106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package module
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import (
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"bytes"
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"fmt"
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"net/url"
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"os/exec"
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"regexp"
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"syscall"
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)
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// Getter defines the interface that schemes must implement to download
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// and update modules.
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type Getter interface {
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// Get downloads the given URL into the given directory. This always
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// assumes that we're updating and gets the latest version that it can.
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//
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// The directory may already exist (if we're updating). If it is in a
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// format that isn't understood, an error should be returned. Get shouldn't
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// simply nuke the directory.
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Get(string, *url.URL) error
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}
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// Getters is the mapping of scheme to the Getter implementation that will
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// be used to get a dependency.
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var Getters map[string]Getter
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// forcedRegexp is the regular expression that finds forced getters. This
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// syntax is schema::url, example: git::https://foo.com
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var forcedRegexp = regexp.MustCompile(`^([A-Za-z]+)::(.+)$`)
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func init() {
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Getters = map[string]Getter{
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"file": new(FileGetter),
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"git": new(GitGetter),
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"hg": new(HgGetter),
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}
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}
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// Get downloads the module specified by src into the folder specified by
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// dst. If dst already exists, Get will attempt to update it.
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//
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// src is a URL, whereas dst is always just a file path to a folder. This
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// folder doesn't need to exist. It will be created if it doesn't exist.
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func Get(dst, src string) error {
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var force string
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force, src = getForcedGetter(src)
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u, err := url.Parse(src)
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if err != nil {
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return err
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}
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if force == "" {
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force = u.Scheme
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}
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g, ok := Getters[force]
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if !ok {
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return fmt.Errorf(
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"module download not supported for scheme '%s'", force)
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}
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err = g.Get(dst, u)
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if err != nil {
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err = fmt.Errorf("error downloading module '%s': %s", src, err)
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}
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return err
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}
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// getRunCommand is a helper that will run a command and capture the output
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// in the case an error happens.
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func getRunCommand(cmd *exec.Cmd) error {
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var buf bytes.Buffer
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cmd.Stdout = &buf
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cmd.Stderr = &buf
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err := cmd.Run()
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if err == nil {
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return nil
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}
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if exiterr, ok := err.(*exec.ExitError); ok {
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// The program has exited with an exit code != 0
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if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
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return fmt.Errorf(
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"%s exited with %d: %s",
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cmd.Path,
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status.ExitStatus(),
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buf.String())
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}
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}
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return fmt.Errorf("error running %s: %s", cmd.Path, buf.String())
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}
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// getForcedGetter takes a source and returns the tuple of the forced
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// getter and the raw URL (without the force syntax).
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func getForcedGetter(src string) (string, string) {
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var forced string
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if ms := forcedRegexp.FindStringSubmatch(src); ms != nil {
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forced = ms[1]
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src = ms[2]
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}
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return forced, src
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}
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