src/pkg/cosboot/ukiconfig_test.go

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cosboot

import (
	"compress/gzip"
	"io"
	"os"
	"path/filepath"
	"testing"

	"cos.googlesource.com/cos/tools.git/src/pkg/utils"
)

func TestEditUKICmdLine(t *testing.T) {
	tests := []struct {
		name    string
		input   string
		vmlinux string
		sedCmd  string
		want    string
	}{
		{
			name:    "BootA",
			input:   "testdata/kernelefi.img",
			vmlinux: "testdata/vmlinux.gz",
			sedCmd:  "s|.*|hello world|g",
			want:    "hello world",
		},
	}
	for _, test := range tests {
		test := test
		t.Run(test.name, func(t *testing.T) {
			tmpDir, err := os.MkdirTemp("", "cos-ukiconfigtest-")
			if err != nil {
				t.Fatal(err)
			}
			defer os.RemoveAll(tmpDir)

			vmlinuxDecompressed := filepath.Join(tmpDir, "vmlinux")
			f, err := os.Create(vmlinuxDecompressed)
			if err != nil {
				t.Fatal(err)
			}
			defer f.Close()

			r, err := os.Open(test.vmlinux)
			if err != nil {
				t.Fatal(err)
			}
			defer r.Close()
			gzRead, err := gzip.NewReader(r)
			if err != nil {
				t.Fatal(err)
			}
			defer gzRead.Close()
			if _, err := io.Copy(f, gzRead); err != nil {
				t.Fatal(err)
			}
			if err := f.Close(); err != nil {
				t.Fatal(err)
			}

			copiedInput := filepath.Join(tmpDir, "input")
			if err := utils.CopyFile(test.input, copiedInput); err != nil {
				t.Fatal(err)
			}

			if err := EditUKICmdLine(copiedInput, vmlinuxDecompressed, test.sedCmd); err != nil {
				t.Fatalf("EditUKICmdLine(%q, %q, %q) = %v; want nil", test.input, vmlinuxDecompressed, test.sedCmd, err)
			}
			got, err := NextUKICmdLine(copiedInput, vmlinuxDecompressed)
			if got != test.want {
				t.Errorf("NextUKICmdLine(%q, %q) = %q; want %q", test.input, vmlinuxDecompressed, got, test.want)
			}
		})
	}
}