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package manager
import (
"fmt"
"net/url"
"os"
"strings"
"sync"
"github.com/docker/cli/cli/command"
"github.com/spf13/cobra"
"go.opentelemetry.io/otel/attribute"
)
const (
// CommandAnnotationPlugin is added to every stub command added by
// AddPluginCommandStubs with the value "true" and so can be
// used to distinguish plugin stubs from regular commands.
CommandAnnotationPlugin = "com.docker.cli.plugin"
// CommandAnnotationPluginVendor is added to every stub command
// added by AddPluginCommandStubs and contains the vendor of
// that plugin.
CommandAnnotationPluginVendor = "com.docker.cli.plugin.vendor"
// CommandAnnotationPluginVersion is added to every stub command
// added by AddPluginCommandStubs and contains the version of
// that plugin.
CommandAnnotationPluginVersion = "com.docker.cli.plugin.version"
// CommandAnnotationPluginInvalid is added to any stub command
// added by AddPluginCommandStubs for an invalid command (that
// is, one which failed it's candidate test) and contains the
// reason for the failure.
CommandAnnotationPluginInvalid = "com.docker.cli.plugin-invalid"
// CommandAnnotationPluginCommandPath is added to overwrite the
// command path for a plugin invocation.
CommandAnnotationPluginCommandPath = "com.docker.cli.plugin.command_path"
)
var pluginCommandStubsOnce sync.Once
// AddPluginCommandStubs adds a stub cobra.Commands for each valid and invalid
// plugin. The command stubs will have several annotations added, see
// `CommandAnnotationPlugin*`.
func AddPluginCommandStubs(dockerCli command.Cli, rootCmd *cobra.Command) (err error) {
pluginCommandStubsOnce.Do(func() {
var plugins []Plugin
plugins, err = ListPlugins(dockerCli, rootCmd)
if err != nil {
return
}
for _, p := range plugins {
p := p
vendor := p.Vendor
if vendor == "" {
vendor = "unknown"
}
annotations := map[string]string{
CommandAnnotationPlugin: "true",
CommandAnnotationPluginVendor: vendor,
CommandAnnotationPluginVersion: p.Version,
}
if p.Err != nil {
annotations[CommandAnnotationPluginInvalid] = p.Err.Error()
}
rootCmd.AddCommand(&cobra.Command{
Use: p.Name,
Short: p.ShortDescription,
Run: func(_ *cobra.Command, _ []string) {},
Annotations: annotations,
DisableFlagParsing: true,
RunE: func(cmd *cobra.Command, args []string) error {
flags := rootCmd.PersistentFlags()
flags.SetOutput(nil)
perr := flags.Parse(args)
if perr != nil {
return err
}
if flags.Changed("help") {
cmd.HelpFunc()(rootCmd, args)
return nil
}
return fmt.Errorf("docker: '%s' is not a docker command.\nSee 'docker --help'", cmd.Name())
},
ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
// Delegate completion to plugin
cargs := []string{p.Path, cobra.ShellCompRequestCmd, p.Name}
cargs = append(cargs, args...)
cargs = append(cargs, toComplete)
os.Args = cargs
runCommand, runErr := PluginRunCommand(dockerCli, p.Name, cmd)
if runErr != nil {
return nil, cobra.ShellCompDirectiveError
}
runErr = runCommand.Run()
if runErr == nil {
os.Exit(0) // plugin already rendered complete data
}
return nil, cobra.ShellCompDirectiveError
},
})
}
})
return err
}
const (
dockerCliAttributePrefix = attribute.Key("docker.cli")
cobraCommandPath = attribute.Key("cobra.command_path")
)
func getPluginResourceAttributes(cmd *cobra.Command, plugin Plugin) attribute.Set {
commandPath := cmd.Annotations[CommandAnnotationPluginCommandPath]
if commandPath == "" {
commandPath = fmt.Sprintf("%s %s", cmd.CommandPath(), plugin.Name)
}
attrSet := attribute.NewSet(
cobraCommandPath.String(commandPath),
)
kvs := make([]attribute.KeyValue, 0, attrSet.Len())
for iter := attrSet.Iter(); iter.Next(); {
attr := iter.Attribute()
kvs = append(kvs, attribute.KeyValue{
Key: dockerCliAttributePrefix + "." + attr.Key,
Value: attr.Value,
})
}
return attribute.NewSet(kvs...)
}
func appendPluginResourceAttributesEnvvar(env []string, cmd *cobra.Command, plugin Plugin) []string {
if attrs := getPluginResourceAttributes(cmd, plugin); attrs.Len() > 0 {
// values in environment variables need to be in baggage format
// otel/baggage package can be used after update to v1.22, currently it encodes incorrectly
attrsSlice := make([]string, attrs.Len())
for iter := attrs.Iter(); iter.Next(); {
i, v := iter.IndexedAttribute()
attrsSlice[i] = string(v.Key) + "=" + url.PathEscape(v.Value.AsString())
}
env = append(env, ResourceAttributesEnvvar+"="+strings.Join(attrsSlice, ","))
}
return env
}
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