terraform/config/module/get_hg.go

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package module
import (
"fmt"
"net/url"
"os"
"os/exec"
"runtime"
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)
// HgGetter is a Getter implementation that will download a module from
// a Mercurial repository.
type HgGetter struct{}
func (g *HgGetter) Get(dst string, u *url.URL) error {
if _, err := exec.LookPath("hg"); err != nil {
return fmt.Errorf("hg must be available and on the PATH")
}
newURL, err := urlParse(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)
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if err != nil && !os.IsNotExist(err) {
return err
}
if err != nil {
if err := g.clone(dst, newURL); err != nil {
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return err
}
}
if err := g.pull(dst, newURL); err != nil {
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return err
}
return g.update(dst, newURL, rev)
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}
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(dst string, u *url.URL, rev string) error {
args := []string{"update"}
if rev != "" {
args = append(args, rev)
}
cmd := exec.Command("hg", args...)
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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] == ':'
}