mirror of
https://github.com/kubernetes-sigs/kustomize.git
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150 lines
3.3 KiB
Go
150 lines
3.3 KiB
Go
// Copyright 2019 The Kubernetes Authors.
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// SPDX-License-Identifier: Apache-2.0
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package compiler
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import (
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strings"
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"time"
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"sigs.k8s.io/kustomize/api/filesys"
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"sigs.k8s.io/kustomize/api/pgmconfig"
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)
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// Compiler creates Go plugin object files.
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//
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// Source code is read from
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// ${srcRoot}/${g}/${v}/${k}.go
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//
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// Object code is written to
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// ${objRoot}/${g}/${v}/${k}.so
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type Compiler struct {
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srcRoot string
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objRoot string
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}
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// DefaultSrcRoot guesses where the user
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// has her ${g}/${v}/$lower(${k})/${k}.go files.
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func DefaultSrcRoot(fSys filesys.FileSystem) (string, error) {
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return pgmconfig.FirstDirThatExistsElseError(
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"source directory", fSys, []pgmconfig.NotedFunc{
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{
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Note: "old style $GOPATH",
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F: func() string {
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return filepath.Join(
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os.Getenv("GOPATH"),
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"src", pgmconfig.DomainName,
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pgmconfig.ProgramName, pgmconfig.RelPluginHome)
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},
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},
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{
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Note: "HOME with literal 'gopath'",
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F: func() string {
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return filepath.Join(
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pgmconfig.HomeDir(), "gopath",
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"src", pgmconfig.DomainName,
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pgmconfig.ProgramName, pgmconfig.RelPluginHome)
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},
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},
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{
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Note: "home directory",
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F: func() string {
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return filepath.Join(
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pgmconfig.HomeDir(), pgmconfig.DomainName,
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pgmconfig.ProgramName, pgmconfig.RelPluginHome)
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},
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},
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})
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}
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// NewCompiler returns a new compiler instance.
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func NewCompiler(srcRoot, objRoot string) *Compiler {
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return &Compiler{srcRoot: srcRoot, objRoot: objRoot}
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}
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// ObjRoot is root of compilation target tree.
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func (b *Compiler) ObjRoot() string {
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return b.objRoot
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}
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// SrcRoot is where to find src.
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func (b *Compiler) SrcRoot() string {
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return b.srcRoot
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}
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func goBin() string {
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return filepath.Join(runtime.GOROOT(), "bin", "go")
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}
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// Compile reads ${srcRoot}/${g}/${v}/${k}.go
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// and writes ${objRoot}/${g}/${v}/${k}.so
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func (b *Compiler) Compile(g, v, k string) error {
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lowK := strings.ToLower(k)
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objDir := filepath.Join(b.objRoot, g, v, lowK)
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objFile := filepath.Join(objDir, k) + ".so"
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if RecentFileExists(objFile) {
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// Skip rebuilding it.
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return nil
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}
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err := os.MkdirAll(objDir, os.ModePerm)
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if err != nil {
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return err
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}
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srcFile := filepath.Join(b.srcRoot, g, v, lowK, k) + ".go"
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if !FileExists(srcFile) {
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// Handy for tests of lone plugins.
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s := k + ".go"
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if !FileExists(s) {
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return fmt.Errorf(
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"cannot find source at '%s' or '%s'", srcFile, s)
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}
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srcFile = s
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}
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commands := []string{
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"build",
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"-buildmode",
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"plugin",
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"-o", objFile, srcFile,
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}
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goBin := goBin()
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if !FileExists(goBin) {
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return fmt.Errorf(
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"cannot find go compiler %s", goBin)
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}
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cmd := exec.Command(goBin, commands...)
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cmd.Env = os.Environ()
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if err := cmd.Run(); err != nil {
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return fmt.Errorf(
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"compiler error building %s: %v", srcFile, err)
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}
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return nil
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}
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// True if file less than 3 minutes old, i.e. not
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// accidentally left over from some earlier build.
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func RecentFileExists(path string) bool {
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fi, err := os.Stat(path)
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if err != nil {
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if os.IsNotExist(err) {
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return false
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}
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}
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age := time.Now().Sub(fi.ModTime())
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return age.Minutes() < 3
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}
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func FileExists(name string) bool {
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if _, err := os.Stat(name); err != nil {
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if os.IsNotExist(err) {
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return false
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}
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}
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return true
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}
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