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package commands
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"strings"
commands "github.com/ipfs/go-ipfs/commands"
cmds "gx/ipfs/QmQkW9fnCsg9SLHdViiAh6qfBppodsPZVpU92dZLqYtEfs/go-ipfs-cmds"
cmdkit "gx/ipfs/Qmde5VP1qUkyQXKCfmEUA7bP64V2HAptbJ7phuPp7jXWwg/go-ipfs-cmdkit"
)
func ExternalBinary() *cmds.Command {
return &cmds.Command{
Arguments: []cmdkit.Argument{
cmdkit.StringArg("args", false, true, "Arguments for subcommand."),
},
External: true,
Run: func(req *cmds.Request, res cmds.ResponseEmitter, env cmds.Environment) error {
binname := strings.Join(append([]string{"ipfs"}, req.Path...), "-")
_, err := exec.LookPath(binname)
if err != nil {
// special case for '--help' on uninstalled binaries.
for _, arg := range req.Arguments {
if arg == "--help" || arg == "-h" {
buf := new(bytes.Buffer)
fmt.Fprintf(buf, "%s is an 'external' command.\n", binname)
fmt.Fprintf(buf, "It does not currently appear to be installed.\n")
fmt.Fprintf(buf, "Please refer to the ipfs documentation for instructions.\n")
return res.Emit(buf)
}
}
return fmt.Errorf("%s not installed", binname)
}
r, w := io.Pipe()
cmd := exec.Command(binname, req.Arguments...)
// TODO: make commands lib be able to pass stdin through daemon
//cmd.Stdin = req.Stdin()
cmd.Stdin = io.LimitReader(nil, 0)
cmd.Stdout = w
cmd.Stderr = w
// setup env of child program
osenv := os.Environ()
// Get the node iff already defined.
if cctx, ok := env.(*commands.Context); ok && cctx.Online {
nd, err := cctx.GetNode()
if err != nil {
return fmt.Errorf("failed to start ipfs node: %s", err)
}
osenv = append(osenv, fmt.Sprintf("IPFS_ONLINE=%t", nd.OnlineMode()))
}
cmd.Env = osenv
err = cmd.Start()
if err != nil {
return fmt.Errorf("failed to start subcommand: %s", err)
}
errC := make(chan error)
go func() {
var err error
defer func() { errC <- err }()
err = cmd.Wait()
w.Close()
}()
err = res.Emit(r)
if err != nil {
return err
}
return <-errC
},
}
}
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