287 lines
8.8 KiB
Go
287 lines
8.8 KiB
Go
// Copyright 2016-2017, Pulumi Corporation. All rights reserved.
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package workspace
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import (
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"archive/tar"
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"compress/gzip"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strings"
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"time"
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"github.com/blang/semver"
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"github.com/djherbis/times"
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"github.com/golang/glog"
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"github.com/mitchellh/go-homedir"
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"github.com/pkg/errors"
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"github.com/pulumi/pulumi/pkg/util/contract"
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)
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// PluginInfo provides basic information about a plugin.
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type PluginInfo struct {
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Path string // the path to the plugin.
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Name string // the simple name of the plugin.
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Kind PluginKind // the kind of the plugin (language, resource, etc).
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Version *semver.Version // the plugin's semantic version, if present.
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Size int64 // the size of the plugin, in bytes.
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InstallTime time.Time // the time the plugin was installed.
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LastUsedTime time.Time // the last time the plugin was used.
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}
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// FilePrefix gets the expected default file prefix for the plugin.
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func (info PluginInfo) FilePrefix() string {
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return filePrefix(info.Kind, info.Name, info.Version)
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}
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// filePrefix gets the expected default file prefix for the plugin.
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func filePrefix(kind PluginKind, name string, version *semver.Version) string {
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prefix := fmt.Sprintf("pulumi-%s-%s", kind, name)
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if version != nil {
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prefix = fmt.Sprintf("%s-v%s", prefix, (*version).String())
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}
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return prefix
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}
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// Delete removes the plugin from the cache. It also deletes any supporting files in the cache, which includes
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// any files that contain the same prefix as the plugin itself.
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func (info PluginInfo) Delete() error {
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return os.Remove(info.Path)
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}
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// Install installs a plugin's tarball into the cache. It validates that plugin names are in the expected format.
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func (info PluginInfo) Install(tarball io.ReadCloser) error {
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// Fetch the directory into which we will expand this tarball.
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pluginDir, err := GetPluginDir()
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if err != nil {
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return err
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}
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// Unzip and untar the file as we go.
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defer contract.IgnoreClose(tarball)
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gzr, err := gzip.NewReader(tarball)
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if err != nil {
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return errors.Wrapf(err, "unzipping")
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}
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r := tar.NewReader(gzr)
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for {
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header, err := r.Next()
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if err == io.EOF {
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break
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} else if err != nil {
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return errors.Wrapf(err, "untarring")
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}
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switch header.Typeflag {
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case tar.TypeReg:
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// Ensure the file has the anticipated prefix.
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if !strings.HasPrefix(header.Name, info.FilePrefix()) {
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return errors.Errorf(
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"plugin file %s doesn't have the expected prefix %s", header.Name, info.FilePrefix())
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}
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// If so, expand it into the plugin home directory.
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dst, err := os.Create(filepath.Join(pluginDir, header.Name))
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if err != nil {
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return err
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}
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defer contract.IgnoreClose(dst)
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if _, err = io.Copy(dst, r); err != nil {
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return err
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}
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case tar.TypeDir:
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return errors.Errorf("unexpected plugin directory %s", header.Name)
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default:
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return errors.Errorf("unexpected plugin file type %s (%v)", header.Name, header.Typeflag)
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}
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}
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return nil
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}
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func (info PluginInfo) String() string {
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var version string
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if v := info.Version; v != nil {
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version = fmt.Sprintf("-%s", v)
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}
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return info.Name + version
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}
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// PluginKind represents a kind of a plugin that may be dynamically loaded and used by Pulumi.
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type PluginKind string
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const (
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// AnalyzerPlugin is a plugin that can be used as a resource analyzer.
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AnalyzerPlugin PluginKind = "analyzer"
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// LanguagePlugin is a plugin that can be used as a language host.
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LanguagePlugin PluginKind = "language"
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// ResourcePlugin is a plugin that can be used as a resource provider for custom CRUD operations.
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ResourcePlugin PluginKind = "resource"
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)
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// IsPluginKind returns true if k is a valid plugin kind, and false otherwise.
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func IsPluginKind(k string) bool {
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switch PluginKind(k) {
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case AnalyzerPlugin, LanguagePlugin, ResourcePlugin:
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return true
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default:
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return false
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}
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}
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// GetPluginDir returns the directory in which plugins on the current machine are managed.
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func GetPluginDir() (string, error) {
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home, err := homedir.Dir()
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if err != nil {
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return "", err
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}
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return filepath.Join(home, BookkeepingDir, PluginDir), nil
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}
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// GetPlugins returns a list of installed plugins.
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func GetPlugins() ([]PluginInfo, error) {
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// To get the list of plugins, simply scan the directory in the usual place.
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dir, err := GetPluginDir()
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if err != nil {
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return nil, err
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}
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files, err := ioutil.ReadDir(dir)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, nil
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}
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return nil, err
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}
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// Now read the file infos and create the plugin infos.
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var plugins []PluginInfo
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for _, file := range files {
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// Skip anything that doesn't look like a plugin.
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if kind, name, version, ok := isPlugin(file); ok {
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tinfo := times.Get(file)
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plugins = append(plugins, PluginInfo{
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Path: filepath.Join(dir, file.Name()),
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Name: name,
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Kind: kind,
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Version: &version,
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Size: file.Size(),
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InstallTime: tinfo.BirthTime(),
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LastUsedTime: tinfo.AccessTime(),
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})
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}
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}
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return plugins, nil
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}
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// GetPluginPath finds a plugin's path by its kind, name, and optional version. If no version is supplied, the latest
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// plugin for that given kind/name pair is loaded, using standard semver sorting rules.
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func GetPluginPath(kind PluginKind, name string, version *semver.Version) (string, error) {
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// First look on the path; first, for a version-specific plugin, and then for a version-agnostic one. This
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// supports development scenarios where we want to make it easy to override the central location.
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if version != nil {
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filename := filePrefix(kind, name, version)
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if path, err := exec.LookPath(filename); err == nil {
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glog.V(9).Infof("GetPluginPath(%s, %s, %v): found on path %s w/ version", kind, name, version, path)
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return path, nil
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}
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}
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filename := filePrefix(kind, name, nil)
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if path, err := exec.LookPath(filename); err == nil {
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glog.V(9).Infof("GetPluginPath(%s, %s, %v): found on path %s w/out version", kind, name, version, path)
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return path, nil
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}
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// If nothing was found on the path, fall back to the plugin cache.
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plugins, err := GetPlugins()
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if err != nil {
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return "", errors.Wrapf(err, "loading plugin list")
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}
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var match *PluginInfo
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for _, plugin := range plugins {
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if plugin.Kind == kind && plugin.Name == name {
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if version == nil {
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// If no version filter was specified, pick the most recent version. But we must also keep going
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// because we could later on find a version that is even more recent and should take precedence.
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if match == nil || match.Version == nil ||
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(plugin.Version != nil && (*match).Version.LT(*plugin.Version)) {
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match = &plugin
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}
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} else if plugin.Version != nil && (*version).EQ(*plugin.Version) {
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// If there's a specific version being sought, and we found it, we're done.
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match = &plugin
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break
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}
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}
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}
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if match == nil {
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return "", nil
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}
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glog.V(9).Infof("GetPluginPath(%s, %s, %v): found in cache at %s", kind, name, version, (*match).Path)
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return (*match).Path, nil
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}
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// pluginRegexp matches plugin filenames: pulumi-KIND-NAME-VERSION[.exe].
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var pluginRegexp = regexp.MustCompile(
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"^pulumi-" + // pulumi prefix
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"(?P<Kind>[a-z]+)-" + // KIND
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"(?P<Name>[a-zA-Z0-9-]*[a-zA-Z0-9])-" + // NAME
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"v(?P<Version>[0-9]+.[0-9]+.[0-9]+(-[a-zA-Z0-9-_.]+)?)" + // VERSION
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"(\\.exe)?$") // optional .exe extension on Windows
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// isPlugin returns true if a file is a plugin, and extracts information about it.
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func isPlugin(file os.FileInfo) (PluginKind, string, semver.Version, bool) {
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// Only files are plugins.
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if file.IsDir() {
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glog.V(11).Infof("skipping plugin as a directory: %s", file.Name())
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return "", "", semver.Version{}, false
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}
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// Filenames must match the plugin regexp.
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match := pluginRegexp.FindStringSubmatch(file.Name())
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if len(match) != len(pluginRegexp.SubexpNames()) {
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glog.V(11).Infof("skipping plugin %s with missing capture groups: expect=%d, actual=%d",
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file.Name(), len(pluginRegexp.SubexpNames()), len(match))
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return "", "", semver.Version{}, false
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}
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var kind PluginKind
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var name string
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var version *semver.Version
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for i, group := range pluginRegexp.SubexpNames() {
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v := match[i]
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switch group {
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case "Kind":
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// Skip invalid kinds.
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if IsPluginKind(v) {
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kind = PluginKind(v)
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} else {
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glog.V(11).Infof("skipping invalid plugin kind: %s", v)
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}
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case "Name":
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name = v
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case "Version":
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// Skip invalid versions.
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ver, err := semver.ParseTolerant(v)
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if err == nil {
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version = &ver
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} else {
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glog.V(11).Infof("skipping invalid plugin version: %s", v)
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}
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}
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}
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// If anything was missing or invalid, skip this plugin.
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if kind == "" || name == "" || version == nil {
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glog.V(11).Infof("skipping plugin with missing information: kind=%s, name=%s, version=%v",
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kind, name, version)
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return "", "", semver.Version{}, false
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}
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return kind, name, *version, true
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}
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