90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
package module
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import (
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"fmt"
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"net/url"
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"os"
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"os/exec"
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"runtime"
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urlhelper "github.com/hashicorp/terraform/helper/url"
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)
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// HgGetter is a Getter implementation that will download a module from
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// a Mercurial repository.
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type HgGetter struct{}
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func (g *HgGetter) Get(dst string, u *url.URL) error {
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if _, err := exec.LookPath("hg"); err != nil {
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return fmt.Errorf("hg must be available and on the PATH")
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}
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newURL, err := urlhelper.Parse(u.String())
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if err != nil {
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return err
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}
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if fixWindowsDrivePath(newURL) {
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// See valid file path form on http://www.selenic.com/hg/help/urls
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newURL.Path = fmt.Sprintf("/%s", newURL.Path)
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}
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// Extract some query parameters we use
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var rev string
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q := newURL.Query()
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if len(q) > 0 {
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rev = q.Get("rev")
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q.Del("rev")
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newURL.RawQuery = q.Encode()
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}
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_, err = os.Stat(dst)
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if err != nil && !os.IsNotExist(err) {
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return err
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}
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if err != nil {
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if err := g.clone(dst, newURL); err != nil {
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return err
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}
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}
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if err := g.pull(dst, newURL); err != nil {
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return err
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}
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return g.update(dst, newURL, rev)
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}
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func (g *HgGetter) clone(dst string, u *url.URL) error {
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cmd := exec.Command("hg", "clone", "-U", u.String(), dst)
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return getRunCommand(cmd)
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}
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func (g *HgGetter) pull(dst string, u *url.URL) error {
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cmd := exec.Command("hg", "pull")
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cmd.Dir = dst
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return getRunCommand(cmd)
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}
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func (g *HgGetter) update(dst string, u *url.URL, rev string) error {
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args := []string{"update"}
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if rev != "" {
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args = append(args, rev)
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}
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cmd := exec.Command("hg", args...)
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cmd.Dir = dst
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return getRunCommand(cmd)
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}
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func fixWindowsDrivePath(u *url.URL) bool {
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// hg assumes a file:/// prefix for Windows drive letter file paths.
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// (e.g. file:///c:/foo/bar)
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// If the URL Path does not begin with a '/' character, the resulting URL
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// path will have a file:// prefix. (e.g. file://c:/foo/bar)
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// See http://www.selenic.com/hg/help/urls and the examples listed in
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// http://selenic.com/repo/hg-stable/file/1265a3a71d75/mercurial/util.py#l1936
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return runtime.GOOS == "windows" && u.Scheme == "file" &&
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len(u.Path) > 1 && u.Path[0] != '/' && u.Path[1] == ':'
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}
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