libpod create and run

patched version of the same code that went into crio

Signed-off-by: baude <bbaude@redhat.com>

6 files changed, 465 insertions, 4 deletions

diff --git a/libpod/container.go b/libpod/container.go
index 1f5be9477..50fe18939 100644
--- a/libpod/container.go
+++ b/libpod/container.go
@@ -15,6 +15,9 @@ import (
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/ulule/deepcopier"
+	"github.com/docker/docker/pkg/term"
+	"k8s.io/client-go/tools/remotecommand"
+
 )
 
 // ContainerState represents the current state of a container
@@ -391,8 +394,32 @@ func (c *Container) Exec(cmd []string, tty bool, stdin bool) (string, error) {
 
 // Attach attaches to a container
 // Returns fully qualified URL of streaming server for the container
-func (c *Container) Attach(stdin, tty bool) (string, error) {
-	return "", ErrNotImplemented
+func (c *Container) Attach(noStdin bool, keys string) error {
+	// Check the validity of the provided keys first
+	var err error
+	detachKeys := []byte{}
+	if len(keys) > 0 {
+		detachKeys, err = term.ToBytes(keys)
+		if err != nil {
+			return errors.Wrapf(err, "invalid detach keys")
+		}
+	}
+	cStatus := c.state.State
+
+	if !(cStatus == ContainerStateRunning || cStatus == ContainerStateCreated) {
+		return errors.Errorf("%s is not created or running", c.Name())
+	}
+	resize := make(chan remotecommand.TerminalSize)
+	defer close(resize)
+	err = c.attachContainerSocket(resize, noStdin, detachKeys)
+	if err != nil {
+		return err
+	}
+	// TODO
+	// Re-enable this when mheon is done wth it
+	//c.ContainerStateToDisk(c)
+
+	return nil
 }
 
 // Mount mounts a container's filesystem on the host
diff --git a/libpod/container_attach.go b/libpod/container_attach.go
new file mode 100644
index 000000000..b2a407027
--- /dev/null
+++ b/libpod/container_attach.go
@@ -0,0 +1,142 @@
+package libpod
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	"github.com/docker/docker/pkg/term"
+	"github.com/kubernetes-incubator/cri-o/utils"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"golang.org/x/sys/unix"
+	"k8s.io/client-go/tools/remotecommand"
+	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+)
+
+/* Sync with stdpipe_t in conmon.c */
+const (
+	AttachPipeStdin  = 1
+	AttachPipeStdout = 2
+	AttachPipeStderr = 3
+)
+
+// attachContainerSocket connects to the container's attach socket and deals with the IO
+func (c *Container) attachContainerSocket(resize <-chan remotecommand.TerminalSize, noStdIn bool, detachKeys []byte) error {
+	inputStream := os.Stdin
+	outputStream := os.Stdout
+	errorStream := os.Stderr
+	defer inputStream.Close()
+	tty, err := strconv.ParseBool(c.runningSpec.Annotations["io.kubernetes.cri-o.TTY"])
+	if err != nil {
+		return errors.Wrapf(err, "unable to parse annotations in %s", c.ID)
+	}
+	if !tty {
+		return errors.Errorf("no tty available for %s", c.ID())
+	}
+
+	oldTermState, err := term.SaveState(inputStream.Fd())
+	if err != nil {
+		return errors.Wrapf(err, "unable to save terminal state")
+	}
+
+	defer term.RestoreTerminal(inputStream.Fd(), oldTermState)
+
+	// Put both input and output into raw
+	if !noStdIn {
+		term.SetRawTerminal(inputStream.Fd())
+	}
+
+	controlPath := filepath.Join(c.state.RunDir, "ctl")
+	controlFile, err := os.OpenFile(controlPath, unix.O_WRONLY, 0)
+	if err != nil {
+		return errors.Wrapf(err, "failed to open container ctl file: %v")
+	}
+
+	kubecontainer.HandleResizing(resize, func(size remotecommand.TerminalSize) {
+		logrus.Debugf("Received a resize event: %+v", size)
+		_, err := fmt.Fprintf(controlFile, "%d %d %d\n", 1, size.Height, size.Width)
+		if err != nil {
+			logrus.Warnf("Failed to write to control file to resize terminal: %v", err)
+		}
+	})
+	logrus.Debug("connecting to socket ", c.attachSocketPath())
+
+	conn, err := net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: c.attachSocketPath(), Net: "unixpacket"})
+	if err != nil {
+		return errors.Wrapf(err, "failed to connect to container's attach socket: %v")
+	}
+	defer conn.Close()
+
+	receiveStdoutError := make(chan error)
+	if outputStream != nil || errorStream != nil {
+		go func() {
+			receiveStdoutError <- redirectResponseToOutputStreams(outputStream, errorStream, conn)
+		}()
+	}
+
+	stdinDone := make(chan error)
+	go func() {
+		var err error
+		if inputStream != nil && !noStdIn {
+			_, err = utils.CopyDetachable(conn, inputStream, detachKeys)
+			conn.CloseWrite()
+		}
+		stdinDone <- err
+	}()
+
+	select {
+	case err := <-receiveStdoutError:
+		return err
+	case err := <-stdinDone:
+		if _, ok := err.(utils.DetachError); ok {
+			return nil
+		}
+		if outputStream != nil || errorStream != nil {
+			return <-receiveStdoutError
+		}
+	}
+	return nil
+}
+
+func redirectResponseToOutputStreams(outputStream, errorStream io.Writer, 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
+			switch buf[0] {
+			case AttachPipeStdout:
+				dst = outputStream
+			case AttachPipeStderr:
+				dst = errorStream
+			default:
+				logrus.Infof("Received unexpected attach type %+d", buf[0])
+			}
+
+			if dst != nil {
+				nw, ew := dst.Write(buf[1:nr])
+				if ew != nil {
+					err = ew
+					break
+				}
+				if nr != nw+1 {
+					err = io.ErrShortWrite
+					break
+				}
+			}
+		}
+		if er == io.EOF {
+			break
+		}
+		if er != nil {
+			err = er
+			break
+		}
+	}
+	return err
+}
diff --git a/libpod/runtime_ctr.go b/libpod/runtime_ctr.go
index 45990d2db..a1351e1d7 100644
--- a/libpod/runtime_ctr.go
+++ b/libpod/runtime_ctr.go
@@ -22,7 +22,6 @@ type ContainerFilter func(*Container) bool
 func (r *Runtime) NewContainer(spec *spec.Spec, options ...CtrCreateOption) (ctr *Container, err error) {
 	r.lock.Lock()
 	defer r.lock.Unlock()
-
 	if !r.valid {
 		return nil, ErrRuntimeStopped
 	}
diff --git a/libpod/runtime_img.go b/libpod/runtime_img.go
index 278f0c186..a058380a1 100644
--- a/libpod/runtime_img.go
+++ b/libpod/runtime_img.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"net"
 	"os"
 	"strings"
 	"syscall"
@@ -46,6 +47,8 @@ var (
 	// DirTransport is the transport for pushing and pulling
 	// images to and from a directory
 	DirTransport = "dir"
+	// TransportNames are the supported transports in string form
+	TransportNames = [...]string{DefaultRegistry, DockerArchive, OCIArchive, "ostree:", "dir:"}
 )
 
 // CopyOptions contains the options given when pushing or pulling images
@@ -94,6 +97,262 @@ type imageDecomposeStruct struct {
 	transport   string
 }
 
+func (k *Image) assembleFqName() string {
+	return fmt.Sprintf("%s/%s:%s", k.Registry, k.ImageName, k.Tag)
+}
+
+func (k *Image) assembleFqNameTransport() string {
+	return fmt.Sprintf("%s%s/%s:%s", k.Transport, k.Registry, k.ImageName, k.Tag)
+}
+
+//Image describes basic attributes of an image
+type Image struct {
+	Name           string
+	ID             string
+	fqname         string
+	hasImageLocal  bool
+	runtime        *Runtime
+	Registry       string
+	ImageName      string
+	Tag            string
+	HasRegistry    bool
+	Transport      string
+	beenDecomposed bool
+	PullName       string
+}
+
+// NewImage creates a new image object based on its name
+func (r *Runtime) NewImage(name string) Image {
+	return Image{
+		Name:    name,
+		runtime: r,
+	}
+}
+
+// GetImageID returns the image ID of the image
+func (k *Image) GetImageID() (string, error) {
+	if k.ID != "" {
+		return k.ID, nil
+	}
+	image, _ := k.GetFQName()
+	img, err := k.runtime.GetImage(image)
+	if err != nil {
+		return "", err
+	}
+	return img.ID, nil
+}
+
+// GetFQName returns the fully qualified image name if it can be determined
+func (k *Image) GetFQName() (string, error) {
+	// Check if the fqname has already been found
+	if k.fqname != "" {
+		return k.fqname, nil
+	}
+	if err := k.Decompose(); err != nil {
+		return "", err
+	}
+	k.fqname = k.assembleFqName()
+	return k.fqname, nil
+}
+
+func (k *Image) findImageOnRegistry() error {
+	searchRegistries, err := GetRegistries()
+
+	if err != nil {
+		return errors.Wrapf(err, " the image name '%s' is incomplete.", k.Name)
+	}
+
+	for _, searchRegistry := range searchRegistries {
+		k.Registry = searchRegistry
+		err = k.GetManifest()
+		if err == nil {
+			k.fqname = k.assembleFqName()
+			return nil
+
+		}
+	}
+	return errors.Errorf("unable to find image on any configured registries")
+
+}
+
+// GetManifest tries to GET an images manifest, returns nil on success and err on failure
+func (k *Image) GetManifest() error {
+	pullRef, err := alltransports.ParseImageName(k.assembleFqNameTransport())
+	if err != nil {
+		return errors.Errorf("unable to parse1 '%s'", k.assembleFqName())
+	}
+	imageSource, err := pullRef.NewImageSource(nil)
+	if err != nil {
+		return errors.Wrapf(err, "unable to create new image source")
+	}
+	_, _, err = imageSource.GetManifest()
+	if err == nil {
+		return nil
+	}
+	return err
+}
+
+//Decompose breaks up an image name into its parts
+func (k *Image) Decompose() error {
+	if k.beenDecomposed {
+		return nil
+	}
+	k.beenDecomposed = true
+	k.Transport = "docker://"
+	decomposeName := k.Name
+	for _, transport := range TransportNames {
+		if strings.HasPrefix(k.Name, transport) {
+			k.Transport = transport
+			decomposeName = strings.Replace(k.Name, transport, "", -1)
+			break
+		}
+	}
+	if k.Transport == "dir:" {
+		return nil
+	}
+	var imageError = fmt.Sprintf("unable to parse '%s'\n", decomposeName)
+	imgRef, err := reference.Parse(decomposeName)
+	if err != nil {
+		return errors.Wrapf(err, imageError)
+	}
+	tagged, isTagged := imgRef.(reference.NamedTagged)
+	k.Tag = "latest"
+	if isTagged {
+		k.Tag = tagged.Tag()
+	}
+	k.HasRegistry = true
+	registry := reference.Domain(imgRef.(reference.Named))
+	if registry == "" {
+		k.HasRegistry = false
+	}
+	k.ImageName = reference.Path(imgRef.(reference.Named))
+
+	// account for image names with directories in them like
+	// umohnani/get-started:part1
+	if k.HasRegistry {
+		k.Registry = registry
+		k.fqname = k.assembleFqName()
+		k.PullName = k.assembleFqName()
+
+		registries, err := getRegistries()
+		if err != nil {
+			return nil
+		}
+		if StringInSlice(k.Registry, registries) {
+			return nil
+		}
+		// We need to check if the registry name is legit
+		_, err = net.LookupAddr(k.Registry)
+		if err == nil {
+			return nil
+		}
+		// Combine the Registry and Image Name together and blank out the Registry Name
+		k.ImageName = fmt.Sprintf("%s/%s", k.Registry, k.ImageName)
+		k.Registry = ""
+
+	}
+	// No Registry means we check the globals registries configuration file
+	// and assemble a list of candidate sources to try
+	//searchRegistries, err := GetRegistries()
+	err = k.findImageOnRegistry()
+	k.PullName = k.assembleFqName()
+	if err != nil {
+		return errors.Wrapf(err, " the image name '%s' is incomplete.", k.Name)
+	}
+	return nil
+}
+
+// HasImageLocal returns a bool true if the image is already pulled
+func (k *Image) HasImageLocal() bool {
+	_, err := k.runtime.GetImage(k.Name)
+	if err == nil {
+		return true
+	}
+	fqname, _ := k.GetFQName()
+
+	_, err = k.runtime.GetImage(fqname)
+	if err == nil {
+		return true
+	}
+	return false
+}
+
+// HasLatest determines if we have the latest image local
+func (k *Image) HasLatest() (bool, error) {
+	if !k.HasImageLocal() {
+		return false, nil
+	}
+	fqname, err := k.GetFQName()
+	if err != nil {
+		return false, err
+	}
+	pullRef, err := alltransports.ParseImageName(fqname)
+	if err != nil {
+		return false, err
+	}
+	_, _, err = pullRef.(types.ImageSource).GetManifest()
+	if err != nil {
+		return false, err
+	}
+	return false, nil
+}
+
+// Pull is a wrapper function to pull and image
+func (k *Image) Pull() error {
+	// If the image hasn't been decomposed yet
+	if !k.beenDecomposed {
+		err := k.Decompose()
+		if err != nil {
+			return err
+		}
+	}
+	k.runtime.PullImage(k.PullName, CopyOptions{Writer: os.Stdout, SignaturePolicyPath: k.runtime.config.SignaturePolicyPath})
+	return nil
+}
+
+// GetRegistries gets the searchable registries from the global registration file.
+func GetRegistries() ([]string, error) {
+	registryConfigPath := ""
+	envOverride := os.Getenv("REGISTRIES_CONFIG_PATH")
+	if len(envOverride) > 0 {
+		registryConfigPath = envOverride
+	}
+	searchRegistries, err := sysregistries.GetRegistries(&types.SystemContext{SystemRegistriesConfPath: registryConfigPath})
+	if err != nil {
+		return nil, errors.Errorf("unable to parse the registries.conf file")
+	}
+	return searchRegistries, nil
+}
+
+// GetInsecureRegistries obtains the list of inseure registries from the global registration file.
+func GetInsecureRegistries() ([]string, error) {
+	registryConfigPath := ""
+	envOverride := os.Getenv("REGISTRIES_CONFIG_PATH")
+	if len(envOverride) > 0 {
+		registryConfigPath = envOverride
+	}
+	registries, err := sysregistries.GetInsecureRegistries(&types.SystemContext{SystemRegistriesConfPath: registryConfigPath})
+	if err != nil {
+		return nil, errors.Errorf("unable to parse the registries.conf file")
+	}
+	return registries, nil
+}
+
+// getRegistries returns both searchable and insecure registries from the global conf file.
+func getRegistries() ([]string, error) {
+	var r []string
+	registries, err := GetRegistries()
+	if err != nil {
+		return r, err
+	}
+	insecureRegistries, err := GetInsecureRegistries()
+	if err != nil {
+		return r, err
+	}
+	r = append(registries, insecureRegistries...)
+	return r, nil
+}
+
 // ImageFilter is a function to determine whether an image is included in
 // command output. Images to be outputted are tested using the function. A true
 // return will include the image, a false return will exclude it.
diff --git a/libpod/storage.go b/libpod/storage.go
index f0bf9e9cd..5e18aaf5c 100644
--- a/libpod/storage.go
+++ b/libpod/storage.go
@@ -57,7 +57,7 @@ func (metadata *RuntimeContainerMetadata) SetMountLabel(mountLabel string) {
 }
 
 // CreateContainerStorage creates the storage end of things.  We already have the container spec created
-// TO-DO We should be passing in an KpodImage object in the future.
+// TO-DO We should be passing in an Image object in the future.
 func (r *storageService) CreateContainerStorage(systemContext *types.SystemContext, imageName, imageID, containerName, containerID, mountLabel string) (ContainerInfo, error) {
 	var ref types.ImageReference
 	if imageName == "" && imageID == "" {
diff --git a/libpod/util.go b/libpod/util.go
new file mode 100644
index 000000000..0270af07c
--- /dev/null
+++ b/libpod/util.go
@@ -0,0 +1,34 @@
+package libpod
+
+import (
+	"os"
+	"path/filepath"
+)
+
+// WriteFile writes a provided string to a provided path
+func WriteFile(content string, path string) error {
+	baseDir := filepath.Dir(path)
+	if baseDir != "" {
+		if _, err := os.Stat(path); err != nil {
+			return err
+		}
+	}
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	f.WriteString(content)
+	f.Sync()
+	return nil
+}
+
+// StringInSlice determines if a string is in a string slice, returns bool
+func StringInSlice(s string, sl []string) bool {
+	for _, i := range sl {
+		if i == s {
+			return true
+		}
+	}
+	return false
+}