podman machine init user input

users may now provide a fully qualified local file path or a URL to seed
the disk-image to be used in the VM.

[NO TESTS NEEDED]

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

3 files changed, 180 insertions, 51 deletions

diff --git a/pkg/machine/fcos.go b/pkg/machine/fcos.go
index 0c6a2485e..32f943c87 100644
--- a/pkg/machine/fcos.go
+++ b/pkg/machine/fcos.go
@@ -2,17 +2,13 @@ package machine
 
 import (
 	"crypto/sha256"
-	"io"
 	"io/ioutil"
 	url2 "net/url"
-	"os"
 	"path/filepath"
 	"runtime"
 	"strings"
 
-	"github.com/containers/storage/pkg/archive"
 	digest "github.com/opencontainers/go-digest"
-	"github.com/sirupsen/logrus"
 )
 
 // These should eventually be moved into machine/qemu as
@@ -75,41 +71,7 @@ func (f FcosDownload) DownloadImage() error {
 			return err
 		}
 	}
-	uncompressedFileWriter, err := os.OpenFile(f.getLocalUncompressedName(), os.O_CREATE|os.O_RDWR, 0600)
-	if err != nil {
-		return err
-	}
-	sourceFile, err := ioutil.ReadFile(f.LocalPath)
-	if err != nil {
-		return err
-	}
-	compressionType := archive.DetectCompression(sourceFile)
-	f.CompressionType = compressionType.Extension()
-
-	switch f.CompressionType {
-	case "tar.xz":
-		return decompressXZ(f.LocalPath, uncompressedFileWriter)
-	default:
-		// File seems to be uncompressed, make a copy
-		if err := copyFile(f.LocalPath, uncompressedFileWriter); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func copyFile(src string, dest *os.File) error {
-	source, err := os.Open(src)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		if err := source.Close(); err != nil {
-			logrus.Error(err)
-		}
-	}()
-	_, err = io.Copy(dest, source)
-	return err
+	return Decompress(f.LocalPath, f.getLocalUncompressedName())
 }
 
 func (f FcosDownload) Get() *Download {
diff --git a/pkg/machine/pull.go b/pkg/machine/pull.go
index 39dde15b8..d719d2e6d 100644
--- a/pkg/machine/pull.go
+++ b/pkg/machine/pull.go
@@ -3,17 +3,94 @@ package machine
 import (
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net/http"
+	url2 "net/url"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
 	"time"
 
+	"github.com/containers/image/v5/pkg/compression"
+	"github.com/docker/docker/pkg/archive"
 	"github.com/sirupsen/logrus"
 	"github.com/vbauerster/mpb/v6"
 	"github.com/vbauerster/mpb/v6/decor"
 )
 
+// GenericDownload is used when a user provides a URL
+// or path for an image
+type GenericDownload struct {
+	Download
+}
+
+// NewGenericDownloader is used when the disk image is provided by the user
+func NewGenericDownloader(vmType, vmName, pullPath string) (DistributionDownload, error) {
+	var (
+		imageName string
+	)
+	dataDir, err := GetDataDir(vmType)
+	if err != nil {
+		return nil, err
+	}
+	dl := Download{}
+	// Is pullpath a file or url?
+	getURL, err := url2.Parse(pullPath)
+	if err != nil {
+		return nil, err
+	}
+	if len(getURL.Scheme) > 0 {
+		urlSplit := strings.Split(pullPath, "/")
+		imageName = urlSplit[len(urlSplit)-1]
+		dl.LocalUncompressedFile = filepath.Join(dataDir, imageName)
+		dl.URL = getURL
+		dl.LocalPath = filepath.Join(dataDir, imageName)
+	} else {
+		// Dealing with FilePath
+		imageName = filepath.Base(pullPath)
+		dl.LocalUncompressedFile = filepath.Join(dataDir, imageName)
+		dl.LocalPath = pullPath
+	}
+	dl.VMName = vmName
+	dl.ImageName = imageName
+	// The download needs to be pulled into the datadir
+
+	gd := GenericDownload{Download: dl}
+	gd.LocalUncompressedFile = gd.getLocalUncompressedName()
+	return gd, nil
+}
+
+func (g GenericDownload) getLocalUncompressedName() string {
+	var (
+		extension string
+	)
+	switch {
+	case strings.HasSuffix(g.LocalPath, ".bz2"):
+		extension = ".bz2"
+	case strings.HasSuffix(g.LocalPath, ".gz"):
+		extension = ".gz"
+	case strings.HasSuffix(g.LocalPath, ".xz"):
+		extension = ".xz"
+	}
+	uncompressedFilename := filepath.Join(filepath.Dir(g.LocalUncompressedFile), g.VMName+"_"+g.ImageName)
+	return strings.TrimSuffix(uncompressedFilename, extension)
+}
+
+func (g GenericDownload) DownloadImage() error {
+	// If we have a URL for this "downloader", we now pull it
+	if g.URL != nil {
+		if err := DownloadVMImage(g.URL, g.LocalPath); err != nil {
+			return err
+		}
+	}
+	return Decompress(g.LocalPath, g.getLocalUncompressedName())
+}
+
+func (g GenericDownload) Get() *Download {
+	return &g.Download
+}
+
 // DownloadVMImage downloads a VM image from url to given path
 // with download status
 func DownloadVMImage(downloadURL fmt.Stringer, localImagePath string) error {
@@ -75,6 +152,22 @@ func DownloadVMImage(downloadURL fmt.Stringer, localImagePath string) error {
 	return nil
 }
 
+func Decompress(localPath, uncompressedPath string) error {
+	uncompressedFileWriter, err := os.OpenFile(uncompressedPath, os.O_CREATE|os.O_RDWR, 0600)
+	if err != nil {
+		return err
+	}
+	sourceFile, err := ioutil.ReadFile(localPath)
+	if err != nil {
+		return err
+	}
+
+	if compressionType := archive.DetectCompression(sourceFile); compressionType.Extension() == "tar.xz" {
+		return decompressXZ(localPath, uncompressedFileWriter)
+	}
+	return decompressEverythingElse(localPath, uncompressedFileWriter)
+}
+
 // Will error out if file without .xz already exists
 // Maybe extracting then renameing is a good idea here..
 // depends on xz: not pre-installed on mac, so it becomes a brew dependecy
@@ -95,3 +188,23 @@ func decompressXZ(src string, output io.Writer) error {
 	}()
 	return cmd.Run()
 }
+
+func decompressEverythingElse(src string, output io.Writer) error {
+	fmt.Println("Extracting compressed file")
+	f, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	uncompressStream, _, err := compression.AutoDecompress(f)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err := uncompressStream.Close(); err != nil {
+			logrus.Error(err)
+		}
+	}()
+
+	_, err = io.Copy(output, uncompressStream)
+	return err
+}
diff --git a/pkg/machine/qemu/machine.go b/pkg/machine/qemu/machine.go
index fe155750f..652a077cc 100644
--- a/pkg/machine/qemu/machine.go
+++ b/pkg/machine/qemu/machine.go
@@ -12,9 +12,8 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/containers/podman/v3/utils"
-
 	"github.com/containers/podman/v3/pkg/machine"
+	"github.com/containers/podman/v3/utils"
 	"github.com/containers/storage/pkg/homedir"
 	"github.com/digitalocean/go-qemu/qmp"
 	"github.com/pkg/errors"
@@ -135,15 +134,29 @@ func (v *MachineVM) Init(opts machine.InitOptions) error {
 	jsonFile := filepath.Join(vmConfigDir, v.Name) + ".json"
 	v.IdentityPath = filepath.Join(sshDir, v.Name)
 
-	dd, err := machine.NewFcosDownloader(vmtype, v.Name)
-	if err != nil {
-		return err
+	// The user has provided an alternate image which can be a file path
+	// or URL.
+	if len(opts.ImagePath) > 0 {
+		g, err := machine.NewGenericDownloader(vmtype, v.Name, opts.ImagePath)
+		if err != nil {
+			return err
+		}
+		v.ImagePath = g.Get().LocalUncompressedFile
+		if err := g.DownloadImage(); err != nil {
+			return err
+		}
+	} else {
+		// Get the image as usual
+		dd, err := machine.NewFcosDownloader(vmtype, v.Name)
+		if err != nil {
+			return err
+		}
+		v.ImagePath = dd.Get().LocalUncompressedFile
+		if err := dd.DownloadImage(); err != nil {
+			return err
+		}
 	}
 
-	v.ImagePath = dd.Get().LocalUncompressedFile
-	if err := dd.DownloadImage(); err != nil {
-		return err
-	}
 	// Add arch specific options including image location
 	v.CmdLine = append(v.CmdLine, v.addArchOptions()...)
 
@@ -171,10 +184,20 @@ func (v *MachineVM) Init(opts machine.InitOptions) error {
 		return err
 	}
 
+	originalDiskSize, err := getDiskSize(v.ImagePath)
+	if err != nil {
+		return err
+	}
 	// Resize the disk image to input disk size
-	resize := exec.Command("qemu-img", []string{"resize", v.ImagePath, strconv.Itoa(int(opts.DiskSize)) + "G"}...)
-	if err := resize.Run(); err != nil {
-		return errors.Errorf("error resizing image: %q", err)
+	// only if the virtualdisk size is less than
+	// the given disk size
+	if opts.DiskSize<<(10*3) > originalDiskSize {
+		resize := exec.Command("qemu-img", []string{"resize", v.ImagePath, strconv.Itoa(int(opts.DiskSize)) + "G"}...)
+		resize.Stdout = os.Stdout
+		resize.Stderr = os.Stderr
+		if err := resize.Run(); err != nil {
+			return errors.Errorf("error resizing image: %q", err)
+		}
 	}
 	// Write the ignition file
 	ign := machine.DynamicIgnition{
@@ -372,3 +395,34 @@ func (v *MachineVM) SSH(name string, opts machine.SSHOptions) error {
 
 	return cmd.Run()
 }
+
+// executes qemu-image info to get the virtual disk size
+// of the diskimage
+func getDiskSize(path string) (uint64, error) {
+	diskInfo := exec.Command("qemu-img", "info", "--output", "json", path)
+	stdout, err := diskInfo.StdoutPipe()
+	if err != nil {
+		return 0, err
+	}
+	if err := diskInfo.Start(); err != nil {
+		return 0, err
+	}
+	tmpInfo := struct {
+		VirtualSize    uint64 `json:"virtual-size"`
+		Filename       string `json:"filename"`
+		ClusterSize    int64  `json:"cluster-size"`
+		Format         string `json:"format"`
+		FormatSpecific struct {
+			Type string            `json:"type"`
+			Data map[string]string `json:"data"`
+		}
+		DirtyFlag bool `json:"dirty-flag"`
+	}{}
+	if err := json.NewDecoder(stdout).Decode(&tmpInfo); err != nil {
+		return 0, err
+	}
+	if err := diskInfo.Wait(); err != nil {
+		return 0, err
+	}
+	return tmpInfo.VirtualSize, nil
+}