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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// vespa clone command
// author: bratseth
package cmd
import (
"archive/zip"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"github.com/fatih/color"
"github.com/spf13/cobra"
)
func newCloneCmd(cli *CLI) *cobra.Command {
var (
listApps bool
forceClone bool
)
cmd := &cobra.Command{
Use: "clone sample-application-path target-directory",
Short: "Create files and directory structure for a new Vespa application from a sample application",
Long: `Create files and directory structure for a new Vespa application
from a sample application.
Sample applications are downloaded from
https://github.com/vespa-engine/sample-apps.
By default sample applications are cached in the user's cache directory. This
directory can be overriden by setting the VESPA_CLI_CACHE_DIR environment
variable.`,
Example: "$ vespa clone vespa-cloud/album-recommendation my-app",
DisableAutoGenTag: true,
SilenceUsage: true,
RunE: func(cmd *cobra.Command, args []string) error {
if listApps {
apps, err := listSampleApps(cli.httpClient)
if err != nil {
return fmt.Errorf("could not list sample applications: %w", err)
}
for _, app := range apps {
log.Print(app)
}
return nil
}
if len(args) != 2 {
return fmt.Errorf("expected exactly 2 arguments, got %d", len(args))
}
return cloneApplication(cli, args[0], args[1], forceClone)
},
}
cmd.Flags().BoolVarP(&listApps, "list", "l", false, "List available sample applications")
cmd.Flags().BoolVarP(&forceClone, "force", "f", false, "Ignore cache and force downloading the latest sample application from GitHub")
return cmd
}
func cloneApplication(cli *CLI, applicationName string, applicationDir string, force bool) error {
zipFile, err := openSampleAppsZip(force, cli)
if err != nil {
return err
}
defer zipFile.Close()
r, err := zip.OpenReader(zipFile.Name())
if err != nil {
return fmt.Errorf("could not open sample apps zip '%s': %w", color.CyanString(zipFile.Name()), err)
}
defer r.Close()
found := false
for _, f := range r.File {
dirPrefix := "sample-apps-master/" + applicationName + "/"
if strings.HasPrefix(f.Name, dirPrefix) {
if !found { // Create destination directory lazily when source is found
createErr := os.Mkdir(applicationDir, 0755)
if createErr != nil {
return fmt.Errorf("could not create directory '%s': %w", color.CyanString(applicationDir), createErr)
}
}
found = true
if err := copy(f, applicationDir, dirPrefix); err != nil {
return fmt.Errorf("could not copy zip entry '%s': %w", color.CyanString(f.Name), err)
}
}
}
if !found {
return errHint(fmt.Errorf("could not find source application '%s'", color.CyanString(applicationName)), "Use -f to ignore the cache")
} else {
log.Print("Created ", color.CyanString(applicationDir))
}
return nil
}
func useCache(force bool, stat os.FileInfo) (bool, error) {
if force {
return false, nil
}
expiry := stat.ModTime().Add(time.Hour * 168) // 1 week
return stat.Size() > 0 && time.Now().Before(expiry), nil
}
func fetchSampleAppsZip(destination string, cli *CLI) error {
f, err := ioutil.TempFile(filepath.Dir(destination), "sample-apps")
if err != nil {
return fmt.Errorf("could not create temporary file: %w", err)
}
defer f.Close()
return cli.spinner(cli.Stderr, color.YellowString("Downloading sample apps ..."), func() error {
request, err := http.NewRequest("GET", "https://github.com/vespa-engine/sample-apps/archive/refs/heads/master.zip", nil)
if err != nil {
return fmt.Errorf("invalid url: %w", err)
}
response, err := cli.httpClient.Do(request, time.Minute*60)
if err != nil {
return fmt.Errorf("could not download sample apps: %w", err)
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return fmt.Errorf("could not download sample apps: github returned status %d", response.StatusCode)
}
if _, err := io.Copy(f, response.Body); err != nil {
return fmt.Errorf("could not write sample apps to file: %s: %w", f.Name(), err)
}
f.Close()
if err := os.Rename(f.Name(), destination); err != nil {
return fmt.Errorf("could not move sample apps to cache path")
}
return nil
})
}
func openSampleAppsZip(forceClone bool, cli *CLI) (*os.File, error) {
cacheDir, err := vespaCliCacheDir(cli.Environment)
if err != nil {
return nil, err
}
path := filepath.Join(cacheDir, "sample-apps-master.zip")
cacheExists := true
stat, err := os.Stat(path)
if errors.Is(err, os.ErrNotExist) {
cacheExists = false
} else if err != nil {
return nil, fmt.Errorf("could not stat existing cache file: %w", err)
}
if cacheExists {
useCache, err := useCache(forceClone, stat)
if err != nil {
return nil, errHint(fmt.Errorf("could not determine cache status: %w", err), "Try ignoring the cache with the -f flag")
}
if useCache {
log.Print(color.YellowString("Using cached sample apps ..."))
return os.Open(path)
}
}
if err := fetchSampleAppsZip(path, cli); err != nil {
return nil, fmt.Errorf("could not fetch sample apps: %w", err)
}
return os.Open(path)
}
func copy(f *zip.File, destinationDir string, zipEntryPrefix string) error {
destinationPath := filepath.Join(destinationDir, filepath.FromSlash(strings.TrimPrefix(f.Name, zipEntryPrefix)))
if strings.HasSuffix(f.Name, "/") {
if f.Name != zipEntryPrefix { // root is already created
if err := os.Mkdir(destinationPath, 0755); err != nil {
return err
}
}
} else {
r, err := f.Open()
if err != nil {
return err
}
defer r.Close()
destination, err := os.Create(destinationPath)
if err != nil {
return err
}
if _, err := io.Copy(destination, r); err != nil {
return err
}
if err := os.Chmod(destinationPath, f.Mode()); err != nil {
return err
}
}
return nil
}
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