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package getter
import (
"context"
"fmt"
"net/url"
"os"
"os/exec"
"path/filepath"
"runtime"
urlhelper "github.com/hashicorp/go-getter/helper/url"
safetemp "github.com/hashicorp/go-safetemp"
)
// HgGetter is a Getter implementation that will download a module from
// a Mercurial repository.
type HgGetter struct {
getter
}
func (g *HgGetter) ClientMode(_ *url.URL) (ClientMode, error) {
return ClientModeDir, nil
}
func (g *HgGetter) Get(dst string, u *url.URL) error {
ctx := g.Context()
if _, err := exec.LookPath("hg"); err != nil {
return fmt.Errorf("hg must be available and on the PATH")
}
newURL, err := urlhelper.Parse(u.String())
if err != nil {
return err
}
if fixWindowsDrivePath(newURL) {
// See valid file path form on http://www.selenic.com/hg/help/urls
newURL.Path = fmt.Sprintf("/%s", newURL.Path)
}
// Extract some query parameters we use
var rev string
q := newURL.Query()
if len(q) > 0 {
rev = q.Get("rev")
q.Del("rev")
newURL.RawQuery = q.Encode()
}
_, err = os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
return err
}
if err != nil {
if err := g.clone(dst, newURL); err != nil {
return err
}
}
if err := g.pull(dst, newURL); err != nil {
return err
}
return g.update(ctx, dst, newURL, rev)
}
// GetFile for Hg doesn't support updating at this time. It will download
// the file every time.
func (g *HgGetter) GetFile(dst string, u *url.URL) error {
// Create a temporary directory to store the full source. This has to be
// a non-existent directory.
td, tdcloser, err := safetemp.Dir("", "getter")
if err != nil {
return err
}
defer tdcloser.Close()
// 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.ToSlash(filepath.Dir(u.Path))
// If we're on Windows, we need to set the host to "localhost" for hg
if runtime.GOOS == "windows" {
u.Host = "localhost"
}
// 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, getter: g.getter}
return fg.GetFile(dst, u)
}
func (g *HgGetter) clone(dst string, u *url.URL) error {
cmd := exec.Command("hg", "clone", "-U", u.String(), dst)
return getRunCommand(cmd)
}
func (g *HgGetter) pull(dst string, u *url.URL) error {
cmd := exec.Command("hg", "pull")
cmd.Dir = dst
return getRunCommand(cmd)
}
func (g *HgGetter) update(ctx context.Context, dst string, u *url.URL, rev string) error {
args := []string{"update"}
if rev != "" {
args = append(args, rev)
}
cmd := exec.CommandContext(ctx, "hg", args...)
cmd.Dir = dst
return getRunCommand(cmd)
}
func fixWindowsDrivePath(u *url.URL) bool {
// hg assumes a file:/// prefix for Windows drive letter file paths.
// (e.g. file:///c:/foo/bar)
// If the URL Path does not begin with a '/' character, the resulting URL
// path will have a file:// prefix. (e.g. file://c:/foo/bar)
// See http://www.selenic.com/hg/help/urls and the examples listed in
// http://selenic.com/repo/hg-stable/file/1265a3a71d75/mercurial/util.py#l1936
return runtime.GOOS == "windows" && u.Scheme == "file" &&
len(u.Path) > 1 && u.Path[0] != '/' && u.Path[1] == ':'
}
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