KurlesHS/restic
1
0
Fork 0
forked from TrueCloudLab/restic
Code Pull requests Activity

Add test cases and handle volume GUID paths

Browse source 
Gracefully handle errors while checking for EA and add debug logs.
This commit is contained in:
aneesh-n 2024-08-11 19:25:58 -06:00 committed by Michael Eischer
parent 51fad2eecb
commit 7642e05eed
5 changed files with 306 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
changelog/unreleased/pull-4980
View file

@ -8,5 +8,6 @@ Restic now completely skips the attempt to fetch extended attributes
for such volumes where it is not supported.
https://github.com/restic/restic/pull/4980
https://github.com/restic/restic/pull/4998
https://github.com/restic/restic/issues/4955
https://github.com/restic/restic/issues/4950

8
changelog/unreleased/pull-4998
View file

@ -1,8 +0,0 @@
Bugfix: Fix extended attributes handling for VSS snapshots
Restic was failing to backup extended attributes for VSS snapshots
after the fix for https://github.com/restic/restic/pull/4980.
Restic now correctly handles extended attributes for VSS snapshots.
https://github.com/restic/restic/pull/4998
https://github.com/restic/restic/pull/4980

76
internal/fs/ea_windows_test.go
View file

@ -10,6 +10,7 @@ import (
"os"
"path/filepath"
"reflect"
"strings"
"syscall"
"testing"
"unsafe"
@ -245,3 +246,78 @@ func testSetGetEA(t *testing.T, path string, handle windows.Handle, testEAs []Ex
t.Fatalf("EAs read from path %s don't match", path)
}
}
func TestPathSupportsExtendedAttributes(t *testing.T) {
testCases := []struct {
name string
path string
expected bool
}{
{
name: "System drive",
path: os.Getenv("SystemDrive") + `\`,
expected: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
supported, err := PathSupportsExtendedAttributes(tc.path)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
if supported != tc.expected {
t.Errorf("Expected %v, got %v for path %s", tc.expected, supported, tc.path)
}
})
}
// Test with an invalid path
_, err := PathSupportsExtendedAttributes("Z:\\NonExistentPath-UAS664da5s4dyu56das45f5as")
if err == nil {
t.Error("Expected an error for non-existent path, but got nil")
}
}
func TestGetVolumePathName(t *testing.T) {
tempDirVolume := filepath.VolumeName(os.TempDir())
testCases := []struct {
name string
path string
expectedPrefix string
}{
{
name: "Root directory",
path: os.Getenv("SystemDrive") + `\`,
expectedPrefix: os.Getenv("SystemDrive"),
},
{
name: "Nested directory",
path: os.Getenv("SystemDrive") + `\Windows\System32`,
expectedPrefix: os.Getenv("SystemDrive"),
},
{
name: "Temp directory",
path: os.TempDir() + `\`,
expectedPrefix: tempDirVolume,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
volumeName, err := GetVolumePathName(tc.path)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
if !strings.HasPrefix(volumeName, tc.expectedPrefix) {
t.Errorf("Expected volume name to start with %s, but got %s", tc.expectedPrefix, volumeName)
}
})
}
// Test with an invalid path
_, err := GetVolumePathName("Z:\\NonExistentPath")
if err == nil {
t.Error("Expected an error for non-existent path, but got nil")
}
}

49
internal/restic/node_windows.go
View file

@ -42,6 +42,7 @@ const (
extendedPathPrefix = `\\?\`
uncPathPrefix = `\\?\UNC\`
globalRootPrefix = `\\?\GLOBALROOT\`
volumeGUIDPrefix = `\\?\Volume{`
)
// mknod is not supported on Windows.
@ -422,15 +423,21 @@ func checkAndStoreEASupport(path string) (isEASupportedVolume bool, err error) {
}
// If not found, check if EA is supported with manually prepared volume name
isEASupportedVolume, err = fs.PathSupportsExtendedAttributes(volumeName + `\`)
// If the prepared volume name is not valid, we will next fetch the actual volume name.
// If the prepared volume name is not valid, we will fetch the actual volume name next.
if err != nil && !errors.Is(err, windows.DNS_ERROR_INVALID_NAME) {
return false, err
debug.Log("Error checking if extended attributes are supported for prepared volume name %s: %v", volumeName, err)
// There can be multiple errors like path does not exist, bad network path, etc.
// We just gracefully disallow extended attributes for cases.
return false, nil
}
}
// If an entry is not found, get the actual volume name using the GetVolumePathName function
volumeNameActual, err := fs.GetVolumePathName(path)
if err != nil {
return false, err
debug.Log("Error getting actual volume name %s for path %s: %v", volumeName, path, err)
// There can be multiple errors like path does not exist, bad network path, etc.
// We just gracefully disallow extended attributes for cases.
return false, nil
}
if volumeNameActual != volumeName {
// If the actual volume name is different, check cache for the actual volume name
@ -441,11 +448,19 @@ func checkAndStoreEASupport(path string) (isEASupportedVolume bool, err error) {
}
// If the actual volume name is different and is not in the map, again check if the new volume supports extended attributes with the actual volume name
isEASupportedVolume, err = fs.PathSupportsExtendedAttributes(volumeNameActual + `\`)
// Debug log for cases where the prepared volume name is not valid
if err != nil {
return false, err
debug.Log("Error checking if extended attributes are supported for actual volume name %s: %v", volumeNameActual, err)
// There can be multiple errors like path does not exist, bad network path, etc.
// We just gracefully disallow extended attributes for cases.
return false, nil
} else {
debug.Log("Checking extended attributes. Prepared volume name: %s, actual volume name: %s, isEASupportedVolume: %v, err: %v", volumeName, volumeNameActual, isEASupportedVolume, err)
}
}
eaSupportedVolumesMap.Store(volumeNameActual, isEASupportedVolume)
if volumeNameActual != "" {
eaSupportedVolumesMap.Store(volumeNameActual, isEASupportedVolume)
}
return isEASupportedVolume, err
}
@ -460,17 +475,19 @@ func prepareVolumeName(path string) (volumeName string, err error) {
volumeName = filepath.VolumeName(path)
}
} else {
if strings.HasPrefix(path, uncPathPrefix) {
// Convert \\?\UNC\ extended path to standard path to get the volume name correctly
path = `\\` + path[len(uncPathPrefix):]
} else if strings.HasPrefix(path, extendedPathPrefix) {
//Extended length path prefix needs to be trimmed to get the volume name correctly
path = path[len(extendedPathPrefix):]
} else {
// Use the absolute path
path, err = filepath.Abs(path)
if err != nil {
return "", fmt.Errorf("failed to get absolute path: %w", err)
if !strings.HasPrefix(path, volumeGUIDPrefix) { // Handle volume GUID path
if strings.HasPrefix(path, uncPathPrefix) {
// Convert \\?\UNC\ extended path to standard path to get the volume name correctly
path = `\\` + path[len(uncPathPrefix):]
} else if strings.HasPrefix(path, extendedPathPrefix) {
//Extended length path prefix needs to be trimmed to get the volume name correctly
path = path[len(extendedPathPrefix):]
} else {
// Use the absolute path
path, err = filepath.Abs(path)
if err != nil {
return "", fmt.Errorf("failed to get absolute path: %w", err)
}
}
}
volumeName = filepath.VolumeName(path)

196
internal/restic/node_windows_test.go
View file

@ -12,6 +12,7 @@ import (
"strings"
"syscall"
"testing"
"time"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/fs"
@ -329,3 +330,198 @@ func TestRestoreExtendedAttributes(t *testing.T) {
}
}
}
func TestPrepareVolumeName(t *testing.T) {
currentVolume := filepath.VolumeName(func() string {
// Get the current working directory
pwd, err := os.Getwd()
if err != nil {
t.Fatalf("Failed to get current working directory: %v", err)
}
return pwd
}())
// Create a temporary directory for the test
tempDir, err := os.MkdirTemp("", "restic_test_"+time.Now().Format("20060102150405"))
if err != nil {
t.Fatalf("Failed to create temp directory: %v", err)
}
defer os.RemoveAll(tempDir)
// Create a long file name
longFileName := `\Very\Long\Path\That\Exceeds\260\Characters\` + strings.Repeat(`\VeryLongFolderName`, 20) + `\\LongFile.txt`
longFilePath := filepath.Join(tempDir, longFileName)
tempDirVolume := filepath.VolumeName(tempDir)
// Create the file
content := []byte("This is a test file with a very long name.")
err = os.MkdirAll(filepath.Dir(longFilePath), 0755)
test.OK(t, err)
if err != nil {
t.Fatalf("Failed to create long folder: %v", err)
}
err = os.WriteFile(longFilePath, content, 0644)
test.OK(t, err)
if err != nil {
t.Fatalf("Failed to create long file: %v", err)
}
osVolumeGUIDPath := getOSVolumeGUIDPath(t)
osVolumeGUIDVolume := filepath.VolumeName(osVolumeGUIDPath)
testCases := []struct {
name string
path string
expectedVolume string
expectError bool
expectedEASupported bool
isRealPath bool
}{
{
name: "Network drive path",
path: `Z:\Shared\Documents`,
expectedVolume: `Z:`,
expectError: false,
expectedEASupported: false,
},
{
name: "Subst drive path",
path: `X:\Virtual\Folder`,
expectedVolume: `X:`,
expectError: false,
expectedEASupported: false,
},
{
name: "Windows reserved path",
path: `\\.\` + os.Getenv("SystemDrive") + `\System32\drivers\etc\hosts`,
expectedVolume: `\\.\` + os.Getenv("SystemDrive"),
expectError: false,
expectedEASupported: true,
isRealPath: true,
},
{
name: "Long UNC path",
path: `\\?\UNC\LongServerName\VeryLongShareName\DeepPath\File.txt`,
expectedVolume: `\\LongServerName\VeryLongShareName`,
expectError: false,
expectedEASupported: false,
},
{
name: "Volume GUID path",
path: osVolumeGUIDPath,
expectedVolume: osVolumeGUIDVolume,
expectError: false,
expectedEASupported: true,
isRealPath: true,
},
{
name: "Volume GUID path with subfolder",
path: osVolumeGUIDPath + `\Windows`,
expectedVolume: osVolumeGUIDVolume,
expectError: false,
expectedEASupported: true,
isRealPath: true,
},
{
name: "Standard path",
path: os.Getenv("SystemDrive") + `\Users\`,
expectedVolume: os.Getenv("SystemDrive"),
expectError: false,
expectedEASupported: true,
isRealPath: true,
},
{
name: "Extended length path",
path: longFilePath,
expectedVolume: tempDirVolume,
expectError: false,
expectedEASupported: true,
isRealPath: true,
},
{
name: "UNC path",
path: `\\server\share\folder`,
expectedVolume: `\\server\share`,
expectError: false,
expectedEASupported: false,
},
{
name: "Extended UNC path",
path: `\\?\UNC\server\share\folder`,
expectedVolume: `\\server\share`,
expectError: false,
expectedEASupported: false,
},
{
name: "Volume Shadow Copy path",
path: `\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\Users\test`,
expectedVolume: `\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1`,
expectError: false,
expectedEASupported: false,
},
{
name: "Relative path",
path: `folder\subfolder`,
expectedVolume: currentVolume, // Get current volume
expectError: false,
expectedEASupported: true,
},
{
name: "Empty path",
path: ``,
expectedVolume: currentVolume,
expectError: false,
expectedEASupported: true,
isRealPath: false,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
isEASupported, err := checkAndStoreEASupport(tc.path)
test.OK(t, err)
test.Equals(t, tc.expectedEASupported, isEASupported)
volume, err := prepareVolumeName(tc.path)
if tc.expectError {
test.Assert(t, err != nil, "Expected an error, but got none")
} else {
test.OK(t, err)
}
test.Equals(t, tc.expectedVolume, volume)
if tc.isRealPath {
isEASupportedVolume, err := fs.PathSupportsExtendedAttributes(volume + `\`)
// If the prepared volume name is not valid, we will next fetch the actual volume name.
test.OK(t, err)
test.Equals(t, tc.expectedEASupported, isEASupportedVolume)
actualVolume, err := fs.GetVolumePathName(tc.path)
test.OK(t, err)
test.Equals(t, tc.expectedVolume, actualVolume)
}
})
}
}
func getOSVolumeGUIDPath(t *testing.T) string {
// Get the path of the OS drive (usually C:\)
osDrive := os.Getenv("SystemDrive") + "\\"
// Convert to a volume GUID path
volumeName, err := windows.UTF16PtrFromString(osDrive)
test.OK(t, err)
if err != nil {
return ""
}
var volumeGUID [windows.MAX_PATH]uint16
err = windows.GetVolumeNameForVolumeMountPoint(volumeName, &volumeGUID[0], windows.MAX_PATH)
test.OK(t, err)
if err != nil {
return ""
}
return windows.UTF16ToString(volumeGUID[:])
}