// installPackage installs the specified package and its dependencies.
func installPackage(pkg, parent string, tree *build.Tree, retry bool) (installErr error) {
printf("%s: install\n", pkg)
// Read package information.
dir := filepath.Join(tree.SrcDir(), filepath.FromSlash(pkg))
dirInfo, err := build.ScanDir(dir)
if err != nil {
return &PackageError{pkg, err}
}
// We reserve package main to identify commands.
if parent != "" && dirInfo.Package == "main" {
return &PackageError{pkg, fmt.Errorf("found only package main in %s; cannot import", dir)}
}
// Run gofix if we fail to build and -fix is set.
defer func() {
if retry || installErr == nil || !*doGofix {
return
}
if e, ok := (installErr).(*DependencyError); ok {
// If this package failed to build due to a
// DependencyError, only attempt to gofix it if its
// dependency failed for some reason other than a
// DependencyError or BuildError.
// (If a dep or one of its deps doesn't build there's
// no way that gofixing this package can help.)
switch e.err.(type) {
case *DependencyError:
return
case *BuildError:
return
}
}
gofix(pkg, dir, dirInfo)
installErr = installPackage(pkg, parent, tree, true) // retry
}()
// Install prerequisites.
for _, p := range dirInfo.Imports {
if p == "C" {
continue
}
if err := install(p, pkg); err != nil {
return &DependencyError{pkg, err}
}
}
// Install this package.
err = domake(dir, pkg, tree, dirInfo.IsCommand())
if err != nil {
return &BuildError{pkg, err}
}
return nil
}
