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110 lines
2.5 KiB
110 lines
2.5 KiB
package main
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import (
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"strings"
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"github.com/kubernetes/helm/pkg/chart"
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"github.com/kubernetes/helm/pkg/repo"
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"github.com/spf13/cobra"
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)
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func init() {
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RootCommand.AddCommand(fetchCmd)
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}
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var fetchCmd = &cobra.Command{
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Use: "fetch [chart URL | repo/chartname]",
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Short: "Download a chart from a repository and (optionally) unpack it in local directory.",
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Long: "",
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RunE: fetch,
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}
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func fetch(cmd *cobra.Command, args []string) error {
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if len(args) == 0 {
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return fmt.Errorf("This command needs at least one argument, url or repo/name of the chart.")
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}
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f, err := repo.LoadRepositoriesFile(repositoriesFile())
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if err != nil {
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return err
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}
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// get download url
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u, err := mapRepoArg(args[0], f.Repositories)
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if err != nil {
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return err
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}
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resp, err := http.Get(u.String())
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if err != nil {
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return err
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}
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if resp.StatusCode != 200 {
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return fmt.Errorf("Failed to fetch %s : %s", u.String(), resp.Status)
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}
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defer resp.Body.Close()
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// TODO(vaikas): Implement untar / flag
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untar := false
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if untar {
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return untarChart(resp.Body)
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}
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p := strings.Split(u.String(), "/")
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return saveChartFile(p[len(p)-1], resp.Body)
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}
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// mapRepoArg figures out which format the argument is given, and creates a fetchable
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// url from it.
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func mapRepoArg(arg string, r map[string]string) (*url.URL, error) {
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// See if it's already a full URL.
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u, err := url.ParseRequestURI(arg)
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if err == nil {
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// If it has a scheme and host and path, it's a full URL
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if u.IsAbs() && len(u.Host) > 0 && len(u.Path) > 0 {
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return u, nil
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}
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return nil, fmt.Errorf("Invalid chart url format: %s", arg)
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}
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// See if it's of the form: repo/path_to_chart
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p := strings.Split(arg, "/")
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if len(p) > 1 {
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if baseURL, ok := r[p[0]]; ok {
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if !strings.HasSuffix(baseURL, "/") {
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baseURL = baseURL + "/"
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}
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return url.ParseRequestURI(baseURL + strings.Join(p[1:], "/"))
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}
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return nil, fmt.Errorf("No such repo: %s", p[0])
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}
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return nil, fmt.Errorf("Invalid chart url format: %s", arg)
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}
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func untarChart(r io.Reader) error {
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c, err := chart.LoadDataFromReader(r)
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if err != nil {
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return err
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}
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if c == nil {
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return fmt.Errorf("Failed to untar the chart")
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}
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return fmt.Errorf("Not implemented yee")
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}
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func saveChartFile(c string, r io.Reader) error {
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// Grab the chart name that we'll use for the name of the file to download to.
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out, err := os.Create(c)
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if err != nil {
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return err
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}
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defer out.Close()
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_, err = io.Copy(out, r)
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return err
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}
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