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set_test_env.go
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set_test_env.go
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// Copyright 2020 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 partutiltest
import (
"fmt"
"io"
"os"
"os/exec"
"testing"
)
// TestNames is used for testing environment setup and teardown.
type TestNames struct {
CopyFile string
DiskName string
}
// SetupFakeDisk copys a file to simulate the disk and work on the copy for tests.
func SetupFakeDisk(copyName, srcPrefix string, t *testing.T, testNames *TestNames) {
src, err := os.Open(fmt.Sprintf("./%stestdata/ori_disk", srcPrefix))
if err != nil {
t.Fatalf("setting up fake disk, cannot open test disk file: ori_disk, "+
"input: copyName=%q, srcPrefix=%q, "+
"error msg: (%v)", copyName, srcPrefix, err)
}
defer src.Close()
copyFile := fmt.Sprintf("./%stestdata/%s", srcPrefix, copyName)
testNames.CopyFile = copyFile
dest, err := os.Create(copyFile)
if err != nil {
t.Fatalf("setting up fake disk, cannot create tmp disk file, "+
"input: copyName=%q, srcPrefix=%q, "+
"error msg: (%v)", copyName, srcPrefix, err)
}
if _, err := io.Copy(dest, src); err != nil {
t.Fatalf("setting up fake disk, cannot copy tmp disk file, "+
"input: copyName=%q, srcPrefix=%q, "+
"error msg: (%v)", copyName, srcPrefix, err)
}
dest.Close()
out, err := exec.Command("sudo", "losetup", "-fP", "--show", copyFile).Output()
if err != nil {
t.Fatalf("setting up fake disk, cannot losetup fake disk file, "+
"input: copyName=%q, srcPrefix=%q, "+
"error msg: (%v)", copyName, srcPrefix, err)
}
diskName := string(out)
testNames.DiskName = diskName[:len(diskName)-1]
}
// TearDown delete the loop device and the copied file for testing environment.
func TearDown(testNames *TestNames) {
if testNames.DiskName != "" {
exec.Command("sudo", "losetup", "-d", testNames.DiskName).Run()
}
if testNames.CopyFile != "" {
os.Remove(testNames.CopyFile)
}
}