fix(cmd/gf): fix gf env and gf build --dumpEnv command error (#4635)

## Summary
- Fix `gf env` and `gf build --dumpEnv` command failing when `go env`
outputs warning messages
- When `go env` outputs warnings (e.g., invalid characters in
environment variables), it returns non-zero exit code but still provides
valid output
- The original code would fail in this case

## Changes
- Only fail when `go env` returns empty output, allow non-zero exit code
with valid output
- Skip lines that don't match `key=value` format instead of failing with
Fatal error
- Add debug log for skipped lines to help troubleshooting
- Add unit tests for env command

## Related Issue
Fixes #4469

## Test plan
- [x] `gf env` command works correctly even when `go env` outputs
warnings
- [x] `gf build --dumpEnv` works correctly
- [x] Added unit tests pass

.gitignore

@@ -25,3 +25,4 @@ node_modules
 output
 .example/
 .golangci.bck.yml
+*.exe

cmd/gf/internal/cmd/cmd_env.go

@@ -37,11 +37,13 @@ type cEnvInput struct {
 type cEnvOutput struct{}
 
 func (c cEnv) Index(ctx context.Context, in cEnvInput) (out *cEnvOutput, err error) {
-	result, err := gproc.ShellExec(ctx, "go env")
-	if err != nil {
-		mlog.Fatal(err)
-	}
+	result, execErr := gproc.ShellExec(ctx, "go env")
+	// Note: go env may return non-zero exit code when there are warnings (e.g., invalid characters in env vars),
+	// but it still outputs valid environment variables. So we only fail if result is empty.
 	if result == "" {
+		if execErr != nil {
+			mlog.Fatal(execErr)
+		}
 		mlog.Fatal(`retrieving Golang environment variables failed, did you install Golang?`)
 	}
 	var (
@@ -59,7 +61,9 @@ func (c cEnv) Index(ctx context.Context, in cEnvInput) (out *cEnvOutput, err err
 		}
 		match, _ := gregex.MatchString(`(.+?)=(.*)`, line)
 		if len(match) < 3 {
-			mlog.Fatalf(`invalid Golang environment variable: "%s"`, line)
+			// Skip lines that don't match key=value format (e.g., warning messages from go env)
+			mlog.Debugf(`invalid Golang environment variable: "%s"`, line)
+			continue
 		}
 		array = append(array, []string{gstr.Trim(match[1]), gstr.Trim(match[2])})
 	}

cmd/gf/internal/cmd/cmd_z_unit_env_test.go

@@ -0,0 +1,84 @@
+// Copyright GoFrame gf Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package cmd
+
+import (
+	"testing"
+
+	"github.com/gogf/gf/v2/test/gtest"
+	"github.com/gogf/gf/v2/text/gregex"
+	"github.com/gogf/gf/v2/text/gstr"
+)
+
+func Test_Env_Index(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		// Test that env command runs without error
+		_, err := Env.Index(ctx, cEnvInput{})
+		t.AssertNil(err)
+	})
+}
+
+func Test_Env_ParseGoEnvOutput(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		// Test parsing normal go env output
+		lines := []string{
+			"set GOPATH=C:\\Users\\test\\go",
+			"set GOROOT=C:\\Go",
+			"set GOOS=windows",
+			"GOARCH=amd64", // Unix format without "set " prefix
+			"CGO_ENABLED=0",
+		}
+
+		for _, line := range lines {
+			line = gstr.Trim(line)
+			if gstr.Pos(line, "set ") == 0 {
+				line = line[4:]
+			}
+			match, _ := gregex.MatchString(`(.+?)=(.*)`, line)
+			t.Assert(len(match) >= 3, true)
+		}
+	})
+}
+
+func Test_Env_ParseGoEnvOutput_WithWarnings(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		// Test parsing go env output that contains warning messages
+		// These lines should be skipped without causing errors
+		lines := []string{
+			"go: stripping unprintable or unescapable characters from %\"GOPROXY\"%",
+			"go: warning: some warning message",
+			"# this is a comment",
+			"",
+			"set GOPATH=C:\\Users\\test\\go",
+			"set GOOS=windows",
+		}
+
+		array := make([][]string, 0)
+		for _, line := range lines {
+			line = gstr.Trim(line)
+			if line == "" {
+				continue
+			}
+			if gstr.Pos(line, "set ") == 0 {
+				line = line[4:]
+			}
+			match, _ := gregex.MatchString(`(.+?)=(.*)`, line)
+			if len(match) < 3 {
+				// Skip lines that don't match key=value format (e.g., warning messages)
+				continue
+			}
+			array = append(array, []string{gstr.Trim(match[1]), gstr.Trim(match[2])})
+		}
+
+		// Should have parsed 2 valid environment variables
+		t.Assert(len(array), 2)
+		t.Assert(array[0][0], "GOPATH")
+		t.Assert(array[0][1], "C:\\Users\\test\\go")
+		t.Assert(array[1][0], "GOOS")
+		t.Assert(array[1][1], "windows")
+	})
+}