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|
package getter
import (
"fmt"
"io/ioutil"
"net/url"
"os"
"os/exec"
"path/filepath"
urlhelper "github.com/hashicorp/go-getter/helper/url"
)
// GitGetter is a Getter implementation that will download a module from
// a git repository.
type GitGetter struct{}
func (g *GitGetter) Get(dst string, u *url.URL) error {
if _, err := exec.LookPath("git"); err != nil {
return fmt.Errorf("git must be available and on the PATH")
}
// Extract some query parameters we use
var ref string
q := u.Query()
if len(q) > 0 {
ref = q.Get("ref")
q.Del("ref")
// Copy the URL
var newU url.URL = *u
u = &newU
u.RawQuery = q.Encode()
}
// First: clone or update the repository
_, err := os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
return err
}
if err == nil {
err = g.update(dst, ref)
} else {
err = g.clone(dst, u)
}
if err != nil {
return err
}
// Next: check out the proper tag/branch if it is specified, and checkout
if ref == "" {
return nil
}
return g.checkout(dst, ref)
}
// GetFile for Git doesn't support updating at this time. It will download
// the file every time.
func (g *GitGetter) GetFile(dst string, u *url.URL) error {
td, err := ioutil.TempDir("", "getter-git")
if err != nil {
return err
}
if err := os.RemoveAll(td); err != nil {
return err
}
// Get the filename, and strip the filename from the URL so we can
// just get the repository directly.
filename := filepath.Base(u.Path)
u.Path = filepath.Dir(u.Path)
// Get the full repository
if err := g.Get(td, u); err != nil {
return err
}
// Copy the single file
u, err = urlhelper.Parse(fmtFileURL(filepath.Join(td, filename)))
if err != nil {
return err
}
fg := &FileGetter{Copy: true}
return fg.GetFile(dst, u)
}
func (g *GitGetter) checkout(dst string, ref string) error {
cmd := exec.Command("git", "checkout", ref)
cmd.Dir = dst
return getRunCommand(cmd)
}
func (g *GitGetter) clone(dst string, u *url.URL) error {
cmd := exec.Command("git", "clone", u.String(), dst)
return getRunCommand(cmd)
}
func (g *GitGetter) update(dst string, ref string) error {
// Determine if we're a branch. If we're NOT a branch, then we just
// switch to master prior to checking out
cmd := exec.Command("git", "show-ref", "-q", "--verify", "refs/heads/"+ref)
cmd.Dir = dst
if getRunCommand(cmd) != nil {
// Not a branch, switch to master. This will also catch non-existent
// branches, in which case we want to switch to master and then
// checkout the proper branch later.
ref = "master"
}
// We have to be on a branch to pull
if err := g.checkout(dst, ref); err != nil {
return err
}
cmd = exec.Command("git", "pull", "--ff-only")
cmd.Dir = dst
return getRunCommand(cmd)
}
|
