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cmd/go: a raft of fixes

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* add -work option to save temporary files (Fixes issue 2980)
* fix go test -i to work with cgo packages (Fixes issue 2936)
* do not overwrite/remove empty directories or non-object
  files during build (Fixes issue 2829)
* remove package main vs package non-main heuristic:
  a directory must contain only one package (Fixes issue 2864)
* to make last item workable, ignore +build tags for files
  named on command line: go build x.go builds x.go even
  if it says // +build ignore.
* add // +build ignore tags to helper programs

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/5674043
This commit is contained in:
Russ Cox 2012-02-14 16:39:20 -05:00
parent 87a04c0bcf
commit 9f333170bf
14 changed files with 113 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
src/cmd/go/build.go
View File

@ -23,7 +23,7 @@ import (
)
var cmdBuild = &Command{
UsageLine: "build [-a] [-n] [-o output] [-p n] [-v] [-x] [importpath... | gofiles...]",
UsageLine: "build [-a] [-n] [-o output] [-p n] [-v] [-x] [-work] [importpath... | gofiles...]",
Short: "compile packages and dependencies",
Long: `
Build compiles the packages named by the import paths,
@ -48,6 +48,9 @@ It is an error to use -o when the command line specifies multiple packages.
The -p flag specifies the number of builds that can be run in parallel.
The default is the number of CPUs available.
The -work flag causes build to print the name of the temporary work
directory and not delete it when exiting.
For more about import paths, see 'go help importpath'.
See also: go install, go get, go clean.
@ -70,6 +73,7 @@ var buildP = runtime.NumCPU() // -p flag
var buildV bool // -v flag
var buildX bool // -x flag
var buildO = cmdBuild.Flag.String("o", "", "output file")
var buildWork bool // -work flag
var buildContext = build.DefaultContext
@ -80,6 +84,7 @@ func addBuildFlags(cmd *Command) {
cmd.Flag.IntVar(&buildP, "p", buildP, "")
cmd.Flag.BoolVar(&buildV, "v", false, "")
cmd.Flag.BoolVar(&buildX, "x", false, "")
cmd.Flag.BoolVar(&buildWork, "work", false, "")
// TODO(rsc): This -t flag is used by buildscript.sh but
// not documented. Should be documented but the
@ -140,7 +145,7 @@ func runBuild(cmd *Command, args []string) {
}
var cmdInstall = &Command{
UsageLine: "install [-a] [-n] [-p n] [-v] [-x] [importpath...]",
UsageLine: "install [-a] [-n] [-p n] [-v] [-x] [-work] [importpath...]",
Short: "compile and install packages and dependencies",
Long: `
Install compiles and installs the packages named by the import paths,
@ -154,6 +159,9 @@ The -x flag prints the commands.
The -p flag specifies the number of builds that can be run in parallel.
The default is the number of CPUs available.
The -work flag causes build to print the name of the temporary work
directory and not delete it when exiting.
For more about import paths, see 'go help importpath'.
See also: go build, go get, go clean.
@ -263,10 +271,12 @@ func (b *builder) init() {
if err != nil {
fatalf("%s", err)
}
if buildX {
if buildX || buildWork {
fmt.Printf("WORK=%s\n", b.work)
}
atexit(func() { os.RemoveAll(b.work) })
if !buildWork {
atexit(func() { os.RemoveAll(b.work) })
}
}
}
@ -300,7 +310,7 @@ func goFilesPackage(gofiles []string, target string) *Package {
ctxt.ReadDir = func(string) ([]os.FileInfo, error) { return dir, nil }
pwd, _ := os.Getwd()
var stk importStack
pkg := scanPackage(&ctxt, &build.Tree{Path: "."}, "<command line>", "<command line>", pwd+"/.", &stk)
pkg := scanPackage(&ctxt, &build.Tree{Path: "."}, "<command line>", "<command line>", pwd+"/.", &stk, true)
if pkg.Error != nil {
fatalf("%s", pkg.Error)
}
@ -686,8 +696,10 @@ func (b *builder) install(a *action) error {
// garbage down in a large build. On an operating system
// with aggressive buffering, cleaning incrementally like
// this keeps the intermediate objects from hitting the disk.
defer os.RemoveAll(a1.objdir)
defer os.Remove(a1.target)
if !buildWork {
defer os.RemoveAll(a1.objdir)
defer os.Remove(a1.target)
}
return b.copyFile(a.target, a1.target, perm)
}
@ -745,6 +757,18 @@ func (b *builder) copyFile(dst, src string, perm os.FileMode) error {
}
defer sf.Close()
// Be careful about removing/overwriting dst.
// Do not remove/overwrite if dst exists and is a directory
// or a non-object file.
if fi, err := os.Stat(dst); err == nil {
if fi.IsDir() {
return fmt.Errorf("build output %q already exists and is a directory", dst)
}
if !isObject(dst) {
return fmt.Errorf("build output %q already exists and is not an object file", dst)
}
}
// On Windows, remove lingering ~ file from last attempt.
if toolIsWindows {
if _, err := os.Stat(dst + "~"); err == nil {
@ -777,6 +801,32 @@ func (b *builder) copyFile(dst, src string, perm os.FileMode) error {
return nil
}
var objectMagic = [][]byte{
{'!', '<', 'a', 'r', 'c', 'h', '>', '\n'}, // Package archive
{'\x7F', 'E', 'L', 'F'}, // ELF
{0xFE, 0xED, 0xFA, 0xCE}, // Mach-O big-endian 32-bit
{0xFE, 0xED, 0xFA, 0xCF}, // Mach-O big-endian 64-bit
{0xCE, 0xFA, 0xED, 0xFE}, // Mach-O little-endian 32-bit
{0xCF, 0xFA, 0xED, 0xFE}, // Mach-O little-endian 64-bit
{0x4d, 0x5a, 0x90, 0x00, 0x03, 0x00, 0x04, 0x00}, // PE (Windows) as generated by 6l/8l
}
func isObject(s string) bool {
f, err := os.Open(s)
if err != nil {
return false
}
defer f.Close()
buf := make([]byte, 64)
io.ReadFull(f, buf)
for _, magic := range objectMagic {
if bytes.HasPrefix(buf, magic) {
return true
}
}
return false
}
// fmtcmd formats a command in the manner of fmt.Sprintf but also:
//
// If dir is non-empty and the script is not in dir right now,

2
src/cmd/go/main.go
View File

@ -398,7 +398,7 @@ func allPackages(pattern string) []string {
have[name] = true
_, err = build.ScanDir(path)
if err != nil {
if err != nil && strings.Contains(err.Error(), "no Go source files") {
return nil
}

25
src/cmd/go/pkg.go
View File

@ -6,6 +6,7 @@ package main
import (
"bytes"
"fmt"
"go/build"
"go/scanner"
"os"
@ -135,6 +136,7 @@ func loadPackage(arg string, stk *importStack) *Package {
}
// Find basic information about package path.
isCmd := false
t, importPath, err := build.FindTree(arg)
dir := ""
// Maybe it is a standard command.
@ -146,6 +148,7 @@ func loadPackage(arg string, stk *importStack) *Package {
importPath = arg
dir = p
err = nil
isCmd = true
}
}
// Maybe it is a path to a standard command.
@ -158,6 +161,7 @@ func loadPackage(arg string, stk *importStack) *Package {
importPath = filepath.FromSlash(arg[len(cmd):])
dir = arg
err = nil
isCmd = true
}
}
if err != nil {
@ -178,12 +182,23 @@ func loadPackage(arg string, stk *importStack) *Package {
}
// Maybe we know the package by its directory.
if p := packageCache[dir]; p != nil {
p := packageCache[dir]
if p != nil {
packageCache[importPath] = p
return reusePackage(p, stk)
p = reusePackage(p, stk)
} else {
p = scanPackage(&buildContext, t, arg, importPath, dir, stk, false)
}
return scanPackage(&buildContext, t, arg, importPath, dir, stk)
// If we loaded the files from the Go root's cmd/ tree,
// it must be a command (package main).
if isCmd && p.Error == nil && p.Name != "main" {
p.Error = &PackageError{
ImportStack: stk.copy(),
Err: fmt.Sprintf("expected package main in %q; found package %s", dir, p.Name),
}
}
return p
}
func reusePackage(p *Package, stk *importStack) *Package {
@ -243,7 +258,7 @@ var isGoTool = map[string]bool{
"exp/ebnflint": true,
}
func scanPackage(ctxt *build.Context, t *build.Tree, arg, importPath, dir string, stk *importStack) *Package {
func scanPackage(ctxt *build.Context, t *build.Tree, arg, importPath, dir string, stk *importStack, useAllFiles bool) *Package {
// Read the files in the directory to learn the structure
// of the package.
p := &Package{
@ -255,7 +270,9 @@ func scanPackage(ctxt *build.Context, t *build.Tree, arg, importPath, dir string
packageCache[dir] = p
packageCache[importPath] = p
ctxt.UseAllFiles = useAllFiles
info, err := ctxt.ScanDir(dir)
useAllFiles = false // flag does not apply to dependencies
if err != nil {
p.Error = &PackageError{
ImportStack: stk.copy(),

4
src/cmd/go/test.go
View File

@ -273,6 +273,10 @@ func runTest(cmd *Command, args []string) {
}
}
// Ignore pseudo-packages.
delete(deps, "C")
delete(deps, "unsafe")
all := []string{}
for path := range deps {
all = append(all, path)

2
src/pkg/crypto/tls/generate_cert.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// Generate a self-signed X.509 certificate for a TLS server. Outputs to
// 'cert.pem' and 'key.pem' and will overwrite existing files.

2
src/pkg/encoding/gob/dump.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
package main
// Need to compile package gob with debug.go to build this program.

2
src/pkg/exp/norm/maketables.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// Normalization table generator.
// Data read from the web.
// See forminfo.go for a description of the trie values associated with each rune.

2
src/pkg/exp/norm/maketesttables.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// Generate test data for trie code.
package main

2
src/pkg/exp/norm/normregtest.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
package main
import (

2
src/pkg/exp/norm/triegen.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// Trie table generator.
// Used by make*tables tools to generate a go file with trie data structures
// for mapping UTF-8 to a 16-bit value. All but the last byte in a UTF-8 byte

28
src/pkg/go/build/dir.go
View File

@ -25,10 +25,11 @@ import (
// A Context specifies the supporting context for a build.
type Context struct {
GOARCH string // target architecture
GOOS string // target operating system
CgoEnabled bool // whether cgo can be used
BuildTags []string // additional tags to recognize in +build lines
GOARCH string // target architecture
GOOS string // target operating system
CgoEnabled bool // whether cgo can be used
BuildTags []string // additional tags to recognize in +build lines
UseAllFiles bool // use files regardless of +build lines, file names
// By default, ScanDir uses the operating system's
// file system calls to read directories and files.
@ -225,6 +226,7 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
var Sfiles []string // files with ".S" (capital S)
var di DirInfo
var firstFile string
imported := make(map[string][]token.Position)
testImported := make(map[string][]token.Position)
fset := token.NewFileSet()
@ -237,7 +239,7 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
strings.HasPrefix(name, ".") {
continue
}
if !ctxt.goodOSArchFile(name) {
if !ctxt.UseAllFiles && !ctxt.goodOSArchFile(name) {
continue
}
@ -250,12 +252,13 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
continue
}
// Look for +build comments to accept or reject the file.
filename, data, err := ctxt.readFile(dir, name)
if err != nil {
return nil, err
}
if !ctxt.shouldBuild(data) {
// Look for +build comments to accept or reject the file.
if !ctxt.UseAllFiles && !ctxt.shouldBuild(data) {
continue
}
@ -281,9 +284,6 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
}
pkg := string(pf.Name.Name)
if pkg == "main" && di.Package != "" && di.Package != "main" {
continue
}
if pkg == "documentation" {
continue
}
@ -293,15 +293,11 @@ func (ctxt *Context) ScanDir(dir string) (info *DirInfo, err error) {
pkg = pkg[:len(pkg)-len("_test")]
}
if pkg != di.Package && di.Package == "main" {
// Found non-main package but was recording
// information about package main. Reset.
di = DirInfo{}
}
if di.Package == "" {
di.Package = pkg
firstFile = name
} else if pkg != di.Package {
return nil, fmt.Errorf("%s: found packages %s and %s", dir, pkg, di.Package)
return nil, fmt.Errorf("%s: found packages %s (%s) and %s (%s)", dir, di.Package, firstFile, pkg, name)
}
if pf.Doc != nil {
if di.PackageComment != nil {

2
src/pkg/go/doc/headscan.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
/*
The headscan command extracts comment headings from package files;
it is used to detect false positives which may require an adjustment

2
src/pkg/net/http/triv.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
package main
import (

2
src/pkg/unicode/maketables.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// Unicode table generator.
// Data read from the web.