Golang Context.AbsPath方法代码示例

func (c *ImageMetadataCommand) Run(context *cmd.Context) error {
	if err := c.setParams(context); err != nil {
		return err
	}
	out := context.Stdout
	im := &imagemetadata.ImageMetadata{
		Id:   c.ImageId,
		Arch: c.Arch,
	}
	cloudSpec := simplestreams.CloudSpec{
		Region:   c.Region,
		Endpoint: c.Endpoint,
	}
	targetStorage, err := filestorage.NewFileStorageWriter(c.Dir)
	if err != nil {
		return err
	}
	err = imagemetadata.MergeAndWriteMetadata(c.Series, []*imagemetadata.ImageMetadata{im}, &cloudSpec, targetStorage)
	if err != nil {
		return fmt.Errorf("image metadata files could not be created: %v", err)
	}
	dir := context.AbsPath(c.Dir)
	dest := filepath.Join(dir, storage.BaseImagesPath, "streams", "v1")
	fmt.Fprintf(out, fmt.Sprintf(helpDoc, dest, dir, dir))
	return nil
}

func writeServerFile(endpointProvider EndpointProvider, ctx *cmd.Context, username, password, outPath string) error {
	outPath = ctx.AbsPath(outPath)
	endpoint, err := endpointProvider.ConnectionEndpoint()
	if err != nil {
		return errors.Trace(err)
	}
	if !names.IsValidUser(username) {
		return errors.Errorf("%q is not a valid username", username)
	}
	outputInfo := modelcmd.ServerFile{
		Username:  username,
		Password:  password,
		Addresses: endpoint.Addresses,
		CACert:    endpoint.CACert,
	}
	yaml, err := cmd.FormatYaml(outputInfo)
	if err != nil {
		return errors.Trace(err)
	}
	if err := ioutil.WriteFile(outPath, yaml, 0644); err != nil {
		return errors.Trace(err)
	}
	serverFileNotify(outPath)
	ctx.Infof("server file written to %s", outPath)
	return nil
}

// Run connects to the specified environment and starts the charm
// upgrade process.
func (c *upgradeCharmCommand) Run(ctx *cmd.Context) error {
	client, err := c.NewAPIClient()
	if err != nil {
		return err
	}
	defer client.Close()
	oldURL, err := client.ServiceGetCharmURL(c.ServiceName)
	if err != nil {
		return err
	}

	conf, err := service.GetClientConfig(client)
	if err != nil {
		return errors.Trace(err)
	}

	var newRef *charm.Reference
	if c.SwitchURL != "" {
		newRef, err = charm.ParseReference(c.SwitchURL)
		if err != nil {
			return err
		}
	} else {
		// No new URL specified, but revision might have been.
		newRef = oldURL.WithRevision(c.Revision).Reference()
	}

	httpClient, err := c.HTTPClient()
	if err != nil {
		return errors.Trace(err)
	}
	csClient := newCharmStoreClient(httpClient)
	newURL, repo, err := resolveCharmStoreEntityURL(newRef.String(), csClient.params, ctx.AbsPath(c.RepoPath), conf)
	if err != nil {
		return errors.Trace(err)
	}

	// If no explicit revision was set with either SwitchURL
	// or Revision flags, discover the latest.
	if *newURL == *oldURL {
		if newRef.Revision != -1 {
			return fmt.Errorf("already running specified charm %q", newURL)
		}
		if newURL.Schema == "cs" {
			// No point in trying to upgrade a charm store charm when
			// we just determined that's the latest revision
			// available.
			return fmt.Errorf("already running latest charm %q", newURL)
		}
	}

	addedURL, err := addCharmViaAPI(client, newURL, repo, csClient)
	if err != nil {
		return block.ProcessBlockedError(err, block.BlockChange)
	}
	ctx.Infof("Added charm %q to the environment.", addedURL)

	return block.ProcessBlockedError(client.ServiceSetCharm(c.ServiceName, addedURL.String(), c.Force), block.BlockChange)
}

// Run connects to the specified environment and starts the charm
// upgrade process.
func (c *upgradeCharmCommand) Run(ctx *cmd.Context) error {
	client, err := c.NewAPIClient()
	if err != nil {
		return err
	}
	defer client.Close()

	serviceClient, err := c.newServiceAPIClient()
	if err != nil {
		return err
	}

	oldURL, err := serviceClient.GetCharmURL(c.ServiceName)
	if err != nil {
		return err
	}

	newRef := c.SwitchURL
	if newRef == "" {
		newRef = c.CharmPath
	}
	if c.SwitchURL == "" && c.CharmPath == "" {
		// No new URL specified, but revision might have been.
		newRef = oldURL.WithRevision(c.Revision).String()
	}

	bakeryClient, err := c.BakeryClient()
	if err != nil {
		return errors.Trace(err)
	}
	csClient := newCharmStoreClient(bakeryClient).WithChannel(c.Channel)

	conf, err := getClientConfig(client)
	if err != nil {
		return errors.Trace(err)
	}
	resolver := newCharmURLResolver(conf, csClient, ctx.AbsPath(c.RepoPath))
	chID, csMac, err := c.addCharm(oldURL, newRef, client, resolver)
	if err != nil {
		return block.ProcessBlockedError(err, block.BlockChange)
	}
	ctx.Infof("Added charm %q to the model.", chID.URL)

	ids, err := c.upgradeResources(client, chID, csMac)
	if err != nil {
		return errors.Trace(err)
	}

	cfg := apiservice.SetCharmConfig{
		ServiceName: c.ServiceName,
		CharmID:     chID,
		ForceSeries: c.ForceSeries,
		ForceUnits:  c.ForceUnits,
		ResourceIDs: ids,
	}

	return block.ProcessBlockedError(serviceClient.SetCharm(cfg), block.BlockChange)
}

func (c *signMetadataCommand) Run(context *cmd.Context) error {
	loggo.RegisterWriter("signmetadata", cmd.NewCommandLogWriter("juju.plugins.metadata", context.Stdout, context.Stderr), loggo.INFO)
	defer loggo.RemoveWriter("signmetadata")
	keyData, err := ioutil.ReadFile(c.keyFile)
	if err != nil {
		return err
	}
	dir := context.AbsPath(c.dir)
	return process(dir, string(keyData), c.passphrase)
}

func (c *RpcCommand) Run(ctx *cmd.Context) error {
	if c.Value == "error" {
		return errors.New("blam")
	}
	if c.Slow {
		time.Sleep(testing.ShortWait)
		return nil
	}
	ctx.Stdout.Write([]byte("eye of newt\n"))
	ctx.Stderr.Write([]byte("toe of frog\n"))
	return ioutil.WriteFile(ctx.AbsPath("local"), []byte(c.Value), 0644)
}

func (c *toolsMetadataCommand) Run(context *cmd.Context) error {
	loggo.RegisterWriter("toolsmetadata", cmd.NewCommandLogWriter("juju.environs.tools", context.Stdout, context.Stderr), loggo.INFO)
	defer loggo.RemoveWriter("toolsmetadata")
	if c.metadataDir == "" {
		c.metadataDir = osenv.JujuHome()
	} else {
		c.metadataDir = context.AbsPath(c.metadataDir)
	}

	sourceStorage, err := filestorage.NewFileStorageReader(c.metadataDir)
	if err != nil {
		return err
	}

	// We now store the tools in a directory named after their stream, but the
	// legacy behaviour is to store all tools in a single "releases" directory.
	toolsDir := c.stream
	if c.stream == "" {
		fmt.Fprintf(context.Stdout, "No stream specified, defaulting to released tools in the releases directory.\n")
		c.stream = envtools.ReleasedStream
		toolsDir = envtools.LegacyReleaseDirectory
	}
	fmt.Fprintf(context.Stdout, "Finding tools in %s for stream %s.\n", c.metadataDir, c.stream)
	const minorVersion = -1
	toolsList, err := envtools.ReadList(sourceStorage, toolsDir, version.Current.Major, minorVersion)
	if err == envtools.ErrNoTools {
		var source string
		source, err = envtools.ToolsURL(envtools.DefaultBaseURL)
		if err != nil {
			return err
		}
		sourceDataSource := simplestreams.NewURLDataSource("local source", source, utils.VerifySSLHostnames)
		toolsList, err = envtools.FindToolsForCloud(
			[]simplestreams.DataSource{sourceDataSource}, simplestreams.CloudSpec{}, c.stream,
			version.Current.Major, minorVersion, coretools.Filter{})
	}
	if err != nil {
		return err
	}

	targetStorage, err := filestorage.NewFileStorageWriter(c.metadataDir)
	if err != nil {
		return err
	}
	writeMirrors := envtools.DoNotWriteMirrors
	if c.public {
		writeMirrors = envtools.WriteMirrors
	}
	return mergeAndWriteMetadata(targetStorage, toolsDir, c.stream, c.clean, toolsList, writeMirrors)
}

func (c *toolsMetadataCommand) Run(context *cmd.Context) error {
	writer := loggo.NewMinimumLevelWriter(
		cmd.NewCommandLogWriter("juju.environs.tools", context.Stdout, context.Stderr),
		loggo.INFO)
	loggo.RegisterWriter("toolsmetadata", writer)
	defer loggo.RemoveWriter("toolsmetadata")
	if c.metadataDir == "" {
		c.metadataDir = osenv.JujuXDGDataHomeDir()
	} else {
		c.metadataDir = context.AbsPath(c.metadataDir)
	}

	sourceStorage, err := filestorage.NewFileStorageReader(c.metadataDir)
	if err != nil {
		return err
	}

	// We now store the tools in a directory named after their stream, but the
	// legacy behaviour is to store all tools in a single "releases" directory.
	toolsDir := c.stream
	if c.stream == "" {
		fmt.Fprintln(context.Stdout, "No stream specified, defaulting to released tools in the releases directory.")
		c.stream = envtools.ReleasedStream
		toolsDir = envtools.LegacyReleaseDirectory
	}
	fmt.Fprintf(context.Stdout, "Finding tools in %s for stream %s.\n", c.metadataDir, c.stream)
	toolsList, err := envtools.ReadList(sourceStorage, toolsDir, -1, -1)
	if err == envtools.ErrNoTools {
		var source string
		source, err = envtools.ToolsURL(envtools.DefaultBaseURL)
		if err != nil {
			return err
		}
		toolsList, err = envtools.FindToolsForCloud(toolsDataSources(source), simplestreams.CloudSpec{}, c.stream, -1, -1, coretools.Filter{})
	}
	if err != nil {
		return err
	}

	targetStorage, err := filestorage.NewFileStorageWriter(c.metadataDir)
	if err != nil {
		return err
	}
	writeMirrors := envtools.DoNotWriteMirrors
	if c.public {
		writeMirrors = envtools.WriteMirrors
	}
	return mergeAndWriteMetadata(targetStorage, toolsDir, c.stream, c.clean, toolsList, writeMirrors)
}

// readValue reads the value of an option out of the named file.
// An empty content is valid, like in parsing the options. The upper
// size is 5M.
func readValue(ctx *cmd.Context, filename string) (string, error) {
	absFilename := ctx.AbsPath(filename)
	fi, err := os.Stat(absFilename)
	if err != nil {
		return "", fmt.Errorf("cannot read option from file %q: %v", filename, err)
	}
	if fi.Size() > maxValueSize {
		return "", fmt.Errorf("size of option file is larger than 5M")
	}
	content, err := ioutil.ReadFile(ctx.AbsPath(filename))
	if err != nil {
		return "", fmt.Errorf("cannot read option from file %q: %v", filename, err)
	}
	return string(content), nil
}

// ReadAttrs reads attributes from the specified files, and then overlays
// the results with the k=v attributes.
func (f *ConfigFlag) ReadAttrs(ctx *cmd.Context) (map[string]interface{}, error) {
	attrs := make(map[string]interface{})
	for _, f := range f.files {
		path, err := utils.NormalizePath(f)
		if err != nil {
			return nil, errors.Trace(err)
		}
		data, err := ioutil.ReadFile(ctx.AbsPath(path))
		if err != nil {
			return nil, errors.Trace(err)
		}
		if err := yaml.Unmarshal(data, &attrs); err != nil {
			return nil, err
		}
	}
	for k, v := range f.attrs {
		attrs[k] = v
	}
	return attrs, nil
}

func (c *toolsMetadataCommand) Run(context *cmd.Context) error {
	writer := loggo.NewMinimumLevelWriter(
		cmd.NewCommandLogWriter("juju.environs.tools", context.Stdout, context.Stderr),
		loggo.INFO)
	loggo.RegisterWriter("toolsmetadata", writer)
	defer loggo.RemoveWriter("toolsmetadata")
	if c.metadataDir == "" {
		c.metadataDir = osenv.JujuXDGDataHomeDir()
	} else {
		c.metadataDir = context.AbsPath(c.metadataDir)
	}

	sourceStorage, err := filestorage.NewFileStorageReader(c.metadataDir)
	if err != nil {
		return errors.Trace(err)
	}

	fmt.Fprintf(context.Stdout, "Finding tools in %s for stream %s.\n", c.metadataDir, c.stream)
	toolsList, err := envtools.ReadList(sourceStorage, c.stream, -1, -1)
	if err == envtools.ErrNoTools {
		var source string
		source, err = envtools.ToolsURL(envtools.DefaultBaseURL)
		if err != nil {
			return errors.Trace(err)
		}
		toolsList, err = envtools.FindToolsForCloud(toolsDataSources(source), simplestreams.CloudSpec{}, c.stream, -1, -1, coretools.Filter{})
	}
	if err != nil {
		return errors.Trace(err)
	}

	targetStorage, err := filestorage.NewFileStorageWriter(c.metadataDir)
	if err != nil {
		return errors.Trace(err)
	}
	writeMirrors := envtools.DoNotWriteMirrors
	if c.public {
		writeMirrors = envtools.WriteMirrors
	}
	return errors.Trace(mergeAndWriteMetadata(targetStorage, c.stream, c.stream, c.clean, toolsList, writeMirrors))
}

func (c *ToolsMetadataCommand) Run(context *cmd.Context) error {
	loggo.RegisterWriter("toolsmetadata", cmd.NewCommandLogWriter("juju.environs.tools", context.Stdout, context.Stderr), loggo.INFO)
	defer loggo.RemoveWriter("toolsmetadata")
	if c.metadataDir == "" {
		c.metadataDir = osenv.JujuHome()
	} else {
		c.metadataDir = context.AbsPath(c.metadataDir)
	}

	sourceStorage, err := filestorage.NewFileStorageReader(c.metadataDir)
	if err != nil {
		return err
	}
	fmt.Fprintf(context.Stdout, "Finding tools in %s\n", c.metadataDir)
	const minorVersion = -1
	toolsList, err := envtools.ReadList(sourceStorage, version.Current.Major, minorVersion)
	if err == envtools.ErrNoTools {
		var source string
		source, err = envtools.ToolsURL(envtools.DefaultBaseURL)
		if err != nil {
			return err
		}
		sourceDataSource := simplestreams.NewURLDataSource("local source", source, utils.VerifySSLHostnames)
		toolsList, err = envtools.FindToolsForCloud(
			[]simplestreams.DataSource{sourceDataSource}, simplestreams.CloudSpec{},
			version.Current.Major, minorVersion, coretools.Filter{})
	}
	if err != nil {
		return err
	}

	targetStorage, err := filestorage.NewFileStorageWriter(c.metadataDir)
	if err != nil {
		return err
	}
	writeMirrors := envtools.DoNotWriteMirrors
	if c.public {
		writeMirrors = envtools.WriteMirrors
	}
	return mergeAndWriteMetadata(targetStorage, toolsList, writeMirrors)
}

func (c *dumpLogsCommand) dumpLogsForEnv(ctx *cmd.Context, st0 *state.State, tag names.ModelTag) error {
	st, err := st0.ForModel(tag)
	if err != nil {
		return errors.Annotate(err, "failed open model")
	}
	defer st.Close()

	logName := ctx.AbsPath(filepath.Join(c.outDir, fmt.Sprintf("%s.log", tag.Id())))
	ctx.Infof("writing to %s", logName)

	file, err := os.Create(logName)
	if err != nil {
		return errors.Annotate(err, "failed to open output file")
	}
	defer file.Close()

	writer := bufio.NewWriter(file)
	defer writer.Flush()

	tailer, err := state.NewLogTailer(st, &state.LogTailerParams{NoTail: true})
	if err != nil {
		return errors.Annotate(err, "failed to create a log tailer")
	}
	logs := tailer.Logs()
	for {
		rec, ok := <-logs
		if !ok {
			break
		}
		writer.WriteString(c.format(
			rec.Time,
			rec.Level,
			rec.Entity.String(),
			rec.Module,
			rec.Message,
		) + "\n")
	}

	return nil
}

func (c *DeployCommand) maybeReadLocalBundleData(ctx *cmd.Context) (
	_ *charm.BundleData, bundleFile string, bundleFilePath string, _ error,
) {
	bundleFile = c.CharmOrBundle
	bundleData, err := charmrepo.ReadBundleFile(bundleFile)
	if err == nil {
		// For local bundles, we extract the local path of
		// the bundle directory.
		bundleFilePath = filepath.Dir(ctx.AbsPath(bundleFile))
	} else {
		// We may have been given a local bundle archive or exploded directory.
		if bundle, burl, pathErr := charmrepo.NewBundleAtPath(bundleFile); pathErr == nil {
			bundleData = bundle.Data()
			bundleFile = burl.String()
			if info, err := os.Stat(bundleFile); err == nil && info.IsDir() {
				bundleFilePath = bundleFile
			}
			err = nil
		} else {
			err = pathErr
		}
	}
	return bundleData, bundleFile, bundleFilePath, err
}

// Run connects to the environment specified on the command line and bootstraps
// a juju in that environment if none already exists. If there is as yet no environments.yaml file,
// the user is informed how to create one.
func (c *BootstrapCommand) Run(ctx *cmd.Context) (resultErr error) {
	bootstrapFuncs := getBootstrapFuncs()

	if len(c.seriesOld) > 0 {
		fmt.Fprintln(ctx.Stderr, "Use of --series is obsolete. --upload-tools now expands to all supported series of the same operating system.")
	}
	if len(c.Series) > 0 {
		fmt.Fprintln(ctx.Stderr, "Use of --upload-series is obsolete. --upload-tools now expands to all supported series of the same operating system.")
	}

	envName := getEnvName(c)
	if envName == "" {
		return errors.Errorf("the name of the environment must be specified")
	}
	if err := checkProviderType(envName); errors.IsNotFound(err) {
		// This error will get handled later.
	} else if err != nil {
		return errors.Trace(err)
	}

	environ, cleanup, err := environFromName(
		ctx,
		envName,
		"Bootstrap",
		bootstrapFuncs.EnsureNotBootstrapped,
	)

	// If we error out for any reason, clean up the environment.
	defer func() {
		if resultErr != nil && cleanup != nil {
			if c.KeepBrokenEnvironment {
				logger.Warningf("bootstrap failed but --keep-broken was specified so environment is not being destroyed.\n" +
					"When you are finished diagnosing the problem, remember to run juju destroy-environment --force\n" +
					"to clean up the environment.")
			} else {
				handleBootstrapError(ctx, resultErr, cleanup)
			}
		}
	}()

	// Handle any errors from environFromName(...).
	if err != nil {
		return errors.Annotatef(err, "there was an issue examining the environment")
	}

	// Check to see if this environment is already bootstrapped. If it
	// is, we inform the user and exit early. If an error is returned
	// but it is not that the environment is already bootstrapped,
	// then we're in an unknown state.
	if err := bootstrapFuncs.EnsureNotBootstrapped(environ); nil != err {
		if environs.ErrAlreadyBootstrapped == err {
			logger.Warningf("This juju environment is already bootstrapped. If you want to start a new Juju\nenvironment, first run juju destroy-environment to clean up, or switch to an\nalternative environment.")
			return err
		}
		return errors.Annotatef(err, "cannot determine if environment is already bootstrapped.")
	}

	// Block interruption during bootstrap. Providers may also
	// register for interrupt notification so they can exit early.
	interrupted := make(chan os.Signal, 1)
	defer close(interrupted)
	ctx.InterruptNotify(interrupted)
	defer ctx.StopInterruptNotify(interrupted)
	go func() {
		for _ = range interrupted {
			ctx.Infof("Interrupt signalled: waiting for bootstrap to exit")
		}
	}()

	// If --metadata-source is specified, override the default tools metadata source so
	// SyncTools can use it, and also upload any image metadata.
	var metadataDir string
	if c.MetadataSource != "" {
		metadataDir = ctx.AbsPath(c.MetadataSource)
	}

	// TODO (wallyworld): 2013-09-20 bug 1227931
	// We can set a custom tools data source instead of doing an
	// unnecessary upload.
	if environ.Config().Type() == provider.Local {
		c.UploadTools = true
	}

	err = bootstrapFuncs.Bootstrap(envcmd.BootstrapContext(ctx), environ, bootstrap.BootstrapParams{
		Constraints:  c.Constraints,
		Placement:    c.Placement,
		UploadTools:  c.UploadTools,
		AgentVersion: c.AgentVersion,
		MetadataDir:  metadataDir,
	})
	if err != nil {
		return errors.Annotate(err, "failed to bootstrap environment")
	}
	err = c.SetBootstrapEndpointAddress(environ)
	if err != nil {
		return errors.Annotate(err, "saving bootstrap endpoint address")
	}
//.........这里部分代码省略.........