Ejemplo n.º 1
0
// DefaultClientConfig creates a clientcmd.ClientConfig with the following hierarchy:
//   1.  Use the kubeconfig builder.  The number of merges and overrides here gets a little crazy.  Stay with me.
//       1.  Merge together the kubeconfig itself.  This is done with the following hierarchy rules:
//           1.  CommandLineLocation - this parsed from the command line, so it must be late bound.  If you specify this,
//               then no other kubeconfig files are merged.  This file must exist.
//           2.  If $KUBECONFIG is set, then it is treated as a list of files that should be merged.
//	     3.  HomeDirectoryLocation
//           Empty filenames are ignored.  Files with non-deserializable content produced errors.
//           The first file to set a particular value or map key wins and the value or map key is never changed.
//           This means that the first file to set CurrentContext will have its context preserved.  It also means
//           that if two files specify a "red-user", only values from the first file's red-user are used.  Even
//           non-conflicting entries from the second file's "red-user" are discarded.
//       2.  Determine the context to use based on the first hit in this chain
//           1.  command line argument - again, parsed from the command line, so it must be late bound
//           2.  CurrentContext from the merged kubeconfig file
//           3.  Empty is allowed at this stage
//       3.  Determine the cluster info and auth info to use.  At this point, we may or may not have a context.  They
//           are built based on the first hit in this chain.  (run it twice, once for auth, once for cluster)
//           1.  command line argument
//           2.  If context is present, then use the context value
//           3.  Empty is allowed
//       4.  Determine the actual cluster info to use.  At this point, we may or may not have a cluster info.  Build
//           each piece of the cluster info based on the chain:
//           1.  command line argument
//           2.  If cluster info is present and a value for the attribute is present, use it.
//           3.  If you don't have a server location, bail.
//       5.  Auth info is build using the same rules as cluster info, EXCEPT that you can only have one authentication
//           technique per auth info.  The following conditions result in an error:
//           1.  If there are two conflicting techniques specified from the command line, fail.
//           2.  If the command line does not specify one, and the auth info has conflicting techniques, fail.
//           3.  If the command line specifies one and the auth info specifies another, honor the command line technique.
//   2.  Use default values and potentially prompt for auth information
//
//   However, if it appears that we're running in a kubernetes cluster
//   container environment, then run with the auth info kubernetes mounted for
//   us. Specifically:
//     The env vars KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT are
//     set, and the file /var/run/secrets/kubernetes.io/serviceaccount/token
//     exists and is not a directory.
func DefaultClientConfig(flags *pflag.FlagSet) clientcmd.ClientConfig {
	loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
	flags.StringVar(&loadingRules.ExplicitPath, "kubeconfig", "", "Path to the kubeconfig file to use for CLI requests.")

	overrides := &clientcmd.ConfigOverrides{}
	flagNames := clientcmd.RecommendedConfigOverrideFlags("")
	// short flagnames are disabled by default.  These are here for compatibility with existing scripts
	flagNames.ClusterOverrideFlags.APIServer.ShortName = "s"

	clientcmd.BindOverrideFlags(overrides, flags, flagNames)
	clientConfig := clientcmd.NewInteractiveDeferredLoadingClientConfig(loadingRules, overrides, os.Stdin)

	return clientConfig
}
Ejemplo n.º 2
0
func NewDefaultPathOptions() *PathOptions {
	ret := &PathOptions{
		GlobalFile:       clientcmd.RecommendedHomeFile,
		EnvVar:           clientcmd.RecommendedConfigPathEnvVar,
		ExplicitFileFlag: clientcmd.RecommendedConfigPathFlag,

		GlobalFileSubpath: clientcmd.RecommendedHomeFileName,

		LoadingRules: clientcmd.NewDefaultClientConfigLoadingRules(),
	}
	ret.LoadingRules.DoNotResolvePaths = true

	return ret
}
Ejemplo n.º 3
0
// getStartingConfig returns the Config object built from the sources specified by the options, the filename read (only if it was a single file), and an error if something goes wrong
func (o *viewOptions) getStartingConfig() (*clientcmdapi.Config, string, error) {
	switch {
	case o.merge.Value():
		loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
		loadingRules.ExplicitPath = o.pathOptions.specifiedFile

		overrides := &clientcmd.ConfigOverrides{}
		clientConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, overrides)

		config, err := clientConfig.RawConfig()
		if err != nil {
			return nil, "", fmt.Errorf("Error getting config: %v", err)
		}
		return &config, "", nil
	default:
		return o.pathOptions.getStartingConfig()
	}
}
Ejemplo n.º 4
0
// NewEnviromentConfig sets up the initial config from environment variables
func NewEnviromentConfig() (*Config, error) {
	config := NewDefaultConfig()

	home := os.Getenv("GIT_HOME")
	if len(home) == 0 {
		return nil, fmt.Errorf("GIT_HOME is required")
	}
	abs, err := filepath.Abs(home)
	if err != nil {
		return nil, fmt.Errorf("can't make %q absolute: %v", home, err)
	}
	if stat, err := os.Stat(abs); err != nil || !stat.IsDir() {
		return nil, fmt.Errorf("GIT_HOME must be an existing directory: %v", err)
	}
	config.Home = home

	if publicURL := os.Getenv("PUBLIC_URL"); len(publicURL) > 0 {
		valid, err := url.Parse(publicURL)
		if err != nil {
			return nil, fmt.Errorf("PUBLIC_URL must be a valid URL: %v", err)
		}
		config.URL = valid
	}

	gitpath := os.Getenv("GIT_PATH")
	if len(gitpath) == 0 {
		path, err := exec.LookPath("git")
		if err != nil {
			return nil, fmt.Errorf("could not find 'git' in PATH; specify GIT_PATH or set your PATH")
		}
		gitpath = path
	}
	config.GitBinary = gitpath

	config.AllowPush = os.Getenv("ALLOW_GIT_PUSH") != "no"
	config.AllowHooks = os.Getenv("ALLOW_GIT_HOOKS") != "no"
	config.AllowLazyCreate = os.Getenv("ALLOW_LAZY_CREATE") != "no"

	if hookpath := os.Getenv("HOOK_PATH"); len(hookpath) != 0 {
		path, err := filepath.Abs(hookpath)
		if err != nil {
			return nil, fmt.Errorf("HOOK_PATH was set but cannot be made absolute: %v", err)
		}
		if stat, err := os.Stat(path); err != nil || !stat.IsDir() {
			return nil, fmt.Errorf("HOOK_PATH must be an existing directory if set: %v", err)
		}
		config.HookDirectory = path
	}

	allowAnonymousGet := os.Getenv("ALLOW_ANON_GIT_PULL") == "yes"
	serverAuth := os.Getenv("REQUIRE_SERVER_AUTH")
	gitAuth := os.Getenv("REQUIRE_GIT_AUTH")
	if len(serverAuth) > 0 && len(gitAuth) > 0 {
		return nil, fmt.Errorf("only one of REQUIRE_SERVER_AUTH or REQUIRE_GIT_AUTH may be specified")
	}

	if len(serverAuth) > 0 {
		namespace := os.Getenv("AUTH_NAMESPACE")
		if len(namespace) == 0 {
			return nil, fmt.Errorf("when REQUIRE_SERVER_AUTH is set, AUTH_NAMESPACE must also be specified")
		}

		if serverAuth == "-" {
			serverAuth = ""
		}
		rules := clientcmd.NewDefaultClientConfigLoadingRules()
		rules.ExplicitPath = serverAuth
		kubeconfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(rules, &clientcmd.ConfigOverrides{})
		cfg, err := kubeconfig.ClientConfig()
		if err != nil {
			return nil, fmt.Errorf("could not create a client for REQUIRE_SERVER_AUTH: %v", err)
		}
		osc, err := client.New(cfg)
		if err != nil {
			return nil, fmt.Errorf("could not create a client for REQUIRE_SERVER_AUTH: %v", err)
		}

		config.AuthMessage = fmt.Sprintf("Authenticating against %s allow-push=%t anon-pull=%t", cfg.Host, config.AllowPush, allowAnonymousGet)
		config.AuthenticatorFn = auth.Authenticator(func(info auth.AuthInfo) (bool, error) {
			if !info.Push && allowAnonymousGet {
				return true, nil
			}
			req := &authapi.SubjectAccessReview{
				Verb:     "get",
				Resource: "pods",
			}
			if info.Push {
				if !config.AllowPush {
					return false, nil
				}
				req.Verb = "create"
			}
			res, err := osc.ImpersonateSubjectAccessReviews(namespace, info.Password).Create(req)
			if err != nil {
				return false, err
			}
			//log.Printf("debug: server response allowed=%t message=%s", res.Allowed, res.Reason)
			return res.Allowed, nil
		})
	}

	if len(gitAuth) > 0 {
		parts := strings.Split(gitAuth, ":")
		if len(parts) != 2 {
			return nil, fmt.Errorf("REQUIRE_GIT_AUTH must be a username and password separated by a ':'")
		}
		config.AuthMessage = fmt.Sprintf("Authenticating against username/password allow-push=%t", config.AllowPush)
		username, password := parts[0], parts[1]
		config.AuthenticatorFn = auth.Authenticator(func(info auth.AuthInfo) (bool, error) {
			if info.Push {
				if !config.AllowPush {
					return false, nil
				}
				if allowAnonymousGet {
					return true, nil
				}
			}
			if info.Username != username || info.Password != password {
				return false, nil
			}
			return true, nil
		})
	}

	if value := os.Getenv("GIT_LISTEN"); len(value) > 0 {
		config.Listen = value
	}

	config.CleanBeforeClone = os.Getenv("GIT_FORCE_CLEAN") == "yes"

	clones := make(map[string]Clone)
	for _, env := range os.Environ() {
		if !strings.HasPrefix(env, initialClonePrefix) {
			continue
		}
		parts := strings.SplitN(env, "=", 2)
		if len(parts) != 2 {
			continue
		}
		key, value := parts[0], parts[1]
		part := key[len(initialClonePrefix):]
		if len(part) == 0 {
			continue
		}
		if len(value) == 0 {
			return nil, fmt.Errorf("%s must not have an empty value", key)
		}

		defaultName := strings.Replace(strings.ToLower(part), "_", "-", -1)
		values := strings.Split(value, ";")

		var uri, name string
		switch len(values) {
		case 1:
			uri, name = values[0], ""
		case 2:
			uri, name = values[0], values[1]
			if len(name) == 0 {
				return nil, fmt.Errorf("%s name may not be empty", key)
			}
		default:
			return nil, fmt.Errorf("%s may only have two segments (<url> or <url>;<name>)", key)
		}

		url, err := git.ParseRepository(uri)
		if err != nil {
			return nil, fmt.Errorf("%s is not a valid repository URI: %v", key, err)
		}
		switch url.Scheme {
		case "http", "https", "git", "ssh":
		default:
			return nil, fmt.Errorf("%s %q must be a http, https, git, or ssh URL", key, uri)
		}

		if len(name) == 0 {
			if n, ok := git.NameFromRepositoryURL(url); ok {
				name = n + ".git"
			}
		}
		if len(name) == 0 {
			name = defaultName + ".git"
		}

		if invalidCloneNameChars.MatchString(name) {
			return nil, fmt.Errorf("%s name %q must be only letters, numbers, dashes, or underscores", key, name)
		}
		if _, ok := reservedNames[name]; ok {
			return nil, fmt.Errorf("%s name %q is reserved (%v)", key, name, reservedNames)
		}

		clones[name] = Clone{
			URL: *url,
		}
	}
	config.InitialClones = clones

	return config, nil
}