github.com/lazyboychen7/engine@v17.12.1-ce-rc2+incompatible/volume/local/local_unix.go (about)

     1  // +build linux freebsd
     2  
     3  // Package local provides the default implementation for volumes. It
     4  // is used to mount data volume containers and directories local to
     5  // the host server.
     6  package local
     7  
     8  import (
     9  	"fmt"
    10  	"net"
    11  	"os"
    12  	"path/filepath"
    13  	"strings"
    14  	"syscall"
    15  	"time"
    16  
    17  	"github.com/pkg/errors"
    18  
    19  	"github.com/docker/docker/pkg/mount"
    20  )
    21  
    22  var (
    23  	oldVfsDir = filepath.Join("vfs", "dir")
    24  
    25  	validOpts = map[string]bool{
    26  		"type":   true, // specify the filesystem type for mount, e.g. nfs
    27  		"o":      true, // generic mount options
    28  		"device": true, // device to mount from
    29  	}
    30  )
    31  
    32  type optsConfig struct {
    33  	MountType   string
    34  	MountOpts   string
    35  	MountDevice string
    36  }
    37  
    38  func (o *optsConfig) String() string {
    39  	return fmt.Sprintf("type='%s' device='%s' o='%s'", o.MountType, o.MountDevice, o.MountOpts)
    40  }
    41  
    42  // scopedPath verifies that the path where the volume is located
    43  // is under Docker's root and the valid local paths.
    44  func (r *Root) scopedPath(realPath string) bool {
    45  	// Volumes path for Docker version >= 1.7
    46  	if strings.HasPrefix(realPath, filepath.Join(r.scope, volumesPathName)) && realPath != filepath.Join(r.scope, volumesPathName) {
    47  		return true
    48  	}
    49  
    50  	// Volumes path for Docker version < 1.7
    51  	if strings.HasPrefix(realPath, filepath.Join(r.scope, oldVfsDir)) {
    52  		return true
    53  	}
    54  
    55  	return false
    56  }
    57  
    58  func setOpts(v *localVolume, opts map[string]string) error {
    59  	if len(opts) == 0 {
    60  		return nil
    61  	}
    62  	if err := validateOpts(opts); err != nil {
    63  		return err
    64  	}
    65  
    66  	v.opts = &optsConfig{
    67  		MountType:   opts["type"],
    68  		MountOpts:   opts["o"],
    69  		MountDevice: opts["device"],
    70  	}
    71  	return nil
    72  }
    73  
    74  func (v *localVolume) mount() error {
    75  	if v.opts.MountDevice == "" {
    76  		return fmt.Errorf("missing device in volume options")
    77  	}
    78  	mountOpts := v.opts.MountOpts
    79  	if v.opts.MountType == "nfs" {
    80  		if addrValue := getAddress(v.opts.MountOpts); addrValue != "" && net.ParseIP(addrValue).To4() == nil {
    81  			ipAddr, err := net.ResolveIPAddr("ip", addrValue)
    82  			if err != nil {
    83  				return errors.Wrapf(err, "error resolving passed in nfs address")
    84  			}
    85  			mountOpts = strings.Replace(mountOpts, "addr="+addrValue, "addr="+ipAddr.String(), 1)
    86  		}
    87  	}
    88  	err := mount.Mount(v.opts.MountDevice, v.path, v.opts.MountType, mountOpts)
    89  	return errors.Wrapf(err, "error while mounting volume with options: %s", v.opts)
    90  }
    91  
    92  func (v *localVolume) CreatedAt() (time.Time, error) {
    93  	fileInfo, err := os.Stat(v.path)
    94  	if err != nil {
    95  		return time.Time{}, err
    96  	}
    97  	sec, nsec := fileInfo.Sys().(*syscall.Stat_t).Ctim.Unix()
    98  	return time.Unix(sec, nsec), nil
    99  }