				if err == nil {
+					t.Fatalf("expected error, got nil")
+				} else if err.Error() != tc.expectedErrTxt {
+					t.Fatalf("expected %v error, got %v", tc.expectedErrTxt, err.Error())
+				}
+			} else {
+				if err != nil {
+					t.Fatalf("expected no error, got %v", err)
+				}
+			}
+			if tc.expectedResult != "" && result.Stdout != tc.expectedResult {
+				t.Fatalf("expected output %#v, got %#v", tc.expectedResult, result.Stdout)
+			}
+		})
+	}
+}