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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package build
import (
"errors"
"fmt"
"log"
"os"
"path/filepath"
"runtime"
)
// Path is a validated list of Trees derived from $GOROOT and $GOPATH at init.
var Path []*Tree
// Tree describes a Go source tree, either $GOROOT or one from $GOPATH.
type Tree struct {
Path string
Goroot bool
}
func newTree(p string) (*Tree, error) {
if !filepath.IsAbs(p) {
return nil, errors.New("must be absolute")
}
ep, err := filepath.EvalSymlinks(p)
if err != nil {
return nil, err
}
return &Tree{Path: ep}, nil
}
// SrcDir returns the tree's package source directory.
func (t *Tree) SrcDir() string {
if t.Goroot {
return filepath.Join(t.Path, "src", "pkg")
}
return filepath.Join(t.Path, "src")
}
// PkgDir returns the tree's package object directory.
func (t *Tree) PkgDir() string {
goos, goarch := runtime.GOOS, runtime.GOARCH
if e := os.Getenv("GOOS"); e != "" {
goos = e
}
if e := os.Getenv("GOARCH"); e != "" {
goarch = e
}
return filepath.Join(t.Path, "pkg", goos+"_"+goarch)
}
// BinDir returns the tree's binary executable directory.
func (t *Tree) BinDir() string {
if t.Goroot {
if gobin := os.Getenv("GOBIN"); gobin != "" {
return gobin
}
}
return filepath.Join(t.Path, "bin")
}
// HasSrc returns whether the given package's
// source can be found inside this Tree.
func (t *Tree) HasSrc(pkg string) bool {
fi, err := os.Stat(filepath.Join(t.SrcDir(), pkg))
if err != nil {
return false
}
return fi.IsDirectory()
}
// HasPkg returns whether the given package's
// object file can be found inside this Tree.
func (t *Tree) HasPkg(pkg string) bool {
fi, err := os.Stat(filepath.Join(t.PkgDir(), pkg+".a"))
if err != nil {
return false
}
return fi.IsRegular()
// TODO(adg): check object version is consistent
}
var (
ErrNotFound = errors.New("go/build: package could not be found locally")
ErrTreeNotFound = errors.New("go/build: no valid GOROOT or GOPATH could be found")
)
// FindTree takes an import or filesystem path and returns the
// tree where the package source should be and the package import path.
func FindTree(path string) (tree *Tree, pkg string, err error) {
if isLocalPath(path) {
if path, err = filepath.Abs(path); err != nil {
return
}
if path, err = filepath.EvalSymlinks(path); err != nil {
return
}
for _, t := range Path {
tpath := t.SrcDir() + string(filepath.Separator)
if !filepath.HasPrefix(path, tpath) {
continue
}
tree = t
pkg = path[len(tpath):]
return
}
err = fmt.Errorf("path %q not inside a GOPATH", path)
return
}
tree = defaultTree
pkg = path
for _, t := range Path {
if t.HasSrc(pkg) {
tree = t
return
}
}
if tree == nil {
err = ErrTreeNotFound
} else {
err = ErrNotFound
}
return
}
// isLocalPath returns whether the given path is local (/foo ./foo ../foo . ..)
// Windows paths that starts with drive letter (c:\foo c:foo) are considered local.
func isLocalPath(s string) bool {
const sep = string(filepath.Separator)
return s == "." || s == ".." ||
filepath.HasPrefix(s, sep) ||
filepath.HasPrefix(s, "."+sep) || filepath.HasPrefix(s, ".."+sep) ||
filepath.VolumeName(s) != ""
}
var (
// argument lists used by the build's gc and ld methods
gcImportArgs []string
ldImportArgs []string
// default tree for remote packages
defaultTree *Tree
)
// set up Path: parse and validate GOROOT and GOPATH variables
func init() {
root := runtime.GOROOT()
t, err := newTree(root)
if err != nil {
log.Printf("go/build: invalid GOROOT %q: %v", root, err)
} else {
t.Goroot = true
Path = []*Tree{t}
}
for _, p := range filepath.SplitList(os.Getenv("GOPATH")) {
if p == "" {
continue
}
t, err := newTree(p)
if err != nil {
log.Printf("go/build: invalid GOPATH %q: %v", p, err)
continue
}
Path = append(Path, t)
gcImportArgs = append(gcImportArgs, "-I", t.PkgDir())
ldImportArgs = append(ldImportArgs, "-L", t.PkgDir())
// select first GOPATH entry as default
if defaultTree == nil {
defaultTree = t
}
}
// use GOROOT if no valid GOPATH specified
if defaultTree == nil && len(Path) > 0 {
defaultTree = Path[0]
}
}
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