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Remove os from devmapper

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This commit is contained in:
Guillaume J. Charmes 2013-11-20 13:05:17 -08:00
parent 5690139785
commit a39bd65662
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GPG key ID: B33E4642CB6E3FF3
6 changed files with 52 additions and 44 deletions
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30
graphdriver/devmapper/deviceset.go
View file

@ -6,7 +6,6 @@ import (
"github.com/dotcloud/docker/utils" "github.com/dotcloud/docker/utils"
"io" "io"
"io/ioutil" "io/ioutil"
"os"
"os/exec" "os/exec"
"path" "path"
"path/filepath" "path/filepath"
@ -104,7 +103,7 @@ func (devices *DeviceSet) hasImage(name string) bool {
dirname := devices.loopbackDir() dirname := devices.loopbackDir()
filename := path.Join(dirname, name) filename := path.Join(dirname, name)
_, err := os.Stat(filename) _, err := osStat(filename)
return err == nil return err == nil
} }
@ -116,16 +115,16 @@ func (devices *DeviceSet) ensureImage(name string, size int64) (string, error) {
dirname := devices.loopbackDir() dirname := devices.loopbackDir()
filename := path.Join(dirname, name) filename := path.Join(dirname, name)
if err := os.MkdirAll(dirname, 0700); err != nil && !os.IsExist(err) { if err := osMkdirAll(dirname, 0700); err != nil && !osIsExist(err) {
return "", err return "", err
} }
if _, err := os.Stat(filename); err != nil { if _, err := osStat(filename); err != nil {
if !os.IsNotExist(err) { if !osIsNotExist(err) {
return "", err return "", err
} }
utils.Debugf("Creating loopback file %s for device-manage use", filename) utils.Debugf("Creating loopback file %s for device-manage use", filename)
file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0600) file, err := osOpenFile(filename, osORdWr|osOCreate, 0600)
if err != nil { if err != nil {
return "", err return "", err
} }
@ -173,7 +172,7 @@ func (devices *DeviceSet) saveMetadata() error {
if err := tmpFile.Close(); err != nil { if err := tmpFile.Close(); err != nil {
return fmt.Errorf("Error closing metadata file %s: %s", tmpFile.Name(), err) return fmt.Errorf("Error closing metadata file %s: %s", tmpFile.Name(), err)
} }
if err := os.Rename(tmpFile.Name(), devices.jsonFile()); err != nil { if err := osRename(tmpFile.Name(), devices.jsonFile()); err != nil {
return fmt.Errorf("Error committing metadata file", err) return fmt.Errorf("Error committing metadata file", err)
} }
@ -251,7 +250,7 @@ func (devices *DeviceSet) loadMetaData() error {
devices.NewTransactionId = devices.TransactionId devices.NewTransactionId = devices.TransactionId
jsonData, err := ioutil.ReadFile(devices.jsonFile()) jsonData, err := ioutil.ReadFile(devices.jsonFile())
if err != nil && !os.IsNotExist(err) { if err != nil && !osIsNotExist(err) {
utils.Debugf("\n--->Err: %s\n", err) utils.Debugf("\n--->Err: %s\n", err)
return err return err
} }
@ -336,10 +335,9 @@ func (devices *DeviceSet) setupBaseImage() error {
} }
func setCloseOnExec(name string) { func setCloseOnExec(name string) {
fileInfos, _ := ioutil.ReadDir("/proc/self/fd") if fileInfos, _ := ioutil.ReadDir("/proc/self/fd"); fileInfos != nil {
if fileInfos != nil {
for _, i := range fileInfos { for _, i := range fileInfos {
link, _ := os.Readlink(filepath.Join("/proc/self/fd", i.Name())) link, _ := osReadlink(filepath.Join("/proc/self/fd", i.Name()))
if link == name { if link == name {
fd, err := strconv.Atoi(i.Name()) fd, err := strconv.Atoi(i.Name())
if err == nil { if err == nil {
@ -371,7 +369,7 @@ func (devices *DeviceSet) ResizePool(size int64) error {
datafilename := path.Join(dirname, "data") datafilename := path.Join(dirname, "data")
metadatafilename := path.Join(dirname, "metadata") metadatafilename := path.Join(dirname, "metadata")
datafile, err := os.OpenFile(datafilename, os.O_RDWR, 0) datafile, err := osOpenFile(datafilename, osORdWr, 0)
if datafile == nil { if datafile == nil {
return err return err
} }
@ -386,19 +384,19 @@ func (devices *DeviceSet) ResizePool(size int64) error {
return fmt.Errorf("Can't shrink file") return fmt.Errorf("Can't shrink file")
} }
dataloopback := FindLoopDeviceFor(datafile) dataloopback := FindLoopDeviceFor(&osFile{File: datafile})
if dataloopback == nil { if dataloopback == nil {
return fmt.Errorf("Unable to find loopback mount for: %s", datafilename) return fmt.Errorf("Unable to find loopback mount for: %s", datafilename)
} }
defer dataloopback.Close() defer dataloopback.Close()
metadatafile, err := os.OpenFile(metadatafilename, os.O_RDWR, 0) metadatafile, err := osOpenFile(metadatafilename, osORdWr, 0)
if metadatafile == nil { if metadatafile == nil {
return err return err
} }
defer metadatafile.Close() defer metadatafile.Close()
metadataloopback := FindLoopDeviceFor(metadatafile) metadataloopback := FindLoopDeviceFor(&osFile{File: metadatafile})
if metadataloopback == nil { if metadataloopback == nil {
return fmt.Errorf("Unable to find loopback mount for: %s", metadatafilename) return fmt.Errorf("Unable to find loopback mount for: %s", metadatafilename)
} }
@ -463,7 +461,7 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
// Set the device prefix from the device id and inode of the docker root dir // Set the device prefix from the device id and inode of the docker root dir
st, err := os.Stat(devices.root) st, err := osStat(devices.root)
if err != nil { if err != nil {
return fmt.Errorf("Error looking up dir %s: %s", devices.root, err) return fmt.Errorf("Error looking up dir %s: %s", devices.root, err)
} }

25
graphdriver/devmapper/devmapper.go
View file

@ -4,7 +4,6 @@ import (
"errors" "errors"
"fmt" "fmt"
"github.com/dotcloud/docker/utils" "github.com/dotcloud/docker/utils"
"os"
"runtime" "runtime"
) )
@ -179,16 +178,16 @@ func (t *Task) GetNextTarget(next uintptr) (nextPtr uintptr, start uint64,
start, length, targetType, params start, length, targetType, params
} }
func AttachLoopDevice(filename string) (*os.File, error) { func AttachLoopDevice(filename string) (*osFile, error) {
var fd int var fd int
res := DmAttachLoopDevice(filename, &fd) res := DmAttachLoopDevice(filename, &fd)
if res == "" { if res == "" {
return nil, ErrAttachLoopbackDevice return nil, ErrAttachLoopbackDevice
} }
return os.NewFile(uintptr(fd), res), nil return &osFile{File: osNewFile(uintptr(fd), res)}, nil
} }
func getLoopbackBackingFile(file *os.File) (uint64, uint64, error) { func getLoopbackBackingFile(file *osFile) (uint64, uint64, error) {
dev, inode, err := dmGetLoopbackBackingFile(file.Fd()) dev, inode, err := dmGetLoopbackBackingFile(file.Fd())
if err != 0 { if err != 0 {
return 0, 0, ErrGetLoopbackBackingFile return 0, 0, ErrGetLoopbackBackingFile
@ -196,7 +195,7 @@ func getLoopbackBackingFile(file *os.File) (uint64, uint64, error) {
return dev, inode, nil return dev, inode, nil
} }
func LoopbackSetCapacity(file *os.File) error { func LoopbackSetCapacity(file *osFile) error {
err := dmLoopbackSetCapacity(file.Fd()) err := dmLoopbackSetCapacity(file.Fd())
if err != 0 { if err != 0 {
return ErrLoopbackSetCapacity return ErrLoopbackSetCapacity
@ -204,7 +203,7 @@ func LoopbackSetCapacity(file *os.File) error {
return nil return nil
} }
func FindLoopDeviceFor(file *os.File) *os.File { func FindLoopDeviceFor(file *osFile) *osFile {
stat, err := file.Stat() stat, err := file.Stat()
if err != nil { if err != nil {
return nil return nil
@ -215,9 +214,9 @@ func FindLoopDeviceFor(file *os.File) *os.File {
for i := 0; true; i++ { for i := 0; true; i++ {
path := fmt.Sprintf("/dev/loop%d", i) path := fmt.Sprintf("/dev/loop%d", i)
file, err := osOpenFile(path, os.O_RDWR, 0) file, err := osOpenFile(path, osORdWr, 0)
if err != nil { if err != nil {
if os.IsNotExist(err) { if osIsNotExist(err) {
return nil return nil
} }
@ -226,9 +225,9 @@ func FindLoopDeviceFor(file *os.File) *os.File {
continue continue
} }
dev, inode, err := getLoopbackBackingFile(file) dev, inode, err := getLoopbackBackingFile(&osFile{File: file})
if err == nil && dev == targetDevice && inode == targetInode { if err == nil && dev == targetDevice && inode == targetInode {
return file return &osFile{File: file}
} }
file.Close() file.Close()
@ -288,7 +287,7 @@ func RemoveDevice(name string) error {
return nil return nil
} }
func GetBlockDeviceSize(file *os.File) (uint64, error) { func GetBlockDeviceSize(file *osFile) (uint64, error) {
size, errno := DmGetBlockSize(file.Fd()) size, errno := DmGetBlockSize(file.Fd())
if size == -1 || errno != 0 { if size == -1 || errno != 0 {
return 0, ErrGetBlockSize return 0, ErrGetBlockSize
@ -297,7 +296,7 @@ func GetBlockDeviceSize(file *os.File) (uint64, error) {
} }
// This is the programmatic example of "dmsetup create" // This is the programmatic example of "dmsetup create"
func createPool(poolName string, dataFile *os.File, metadataFile *os.File) error { func createPool(poolName string, dataFile, metadataFile *osFile) error {
task, err := createTask(DeviceCreate, poolName) task, err := createTask(DeviceCreate, poolName)
if task == nil { if task == nil {
return err return err
@ -327,7 +326,7 @@ func createPool(poolName string, dataFile *os.File, metadataFile *os.File) error
return nil return nil
} }
func reloadPool(poolName string, dataFile *os.File, metadataFile *os.File) error { func reloadPool(poolName string, dataFile, metadataFile *osFile) error {
task, err := createTask(DeviceReload, poolName) task, err := createTask(DeviceReload, poolName)
if task == nil { if task == nil {
return err return err

5
graphdriver/devmapper/driver.go
View file

@ -4,7 +4,6 @@ import (
"fmt" "fmt"
"github.com/dotcloud/docker/graphdriver" "github.com/dotcloud/docker/graphdriver"
"io/ioutil" "io/ioutil"
"os"
"path" "path"
) )
@ -67,7 +66,7 @@ func (d *Driver) Create(id string, parent string) error {
return err return err
} }
if err := os.MkdirAll(path.Join(mp, "rootfs"), 0755); err != nil && !os.IsExist(err) { if err := osMkdirAll(path.Join(mp, "rootfs"), 0755); err != nil && !osIsExist(err) {
return err return err
} }
@ -98,7 +97,7 @@ func (d *Driver) Get(id string) (string, error) {
func (d *Driver) mount(id, mountPoint string) error { func (d *Driver) mount(id, mountPoint string) error {
// Create the target directories if they don't exist // Create the target directories if they don't exist
if err := os.MkdirAll(mountPoint, 0755); err != nil && !os.IsExist(err) { if err := osMkdirAll(mountPoint, 0755); err != nil && !osIsExist(err) {
return err return err
} }
// If mountpoint is already mounted, do nothing // If mountpoint is already mounted, do nothing

11
graphdriver/devmapper/driver_test.go
View file

@ -2,7 +2,6 @@ package devmapper
import ( import (
"io/ioutil" "io/ioutil"
"os"
"path" "path"
"testing" "testing"
) )
@ -34,12 +33,12 @@ func newDriver(t *testing.T) *Driver {
func cleanup(d *Driver) { func cleanup(d *Driver) {
d.Cleanup() d.Cleanup()
os.RemoveAll(d.home) osRemoveAll(d.home)
} }
func TestInit(t *testing.T) { func TestInit(t *testing.T) {
home := mkTestDirectory(t) home := mkTestDirectory(t)
defer os.RemoveAll(home) defer osRemoveAll(home)
driver, err := Init(home) driver, err := Init(home)
if err != nil { if err != nil {
t.Fatal(err) t.Fatal(err)
@ -58,7 +57,7 @@ func TestInit(t *testing.T) {
if err != nil { if err != nil {
t.Fatal(err) t.Fatal(err)
} }
if st, err := os.Stat(dir); err != nil { if st, err := osStat(dir); err != nil {
t.Fatal(err) t.Fatal(err)
} else if !st.IsDir() { } else if !st.IsDir() {
t.Fatalf("Get(%V) did not return a directory", id) t.Fatalf("Get(%V) did not return a directory", id)
@ -99,7 +98,7 @@ func TestDriverRemove(t *testing.T) {
func TestCleanup(t *testing.T) { func TestCleanup(t *testing.T) {
t.Skip("Unimplemented") t.Skip("Unimplemented")
d := newDriver(t) d := newDriver(t)
defer os.RemoveAll(d.home) defer osRemoveAll(d.home)
mountPoints := make([]string, 2) mountPoints := make([]string, 2)
@ -284,7 +283,7 @@ func TestDriverGetSize(t *testing.T) {
size := int64(1024) size := int64(1024)
f, err := os.Create(path.Join(mountPoint, "test_file")) f, err := osCreate(path.Join(mountPoint, "test_file"))
if err != nil { if err != nil {
t.Fatal(err) t.Fatal(err)
} }

7
graphdriver/devmapper/mount.go
View file

@ -1,7 +1,6 @@
package devmapper package devmapper
import ( import (
"os"
"path/filepath" "path/filepath"
) )
@ -9,14 +8,14 @@ import (
// It should be moved into the core. // It should be moved into the core.
func Mounted(mountpoint string) (bool, error) { func Mounted(mountpoint string) (bool, error) {
mntpoint, err := os.Stat(mountpoint) mntpoint, err := osStat(mountpoint)
if err != nil { if err != nil {
if os.IsNotExist(err) { if osIsNotExist(err) {
return false, nil return false, nil
} }
return false, err return false, err
} }
parent, err := os.Stat(filepath.Join(mountpoint, "..")) parent, err := osStat(filepath.Join(mountpoint, ".."))
if err != nil { if err != nil {
return false, err return false, err
} }

18
graphdriver/devmapper/sys.go
View file

@ -8,15 +8,26 @@ import (
type ( type (
sysStatT syscall.Stat_t sysStatT syscall.Stat_t
sysErrno syscall.Errno sysErrno syscall.Errno
osFile struct{ *os.File }
) )
var ( var (
// functions
sysMount = syscall.Mount sysMount = syscall.Mount
sysUnmount = syscall.Unmount sysUnmount = syscall.Unmount
sysCloseOnExec = syscall.CloseOnExec sysCloseOnExec = syscall.CloseOnExec
sysSyscall = syscall.Syscall sysSyscall = syscall.Syscall
osOpenFile = os.OpenFile
osOpenFile = os.OpenFile
osNewFile = os.NewFile
osCreate = os.Create
osStat = os.Stat
osIsNotExist = os.IsNotExist
osIsExist = os.IsExist
osMkdirAll = os.MkdirAll
osRemoveAll = os.RemoveAll
osRename = os.Rename
osReadlink = os.Readlink
) )
const ( const (
@ -24,6 +35,9 @@ const (
sysMsRdOnly = syscall.MS_RDONLY sysMsRdOnly = syscall.MS_RDONLY
sysEInval = syscall.EINVAL sysEInval = syscall.EINVAL
sysSysIoctl = syscall.SYS_IOCTL sysSysIoctl = syscall.SYS_IOCTL
osORdWr = os.O_RDWR
osOCreate = os.O_CREATE
) )
func toSysStatT(i interface{}) *sysStatT { func toSysStatT(i interface{}) *sysStatT {