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Merge pull request #1018 from cyphar/console-rewrite
Consoles, consoles, consoles.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,6 @@ | ||
| vendor/pkg | ||
| /runc | ||
| contrib/cmd/recvtty/recvtty | ||
| Godeps/_workspace/src/github.com/opencontainers/runc | ||
| man/man8 | ||
| release |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,247 @@ | ||
| /* | ||
| * Copyright 2016 SUSE LLC | ||
| * | ||
| * Licensed 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 main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "net" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/opencontainers/runc/libcontainer" | ||
| "github.com/opencontainers/runc/libcontainer/utils" | ||
| "github.com/urfave/cli" | ||
| ) | ||
|
|
||
| // version will be populated by the Makefile, read from | ||
| // VERSION file of the source code. | ||
| var version = "" | ||
|
|
||
| // gitCommit will be the hash that the binary was built from | ||
| // and will be populated by the Makefile | ||
| var gitCommit = "" | ||
|
|
||
| const ( | ||
| usage = `Open Container Initiative contrib/cmd/recvtty | ||
| recvtty is a reference implementation of a consumer of runC's --console-socket | ||
| API. It has two main modes of operation: | ||
| * single: Only permit one terminal to be sent to the socket, which is | ||
| then hooked up to the stdio of the recvtty process. This is useful | ||
| for rudimentary shell management of a container. | ||
| * null: Permit as many terminals to be sent to the socket, but they | ||
| are read to /dev/null. This is used for testing, and imitates the | ||
| old runC API's --console=/dev/pts/ptmx hack which would allow for a | ||
| similar trick. This is probably not what you want to use, unless | ||
| you're doing something like our bats integration tests. | ||
| To use recvtty, just specify a socket path at which you want to receive | ||
| terminals: | ||
| $ recvtty [--mode <single|null>] socket.sock | ||
| ` | ||
| ) | ||
|
|
||
| func bail(err error) { | ||
| fmt.Fprintf(os.Stderr, "[recvtty] fatal error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
|
||
| func handleSingle(path string) error { | ||
| // Open a socket. | ||
| ln, err := net.Listen("unix", path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer ln.Close() | ||
|
|
||
| // We only accept a single connection, since we can only really have | ||
| // one reader for os.Stdin. Plus this is all a PoC. | ||
| conn, err := ln.Accept() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| // Close ln, to allow for other instances to take over. | ||
| ln.Close() | ||
|
|
||
| // Get the fd of the connection. | ||
| unixconn, ok := conn.(*net.UnixConn) | ||
| if !ok { | ||
| return fmt.Errorf("failed to cast to unixconn") | ||
| } | ||
|
|
||
| socket, err := unixconn.File() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer socket.Close() | ||
|
|
||
| // Get the master file descriptor from runC. | ||
| master, err := utils.RecvFd(socket) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Print the file descriptor tag. | ||
| ti, err := libcontainer.GetTerminalInfo(master.Name()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| fmt.Printf("[recvtty] received masterfd: container '%s'\n", ti.ContainerID) | ||
|
|
||
| // Copy from our stdio to the master fd. | ||
| quitChan := make(chan struct{}) | ||
| go func() { | ||
| io.Copy(os.Stdout, master) | ||
| quitChan <- struct{}{} | ||
| }() | ||
| go func() { | ||
| io.Copy(master, os.Stdin) | ||
| quitChan <- struct{}{} | ||
| }() | ||
|
|
||
| // Only close the master fd once we've stopped copying. | ||
| <-quitChan | ||
| master.Close() | ||
| return nil | ||
| } | ||
|
|
||
| func handleNull(path string) error { | ||
| // Open a socket. | ||
| ln, err := net.Listen("unix", path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer ln.Close() | ||
|
|
||
| // As opposed to handleSingle we accept as many connections as we get, but | ||
| // we don't interact with Stdin at all (and we copy stdout to /dev/null). | ||
| for { | ||
| conn, err := ln.Accept() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| go func(conn net.Conn) { | ||
| // Don't leave references lying around. | ||
| defer conn.Close() | ||
|
|
||
| // Get the fd of the connection. | ||
| unixconn, ok := conn.(*net.UnixConn) | ||
| if !ok { | ||
| return | ||
| } | ||
|
|
||
| socket, err := unixconn.File() | ||
| if err != nil { | ||
| return | ||
| } | ||
| defer socket.Close() | ||
|
|
||
| // Get the master file descriptor from runC. | ||
| master, err := utils.RecvFd(socket) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| // Print the file descriptor tag. | ||
| ti, err := libcontainer.GetTerminalInfo(master.Name()) | ||
| if err != nil { | ||
| bail(err) | ||
| } | ||
| fmt.Printf("[recvtty] received masterfd: container '%s'\n", ti.ContainerID) | ||
|
|
||
| // Just do a dumb copy to /dev/null. | ||
| devnull, err := os.OpenFile("/dev/null", os.O_RDWR, 0) | ||
| if err != nil { | ||
| // TODO: Handle this nicely. | ||
| return | ||
| } | ||
|
|
||
| io.Copy(devnull, master) | ||
| devnull.Close() | ||
| }(conn) | ||
| } | ||
| } | ||
|
|
||
| func main() { | ||
| app := cli.NewApp() | ||
| app.Name = "recvtty" | ||
| app.Usage = usage | ||
|
|
||
| // Set version to be the same as runC. | ||
| var v []string | ||
| if version != "" { | ||
| v = append(v, version) | ||
| } | ||
| if gitCommit != "" { | ||
| v = append(v, fmt.Sprintf("commit: %s", gitCommit)) | ||
| } | ||
| app.Version = strings.Join(v, "\n") | ||
|
|
||
| // Set the flags. | ||
| app.Flags = []cli.Flag{ | ||
| cli.StringFlag{ | ||
| Name: "mode, m", | ||
| Value: "single", | ||
| Usage: "Mode of operation (single or null)", | ||
| }, | ||
| cli.StringFlag{ | ||
| Name: "pid-file", | ||
| Value: "", | ||
| Usage: "Path to write daemon process ID to", | ||
| }, | ||
| } | ||
|
|
||
| app.Action = func(ctx *cli.Context) error { | ||
| args := ctx.Args() | ||
| if len(args) != 1 { | ||
| return fmt.Errorf("need to specify a single socket path") | ||
| } | ||
| path := ctx.Args()[0] | ||
|
|
||
| pidPath := ctx.String("pid-file") | ||
| if pidPath != "" { | ||
| pid := fmt.Sprintf("%d\n", os.Getpid()) | ||
| if err := ioutil.WriteFile(pidPath, []byte(pid), 0644); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| switch ctx.String("mode") { | ||
| case "single": | ||
| if err := handleSingle(path); err != nil { | ||
| return err | ||
| } | ||
| case "null": | ||
| if err := handleNull(path); err != nil { | ||
| return err | ||
| } | ||
| default: | ||
| return fmt.Errorf("need to select a valid mode: %s", ctx.String("mode")) | ||
| } | ||
| return nil | ||
| } | ||
| if err := app.Run(os.Args); err != nil { | ||
| bail(err) | ||
| } | ||
| } |
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