/
plugin_list.go
258 lines (217 loc) · 6.82 KB
/
plugin_list.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package cmd
import (
"bytes"
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/spf13/cobra"
"github.com/zntrio/harp/v2/pkg/sdk/cmdutil"
)
// ValidPluginFilenamePrefixes defines harp plugin prefix to discover
// cli plugin.
var validPluginFilenamePrefixes = []string{"harp", "harp"}
// -----------------------------------------------------------------------------
// PluginListOptions describes `plugin list` command options.
type pluginListOptions struct {
NameOnly bool
PluginPaths []string
Verifier pathVerifier
}
var pluginListCmd = func() *cobra.Command {
o := &pluginListOptions{}
cmd := &cobra.Command{
Use: "list",
Short: "List discovered cmd plugins",
Run: func(cmd *cobra.Command, args []string) {
if err := o.Complete(cmd); err != nil {
fmt.Fprintf(os.Stderr, "%v", err)
os.Exit(-1)
return
}
if err := o.Run(cmd); err != nil {
fmt.Fprintf(os.Stderr, "%v", err)
os.Exit(-1)
return
}
},
}
// Add flags
cmd.Flags().BoolVar(&o.NameOnly, "name-only", o.NameOnly, "If true, display only the binary name of each plugin, rather than its full path")
return cmd
}
func (o *pluginListOptions) Complete(cmd *cobra.Command) error {
o.PluginPaths = filepath.SplitList(os.Getenv("PATH"))
o.Verifier = &commandOverrideVerifier{
root: cmd.Root(),
seenPlugins: make(map[string]string),
}
return nil
}
//nolint:gocyclo,gocognit // refactor imported code
func (o *pluginListOptions) Run(cmd *cobra.Command) error {
_, cancel := cmdutil.Context(cmd.Context(), "harp-plugin-list", conf.Debug.Enabled, conf.Instrumentation.Logs.Level)
defer cancel()
var (
pluginsFound = false
isFirstFile = true
pluginErrors = []error{}
pluginWarnings = 0
)
// Deduplicate plugin paths
filteredPaths := uniquePathsList(o.PluginPaths)
// For each path
for _, dir := range filteredPaths {
// Ignore empty dir
if strings.TrimSpace(dir) == "" {
continue
}
// Crawl each directory to identify readable ones
files, err := os.ReadDir(dir)
if err != nil {
var pathErr *os.PathError
if errors.As(err, &pathErr) {
fmt.Fprintf(os.Stderr, "Unable read directory %q from your PATH: %v. Skipping...\n", dir, pathErr)
continue
}
pluginErrors = append(pluginErrors, fmt.Errorf("error: unable to read directory %q in your PATH: %w", dir, err))
continue
}
// Crawl each files
for _, f := range files {
if f.IsDir() {
continue
}
if !hasValidPrefix(f.Name(), validPluginFilenamePrefixes) {
continue
}
// First file identified
if isFirstFile {
fmt.Fprintf(os.Stdout, "The following compatible plugins are available:\n\n")
pluginsFound = true
isFirstFile = false
}
// Display name according to flag
pluginPath := f.Name()
if !o.NameOnly {
pluginPath = filepath.Join(dir, pluginPath)
}
fmt.Fprintf(os.Stdout, "%s\n", pluginPath)
if errs := o.Verifier.Verify(filepath.Join(dir, f.Name())); len(errs) != 0 {
for _, err := range errs {
fmt.Fprintf(os.Stderr, " - %s\n", err)
pluginWarnings++
}
}
}
}
if !pluginsFound {
pluginErrors = append(pluginErrors, fmt.Errorf("error: unable to find any harp plugins in your PATH"))
}
if pluginWarnings > 0 {
if pluginWarnings == 1 {
pluginErrors = append(pluginErrors, fmt.Errorf("error: one plugin warning was found"))
} else {
pluginErrors = append(pluginErrors, fmt.Errorf("error: %v plugin warnings were found", pluginWarnings))
}
}
if len(pluginErrors) > 0 {
errs := bytes.NewBuffer(nil)
for _, e := range pluginErrors {
fmt.Fprintln(errs, e)
}
return fmt.Errorf("%s", errs.String())
}
return nil
}
// -----------------------------------------------------------------------------
// pathVerifier receives a path and determines if it is valid or not.
type pathVerifier interface {
// Verify determines if a given path is valid
Verify(path string) []error
}
type commandOverrideVerifier struct {
root *cobra.Command
seenPlugins map[string]string
}
// Verify implements PathVerifier and determines if a given path
// is valid depending on whether or not it overwrites an existing
// harp command path, or a previously seen plugin.
func (v *commandOverrideVerifier) Verify(path string) []error {
if v.root == nil {
return []error{fmt.Errorf("unable to verify path with nil root")}
}
// extract the plugin binary name
segs := strings.Split(path, "/")
binName := segs[len(segs)-1]
cmdPath := strings.Split(binName, "-")
if len(cmdPath) > 1 {
// the first argument is always "harp" for a plugin binary
cmdPath = cmdPath[1:]
}
errorList := []error{}
if isExec, err := isExecutable(path); err == nil && !isExec {
errorList = append(errorList, fmt.Errorf("warning: %s identified as a harp plugin, but it is not executable", path))
} else if err != nil {
errorList = append(errorList, fmt.Errorf("error: unable to identify %s as an executable file: %w", path, err))
}
if existingPath, ok := v.seenPlugins[binName]; ok {
errorList = append(errorList, fmt.Errorf("warning: %s is overshadowed by a similarly named plugin: %s", path, existingPath))
} else {
v.seenPlugins[binName] = path
}
if cmd, _, err := v.root.Find(cmdPath); err == nil {
errorList = append(errorList, fmt.Errorf("warning: %s overwrites existing command: %q", binName, cmd.CommandPath()))
}
return errorList
}
func isExecutable(fullPath string) (bool, error) {
info, err := os.Stat(fullPath)
if err != nil {
return false, err
}
if m := info.Mode(); !m.IsDir() && m&0o111 != 0 {
return true, nil
}
return false, nil
}
// uniquePathsList deduplicates a given slice of strings without
// sorting or otherwise altering its order in any way.
func uniquePathsList(paths []string) []string {
seen := map[string]bool{}
newPaths := []string{}
for _, p := range paths {
if seen[p] {
continue
}
seen[p] = true
newPaths = append(newPaths, p)
}
return newPaths
}
func hasValidPrefix(filePath string, validPrefixes []string) bool {
for _, prefix := range validPrefixes {
if !strings.HasPrefix(filePath, prefix+"-") {
continue
}
return true
}
return false
}