70 lines
1.3 KiB
Go
70 lines
1.3 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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)
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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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// Extract some query parameters we use
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var rev string
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q := u.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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// Copy the URL
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var newU url.URL = *u
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u = &newU
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u.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, u); 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, u); err != nil {
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return err
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}
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return g.update(dst, u, 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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