constellation/cli/internal/cmd/miniup.go
Fabian Kammel 81a5907f26
consistently use stdout and stderr (#502)
* consistently use stdout and stderr
Signed-off-by: Fabian Kammel <fk@edgeless.systems>
2022-11-10 10:27:24 +01:00

296 lines
9.1 KiB
Go

/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package cmd
import (
"bufio"
"context"
"errors"
"fmt"
"io"
"net"
"net/http"
"os"
"runtime"
"strings"
"github.com/edgelesssys/constellation/v2/cli/internal/cloudcmd"
"github.com/edgelesssys/constellation/v2/cli/internal/libvirt"
"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
"github.com/edgelesssys/constellation/v2/internal/config"
"github.com/edgelesssys/constellation/v2/internal/constants"
"github.com/edgelesssys/constellation/v2/internal/file"
"github.com/edgelesssys/constellation/v2/internal/grpc/dialer"
"github.com/edgelesssys/constellation/v2/internal/license"
"github.com/edgelesssys/constellation/v2/internal/versions"
"github.com/schollz/progressbar/v3"
"github.com/spf13/afero"
"github.com/spf13/cobra"
"golang.org/x/sys/unix"
)
func newMiniUpCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "up",
Short: "Create and initialize a new MiniConstellation cluster",
Long: "Create and initialize a new MiniConstellation cluster.\n" +
"A mini cluster consists of a single control-plane and worker node, hosted using QEMU/KVM.\n",
Args: cobra.ExactArgs(0),
RunE: runUp,
}
// override global flag so we don't have a default value for the config
cmd.Flags().String("config", "", "path to the config file to use for the cluster")
return cmd
}
func runUp(cmd *cobra.Command, args []string) error {
spinner := newSpinner(cmd.ErrOrStderr())
defer spinner.Stop()
creator := cloudcmd.NewCreator(spinner)
return up(cmd, creator, spinner)
}
func up(cmd *cobra.Command, creator cloudCreator, spinner spinnerInterf) error {
if err := checkSystemRequirements(cmd.ErrOrStderr()); err != nil {
return fmt.Errorf("system requirements not met: %w", err)
}
fileHandler := file.NewHandler(afero.NewOsFs())
// create config if not passed as flag and set default values
config, err := prepareConfig(cmd, fileHandler)
if err != nil {
return fmt.Errorf("preparing config: %w", err)
}
// create cluster
spinner.Start("Creating cluster in QEMU ", false)
err = createMiniCluster(cmd.Context(), fileHandler, creator, config)
spinner.Stop()
if err != nil {
return fmt.Errorf("creating cluster: %w", err)
}
cmd.Println("Cluster successfully created.")
connectURI := config.Provider.QEMU.LibvirtURI
if connectURI == "" {
connectURI = libvirt.LibvirtTCPConnectURI
}
cmd.Println("Connect to the VMs by executing:")
cmd.Printf("\tvirsh -c %s\n\n", connectURI)
// initialize cluster
if err := initializeMiniCluster(cmd, fileHandler, spinner); err != nil {
return fmt.Errorf("initializing cluster: %w", err)
}
return nil
}
// checkSystemRequirements checks if the system meets the requirements for running a MiniConstellation cluster.
// We do so by verifying that the host:
// - arch/os is linux/amd64.
// - has access to /dev/kvm.
// - has at least 4 CPU cores.
// - has at least 4GB of memory.
// - has at least 20GB of free disk space.
func checkSystemRequirements(out io.Writer) error {
// check arch/os
if runtime.GOARCH != "amd64" || runtime.GOOS != "linux" {
return fmt.Errorf("creation of a QEMU based Constellation is not supported for %s/%s", runtime.GOOS, runtime.GOARCH)
}
// check if /dev/kvm exists
if _, err := os.Stat("/dev/kvm"); err != nil {
return fmt.Errorf("unable to access KVM device: %w", err)
}
// check CPU cores
if runtime.NumCPU() < 4 {
return fmt.Errorf("insufficient CPU cores: %d, at least 4 cores are required by MiniConstellation", runtime.NumCPU())
}
if runtime.NumCPU() < 6 {
fmt.Fprintf(out, "WARNING: Only %d CPU cores available. This may cause performance issues.\n", runtime.NumCPU())
}
// check memory
f, err := os.Open("/proc/meminfo")
if err != nil {
return fmt.Errorf("determining available memory: failed to open /proc/meminfo: %w", err)
}
defer f.Close()
var memKB int
scanner := bufio.NewScanner(f)
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), "MemTotal:") {
_, err = fmt.Sscanf(scanner.Text(), "MemTotal:%d", &memKB)
if err != nil {
return fmt.Errorf("determining available memory: failed to parse /proc/meminfo: %w", err)
}
}
}
memGB := memKB / 1024 / 1024
if memGB < 4 {
return fmt.Errorf("insufficient memory: %dGB, at least 4GB of memory are required by MiniConstellation", memGB)
}
if memGB < 6 {
fmt.Fprintln(out, "WARNING: Less than 6GB of memory available. This may cause performance issues.")
}
var stat unix.Statfs_t
if err := unix.Statfs(".", &stat); err != nil {
return err
}
freeSpaceGB := stat.Bavail * uint64(stat.Bsize) / 1024 / 1024 / 1024
if freeSpaceGB < 20 {
return fmt.Errorf("insufficient disk space: %dGB, at least 20GB of disk space are required by MiniConstellation", freeSpaceGB)
}
return nil
}
// prepareConfig reads a given config, or creates a new minimal QEMU config.
func prepareConfig(cmd *cobra.Command, fileHandler file.Handler) (*config.Config, error) {
configPath, err := cmd.Flags().GetString("config")
if err != nil {
return nil, err
}
// check for existing config
if configPath != "" {
config, err := readConfig(cmd.ErrOrStderr(), fileHandler, configPath)
if err != nil {
return nil, err
}
if config.GetProvider() != cloudprovider.QEMU {
return nil, errors.New("invalid provider for MiniConstellation cluster")
}
return config, nil
}
if err := cmd.Flags().Set("config", constants.ConfigFilename); err != nil {
return nil, err
}
_, err = fileHandler.Stat(constants.ConfigFilename)
if err == nil {
// config already exists, prompt user to overwrite
cmd.PrintErrln("A config file already exists in the current workspace.")
ok, err := askToConfirm(cmd, "Do you want to overwrite it?")
if err != nil {
return nil, err
}
if !ok {
return nil, errors.New("not overwriting existing config")
}
}
// download image to current directory if it doesn't exist
const imagePath = "./constellation.raw"
if _, err := os.Stat(imagePath); err == nil {
cmd.Printf("Using existing image at %s\n\n", imagePath)
} else if errors.Is(err, os.ErrNotExist) {
cmd.Printf("Downloading image to %s\n", imagePath)
if err := installImage(cmd.Context(), cmd.ErrOrStderr(), versions.ConstellationQEMUImageURL, imagePath); err != nil {
return nil, fmt.Errorf("downloading image to %s: %w", imagePath, err)
}
} else {
return nil, fmt.Errorf("checking if image exists: %w", err)
}
config := config.Default()
config.RemoveProviderExcept(cloudprovider.QEMU)
config.StateDiskSizeGB = 8
config.Provider.QEMU.Image = imagePath
return config, fileHandler.WriteYAML(constants.ConfigFilename, config, file.OptOverwrite)
}
// createMiniCluster creates a new cluster using the given config.
func createMiniCluster(ctx context.Context, fileHandler file.Handler, creator cloudCreator, config *config.Config) error {
idFile, err := creator.Create(ctx, cloudprovider.QEMU, config, "mini", "", 1, 1)
if err != nil {
return err
}
idFile.UID = "mini" // use UID "mini" to identify MiniConstellation clusters.
return fileHandler.WriteJSON(constants.ClusterIDsFileName, idFile, file.OptNone)
}
// initializeMiniCluster initializes a QEMU cluster.
func initializeMiniCluster(cmd *cobra.Command, fileHandler file.Handler, spinner spinnerInterf) (retErr error) {
// clean up cluster resources if initialization fails
defer func() {
if retErr != nil {
cmd.PrintErrf("An error occurred: %s\n", retErr)
cmd.PrintErrln("Attempting to roll back.")
_ = runDown(cmd, []string{})
cmd.PrintErrf("Rollback succeeded.\n\n")
}
}()
newDialer := func(validator *cloudcmd.Validator) *dialer.Dialer {
return dialer.New(nil, validator.V(cmd), &net.Dialer{})
}
cmd.Flags().String("master-secret", "", "")
cmd.Flags().String("endpoint", "", "")
cmd.Flags().Bool("conformance", false, "")
if err := initialize(cmd, newDialer, fileHandler, license.NewClient(), spinner); err != nil {
return err
}
return nil
}
// installImage downloads the image from sourceURL to the destination.
func installImage(ctx context.Context, errWriter io.Writer, sourceURL, destination string) error {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, sourceURL, nil)
if err != nil {
return fmt.Errorf("creating request: %w", err)
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return fmt.Errorf("downloading image: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("downloading image: %s", resp.Status)
}
f, err := os.OpenFile(destination, os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil {
return err
}
defer f.Close()
bar := progressbar.NewOptions64(
resp.ContentLength,
progressbar.OptionSetWriter(errWriter),
progressbar.OptionShowBytes(true),
progressbar.OptionSetPredictTime(true),
progressbar.OptionFullWidth(),
progressbar.OptionSetTheme(progressbar.Theme{
Saucer: "=",
SaucerHead: ">",
SaucerPadding: " ",
BarStart: "[",
BarEnd: "]",
}),
progressbar.OptionClearOnFinish(),
progressbar.OptionOnCompletion(func() { fmt.Fprintf(errWriter, "Done.\n\n") }),
)
defer bar.Close()
_, err = io.Copy(io.MultiWriter(f, bar), resp.Body)
if err != nil {
return err
}
return nil
}