576 lines
18 KiB
Go
576 lines
18 KiB
Go
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package packages
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import (
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"encoding/json"
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"fmt"
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"go/parser"
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"go/token"
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"os"
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"path/filepath"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"golang.org/x/tools/internal/gocommand"
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)
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// processGolistOverlay provides rudimentary support for adding
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// files that don't exist on disk to an overlay. The results can be
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// sometimes incorrect.
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// TODO(matloob): Handle unsupported cases, including the following:
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// - determining the correct package to add given a new import path
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func (state *golistState) processGolistOverlay(response *responseDeduper) (modifiedPkgs, needPkgs []string, err error) {
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havePkgs := make(map[string]string) // importPath -> non-test package ID
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needPkgsSet := make(map[string]bool)
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modifiedPkgsSet := make(map[string]bool)
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pkgOfDir := make(map[string][]*Package)
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for _, pkg := range response.dr.Packages {
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// This is an approximation of import path to id. This can be
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// wrong for tests, vendored packages, and a number of other cases.
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havePkgs[pkg.PkgPath] = pkg.ID
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dir, err := commonDir(pkg.GoFiles)
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if err != nil {
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return nil, nil, err
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}
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if dir != "" {
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pkgOfDir[dir] = append(pkgOfDir[dir], pkg)
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}
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}
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// If no new imports are added, it is safe to avoid loading any needPkgs.
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// Otherwise, it's hard to tell which package is actually being loaded
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// (due to vendoring) and whether any modified package will show up
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// in the transitive set of dependencies (because new imports are added,
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// potentially modifying the transitive set of dependencies).
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var overlayAddsImports bool
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// If both a package and its test package are created by the overlay, we
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// need the real package first. Process all non-test files before test
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// files, and make the whole process deterministic while we're at it.
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var overlayFiles []string
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for opath := range state.cfg.Overlay {
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overlayFiles = append(overlayFiles, opath)
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}
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sort.Slice(overlayFiles, func(i, j int) bool {
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iTest := strings.HasSuffix(overlayFiles[i], "_test.go")
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jTest := strings.HasSuffix(overlayFiles[j], "_test.go")
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if iTest != jTest {
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return !iTest // non-tests are before tests.
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}
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return overlayFiles[i] < overlayFiles[j]
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})
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for _, opath := range overlayFiles {
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contents := state.cfg.Overlay[opath]
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base := filepath.Base(opath)
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dir := filepath.Dir(opath)
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var pkg *Package // if opath belongs to both a package and its test variant, this will be the test variant
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var testVariantOf *Package // if opath is a test file, this is the package it is testing
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var fileExists bool
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isTestFile := strings.HasSuffix(opath, "_test.go")
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pkgName, ok := extractPackageName(opath, contents)
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if !ok {
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// Don't bother adding a file that doesn't even have a parsable package statement
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// to the overlay.
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continue
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}
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// If all the overlay files belong to a different package, change the
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// package name to that package.
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maybeFixPackageName(pkgName, isTestFile, pkgOfDir[dir])
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nextPackage:
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for _, p := range response.dr.Packages {
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if pkgName != p.Name && p.ID != "command-line-arguments" {
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continue
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}
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for _, f := range p.GoFiles {
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if !sameFile(filepath.Dir(f), dir) {
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continue
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}
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// Make sure to capture information on the package's test variant, if needed.
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if isTestFile && !hasTestFiles(p) {
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// TODO(matloob): Are there packages other than the 'production' variant
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// of a package that this can match? This shouldn't match the test main package
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// because the file is generated in another directory.
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testVariantOf = p
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continue nextPackage
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} else if !isTestFile && hasTestFiles(p) {
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// We're examining a test variant, but the overlaid file is
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// a non-test file. Because the overlay implementation
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// (currently) only adds a file to one package, skip this
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// package, so that we can add the file to the production
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// variant of the package. (https://golang.org/issue/36857
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// tracks handling overlays on both the production and test
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// variant of a package).
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continue nextPackage
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}
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if pkg != nil && p != pkg && pkg.PkgPath == p.PkgPath {
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// We have already seen the production version of the
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// for which p is a test variant.
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if hasTestFiles(p) {
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testVariantOf = pkg
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}
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}
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pkg = p
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if filepath.Base(f) == base {
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fileExists = true
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}
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}
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}
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// The overlay could have included an entirely new package or an
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// ad-hoc package. An ad-hoc package is one that we have manually
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// constructed from inadequate `go list` results for a file= query.
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// It will have the ID command-line-arguments.
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if pkg == nil || pkg.ID == "command-line-arguments" {
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// Try to find the module or gopath dir the file is contained in.
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// Then for modules, add the module opath to the beginning.
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pkgPath, ok, err := state.getPkgPath(dir)
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if err != nil {
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return nil, nil, err
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}
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if !ok {
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break
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}
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var forTest string // only set for x tests
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isXTest := strings.HasSuffix(pkgName, "_test")
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if isXTest {
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forTest = pkgPath
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pkgPath += "_test"
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}
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id := pkgPath
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if isTestFile {
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if isXTest {
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id = fmt.Sprintf("%s [%s.test]", pkgPath, forTest)
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} else {
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id = fmt.Sprintf("%s [%s.test]", pkgPath, pkgPath)
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}
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}
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if pkg != nil {
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// TODO(rstambler): We should change the package's path and ID
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// here. The only issue is that this messes with the roots.
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} else {
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// Try to reclaim a package with the same ID, if it exists in the response.
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for _, p := range response.dr.Packages {
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if reclaimPackage(p, id, opath, contents) {
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pkg = p
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break
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}
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}
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// Otherwise, create a new package.
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if pkg == nil {
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pkg = &Package{
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PkgPath: pkgPath,
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ID: id,
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Name: pkgName,
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Imports: make(map[string]*Package),
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}
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response.addPackage(pkg)
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havePkgs[pkg.PkgPath] = id
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// Add the production package's sources for a test variant.
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if isTestFile && !isXTest && testVariantOf != nil {
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pkg.GoFiles = append(pkg.GoFiles, testVariantOf.GoFiles...)
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pkg.CompiledGoFiles = append(pkg.CompiledGoFiles, testVariantOf.CompiledGoFiles...)
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// Add the package under test and its imports to the test variant.
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pkg.forTest = testVariantOf.PkgPath
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for k, v := range testVariantOf.Imports {
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pkg.Imports[k] = &Package{ID: v.ID}
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}
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}
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if isXTest {
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pkg.forTest = forTest
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}
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}
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}
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}
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if !fileExists {
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pkg.GoFiles = append(pkg.GoFiles, opath)
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// TODO(matloob): Adding the file to CompiledGoFiles can exhibit the wrong behavior
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// if the file will be ignored due to its build tags.
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pkg.CompiledGoFiles = append(pkg.CompiledGoFiles, opath)
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modifiedPkgsSet[pkg.ID] = true
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}
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imports, err := extractImports(opath, contents)
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if err != nil {
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// Let the parser or type checker report errors later.
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continue
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}
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for _, imp := range imports {
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// TODO(rstambler): If the package is an x test and the import has
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// a test variant, make sure to replace it.
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if _, found := pkg.Imports[imp]; found {
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continue
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}
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overlayAddsImports = true
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id, ok := havePkgs[imp]
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if !ok {
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var err error
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id, err = state.resolveImport(dir, imp)
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if err != nil {
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return nil, nil, err
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}
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}
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pkg.Imports[imp] = &Package{ID: id}
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// Add dependencies to the non-test variant version of this package as well.
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if testVariantOf != nil {
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testVariantOf.Imports[imp] = &Package{ID: id}
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}
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}
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}
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// toPkgPath guesses the package path given the id.
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toPkgPath := func(sourceDir, id string) (string, error) {
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if i := strings.IndexByte(id, ' '); i >= 0 {
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return state.resolveImport(sourceDir, id[:i])
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}
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return state.resolveImport(sourceDir, id)
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}
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// Now that new packages have been created, do another pass to determine
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// the new set of missing packages.
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for _, pkg := range response.dr.Packages {
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for _, imp := range pkg.Imports {
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if len(pkg.GoFiles) == 0 {
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return nil, nil, fmt.Errorf("cannot resolve imports for package %q with no Go files", pkg.PkgPath)
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}
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pkgPath, err := toPkgPath(filepath.Dir(pkg.GoFiles[0]), imp.ID)
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if err != nil {
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return nil, nil, err
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}
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if _, ok := havePkgs[pkgPath]; !ok {
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needPkgsSet[pkgPath] = true
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}
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}
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}
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if overlayAddsImports {
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needPkgs = make([]string, 0, len(needPkgsSet))
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for pkg := range needPkgsSet {
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needPkgs = append(needPkgs, pkg)
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}
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}
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modifiedPkgs = make([]string, 0, len(modifiedPkgsSet))
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for pkg := range modifiedPkgsSet {
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modifiedPkgs = append(modifiedPkgs, pkg)
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}
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return modifiedPkgs, needPkgs, err
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}
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// resolveImport finds the ID of a package given its import path.
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// In particular, it will find the right vendored copy when in GOPATH mode.
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func (state *golistState) resolveImport(sourceDir, importPath string) (string, error) {
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env, err := state.getEnv()
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if err != nil {
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return "", err
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}
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if env["GOMOD"] != "" {
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return importPath, nil
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}
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searchDir := sourceDir
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for {
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vendorDir := filepath.Join(searchDir, "vendor")
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exists, ok := state.vendorDirs[vendorDir]
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if !ok {
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info, err := os.Stat(vendorDir)
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exists = err == nil && info.IsDir()
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state.vendorDirs[vendorDir] = exists
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}
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if exists {
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vendoredPath := filepath.Join(vendorDir, importPath)
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if info, err := os.Stat(vendoredPath); err == nil && info.IsDir() {
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// We should probably check for .go files here, but shame on anyone who fools us.
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path, ok, err := state.getPkgPath(vendoredPath)
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if err != nil {
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return "", err
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}
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if ok {
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return path, nil
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}
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}
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}
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// We know we've hit the top of the filesystem when we Dir / and get /,
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// or C:\ and get C:\, etc.
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next := filepath.Dir(searchDir)
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if next == searchDir {
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break
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}
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searchDir = next
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}
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return importPath, nil
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}
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func hasTestFiles(p *Package) bool {
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for _, f := range p.GoFiles {
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if strings.HasSuffix(f, "_test.go") {
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return true
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}
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}
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return false
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}
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// determineRootDirs returns a mapping from absolute directories that could
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// contain code to their corresponding import path prefixes.
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func (state *golistState) determineRootDirs() (map[string]string, error) {
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env, err := state.getEnv()
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if err != nil {
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return nil, err
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}
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if env["GOMOD"] != "" {
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state.rootsOnce.Do(func() {
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state.rootDirs, state.rootDirsError = state.determineRootDirsModules()
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})
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} else {
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state.rootsOnce.Do(func() {
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state.rootDirs, state.rootDirsError = state.determineRootDirsGOPATH()
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})
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}
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return state.rootDirs, state.rootDirsError
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}
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func (state *golistState) determineRootDirsModules() (map[string]string, error) {
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// List all of the modules--the first will be the directory for the main
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// module. Any replaced modules will also need to be treated as roots.
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// Editing files in the module cache isn't a great idea, so we don't
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// plan to ever support that.
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out, err := state.invokeGo("list", "-m", "-json", "all")
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if err != nil {
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// 'go list all' will fail if we're outside of a module and
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// GO111MODULE=on. Try falling back without 'all'.
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var innerErr error
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out, innerErr = state.invokeGo("list", "-m", "-json")
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if innerErr != nil {
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return nil, err
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}
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}
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roots := map[string]string{}
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modules := map[string]string{}
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var i int
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for dec := json.NewDecoder(out); dec.More(); {
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mod := new(gocommand.ModuleJSON)
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if err := dec.Decode(mod); err != nil {
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return nil, err
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}
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if mod.Dir != "" && mod.Path != "" {
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// This is a valid module; add it to the map.
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absDir, err := filepath.Abs(mod.Dir)
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if err != nil {
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return nil, err
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}
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modules[absDir] = mod.Path
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// The first result is the main module.
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if i == 0 || mod.Replace != nil && mod.Replace.Path != "" {
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roots[absDir] = mod.Path
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}
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}
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i++
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}
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return roots, nil
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}
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func (state *golistState) determineRootDirsGOPATH() (map[string]string, error) {
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m := map[string]string{}
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for _, dir := range filepath.SplitList(state.mustGetEnv()["GOPATH"]) {
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absDir, err := filepath.Abs(dir)
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if err != nil {
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return nil, err
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}
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m[filepath.Join(absDir, "src")] = ""
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}
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return m, nil
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}
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func extractImports(filename string, contents []byte) ([]string, error) {
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f, err := parser.ParseFile(token.NewFileSet(), filename, contents, parser.ImportsOnly) // TODO(matloob): reuse fileset?
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if err != nil {
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return nil, err
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}
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var res []string
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for _, imp := range f.Imports {
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quotedPath := imp.Path.Value
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path, err := strconv.Unquote(quotedPath)
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if err != nil {
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return nil, err
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}
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res = append(res, path)
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}
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return res, nil
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}
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// reclaimPackage attempts to reuse a package that failed to load in an overlay.
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//
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// If the package has errors and has no Name, GoFiles, or Imports,
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// then it's possible that it doesn't yet exist on disk.
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func reclaimPackage(pkg *Package, id string, filename string, contents []byte) bool {
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// TODO(rstambler): Check the message of the actual error?
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// It differs between $GOPATH and module mode.
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if pkg.ID != id {
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return false
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}
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if len(pkg.Errors) != 1 {
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return false
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}
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if pkg.Name != "" || pkg.ExportFile != "" {
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return false
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}
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if len(pkg.GoFiles) > 0 || len(pkg.CompiledGoFiles) > 0 || len(pkg.OtherFiles) > 0 {
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return false
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}
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|
if len(pkg.Imports) > 0 {
|
||
|
return false
|
||
|
}
|
||
|
pkgName, ok := extractPackageName(filename, contents)
|
||
|
if !ok {
|
||
|
return false
|
||
|
}
|
||
|
pkg.Name = pkgName
|
||
|
pkg.Errors = nil
|
||
|
return true
|
||
|
}
|
||
|
|
||
|
func extractPackageName(filename string, contents []byte) (string, bool) {
|
||
|
// TODO(rstambler): Check the message of the actual error?
|
||
|
// It differs between $GOPATH and module mode.
|
||
|
f, err := parser.ParseFile(token.NewFileSet(), filename, contents, parser.PackageClauseOnly) // TODO(matloob): reuse fileset?
|
||
|
if err != nil {
|
||
|
return "", false
|
||
|
}
|
||
|
return f.Name.Name, true
|
||
|
}
|
||
|
|
||
|
// commonDir returns the directory that all files are in, "" if files is empty,
|
||
|
// or an error if they aren't in the same directory.
|
||
|
func commonDir(files []string) (string, error) {
|
||
|
seen := make(map[string]bool)
|
||
|
for _, f := range files {
|
||
|
seen[filepath.Dir(f)] = true
|
||
|
}
|
||
|
if len(seen) > 1 {
|
||
|
return "", fmt.Errorf("files (%v) are in more than one directory: %v", files, seen)
|
||
|
}
|
||
|
for k := range seen {
|
||
|
// seen has only one element; return it.
|
||
|
return k, nil
|
||
|
}
|
||
|
return "", nil // no files
|
||
|
}
|
||
|
|
||
|
// It is possible that the files in the disk directory dir have a different package
|
||
|
// name from newName, which is deduced from the overlays. If they all have a different
|
||
|
// package name, and they all have the same package name, then that name becomes
|
||
|
// the package name.
|
||
|
// It returns true if it changes the package name, false otherwise.
|
||
|
func maybeFixPackageName(newName string, isTestFile bool, pkgsOfDir []*Package) {
|
||
|
names := make(map[string]int)
|
||
|
for _, p := range pkgsOfDir {
|
||
|
names[p.Name]++
|
||
|
}
|
||
|
if len(names) != 1 {
|
||
|
// some files are in different packages
|
||
|
return
|
||
|
}
|
||
|
var oldName string
|
||
|
for k := range names {
|
||
|
oldName = k
|
||
|
}
|
||
|
if newName == oldName {
|
||
|
return
|
||
|
}
|
||
|
// We might have a case where all of the package names in the directory are
|
||
|
// the same, but the overlay file is for an x test, which belongs to its
|
||
|
// own package. If the x test does not yet exist on disk, we may not yet
|
||
|
// have its package name on disk, but we should not rename the packages.
|
||
|
//
|
||
|
// We use a heuristic to determine if this file belongs to an x test:
|
||
|
// The test file should have a package name whose package name has a _test
|
||
|
// suffix or looks like "newName_test".
|
||
|
maybeXTest := strings.HasPrefix(oldName+"_test", newName) || strings.HasSuffix(newName, "_test")
|
||
|
if isTestFile && maybeXTest {
|
||
|
return
|
||
|
}
|
||
|
for _, p := range pkgsOfDir {
|
||
|
p.Name = newName
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// This function is copy-pasted from
|
||
|
// https://github.com/golang/go/blob/9706f510a5e2754595d716bd64be8375997311fb/src/cmd/go/internal/search/search.go#L360.
|
||
|
// It should be deleted when we remove support for overlays from go/packages.
|
||
|
//
|
||
|
// NOTE: This does not handle any ./... or ./ style queries, as this function
|
||
|
// doesn't know the working directory.
|
||
|
//
|
||
|
// matchPattern(pattern)(name) reports whether
|
||
|
// name matches pattern. Pattern is a limited glob
|
||
|
// pattern in which '...' means 'any string' and there
|
||
|
// is no other special syntax.
|
||
|
// Unfortunately, there are two special cases. Quoting "go help packages":
|
||
|
//
|
||
|
// First, /... at the end of the pattern can match an empty string,
|
||
|
// so that net/... matches both net and packages in its subdirectories, like net/http.
|
||
|
// Second, any slash-separated pattern element containing a wildcard never
|
||
|
// participates in a match of the "vendor" element in the path of a vendored
|
||
|
// package, so that ./... does not match packages in subdirectories of
|
||
|
// ./vendor or ./mycode/vendor, but ./vendor/... and ./mycode/vendor/... do.
|
||
|
// Note, however, that a directory named vendor that itself contains code
|
||
|
// is not a vendored package: cmd/vendor would be a command named vendor,
|
||
|
// and the pattern cmd/... matches it.
|
||
|
func matchPattern(pattern string) func(name string) bool {
|
||
|
// Convert pattern to regular expression.
|
||
|
// The strategy for the trailing /... is to nest it in an explicit ? expression.
|
||
|
// The strategy for the vendor exclusion is to change the unmatchable
|
||
|
// vendor strings to a disallowed code point (vendorChar) and to use
|
||
|
// "(anything but that codepoint)*" as the implementation of the ... wildcard.
|
||
|
// This is a bit complicated but the obvious alternative,
|
||
|
// namely a hand-written search like in most shell glob matchers,
|
||
|
// is too easy to make accidentally exponential.
|
||
|
// Using package regexp guarantees linear-time matching.
|
||
|
|
||
|
const vendorChar = "\x00"
|
||
|
|
||
|
if strings.Contains(pattern, vendorChar) {
|
||
|
return func(name string) bool { return false }
|
||
|
}
|
||
|
|
||
|
re := regexp.QuoteMeta(pattern)
|
||
|
re = replaceVendor(re, vendorChar)
|
||
|
switch {
|
||
|
case strings.HasSuffix(re, `/`+vendorChar+`/\.\.\.`):
|
||
|
re = strings.TrimSuffix(re, `/`+vendorChar+`/\.\.\.`) + `(/vendor|/` + vendorChar + `/\.\.\.)`
|
||
|
case re == vendorChar+`/\.\.\.`:
|
||
|
re = `(/vendor|/` + vendorChar + `/\.\.\.)`
|
||
|
case strings.HasSuffix(re, `/\.\.\.`):
|
||
|
re = strings.TrimSuffix(re, `/\.\.\.`) + `(/\.\.\.)?`
|
||
|
}
|
||
|
re = strings.ReplaceAll(re, `\.\.\.`, `[^`+vendorChar+`]*`)
|
||
|
|
||
|
reg := regexp.MustCompile(`^` + re + `$`)
|
||
|
|
||
|
return func(name string) bool {
|
||
|
if strings.Contains(name, vendorChar) {
|
||
|
return false
|
||
|
}
|
||
|
return reg.MatchString(replaceVendor(name, vendorChar))
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// replaceVendor returns the result of replacing
|
||
|
// non-trailing vendor path elements in x with repl.
|
||
|
func replaceVendor(x, repl string) string {
|
||
|
if !strings.Contains(x, "vendor") {
|
||
|
return x
|
||
|
}
|
||
|
elem := strings.Split(x, "/")
|
||
|
for i := 0; i < len(elem)-1; i++ {
|
||
|
if elem[i] == "vendor" {
|
||
|
elem[i] = repl
|
||
|
}
|
||
|
}
|
||
|
return strings.Join(elem, "/")
|
||
|
}
|