54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
|
package module
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"net/url"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Getter defines the interface that schemes must implement to download
|
||
|
|
// and update modules.
|
||
|
|
type Getter interface {
|
||
|
|
// Get downloads the given URL into the given directory. This always
|
||
|
|
// assumes that we're updating and gets the latest version that it can.
|
||
|
|
//
|
||
|
|
// The directory may already exist (if we're updating). If it is in a
|
||
|
|
// format that isn't understood, an error should be returned. Get shouldn't
|
||
|
|
// simply nuke the directory.
|
||
|
|
Get(string, *url.URL) error
|
||
|
|
}
|
||
|
|
|
||
|
|
// Getters is the mapping of scheme to the Getter implementation that will
|
||
|
|
// be used to get a dependency.
|
||
|
|
var Getters map[string]Getter
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
Getters = map[string]Getter{
|
||
|
|
"file": new(FileGetter),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get downloads the module specified by src into the folder specified by
|
||
|
|
// dst. If dst already exists, Get will attempt to update it.
|
||
|
|
//
|
||
|
|
// src is a URL, whereas dst is always just a file path to a folder. This
|
||
|
|
// folder doesn't need to exist. It will be created if it doesn't exist.
|
||
|
|
func Get(dst, src string) error {
|
||
|
|
u, err := url.Parse(src)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
g, ok := Getters[u.Scheme]
|
||
|
|
if !ok {
|
||
|
|
return fmt.Errorf(
|
||
|
|
"module download not supported for scheme '%s'", u.Scheme)
|
||
|
|
}
|
||
|
|
|
||
|
|
err = g.Get(dst, u)
|
||
|
|
if err != nil {
|
||
|
|
err = fmt.Errorf("error downloading module '%s': %s", src, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
return err
|
||
|
|
}
|