// Apply attempts to locate the repository and pin it to the head version.
func (dep *RepoVersion) Apply() error {
// Find the repository
var repo *graph.Repository
for _, pkg := range dep.Packages {
// Make sure the package is installed and up-to-date
get := exec.Command("go", "get", "-d", pkg)
get.Dir = os.TempDir()
get.Stdout = os.Stdout
get.Stderr = os.Stderr
if err := get.Run(); err != nil {
continue
}
// Scan for new packages
if err := Deps.Scan(dep.Pattern); err != nil {
continue
}
// See if we found the package we wanted
p, ok := Deps.Package[pkg]
if !ok {
continue
}
// Get the repository
r, ok := Deps.Repository[p.RepoRoot]
if !ok {
continue
}
repo = r
break
}
if repo == nil {
return fmt.Errorf("apply(%q@%q): unable to locate repository", dep.Pattern, dep.Head)
}
// Get fallback in case the update fails
fallback, err := repo.Head()
if err != nil {
return fmt.Errorf("apply(%q@%q): unable to determine fallback version", dep.Pattern, dep.Head)
}
// Pin the version
if err := repo.ToRev(dep.Head); err != nil {
if ferr := repo.ToRev(fallback); ferr != nil {
return fmt.Errorf("apply(%q): pin(%q) [%s] and fallback(%q) [%s] failed",
dep.Pattern, dep.Head, err, fallback, ferr)
}
return fmt.Errorf("apply(%q@%q): pin failed: %s", dep.Pattern, dep.Head, err)
}
log.Printf("Pinned %s @ %s", dep.Pattern, dep.Head)
return nil
}
