75 lines
1.5 KiB
Go
75 lines
1.5 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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// GitGetter is a Getter implementation that will download a module from
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// a git repository.
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type GitGetter struct{}
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func (g *GitGetter) Get(dst string, u *url.URL) error {
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if _, err := exec.LookPath("git"); err != nil {
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return fmt.Errorf("git 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 ref string
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q := u.Query()
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if len(q) > 0 {
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ref = q.Get("ref")
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q.Del("ref")
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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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// First: clone or update the repository
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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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err = g.update(dst, u)
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} else {
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err = g.clone(dst, u)
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}
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if err != nil {
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return err
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}
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// Next: check out the proper tag/branch if it is specified, and checkout
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if ref == "" {
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return nil
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}
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return g.checkout(dst, ref)
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}
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func (g *GitGetter) checkout(dst string, ref string) error {
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cmd := exec.Command("git", "checkout", ref)
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cmd.Dir = dst
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return getRunCommand(cmd)
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}
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func (g *GitGetter) clone(dst string, u *url.URL) error {
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cmd := exec.Command("git", "clone", u.String(), dst)
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return getRunCommand(cmd)
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}
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func (g *GitGetter) update(dst string, u *url.URL) error {
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// We have to be on a branch to pull
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if err := g.checkout(dst, "master"); err != nil {
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return err
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}
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cmd := exec.Command("git", "pull", "--ff-only")
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cmd.Dir = dst
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return getRunCommand(cmd)
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}
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