package command import ( "encoding/json" "fmt" "io/ioutil" "log" "os" "os/exec" "path/filepath" "runtime" "strings" plugin "github.com/hashicorp/go-plugin" "github.com/kardianos/osext" "github.com/hashicorp/terraform/internal/logging" tfplugin "github.com/hashicorp/terraform/plugin" "github.com/hashicorp/terraform/plugin/discovery" "github.com/hashicorp/terraform/provisioners" ) // NOTE WELL: The logic in this file is primarily about plugin types OTHER THAN // providers, which use an older set of approaches implemented here. // // The provider-related functions live primarily in meta_providers.go, and // lean on some different underlying mechanisms in order to support automatic // installation and a hierarchical addressing namespace, neither of which // are supported for other plugin types. // store the user-supplied path for plugin discovery func (m *Meta) storePluginPath(pluginPath []string) error { if len(pluginPath) == 0 { return nil } path := filepath.Join(m.DataDir(), PluginPathFile) // remove the plugin dir record if the path was set to an empty string if len(pluginPath) == 1 && (pluginPath[0] == "") { err := os.Remove(path) if !os.IsNotExist(err) { return err } return nil } js, err := json.MarshalIndent(pluginPath, "", " ") if err != nil { return err } // if this fails, so will WriteFile os.MkdirAll(m.DataDir(), 0755) return ioutil.WriteFile(path, js, 0644) } // Load the user-defined plugin search path into Meta.pluginPath if the file // exists. func (m *Meta) loadPluginPath() ([]string, error) { js, err := ioutil.ReadFile(filepath.Join(m.DataDir(), PluginPathFile)) if os.IsNotExist(err) { return nil, nil } if err != nil { return nil, err } var pluginPath []string if err := json.Unmarshal(js, &pluginPath); err != nil { return nil, err } return pluginPath, nil } // the default location for automatically installed plugins func (m *Meta) pluginDir() string { return filepath.Join(m.DataDir(), "plugins", fmt.Sprintf("%s_%s", runtime.GOOS, runtime.GOARCH)) } // pluginDirs return a list of directories to search for plugins. // // Earlier entries in this slice get priority over later when multiple copies // of the same plugin version are found, but newer versions always override // older versions where both satisfy the provider version constraints. func (m *Meta) pluginDirs(includeAutoInstalled bool) []string { // user defined paths take precedence if len(m.pluginPath) > 0 { return m.pluginPath } // When searching the following directories, earlier entries get precedence // if the same plugin version is found twice, but newer versions will // always get preference below regardless of where they are coming from. // TODO: Add auto-install dir, default vendor dir and optional override // vendor dir(s). dirs := []string{"."} // Look in the same directory as the Terraform executable. // If found, this replaces what we found in the config path. exePath, err := osext.Executable() if err != nil { log.Printf("[ERROR] Error discovering exe directory: %s", err) } else { dirs = append(dirs, filepath.Dir(exePath)) } // add the user vendor directory dirs = append(dirs, DefaultPluginVendorDir) if includeAutoInstalled { dirs = append(dirs, m.pluginDir()) } dirs = append(dirs, m.GlobalPluginDirs...) return dirs } func (m *Meta) provisionerFactories() map[string]provisioners.Factory { dirs := m.pluginDirs(true) plugins := discovery.FindPlugins("provisioner", dirs) plugins, _ = plugins.ValidateVersions() // For now our goal is to just find the latest version of each plugin // we have on the system. All provisioners should be at version 0.0.0 // currently, so there should actually only be one instance of each plugin // name here, even though the discovery interface forces us to pretend // that might not be true. factories := make(map[string]provisioners.Factory) // Wire up the internal provisioners first. These might be overridden // by discovered provisioners below. for name := range InternalProvisioners { factories[name] = internalProvisionerFactory(discovery.PluginMeta{Name: name}) } byName := plugins.ByName() for name, metas := range byName { // Since we validated versions above and we partitioned the sets // by name, we're guaranteed that the metas in our set all have // valid versions and that there's at least one meta. newest := metas.Newest() factories[name] = provisionerFactory(newest) } return factories } func internalPluginClient(kind, name string) (*plugin.Client, error) { cmdLine, err := BuildPluginCommandString(kind, name) if err != nil { return nil, err } // See the docstring for BuildPluginCommandString for why we need to do // this split here. cmdArgv := strings.Split(cmdLine, TFSPACE) cfg := &plugin.ClientConfig{ Cmd: exec.Command(cmdArgv[0], cmdArgv[1:]...), HandshakeConfig: tfplugin.Handshake, Managed: true, VersionedPlugins: tfplugin.VersionedPlugins, AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC}, AutoMTLS: enableProviderAutoMTLS, Logger: logging.NewLogger(kind), } return plugin.NewClient(cfg), nil } func provisionerFactory(meta discovery.PluginMeta) provisioners.Factory { return func() (provisioners.Interface, error) { cfg := &plugin.ClientConfig{ Cmd: exec.Command(meta.Path), HandshakeConfig: tfplugin.Handshake, VersionedPlugins: tfplugin.VersionedPlugins, Managed: true, Logger: logging.NewLogger("provisioner"), AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC}, AutoMTLS: enableProviderAutoMTLS, } client := plugin.NewClient(cfg) return newProvisionerClient(client) } } func internalProvisionerFactory(meta discovery.PluginMeta) provisioners.Factory { return func() (provisioners.Interface, error) { client, err := internalPluginClient("provisioner", meta.Name) if err != nil { return nil, fmt.Errorf("[WARN] failed to build command line for internal plugin %q: %s", meta.Name, err) } return newProvisionerClient(client) } } func newProvisionerClient(client *plugin.Client) (provisioners.Interface, error) { // Request the RPC client so we can get the provisioner // so we can build the actual RPC-implemented provisioner. rpcClient, err := client.Client() if err != nil { return nil, err } raw, err := rpcClient.Dispense(tfplugin.ProvisionerPluginName) if err != nil { return nil, err } // store the client so that the plugin can kill the child process p := raw.(*tfplugin.GRPCProvisioner) p.PluginClient = client return p, nil }