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fabric.go
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fabric.go
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/*
Copyright State Street Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package main
import (
"fmt"
"os"
"os/exec"
"github.com/spf13/cobra"
"github.com/hyperledger/fabric-cli/cmd/commands"
"github.com/hyperledger/fabric-cli/pkg/environment"
"github.com/hyperledger/fabric-cli/pkg/plugin"
)
// NewFabricCommand returns a new root command for fabric
func NewFabricCommand(settings *environment.Settings) *cobra.Command {
cmd := &cobra.Command{
Use: "fabric",
Short: "The command line interface for Hyperledger Fabric",
}
// load all built in commands into the root command
cmd.AddCommand(commands.All(settings)...)
cmd.SetOutput(settings.Streams.Out)
return cmd
}
// NewDefaultFabricCommand returns a new default root commad for fabric
func NewDefaultFabricCommand(settings *environment.Settings, args []string) *cobra.Command {
cmd := NewFabricCommand(settings)
flags := cmd.PersistentFlags()
settings.AddFlags(flags)
flags.Parse(args)
if err := settings.Init(flags); err != nil {
fmt.Fprintf(settings.Streams.Err, "An error occurred while loading configurations: %v\n", err)
os.Exit(1)
}
// must resolve home and config file before loading config flags
settings.Config.AddFlags(flags)
if err := loadPlugins(cmd, settings, &plugin.DefaultHandler{
Dir: settings.Home.Plugins(),
Filename: plugin.DefaultFilename,
}); err != nil {
fmt.Fprintf(settings.Streams.Err, "An error occurred while loading plugins: %v\n", err)
os.Exit(1)
}
return cmd
}
func main() {
settings := environment.NewDefaultSettings()
cmd := NewDefaultFabricCommand(settings, os.Args[1:])
if err := cmd.Execute(); err != nil {
os.Exit(1)
}
os.Exit(0)
}
// loadPlugins processes all of the installed plugins, wraps them with cobra,
// and adds them to the root command
func loadPlugins(cmd *cobra.Command, settings *environment.Settings, handler plugin.Handler) error {
if settings.DisablePlugins {
return nil
}
plugins, err := handler.GetPlugins()
if err != nil {
return err
}
settings.SetupPluginEnvironment()
for _, p := range plugins {
c, err := loadPlugin(p, settings, handler)
if err != nil {
return err
}
cmd.AddCommand(c)
}
return nil
}
// loadPlugin loads the given plugin as either a Go plugin or a wrapped executable
func loadPlugin(p *plugin.Plugin, settings *environment.Settings, handler plugin.Handler) (*cobra.Command, error) {
path := os.ExpandEnv(p.Command.Base)
c, err := handler.LoadGoPlugin(path, settings)
if err == nil {
return c, nil
}
if err != plugin.ErrNotAGoPlugin {
return nil, err
}
return &cobra.Command{
Use: p.Name,
Short: p.Description,
RunE: func(cmd *cobra.Command, args []string) error {
e := exec.Command(path, append(p.Command.Args, args...)...)
e.Env = os.Environ()
e.Stdin = settings.Streams.In
e.Stdout = settings.Streams.Out
e.Stderr = settings.Streams.Err
return e.Run()
},
}, nil
}