Golang user.LookupUser函數代碼示例

func (u *DefUser) Exists() (interface{}, error) {
	_, err := user.LookupUser(u.username)
	if err != nil {
		return false, nil
	}
	return true, nil
}

func (u *DefUser) Home() (interface{}, error) {
	user, err := user.LookupUser(u.username)
	if err != nil {
		return "", nil
	}

	return user.Home, nil
}

func (u *DefUser) GID() (interface{}, error) {
	user, err := user.LookupUser(u.username)
	if err != nil {
		return "", nil
	}

	return strconv.Itoa(user.Gid), nil
}

func (u *DefUser) Shell() (string, error) {
	user, err := user.LookupUser(u.username)
	if err != nil {
		return "", err
	}

	return user.Shell, nil
}

func (u *DefUser) Home() (string, error) {
	user, err := user.LookupUser(u.username)
	if err != nil {
		return "", err
	}

	return user.Home, nil
}

func (u *DefUser) GID() (int, error) {
	user, err := user.LookupUser(u.username)
	if err != nil {
		return 0, err
	}

	return user.Gid, nil
}

// GetWithSudoUser returns the home directory of the user who called sudo (if
// available, retrieved from $SUDO_USER). It fallbacks to Get if any error occurs.
// Returned path should be used with "path/filepath" to form new paths.
func GetWithSudoUser() string {
	sudoUser := os.Getenv("SUDO_USER")
	if sudoUser != "" {
		if user, err := user.LookupUser(sudoUser); err == nil {
			return user.Home
		}
	}
	return Get()
}

// LookupUser uses traditional local system files lookup (from libcontainer/user) on a username,
// followed by a call to `getent` for supporting host configured non-files passwd and group dbs
func LookupUser(username string) (user.User, error) {
	// first try a local system files lookup using existing capabilities
	usr, err := user.LookupUser(username)
	if err == nil {
		return usr, nil
	}
	// local files lookup failed; attempt to call `getent` to query configured passwd dbs
	usr, err = getentUser(fmt.Sprintf("%s %s", "passwd", username))
	if err != nil {
		return user.User{}, err
	}
	return usr, nil
}

func (u *DefUser) Groups() ([]string, error) {
	user, err := user.LookupUser(u.username)
	if err != nil {
		return nil, err
	}

	var groupList []string
	groups, err := lookupUserGroups(user)
	if err != nil {
		return nil, err
	}

	for _, g := range groups {
		groupList = append(groupList, g.Name)
	}

	sort.Strings(groupList)
	return groupList, nil
}

// Parse the remapped root (user namespace) option, which can be one of:
//   username            - valid username from /etc/passwd
//   username:groupname  - valid username; valid groupname from /etc/group
//   uid                 - 32-bit unsigned int valid Linux UID value
//   uid:gid             - uid value; 32-bit unsigned int Linux GID value
//
//  If no groupname is specified, and a username is specified, an attempt
//  will be made to lookup a gid for that username as a groupname
//
//  If names are used, they are verified to exist in passwd/group
func parseRemappedRoot(usergrp string) (string, string, error) {

	var (
		userID, groupID     int
		username, groupname string
	)

	idparts := strings.Split(usergrp, ":")
	if len(idparts) > 2 {
		return "", "", fmt.Errorf("Invalid user/group specification in --userns-remap: %q", usergrp)
	}

	if uid, err := strconv.ParseInt(idparts[0], 10, 32); err == nil {
		// must be a uid; take it as valid
		userID = int(uid)
		luser, err := user.LookupUid(userID)
		if err != nil {
			return "", "", fmt.Errorf("Uid %d has no entry in /etc/passwd: %v", userID, err)
		}
		username = luser.Name
		if len(idparts) == 1 {
			// if the uid was numeric and no gid was specified, take the uid as the gid
			groupID = userID
			lgrp, err := user.LookupGid(groupID)
			if err != nil {
				return "", "", fmt.Errorf("Gid %d has no entry in /etc/group: %v", groupID, err)
			}
			groupname = lgrp.Name
		}
	} else {
		lookupName := idparts[0]
		// special case: if the user specified "default", they want Docker to create or
		// use (after creation) the "dockremap" user/group for root remapping
		if lookupName == defaultIDSpecifier {
			lookupName = defaultRemappedID
		}
		luser, err := user.LookupUser(lookupName)
		if err != nil && idparts[0] != defaultIDSpecifier {
			// error if the name requested isn't the special "dockremap" ID
			return "", "", fmt.Errorf("Error during uid lookup for %q: %v", lookupName, err)
		} else if err != nil {
			// special case-- if the username == "default", then we have been asked
			// to create a new entry pair in /etc/{passwd,group} for which the /etc/sub{uid,gid}
			// ranges will be used for the user and group mappings in user namespaced containers
			_, _, err := idtools.AddNamespaceRangesUser(defaultRemappedID)
			if err == nil {
				return defaultRemappedID, defaultRemappedID, nil
			}
			return "", "", fmt.Errorf("Error during %q user creation: %v", defaultRemappedID, err)
		}
		userID = luser.Uid
		username = luser.Name
		if len(idparts) == 1 {
			// we only have a string username, and no group specified; look up gid from username as group
			group, err := user.LookupGroup(lookupName)
			if err != nil {
				return "", "", fmt.Errorf("Error during gid lookup for %q: %v", lookupName, err)
			}
			groupID = group.Gid
			groupname = group.Name
		}
	}

	if len(idparts) == 2 {
		// groupname or gid is separately specified and must be resolved
		// to a unsigned 32-bit gid
		if gid, err := strconv.ParseInt(idparts[1], 10, 32); err == nil {
			// must be a gid, take it as valid
			groupID = int(gid)
			lgrp, err := user.LookupGid(groupID)
			if err != nil {
				return "", "", fmt.Errorf("Gid %d has no entry in /etc/passwd: %v", groupID, err)
			}
			groupname = lgrp.Name
		} else {
			// not a number; attempt a lookup
			group, err := user.LookupGroup(idparts[1])
			if err != nil {
				return "", "", fmt.Errorf("Error during gid lookup for %q: %v", idparts[1], err)
			}
			groupID = group.Gid
			groupname = idparts[1]
		}
	}
	return username, groupname, nil
}

// Config takes ContainerJSON and Daemon Info and converts it into the opencontainers spec.
func Config(c types.ContainerJSON, info types.Info, capabilities []string) (config *specs.LinuxSpec, err error) {
	config = &specs.LinuxSpec{
		Spec: specs.Spec{
			Version: SpecVersion,
			Platform: specs.Platform{
				OS:   info.OSType,
				Arch: info.Architecture,
			},
			Process: specs.Process{
				Terminal: c.Config.Tty,
				User:     specs.User{
				// TODO: user stuffs
				},
				Args: append([]string{c.Path}, c.Args...),
				Env:  c.Config.Env,
				Cwd:  c.Config.WorkingDir,
			},
			Root: specs.Root{
				Path:     "rootfs",
				Readonly: c.HostConfig.ReadonlyRootfs,
			},
			Mounts: []specs.MountPoint{},
		},
	}

	// make sure the current working directory is not blank
	if config.Process.Cwd == "" {
		config.Process.Cwd = DefaultCurrentWorkingDirectory
	}

	// get the user
	if c.Config.User != "" {
		u, err := user.LookupUser(c.Config.User)
		if err != nil {
			config.Spec.Process.User = specs.User{
				UID: uint32(u.Uid),
				GID: uint32(u.Gid),
			}
		} else {
			//return nil, fmt.Errorf("Looking up user (%s) failed: %v", c.Config.User, err)
			logrus.Warnf("Looking up user (%s) failed: %v", c.Config.User, err)
		}
	}
	// add the additional groups
	for _, group := range c.HostConfig.GroupAdd {
		g, err := user.LookupGroup(group)
		if err != nil {
			return nil, fmt.Errorf("Looking up group (%s) failed: %v", group, err)
		}
		config.Spec.Process.User.AdditionalGids = append(config.Spec.Process.User.AdditionalGids, uint32(g.Gid))
	}

	// get the hostname, if the hostname is the name as the first 12 characters of the id,
	// then set the hostname as the container name
	if c.ID[:12] == c.Config.Hostname {
		config.Hostname = strings.TrimPrefix(c.Name, "/")
	}

	// get mounts
	mounts := map[string]bool{}
	for _, mount := range c.Mounts {
		mounts[mount.Destination] = true
		config.Mounts = append(config.Mounts, specs.MountPoint{
			Name: mount.Destination,
			Path: mount.Destination,
		})
	}

	// add /etc/hosts and /etc/resolv.conf if we should have networking
	if c.HostConfig.NetworkMode != "none" && c.HostConfig.NetworkMode != "host" {
		DefaultMounts = append(DefaultMounts, NetworkMounts...)
	}

	// if we aren't doing something crazy like mounting a default mount ourselves,
	// the we can mount it the default way
	for _, mount := range DefaultMounts {
		if _, ok := mounts[mount.Path]; !ok {
			config.Mounts = append(config.Mounts, mount)
		}
	}

	// set privileged
	if c.HostConfig.Privileged {
		// allow all caps
		capabilities = execdriver.GetAllCapabilities()
	}

	// get the capabilities
	config.Linux.Capabilities, err = execdriver.TweakCapabilities(capabilities, c.HostConfig.CapAdd.Slice(), c.HostConfig.CapDrop.Slice())
	if err != nil {
		return nil, fmt.Errorf("setting capabilities failed: %v", err)
	}

	// add CAP_ prefix
	// TODO: this is awful
	for i, cap := range config.Linux.Capabilities {
		if !strings.HasPrefix(cap, "CAP_") {
			config.Linux.Capabilities[i] = fmt.Sprintf("CAP_%s", cap)
		}
//.........這裏部分代碼省略.........

//.........這裏部分代碼省略.........
				Memory: &specs.Memory{
					Limit:       uint64ptr(c.HostConfig.Resources.Memory),
					Reservation: uint64ptr(c.HostConfig.Resources.MemoryReservation),
					Swap:        uint64ptr(c.HostConfig.Resources.MemorySwap),
					Swappiness:  uint64ptr(*c.HostConfig.Resources.MemorySwappiness),
					Kernel:      uint64ptr(c.HostConfig.Resources.KernelMemory),
				},
				CPU: &specs.CPU{
					Shares: uint64ptr(c.HostConfig.Resources.CPUShares),
					Quota:  uint64ptr(c.HostConfig.Resources.CPUQuota),
					Period: uint64ptr(c.HostConfig.Resources.CPUPeriod),
					Cpus:   &c.HostConfig.Resources.CpusetCpus,
					Mems:   &c.HostConfig.Resources.CpusetMems,
				},
				Pids: &specs.Pids{
					Limit: &c.HostConfig.Resources.PidsLimit,
				},
				BlockIO: &specs.BlockIO{
					Weight: &c.HostConfig.Resources.BlkioWeight,
					// TODO: add parsing for Throttle/Weight Devices
				},
			},
			RootfsPropagation: "",
		},
	}

	// make sure the current working directory is not blank
	if config.Process.Cwd == "" {
		config.Process.Cwd = DefaultCurrentWorkingDirectory
	}

	// get the user
	if c.Config.User != "" {
		u, err := user.LookupUser(c.Config.User)
		if err != nil {
			config.Process.User = specs.User{
				UID: uint32(u.Uid),
				GID: uint32(u.Gid),
			}
		} else {
			//return nil, fmt.Errorf("Looking up user (%s) failed: %v", c.Config.User, err)
			logrus.Warnf("Looking up user (%s) failed: %v", c.Config.User, err)
		}
	}
	// add the additional groups
	for _, group := range c.HostConfig.GroupAdd {
		g, err := user.LookupGroup(group)
		if err != nil {
			return nil, fmt.Errorf("Looking up group (%s) failed: %v", group, err)
		}
		config.Process.User.AdditionalGids = append(config.Process.User.AdditionalGids, uint32(g.Gid))
	}

	// get the hostname, if the hostname is the name as the first 12 characters of the id,
	// then set the hostname as the container name
	if c.ID[:12] == c.Config.Hostname {
		config.Hostname = strings.TrimPrefix(c.Name, "/")
	}

	// set privileged
	if c.HostConfig.Privileged {
		// allow all caps
		capabilities = execdriver.GetAllCapabilities()
	}

	// get the capabilities