Switch Stat syscalls to x/sys/unix

Switch some more usage of the Stat function and the Stat_t type from the
syscall package to golang.org/x/sys. Those were missing in PR #33399.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

daemon/daemon_unix.go

@@ -14,7 +14,6 @@ import (
 	"runtime/debug"
 	"strconv"
 	"strings"
-	"syscall"
 	"time"
 
 	"github.com/Sirupsen/logrus"
@@ -46,6 +45,7 @@ import (
 	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 	"github.com/vishvananda/netlink"
+	"golang.org/x/sys/unix"
 )
 
 const (
@@ -146,11 +146,11 @@ func getCPUResources(config containertypes.Resources) (*specs.LinuxCPU, error) {
 }
 
 func getBlkioWeightDevices(config containertypes.Resources) ([]specs.LinuxWeightDevice, error) {
-	var stat syscall.Stat_t
+	var stat unix.Stat_t
 	var blkioWeightDevices []specs.LinuxWeightDevice
 
 	for _, weightDevice := range config.BlkioWeightDevice {
-		if err := syscall.Stat(weightDevice.Path, &stat); err != nil {
+		if err := unix.Stat(weightDevice.Path, &stat); err != nil {
 			return nil, err
 		}
 		weight := weightDevice.Weight
@@ -219,10 +219,10 @@ func parseSecurityOpt(container *container.Container, config *containertypes.Hos
 
 func getBlkioThrottleDevices(devs []*blkiodev.ThrottleDevice) ([]specs.LinuxThrottleDevice, error) {
 	var throttleDevices []specs.LinuxThrottleDevice
-	var stat syscall.Stat_t
+	var stat unix.Stat_t
 
 	for _, d := range devs {
-		if err := syscall.Stat(d.Path, &stat); err != nil {
+		if err := unix.Stat(d.Path, &stat); err != nil {
 			return nil, err
 		}
 		d := specs.LinuxThrottleDevice{Rate: d.Rate}

daemon/graphdriver/devmapper/deviceset.go

@@ -16,7 +16,6 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"syscall"
 	"time"
 
 	"github.com/Sirupsen/logrus"
@@ -1521,12 +1520,13 @@ func determineDriverCapabilities(version string) error {
 
 // Determine the major and minor number of loopback device
 func getDeviceMajorMinor(file *os.File) (uint64, uint64, error) {
-	stat, err := file.Stat()
+	var stat unix.Stat_t
+	err := unix.Stat(file.Name(), &stat)
 	if err != nil {
 		return 0, 0, err
 	}
 
-	dev := stat.Sys().(*syscall.Stat_t).Rdev
+	dev := stat.Rdev
 	majorNum := major(dev)
 	minorNum := minor(dev)
 
@@ -1725,18 +1725,17 @@ func (devices *DeviceSet) initDevmapper(doInit bool) (retErr error) {
 	}
 
 	// Set the device prefix from the device id and inode of the docker root dir
-	st, err := os.Stat(devices.root)
-	if err != nil {
+	var st unix.Stat_t
+	if err := unix.Stat(devices.root, &st); err != nil {
 		return fmt.Errorf("devmapper: Error looking up dir %s: %s", devices.root, err)
 	}
-	sysSt := st.Sys().(*syscall.Stat_t)
 	// "reg-" stands for "regular file".
 	// In the future we might use "dev-" for "device file", etc.
 	// docker-maj,min[-inode] stands for:
 	//	- Managed by docker
 	//	- The target of this device is at major <maj> and minor <min>
 	//	- If <inode> is defined, use that file inside the device as a loopback image. Otherwise use the device itself.
-	devices.devicePrefix = fmt.Sprintf("docker-%d:%d-%d", major(sysSt.Dev), minor(sysSt.Dev), sysSt.Ino)
+	devices.devicePrefix = fmt.Sprintf("docker-%d:%d-%d", major(st.Dev), minor(st.Dev), st.Ino)
 	logrus.Debugf("devmapper: Generated prefix: %s", devices.devicePrefix)
 
 	// Check for the existence of the thin-pool device

daemon/graphdriver/devmapper/mount.go

@@ -7,7 +7,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
-	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 // FIXME: this is copy-pasted from the aufs driver.
@@ -15,19 +16,17 @@ import (
 
 // Mounted returns true if a mount point exists.
 func Mounted(mountpoint string) (bool, error) {
-	mntpoint, err := os.Stat(mountpoint)
-	if err != nil {
+	var mntpointSt unix.Stat_t
+	if err := unix.Stat(mountpoint, &mntpointSt); err != nil {
 		if os.IsNotExist(err) {
 			return false, nil
 		}
 		return false, err
 	}
-	parent, err := os.Stat(filepath.Join(mountpoint, ".."))
-	if err != nil {
+	var parentSt unix.Stat_t
+	if err := unix.Stat(filepath.Join(mountpoint, ".."), &parentSt); err != nil {
 		return false, err
 	}
-	mntpointSt := mntpoint.Sys().(*syscall.Stat_t)
-	parentSt := parent.Sys().(*syscall.Stat_t)
 	return mntpointSt.Dev != parentSt.Dev, nil
 }
 

daemon/graphdriver/quota/projectquota.go

@@ -52,10 +52,8 @@ import "C"
 import (
 	"fmt"
 	"io/ioutil"
-	"os"
 	"path"
 	"path/filepath"
-	"syscall"
 	"unsafe"
 
 	"github.com/Sirupsen/logrus"
@@ -323,15 +321,14 @@ func getDirFd(dir *C.DIR) uintptr {
 // and create a block device node under the home directory
 // to be used by quotactl commands
 func makeBackingFsDev(home string) (string, error) {
-	fileinfo, err := os.Stat(home)
-	if err != nil {
+	var stat unix.Stat_t
+	if err := unix.Stat(home, &stat); err != nil {
 		return "", err
 	}
 
 	backingFsBlockDev := path.Join(home, "backingFsBlockDev")
 	// Re-create just in case someone copied the home directory over to a new device
 	unix.Unlink(backingFsBlockDev)
-	stat := fileinfo.Sys().(*syscall.Stat_t)
 	if err := unix.Mknod(backingFsBlockDev, unix.S_IFBLK|0600, int(stat.Dev)); err != nil {
 		return "", fmt.Errorf("Failed to mknod %s: %v", backingFsBlockDev, err)
 	}

pkg/idtools/idtools_unix_test.go

@@ -7,10 +7,10 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"syscall"
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"golang.org/x/sys/unix"
 )
 
 type node struct {
@@ -187,8 +187,8 @@ func readTree(base, root string) (map[string]node, error) {
 	}
 
 	for _, info := range dirInfos {
-		s := &syscall.Stat_t{}
-		if err := syscall.Stat(filepath.Join(base, info.Name()), s); err != nil {
+		s := &unix.Stat_t{}
+		if err := unix.Stat(filepath.Join(base, info.Name()), s); err != nil {
 			return nil, fmt.Errorf("Can't stat file %q: %v", filepath.Join(base, info.Name()), err)
 		}
 		tree[filepath.Join(root, info.Name())] = node{int(s.Uid), int(s.Gid)}

pkg/loopback/loopback.go

@@ -5,9 +5,9 @@ package loopback
 import (
 	"fmt"
 	"os"
-	"syscall"
 
 	"github.com/Sirupsen/logrus"
+	"golang.org/x/sys/unix"
 )
 
 func getLoopbackBackingFile(file *os.File) (uint64, uint64, error) {
@@ -31,12 +31,13 @@ func SetCapacity(file *os.File) error {
 // FindLoopDeviceFor returns a loopback device file for the specified file which
 // is backing file of a loop back device.
 func FindLoopDeviceFor(file *os.File) *os.File {
-	stat, err := file.Stat()
+	var stat unix.Stat_t
+	err := unix.Stat(file.Name(), &stat)
 	if err != nil {
 		return nil
 	}
-	targetInode := stat.Sys().(*syscall.Stat_t).Ino
-	targetDevice := stat.Sys().(*syscall.Stat_t).Dev
+	targetInode := stat.Ino
+	targetDevice := stat.Dev
 
 	for i := 0; true; i++ {
 		path := fmt.Sprintf("/dev/loop%d", i)