libpod: Move oci_conmon_attach_linux.go to oci_conmon_attach_common.go

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

1 files changed, 0 insertions, 314 deletions

diff --git a/libpod/oci_conmon_attach_linux.go b/libpod/oci_conmon_attach_linux.go
deleted file mode 100644
index aa55aa6f5..000000000
--- a/libpod/oci_conmon_attach_linux.go
+++ /dev/null
@@ -1,314 +0,0 @@
-//go:build linux
-// +build linux
-
-package libpod
-
-import (
-	"errors"
-	"fmt"
-	"io"
-	"net"
-	"os"
-	"path/filepath"
-	"syscall"
-
-	"github.com/containers/common/pkg/config"
-	"github.com/containers/common/pkg/resize"
-	"github.com/containers/common/pkg/util"
-	"github.com/containers/podman/v4/libpod/define"
-	"github.com/containers/podman/v4/pkg/errorhandling"
-	"github.com/moby/term"
-	"github.com/sirupsen/logrus"
-	"golang.org/x/sys/unix"
-)
-
-/* Sync with stdpipe_t in conmon.c */
-const (
-	AttachPipeStdin  = 1
-	AttachPipeStdout = 2
-	AttachPipeStderr = 3
-)
-
-func openUnixSocket(path string) (*net.UnixConn, error) {
-	fd, err := unix.Open(path, unix.O_PATH, 0)
-	if err != nil {
-		return nil, err
-	}
-	defer unix.Close(fd)
-	return net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: fmt.Sprintf("/proc/self/fd/%d", fd), Net: "unixpacket"})
-}
-
-// Attach to the given container.
-// Does not check if state is appropriate.
-// started is only required if startContainer is true.
-func (r *ConmonOCIRuntime) Attach(c *Container, params *AttachOptions) error {
-	passthrough := c.LogDriver() == define.PassthroughLogging
-
-	if params == nil || params.Streams == nil {
-		return fmt.Errorf("must provide parameters to Attach: %w", define.ErrInternal)
-	}
-
-	if !params.Streams.AttachOutput && !params.Streams.AttachError && !params.Streams.AttachInput && !passthrough {
-		return fmt.Errorf("must provide at least one stream to attach to: %w", define.ErrInvalidArg)
-	}
-	if params.Start && params.Started == nil {
-		return fmt.Errorf("started chan not passed when startContainer set: %w", define.ErrInternal)
-	}
-
-	keys := config.DefaultDetachKeys
-	if params.DetachKeys != nil {
-		keys = *params.DetachKeys
-	}
-
-	detachKeys, err := processDetachKeys(keys)
-	if err != nil {
-		return err
-	}
-
-	var conn *net.UnixConn
-	if !passthrough {
-		logrus.Debugf("Attaching to container %s", c.ID())
-
-		// If we have a resize, do it.
-		if params.InitialSize != nil {
-			if err := r.AttachResize(c, *params.InitialSize); err != nil {
-				return err
-			}
-		}
-
-		attachSock, err := c.AttachSocketPath()
-		if err != nil {
-			return err
-		}
-
-		conn, err = openUnixSocket(attachSock)
-		if err != nil {
-			return fmt.Errorf("failed to connect to container's attach socket: %v: %w", attachSock, err)
-		}
-		defer func() {
-			if err := conn.Close(); err != nil {
-				logrus.Errorf("unable to close socket: %q", err)
-			}
-		}()
-	}
-
-	// If starting was requested, start the container and notify when that's
-	// done.
-	if params.Start {
-		if err := c.start(); err != nil {
-			return err
-		}
-		params.Started <- true
-	}
-
-	if passthrough {
-		return nil
-	}
-
-	receiveStdoutError, stdinDone := setupStdioChannels(params.Streams, conn, detachKeys)
-	if params.AttachReady != nil {
-		params.AttachReady <- true
-	}
-	return readStdio(conn, params.Streams, receiveStdoutError, stdinDone)
-}
-
-// Attach to the given container's exec session
-// attachFd and startFd must be open file descriptors
-// attachFd must be the output side of the fd. attachFd is used for two things:
-//  conmon will first send a nonce value across the pipe indicating it has set up its side of the console socket
-//    this ensures attachToExec gets all of the output of the called process
-//  conmon will then send the exit code of the exec process, or an error in the exec session
-// startFd must be the input side of the fd.
-// newSize resizes the tty to this size before the process is started, must be nil if the exec session has no tty
-//   conmon will wait to start the exec session until the parent process has set up the console socket.
-//   Once attachToExec successfully attaches to the console socket, the child conmon process responsible for calling runtime exec
-//     will read from the output side of start fd, thus learning to start the child process.
-// Thus, the order goes as follow:
-// 1. conmon parent process sets up its console socket. sends on attachFd
-// 2. attachToExec attaches to the console socket after reading on attachFd and resizes the tty
-// 3. child waits on startFd for attachToExec to attach to said console socket
-// 4. attachToExec sends on startFd, signalling it has attached to the socket and child is ready to go
-// 5. child receives on startFd, runs the runtime exec command
-// attachToExec is responsible for closing startFd and attachFd
-func (c *Container) attachToExec(streams *define.AttachStreams, keys *string, sessionID string, startFd, attachFd *os.File, newSize *resize.TerminalSize) error {
-	if !streams.AttachOutput && !streams.AttachError && !streams.AttachInput {
-		return fmt.Errorf("must provide at least one stream to attach to: %w", define.ErrInvalidArg)
-	}
-	if startFd == nil || attachFd == nil {
-		return fmt.Errorf("start sync pipe and attach sync pipe must be defined for exec attach: %w", define.ErrInvalidArg)
-	}
-
-	defer errorhandling.CloseQuiet(startFd)
-	defer errorhandling.CloseQuiet(attachFd)
-
-	detachString := config.DefaultDetachKeys
-	if keys != nil {
-		detachString = *keys
-	}
-	detachKeys, err := processDetachKeys(detachString)
-	if err != nil {
-		return err
-	}
-
-	logrus.Debugf("Attaching to container %s exec session %s", c.ID(), sessionID)
-
-	// set up the socket path, such that it is the correct length and location for exec
-	sockPath, err := c.execAttachSocketPath(sessionID)
-	if err != nil {
-		return err
-	}
-
-	// 2: read from attachFd that the parent process has set up the console socket
-	if _, err := readConmonPipeData(c.ociRuntime.Name(), attachFd, ""); err != nil {
-		return err
-	}
-
-	// resize before we start the container process
-	if newSize != nil {
-		err = c.ociRuntime.ExecAttachResize(c, sessionID, *newSize)
-		if err != nil {
-			logrus.Warnf("Resize failed: %v", err)
-		}
-	}
-
-	// 2: then attach
-	conn, err := openUnixSocket(sockPath)
-	if err != nil {
-		return fmt.Errorf("failed to connect to container's attach socket: %v: %w", sockPath, err)
-	}
-	defer func() {
-		if err := conn.Close(); err != nil {
-			logrus.Errorf("Unable to close socket: %q", err)
-		}
-	}()
-
-	// start listening on stdio of the process
-	receiveStdoutError, stdinDone := setupStdioChannels(streams, conn, detachKeys)
-
-	// 4: send start message to child
-	if err := writeConmonPipeData(startFd); err != nil {
-		return err
-	}
-
-	return readStdio(conn, streams, receiveStdoutError, stdinDone)
-}
-
-func processDetachKeys(keys string) ([]byte, error) {
-	// Check the validity of the provided keys first
-	if len(keys) == 0 {
-		return []byte{}, nil
-	}
-	detachKeys, err := term.ToBytes(keys)
-	if err != nil {
-		return nil, fmt.Errorf("invalid detach keys: %w", err)
-	}
-	return detachKeys, nil
-}
-
-func registerResizeFunc(r <-chan resize.TerminalSize, bundlePath string) {
-	resize.HandleResizing(r, func(size resize.TerminalSize) {
-		controlPath := filepath.Join(bundlePath, "ctl")
-		controlFile, err := os.OpenFile(controlPath, unix.O_WRONLY, 0)
-		if err != nil {
-			logrus.Debugf("Could not open ctl file: %v", err)
-			return
-		}
-		defer controlFile.Close()
-
-		logrus.Debugf("Received a resize event: %+v", size)
-		if _, err = fmt.Fprintf(controlFile, "%d %d %d\n", 1, size.Height, size.Width); err != nil {
-			logrus.Warnf("Failed to write to control file to resize terminal: %v", err)
-		}
-	})
-}
-
-func setupStdioChannels(streams *define.AttachStreams, conn *net.UnixConn, detachKeys []byte) (chan error, chan error) {
-	receiveStdoutError := make(chan error)
-	go func() {
-		receiveStdoutError <- redirectResponseToOutputStreams(streams.OutputStream, streams.ErrorStream, streams.AttachOutput, streams.AttachError, conn)
-	}()
-
-	stdinDone := make(chan error)
-	go func() {
-		var err error
-		if streams.AttachInput {
-			_, err = util.CopyDetachable(conn, streams.InputStream, detachKeys)
-		}
-		stdinDone <- err
-	}()
-
-	return receiveStdoutError, stdinDone
-}
-
-func redirectResponseToOutputStreams(outputStream, errorStream io.Writer, writeOutput, writeError bool, conn io.Reader) error {
-	var err error
-	buf := make([]byte, 8192+1) /* Sync with conmon STDIO_BUF_SIZE */
-	for {
-		nr, er := conn.Read(buf)
-		if nr > 0 {
-			var dst io.Writer
-			var doWrite bool
-			switch buf[0] {
-			case AttachPipeStdout:
-				dst = outputStream
-				doWrite = writeOutput
-			case AttachPipeStderr:
-				dst = errorStream
-				doWrite = writeError
-			default:
-				logrus.Infof("Received unexpected attach type %+d", buf[0])
-			}
-			if dst == nil {
-				return errors.New("output destination cannot be nil")
-			}
-
-			if doWrite {
-				nw, ew := dst.Write(buf[1:nr])
-				if ew != nil {
-					err = ew
-					break
-				}
-				if nr != nw+1 {
-					err = io.ErrShortWrite
-					break
-				}
-			}
-		}
-		if errors.Is(er, io.EOF) || errors.Is(er, syscall.ECONNRESET) {
-			break
-		}
-		if er != nil {
-			err = er
-			break
-		}
-	}
-	return err
-}
-
-func readStdio(conn *net.UnixConn, streams *define.AttachStreams, receiveStdoutError, stdinDone chan error) error {
-	var err error
-	select {
-	case err = <-receiveStdoutError:
-		if err := conn.CloseWrite(); err != nil {
-			logrus.Errorf("Failed to close stdin: %v", err)
-		}
-		return err
-	case err = <-stdinDone:
-		if err == define.ErrDetach {
-			if err := conn.CloseWrite(); err != nil {
-				logrus.Errorf("Failed to close stdin: %v", err)
-			}
-			return err
-		}
-		if err == nil {
-			// copy stdin is done, close it
-			if connErr := conn.CloseWrite(); connErr != nil {
-				logrus.Errorf("Unable to close conn: %v", connErr)
-			}
-		}
-		if streams.AttachOutput || streams.AttachError {
-			return <-receiveStdoutError
-		}
-	}
-	return nil
-}