func Git(depdir string, dep *Dependency) error {
localloc := filepath.Join(depdir, "src", dep.Path)
if _, err := os.Stat(localloc); os.IsNotExist(err) {
fmt.Println("git", "clone", dep.Location, localloc)
err := exec.PipedCmd("git", "clone", dep.Location, localloc)
if err != nil {
return err
}
} else {
fmt.Println(localloc, "exists")
}
origcwd, err := os.Getwd()
if err != nil {
return err
}
err = os.Chdir(localloc)
if err != nil {
return err
}
defer os.Chdir(origcwd)
fmt.Println("git", "fetch", "-pv", "--all")
err = exec.PipedCmd("git", "fetch", "-pv", "--all")
if err != nil {
return err
}
if dep.Reference == "" {
dep.Reference = "master"
}
if exists, err := originBranchExists(dep.Reference); err != nil {
return err
} else if exists {
dep.Reference = "origin/" + dep.Reference
}
fmt.Println("git", "checkout", dep.Reference)
stdout, stderr, err := exec.TrimmedCmd("git", "checkout", dep.Reference)
if err != nil {
return err
}
if stdout != "" {
fmt.Println(stdout)
}
// Moving to a 'detached HEAD' state causes git to output a huge explanation
// to stderr. We only want the last line.
lines := strings.Split(stderr, "\n")
fmt.Println(lines[len(lines)-1])
fmt.Println("git", "clean", "-f", "-d")
err = exec.PipedCmd("git", "clean", "-f", "-d")
return err
}
// If 'origin/branch' exists, return true.
func originBranchExists(branch string) (bool, error) {
branches, _, err := exec.TrimmedCmd("git", "branch", "--remote")
if err != nil {
return false, err
}
for _, b := range strings.Split(branches, "\n") {
b := strings.TrimSpace(b)
if strings.HasSuffix(b, "origin/"+branch) {
return true, nil
}
}
return false, nil
}