Golang File.Chown方法代码示例

// Create implements pathfs.Filesystem.
func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Context) (fuseFile nodefs.File, code fuse.Status) {
	if fs.isFiltered(path) {
		return nil, fuse.EPERM
	}
	iflags, writeOnly := fs.mangleOpenFlags(flags)
	cPath, err := fs.getBackingPath(path)
	if err != nil {
		return nil, fuse.ToStatus(err)
	}

	var fd *os.File
	cName := filepath.Base(cPath)

	// Handle long file name
	if nametransform.IsLongContent(cName) {
		var dirfd *os.File
		dirfd, err = os.Open(filepath.Dir(cPath))
		if err != nil {
			return nil, fuse.ToStatus(err)
		}
		defer dirfd.Close()

		// Create ".name"
		err = fs.nameTransform.WriteLongName(dirfd, cName, path)
		if err != nil {
			return nil, fuse.ToStatus(err)
		}

		// Create content
		var fdRaw int
		fdRaw, err = syscallcompat.Openat(int(dirfd.Fd()), cName, iflags|os.O_CREATE, mode)
		if err != nil {
			nametransform.DeleteLongName(dirfd, cName)
			return nil, fuse.ToStatus(err)
		}
		fd = os.NewFile(uintptr(fdRaw), cName)
	} else {
		// Normal (short) file name
		fd, err = os.OpenFile(cPath, iflags|os.O_CREATE, os.FileMode(mode))
		if err != nil {
			return nil, fuse.ToStatus(err)
		}
	}
	// Set owner
	if fs.args.PreserveOwner {
		err = fd.Chown(int(context.Owner.Uid), int(context.Owner.Gid))
		if err != nil {
			tlog.Warn.Printf("Create: fd.Chown failed: %v", err)
		}
	}
	return NewFile(fd, writeOnly, fs)
}

func (u *Unarchiver) writeFile(blockSource chan block, workInProgress *sync.WaitGroup) {
	var file *os.File = nil
	var bufferedFile *bufio.Writer
	for block := range blockSource {
		if block.blockType == blockTypeStartOfFile {
			u.Logger.Verbose(block.filePath)

			if u.DryRun {
				continue
			}

			tmp, err := os.Create(block.filePath)
			if err != nil {
				u.Logger.Warning("File create error:", err.Error())
				file = nil
				continue
			}
			file = tmp
			bufferedFile = bufio.NewWriter(file)

			if !u.IgnoreOwners {
				err = file.Chown(block.uid, block.gid)
				if err != nil {
					u.Logger.Warning("Unable to chown file to", block.uid, "/", block.gid, ":", err.Error())
				}
			}
			if !u.IgnorePerms {
				err = file.Chmod(block.mode)
				if err != nil {
					u.Logger.Warning("Unable to chmod file to", block.mode, ":", err.Error())
				}
			}
		} else if file == nil {
			// do nothing; file couldn't be opened for write
		} else if block.blockType == blockTypeEndOfFile {
			bufferedFile.Flush()
			file.Close()
			file = nil
		} else {
			_, err := bufferedFile.Write(block.buffer[:block.numBytes])
			if err != nil {
				u.Logger.Warning("File write error:", err.Error())
			}
		}
	}
	workInProgress.Done()
}

/*
chownConfFile is responsible for changing the owner of a file
Input *os.File f     : file handler to a file that has already been opened
Input string id      : Service ID (example cd67c62b-e462-5137-2cd8-38732db4abd9)
Input string filename: zenmodeler_logstash_forwarder_conf
Input string owner   : update the file's owner to this provided string
Output bool          : returns true if: the owner parameter is not present present OR the file has been chowned to the requested owner successfully
*/
func chownConfFile(f *os.File, id string, filename string, owner string) bool {
	if len(owner) != 0 {
		parts := strings.Split(owner, ":")
		if len(parts) != 2 {
			glog.Errorf("Unsupported owner specification: %s, only %%d:%%d supported for now: %s, %s", owner, id, filename)
			return false
		}
		uid, err := strconv.Atoi(parts[0])
		if err != nil {
			glog.Warningf("Malformed UID: %s %s: %s", id, filename, err)
			return false
		}
		gid, err := strconv.Atoi(parts[0])
		if err != nil {
			glog.Warningf("Malformed GID: %s %s: %s", id, filename, err)
			return false
		}
		err = f.Chown(uid, gid)
		if err != nil {
			glog.Warningf("Could not chown config file: %s %s: %s", id, filename, err)
		}
	}
	return true
}

func (c *containerLXD) TemplateApply(trigger string) error {
	fname := path.Join(c.PathGet(""), "metadata.yaml")

	if !shared.PathExists(fname) {
		return nil
	}

	content, err := ioutil.ReadFile(fname)
	if err != nil {
		return err
	}

	metadata := new(imageMetadata)
	err = yaml.Unmarshal(content, &metadata)

	if err != nil {
		return fmt.Errorf("Could not parse %s: %v", fname, err)
	}

	for filepath, template := range metadata.Templates {
		var w *os.File

		found := false
		for _, tplTrigger := range template.When {
			if tplTrigger == trigger {
				found = true
				break
			}
		}

		if !found {
			continue
		}

		fullpath := shared.VarPath("containers", c.name, "rootfs", strings.TrimLeft(filepath, "/"))

		if shared.PathExists(fullpath) {
			w, err = os.Create(fullpath)
			if err != nil {
				return err
			}
		} else {
			uid := 0
			gid := 0
			if !c.IsPrivileged() {
				uid, gid = c.idmapset.ShiftIntoNs(0, 0)
			}
			shared.MkdirAllOwner(path.Dir(fullpath), 0755, uid, gid)

			w, err = os.Create(fullpath)
			if err != nil {
				return err
			}

			if !c.IsPrivileged() {
				w.Chown(uid, gid)
			}
			w.Chmod(0644)
		}

		tplString, err := ioutil.ReadFile(shared.VarPath("containers", c.name, "templates", template.Template))
		if err != nil {
			return err
		}

		tpl, err := pongo2.FromString("{% autoescape off %}" + string(tplString) + "{% endautoescape %}")
		if err != nil {
			return err
		}

		containerMeta := make(map[string]string)
		containerMeta["name"] = c.name
		containerMeta["architecture"], _ = shared.ArchitectureName(c.architecture)

		if c.ephemeral {
			containerMeta["ephemeral"] = "true"
		} else {
			containerMeta["ephemeral"] = "false"
		}

		if c.IsPrivileged() {
			containerMeta["privileged"] = "true"
		} else {
			containerMeta["privileged"] = "false"
		}

		configGet := func(confKey, confDefault *pongo2.Value) *pongo2.Value {
			val, ok := c.config[confKey.String()]
			if !ok {
				return confDefault
			}

			return pongo2.AsValue(strings.TrimRight(val, "\r\n"))
		}

		tpl.ExecuteWriter(pongo2.Context{"trigger": trigger,
			"path":       filepath,
			"container":  containerMeta,
			"config":     c.config,
			"devices":    c.devices,
//.........这里部分代码省略.........

func templateApply(c *lxdContainer, trigger string) error {
	fname := shared.VarPath("lxc", c.name, "metadata.yaml")

	if _, err := os.Stat(fname); err != nil {
		return nil
	}

	content, err := ioutil.ReadFile(fname)
	if err != nil {
		return err
	}

	metadata := new(imageMetadata)
	err = yaml.Unmarshal(content, &metadata)

	if err != nil {
		return fmt.Errorf("Could not parse %s: %v", fname, err)
	}

	for path, template := range metadata.Templates {
		var w *os.File

		found := false
		for _, tplTrigger := range template.When {
			if tplTrigger == trigger {
				found = true
				break
			}
		}

		if !found {
			continue
		}

		fpath := shared.VarPath("lxc", c.name, "rootfs", strings.TrimLeft(path, "/"))

		if _, err := os.Stat(fpath); err == nil {
			w, err = os.Create(fpath)
			if err != nil {
				return err
			}
		} else {
			w, err = os.Create(fpath)
			if err != nil {
				return err
			}

			uid, gid := c.idmapset.ShiftIntoNs(0, 0)
			w.Chown(uid, gid)
			w.Chmod(0644)
		}

		tpl, err := pongo2.FromFile(shared.VarPath("lxc", c.name, "templates", template.Template))
		if err != nil {
			return err
		}

		container_meta := make(map[string]string)
		container_meta["name"] = c.name
		container_meta["architecture"], _ = shared.ArchitectureName(c.architecture)

		if c.ephemeral {
			container_meta["ephemeral"] = "true"
		} else {
			container_meta["ephemeral"] = "false"
		}

		if c.isPrivileged() {
			container_meta["privileged"] = "true"
		} else {
			container_meta["privileged"] = "false"
		}

		tpl.ExecuteWriter(pongo2.Context{"trigger": trigger,
			"path":       path,
			"container":  container_meta,
			"config":     c.config,
			"devices":    c.devices,
			"properties": template.Properties}, w)
	}

	return nil
}