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Copy pathgolist.go
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1099 lines (1007 loc) · 36.4 KB
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// Copyright 2018 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 packages
import (
"bytes"
"context"
"encoding/json"
"fmt"
"go/types"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"reflect"
"sort"
"strconv"
"strings"
"sync"
"unicode"
exec "golang.org/x/sys/execabs"
"golang.org/x/tools/go/internal/packagesdriver"
"golang.org/x/tools/internal/gocommand"
"golang.org/x/tools/internal/packagesinternal"
"golang.org/x/xerrors"
)
// debug controls verbose logging.
var debug, _ = strconv.ParseBool(os.Getenv("GOPACKAGESDEBUG"))
// A goTooOldError reports that the go command
// found by exec.LookPath is too old to use the new go list behavior.
type goTooOldError struct {
error
}
// responseDeduper wraps a driverResponse, deduplicating its contents.
type responseDeduper struct {
seenRoots map[string]bool
seenPackages map[string]*Package
dr *driverResponse
}
func newDeduper() *responseDeduper {
return &responseDeduper{
dr: &driverResponse{},
seenRoots: map[string]bool{},
seenPackages: map[string]*Package{},
}
}
// addAll fills in r with a driverResponse.
func (r *responseDeduper) addAll(dr *driverResponse) {
for _, pkg := range dr.Packages {
r.addPackage(pkg)
}
for _, root := range dr.Roots {
r.addRoot(root)
}
}
func (r *responseDeduper) addPackage(p *Package) {
if r.seenPackages[p.ID] != nil {
return
}
r.seenPackages[p.ID] = p
r.dr.Packages = append(r.dr.Packages, p)
}
func (r *responseDeduper) addRoot(id string) {
if r.seenRoots[id] {
return
}
r.seenRoots[id] = true
r.dr.Roots = append(r.dr.Roots, id)
}
type golistState struct {
cfg *Config
ctx context.Context
envOnce sync.Once
goEnvError error
goEnv map[string]string
rootsOnce sync.Once
rootDirsError error
rootDirs map[string]string
goVersionOnce sync.Once
goVersionError error
goVersion int // The X in Go 1.X.
// vendorDirs caches the (non)existence of vendor directories.
vendorDirs map[string]bool
}
// getEnv returns Go environment variables. Only specific variables are
// populated -- computing all of them is slow.
func (state *golistState) getEnv() (map[string]string, error) {
state.envOnce.Do(func() {
var b *bytes.Buffer
b, state.goEnvError = state.invokeGo("env", "-json", "GOMOD", "GOPATH")
if state.goEnvError != nil {
return
}
state.goEnv = make(map[string]string)
decoder := json.NewDecoder(b)
if state.goEnvError = decoder.Decode(&state.goEnv); state.goEnvError != nil {
return
}
})
return state.goEnv, state.goEnvError
}
// mustGetEnv is a convenience function that can be used if getEnv has already succeeded.
func (state *golistState) mustGetEnv() map[string]string {
env, err := state.getEnv()
if err != nil {
panic(fmt.Sprintf("mustGetEnv: %v", err))
}
return env
}
// goListDriver uses the go list command to interpret the patterns and produce
// the build system package structure.
// See driver for more details.
func goListDriver(cfg *Config, patterns ...string) (*driverResponse, error) {
// Make sure that any asynchronous go commands are killed when we return.
parentCtx := cfg.Context
if parentCtx == nil {
parentCtx = context.Background()
}
ctx, cancel := context.WithCancel(parentCtx)
defer cancel()
response := newDeduper()
state := &golistState{
cfg: cfg,
ctx: ctx,
vendorDirs: map[string]bool{},
}
// Fill in response.Sizes asynchronously if necessary.
var sizeserr error
var sizeswg sync.WaitGroup
if cfg.Mode&NeedTypesSizes != 0 || cfg.Mode&NeedTypes != 0 {
sizeswg.Add(1)
go func() {
var sizes types.Sizes
sizes, sizeserr = packagesdriver.GetSizesGolist(ctx, state.cfgInvocation(), cfg.gocmdRunner)
// types.SizesFor always returns nil or a *types.StdSizes.
response.dr.Sizes, _ = sizes.(*types.StdSizes)
sizeswg.Done()
}()
}
// Determine files requested in contains patterns
var containFiles []string
restPatterns := make([]string, 0, len(patterns))
// Extract file= and other [querytype]= patterns. Report an error if querytype
// doesn't exist.
extractQueries:
for _, pattern := range patterns {
eqidx := strings.Index(pattern, "=")
if eqidx < 0 {
restPatterns = append(restPatterns, pattern)
} else {
query, value := pattern[:eqidx], pattern[eqidx+len("="):]
switch query {
case "file":
containFiles = append(containFiles, value)
case "pattern":
restPatterns = append(restPatterns, value)
case "": // not a reserved query
restPatterns = append(restPatterns, pattern)
default:
for _, rune := range query {
if rune < 'a' || rune > 'z' { // not a reserved query
restPatterns = append(restPatterns, pattern)
continue extractQueries
}
}
// Reject all other patterns containing "="
return nil, fmt.Errorf("invalid query type %q in query pattern %q", query, pattern)
}
}
}
// See if we have any patterns to pass through to go list. Zero initial
// patterns also requires a go list call, since it's the equivalent of
// ".".
if len(restPatterns) > 0 || len(patterns) == 0 {
dr, err := state.createDriverResponse(restPatterns...)
if err != nil {
return nil, err
}
response.addAll(dr)
}
if len(containFiles) != 0 {
if err := state.runContainsQueries(response, containFiles); err != nil {
return nil, err
}
}
// Only use go/packages' overlay processing if we're using a Go version
// below 1.16. Otherwise, go list handles it.
if goVersion, err := state.getGoVersion(); err == nil && goVersion < 16 {
modifiedPkgs, needPkgs, err := state.processGolistOverlay(response)
if err != nil {
return nil, err
}
var containsCandidates []string
if len(containFiles) > 0 {
containsCandidates = append(containsCandidates, modifiedPkgs...)
containsCandidates = append(containsCandidates, needPkgs...)
}
if err := state.addNeededOverlayPackages(response, needPkgs); err != nil {
return nil, err
}
// Check candidate packages for containFiles.
if len(containFiles) > 0 {
for _, id := range containsCandidates {
pkg, ok := response.seenPackages[id]
if !ok {
response.addPackage(&Package{
ID: id,
Errors: []Error{{
Kind: ListError,
Msg: fmt.Sprintf("package %s expected but not seen", id),
}},
})
continue
}
for _, f := range containFiles {
for _, g := range pkg.GoFiles {
if sameFile(f, g) {
response.addRoot(id)
}
}
}
}
}
// Add root for any package that matches a pattern. This applies only to
// packages that are modified by overlays, since they are not added as
// roots automatically.
for _, pattern := range restPatterns {
match := matchPattern(pattern)
for _, pkgID := range modifiedPkgs {
pkg, ok := response.seenPackages[pkgID]
if !ok {
continue
}
if match(pkg.PkgPath) {
response.addRoot(pkg.ID)
}
}
}
}
sizeswg.Wait()
if sizeserr != nil {
return nil, sizeserr
}
return response.dr, nil
}
func (state *golistState) addNeededOverlayPackages(response *responseDeduper, pkgs []string) error {
if len(pkgs) == 0 {
return nil
}
dr, err := state.createDriverResponse(pkgs...)
if err != nil {
return err
}
for _, pkg := range dr.Packages {
response.addPackage(pkg)
}
_, needPkgs, err := state.processGolistOverlay(response)
if err != nil {
return err
}
return state.addNeededOverlayPackages(response, needPkgs)
}
func (state *golistState) runContainsQueries(response *responseDeduper, queries []string) error {
for _, query := range queries {
// TODO(matloob): Do only one query per directory.
fdir := filepath.Dir(query)
// Pass absolute path of directory to go list so that it knows to treat it as a directory,
// not a package path.
pattern, err := filepath.Abs(fdir)
if err != nil {
return fmt.Errorf("could not determine absolute path of file= query path %q: %v", query, err)
}
dirResponse, err := state.createDriverResponse(pattern)
// If there was an error loading the package, or the package is returned
// with errors, try to load the file as an ad-hoc package.
// Usually the error will appear in a returned package, but may not if we're
// in module mode and the ad-hoc is located outside a module.
if err != nil || len(dirResponse.Packages) == 1 && len(dirResponse.Packages[0].GoFiles) == 0 &&
len(dirResponse.Packages[0].Errors) == 1 {
var queryErr error
if dirResponse, queryErr = state.adhocPackage(pattern, query); queryErr != nil {
return err // return the original error
}
}
isRoot := make(map[string]bool, len(dirResponse.Roots))
for _, root := range dirResponse.Roots {
isRoot[root] = true
}
for _, pkg := range dirResponse.Packages {
// Add any new packages to the main set
// We don't bother to filter packages that will be dropped by the changes of roots,
// that will happen anyway during graph construction outside this function.
// Over-reporting packages is not a problem.
response.addPackage(pkg)
// if the package was not a root one, it cannot have the file
if !isRoot[pkg.ID] {
continue
}
for _, pkgFile := range pkg.GoFiles {
if filepath.Base(query) == filepath.Base(pkgFile) {
response.addRoot(pkg.ID)
break
}
}
}
}
return nil
}
// adhocPackage attempts to load or construct an ad-hoc package for a given
// query, if the original call to the driver produced inadequate results.
func (state *golistState) adhocPackage(pattern, query string) (*driverResponse, error) {
response, err := state.createDriverResponse(query)
if err != nil {
return nil, err
}
// If we get nothing back from `go list`,
// try to make this file into its own ad-hoc package.
// TODO(rstambler): Should this check against the original response?
if len(response.Packages) == 0 {
response.Packages = append(response.Packages, &Package{
ID: "command-line-arguments",
PkgPath: query,
GoFiles: []string{query},
CompiledGoFiles: []string{query},
Imports: make(map[string]*Package),
})
response.Roots = append(response.Roots, "command-line-arguments")
}
// Handle special cases.
if len(response.Packages) == 1 {
// golang/go#33482: If this is a file= query for ad-hoc packages where
// the file only exists on an overlay, and exists outside of a module,
// add the file to the package and remove the errors.
if response.Packages[0].ID == "command-line-arguments" ||
filepath.ToSlash(response.Packages[0].PkgPath) == filepath.ToSlash(query) {
if len(response.Packages[0].GoFiles) == 0 {
filename := filepath.Join(pattern, filepath.Base(query)) // avoid recomputing abspath
// TODO(matloob): check if the file is outside of a root dir?
for path := range state.cfg.Overlay {
if path == filename {
response.Packages[0].Errors = nil
response.Packages[0].GoFiles = []string{path}
response.Packages[0].CompiledGoFiles = []string{path}
}
}
}
}
}
return response, nil
}
// Fields must match go list;
// see $GOROOT/src/cmd/go/internal/load/pkg.go.
type jsonPackage struct {
ImportPath string
Dir string
Name string
Export string
GoFiles []string
CompiledGoFiles []string
IgnoredGoFiles []string
IgnoredOtherFiles []string
CFiles []string
CgoFiles []string
CXXFiles []string
MFiles []string
HFiles []string
FFiles []string
SFiles []string
SwigFiles []string
SwigCXXFiles []string
SysoFiles []string
Imports []string
ImportMap map[string]string
Deps []string
Module *Module
TestGoFiles []string
TestImports []string
XTestGoFiles []string
XTestImports []string
ForTest string // q in a "p [q.test]" package, else ""
DepOnly bool
Error *packagesinternal.PackageError
DepsErrors []*packagesinternal.PackageError
}
type jsonPackageError struct {
ImportStack []string
Pos string
Err string
}
func otherFiles(p *jsonPackage) [][]string {
return [][]string{p.CFiles, p.CXXFiles, p.MFiles, p.HFiles, p.FFiles, p.SFiles, p.SwigFiles, p.SwigCXXFiles, p.SysoFiles}
}
// createDriverResponse uses the "go list" command to expand the pattern
// words and return a response for the specified packages.
func (state *golistState) createDriverResponse(words ...string) (*driverResponse, error) {
// go list uses the following identifiers in ImportPath and Imports:
//
// "p" -- importable package or main (command)
// "q.test" -- q's test executable
// "p [q.test]" -- variant of p as built for q's test executable
// "q_test [q.test]" -- q's external test package
//
// The packages p that are built differently for a test q.test
// are q itself, plus any helpers used by the external test q_test,
// typically including "testing" and all its dependencies.
// Run "go list" for complete
// information on the specified packages.
buf, err := state.invokeGo("list", golistargs(state.cfg, words)...)
if err != nil {
return nil, err
}
seen := make(map[string]*jsonPackage)
pkgs := make(map[string]*Package)
additionalErrors := make(map[string][]Error)
// Decode the JSON and convert it to Package form.
var response driverResponse
for dec := json.NewDecoder(buf); dec.More(); {
p := new(jsonPackage)
if err := dec.Decode(p); err != nil {
return nil, fmt.Errorf("JSON decoding failed: %v", err)
}
if p.ImportPath == "" {
// The documentation for go list says that “[e]rroneous packages will have
// a non-empty ImportPath”. If for some reason it comes back empty, we
// prefer to error out rather than silently discarding data or handing
// back a package without any way to refer to it.
if p.Error != nil {
return nil, Error{
Pos: p.Error.Pos,
Msg: p.Error.Err,
}
}
return nil, fmt.Errorf("package missing import path: %+v", p)
}
// Work around https://golang.org/issue/33157:
// go list -e, when given an absolute path, will find the package contained at
// that directory. But when no package exists there, it will return a fake package
// with an error and the ImportPath set to the absolute path provided to go list.
// Try to convert that absolute path to what its package path would be if it's
// contained in a known module or GOPATH entry. This will allow the package to be
// properly "reclaimed" when overlays are processed.
if filepath.IsAbs(p.ImportPath) && p.Error != nil {
pkgPath, ok, err := state.getPkgPath(p.ImportPath)
if err != nil {
return nil, err
}
if ok {
p.ImportPath = pkgPath
}
}
if old, found := seen[p.ImportPath]; found {
// If one version of the package has an error, and the other doesn't, assume
// that this is a case where go list is reporting a fake dependency variant
// of the imported package: When a package tries to invalidly import another
// package, go list emits a variant of the imported package (with the same
// import path, but with an error on it, and the package will have a
// DepError set on it). An example of when this can happen is for imports of
// main packages: main packages can not be imported, but they may be
// separately matched and listed by another pattern.
// See golang.org/issue/36188 for more details.
// The plan is that eventually, hopefully in Go 1.15, the error will be
// reported on the importing package rather than the duplicate "fake"
// version of the imported package. Once all supported versions of Go
// have the new behavior this logic can be deleted.
// TODO(matloob): delete the workaround logic once all supported versions of
// Go return the errors on the proper package.
// There should be exactly one version of a package that doesn't have an
// error.
if old.Error == nil && p.Error == nil {
if !reflect.DeepEqual(p, old) {
return nil, fmt.Errorf("internal error: go list gives conflicting information for package %v", p.ImportPath)
}
continue
}
// Determine if this package's error needs to be bubbled up.
// This is a hack, and we expect for go list to eventually set the error
// on the package.
if old.Error != nil {
var errkind string
if strings.Contains(old.Error.Err, "not an importable package") {
errkind = "not an importable package"
} else if strings.Contains(old.Error.Err, "use of internal package") && strings.Contains(old.Error.Err, "not allowed") {
errkind = "use of internal package not allowed"
}
if errkind != "" {
if len(old.Error.ImportStack) < 1 {
return nil, fmt.Errorf(`internal error: go list gave a %q error with empty import stack`, errkind)
}
importingPkg := old.Error.ImportStack[len(old.Error.ImportStack)-1]
if importingPkg == old.ImportPath {
// Using an older version of Go which put this package itself on top of import
// stack, instead of the importer. Look for importer in second from top
// position.
if len(old.Error.ImportStack) < 2 {
return nil, fmt.Errorf(`internal error: go list gave a %q error with an import stack without importing package`, errkind)
}
importingPkg = old.Error.ImportStack[len(old.Error.ImportStack)-2]
}
additionalErrors[importingPkg] = append(additionalErrors[importingPkg], Error{
Pos: old.Error.Pos,
Msg: old.Error.Err,
Kind: ListError,
})
}
}
// Make sure that if there's a version of the package without an error,
// that's the one reported to the user.
if old.Error == nil {
continue
}
// This package will replace the old one at the end of the loop.
}
seen[p.ImportPath] = p
pkg := &Package{
Name: p.Name,
ID: p.ImportPath,
GoFiles: absJoin(p.Dir, p.GoFiles, p.CgoFiles),
CompiledGoFiles: absJoin(p.Dir, p.CompiledGoFiles),
OtherFiles: absJoin(p.Dir, otherFiles(p)...),
IgnoredFiles: absJoin(p.Dir, p.IgnoredGoFiles, p.IgnoredOtherFiles),
forTest: p.ForTest,
depsErrors: p.DepsErrors,
Module: p.Module,
}
if (state.cfg.Mode&typecheckCgo) != 0 && len(p.CgoFiles) != 0 {
if len(p.CompiledGoFiles) > len(p.GoFiles) {
// We need the cgo definitions, which are in the first
// CompiledGoFile after the non-cgo ones. This is a hack but there
// isn't currently a better way to find it. We also need the pure
// Go files and unprocessed cgo files, all of which are already
// in pkg.GoFiles.
cgoTypes := p.CompiledGoFiles[len(p.GoFiles)]
pkg.CompiledGoFiles = append([]string{cgoTypes}, pkg.GoFiles...)
} else {
// golang/go#38990: go list silently fails to do cgo processing
pkg.CompiledGoFiles = nil
pkg.Errors = append(pkg.Errors, Error{
Msg: "go list failed to return CompiledGoFiles. This may indicate failure to perform cgo processing; try building at the command line. See https://golang.org/issue/38990.",
Kind: ListError,
})
}
}
// Work around https://golang.org/issue/28749:
// cmd/go puts assembly, C, and C++ files in CompiledGoFiles.
// Filter out any elements of CompiledGoFiles that are also in OtherFiles.
// We have to keep this workaround in place until go1.12 is a distant memory.
if len(pkg.OtherFiles) > 0 {
other := make(map[string]bool, len(pkg.OtherFiles))
for _, f := range pkg.OtherFiles {
other[f] = true
}
out := pkg.CompiledGoFiles[:0]
for _, f := range pkg.CompiledGoFiles {
if other[f] {
continue
}
out = append(out, f)
}
pkg.CompiledGoFiles = out
}
// Extract the PkgPath from the package's ID.
if i := strings.IndexByte(pkg.ID, ' '); i >= 0 {
pkg.PkgPath = pkg.ID[:i]
} else {
pkg.PkgPath = pkg.ID
}
if pkg.PkgPath == "unsafe" {
pkg.GoFiles = nil // ignore fake unsafe.go file
}
// Assume go list emits only absolute paths for Dir.
if p.Dir != "" && !filepath.IsAbs(p.Dir) {
log.Fatalf("internal error: go list returned non-absolute Package.Dir: %s", p.Dir)
}
if p.Export != "" && !filepath.IsAbs(p.Export) {
pkg.ExportFile = filepath.Join(p.Dir, p.Export)
} else {
pkg.ExportFile = p.Export
}
// imports
//
// Imports contains the IDs of all imported packages.
// ImportsMap records (path, ID) only where they differ.
ids := make(map[string]bool)
for _, id := range p.Imports {
ids[id] = true
}
pkg.Imports = make(map[string]*Package)
for path, id := range p.ImportMap {
pkg.Imports[path] = &Package{ID: id} // non-identity import
delete(ids, id)
}
for id := range ids {
if id == "C" {
continue
}
pkg.Imports[id] = &Package{ID: id} // identity import
}
if !p.DepOnly {
response.Roots = append(response.Roots, pkg.ID)
}
// Work around for pre-go.1.11 versions of go list.
// TODO(matloob): they should be handled by the fallback.
// Can we delete this?
if len(pkg.CompiledGoFiles) == 0 {
pkg.CompiledGoFiles = pkg.GoFiles
}
// Temporary work-around for golang/go#39986. Parse filenames out of
// error messages. This happens if there are unrecoverable syntax
// errors in the source, so we can't match on a specific error message.
if err := p.Error; err != nil && state.shouldAddFilenameFromError(p) {
addFilenameFromPos := func(pos string) bool {
split := strings.Split(pos, ":")
if len(split) < 1 {
return false
}
filename := strings.TrimSpace(split[0])
if filename == "" {
return false
}
if !filepath.IsAbs(filename) {
filename = filepath.Join(state.cfg.Dir, filename)
}
info, _ := os.Stat(filename)
if info == nil {
return false
}
pkg.CompiledGoFiles = append(pkg.CompiledGoFiles, filename)
pkg.GoFiles = append(pkg.GoFiles, filename)
return true
}
found := addFilenameFromPos(err.Pos)
// In some cases, go list only reports the error position in the
// error text, not the error position. One such case is when the
// file's package name is a keyword (see golang.org/issue/39763).
if !found {
addFilenameFromPos(err.Err)
}
}
if p.Error != nil {
msg := strings.TrimSpace(p.Error.Err) // Trim to work around golang.org/issue/32363.
// Address golang.org/issue/35964 by appending import stack to error message.
if msg == "import cycle not allowed" && len(p.Error.ImportStack) != 0 {
msg += fmt.Sprintf(": import stack: %v", p.Error.ImportStack)
}
pkg.Errors = append(pkg.Errors, Error{
Pos: p.Error.Pos,
Msg: msg,
Kind: ListError,
})
}
pkgs[pkg.ID] = pkg
}
for id, errs := range additionalErrors {
if p, ok := pkgs[id]; ok {
p.Errors = append(p.Errors, errs...)
}
}
for _, pkg := range pkgs {
response.Packages = append(response.Packages, pkg)
}
sort.Slice(response.Packages, func(i, j int) bool { return response.Packages[i].ID < response.Packages[j].ID })
return &response, nil
}
func (state *golistState) shouldAddFilenameFromError(p *jsonPackage) bool {
if len(p.GoFiles) > 0 || len(p.CompiledGoFiles) > 0 {
return false
}
goV, err := state.getGoVersion()
if err != nil {
return false
}
// On Go 1.14 and earlier, only add filenames from errors if the import stack is empty.
// The import stack behaves differently for these versions than newer Go versions.
if goV < 15 {
return len(p.Error.ImportStack) == 0
}
// On Go 1.15 and later, only parse filenames out of error if there's no import stack,
// or the current package is at the top of the import stack. This is not guaranteed
// to work perfectly, but should avoid some cases where files in errors don't belong to this
// package.
return len(p.Error.ImportStack) == 0 || p.Error.ImportStack[len(p.Error.ImportStack)-1] == p.ImportPath
}
func (state *golistState) getGoVersion() (int, error) {
state.goVersionOnce.Do(func() {
state.goVersion, state.goVersionError = gocommand.GoVersion(state.ctx, state.cfgInvocation(), state.cfg.gocmdRunner)
})
return state.goVersion, state.goVersionError
}
// getPkgPath finds the package path of a directory if it's relative to a root
// directory.
func (state *golistState) getPkgPath(dir string) (string, bool, error) {
absDir, err := filepath.Abs(dir)
if err != nil {
return "", false, err
}
roots, err := state.determineRootDirs()
if err != nil {
return "", false, err
}
for rdir, rpath := range roots {
// Make sure that the directory is in the module,
// to avoid creating a path relative to another module.
if !strings.HasPrefix(absDir, rdir) {
continue
}
// TODO(matloob): This doesn't properly handle symlinks.
r, err := filepath.Rel(rdir, dir)
if err != nil {
continue
}
if rpath != "" {
// We choose only one root even though the directory even it can belong in multiple modules
// or GOPATH entries. This is okay because we only need to work with absolute dirs when a
// file is missing from disk, for instance when gopls calls go/packages in an overlay.
// Once the file is saved, gopls, or the next invocation of the tool will get the correct
// result straight from golist.
// TODO(matloob): Implement module tiebreaking?
return path.Join(rpath, filepath.ToSlash(r)), true, nil
}
return filepath.ToSlash(r), true, nil
}
return "", false, nil
}
// absJoin absolutizes and flattens the lists of files.
func absJoin(dir string, fileses ...[]string) (res []string) {
for _, files := range fileses {
for _, file := range files {
if !filepath.IsAbs(file) {
file = filepath.Join(dir, file)
}
res = append(res, file)
}
}
return res
}
func golistargs(cfg *Config, words []string) []string {
const findFlags = NeedImports | NeedTypes | NeedSyntax | NeedTypesInfo
fullargs := []string{
"-e", "-json",
fmt.Sprintf("-compiled=%t", cfg.Mode&(NeedCompiledGoFiles|NeedSyntax|NeedTypes|NeedTypesInfo|NeedTypesSizes) != 0),
fmt.Sprintf("-test=%t", cfg.Tests),
fmt.Sprintf("-export=%t", usesExportData(cfg)),
fmt.Sprintf("-deps=%t", cfg.Mode&NeedImports != 0),
// go list doesn't let you pass -test and -find together,
// probably because you'd just get the TestMain.
fmt.Sprintf("-find=%t", !cfg.Tests && cfg.Mode&findFlags == 0),
}
fullargs = append(fullargs, cfg.BuildFlags...)
fullargs = append(fullargs, "--")
fullargs = append(fullargs, words...)
return fullargs
}
// cfgInvocation returns an Invocation that reflects cfg's settings.
func (state *golistState) cfgInvocation() gocommand.Invocation {
cfg := state.cfg
return gocommand.Invocation{
BuildFlags: cfg.BuildFlags,
ModFile: cfg.modFile,
ModFlag: cfg.modFlag,
CleanEnv: cfg.Env != nil,
Env: cfg.Env,
Logf: cfg.Logf,
WorkingDir: cfg.Dir,
}
}
// invokeGo returns the stdout of a go command invocation.
func (state *golistState) invokeGo(verb string, args ...string) (*bytes.Buffer, error) {
cfg := state.cfg
inv := state.cfgInvocation()
// For Go versions 1.16 and above, `go list` accepts overlays directly via
// the -overlay flag. Set it, if it's available.
//
// The check for "list" is not necessarily required, but we should avoid
// getting the go version if possible.
if verb == "list" {
goVersion, err := state.getGoVersion()
if err != nil {
return nil, err
}
if goVersion >= 16 {
filename, cleanup, err := state.writeOverlays()
if err != nil {
return nil, err
}
defer cleanup()
inv.Overlay = filename
}
}
inv.Verb = verb
inv.Args = args
gocmdRunner := cfg.gocmdRunner
if gocmdRunner == nil {
gocmdRunner = &gocommand.Runner{}
}
stdout, stderr, friendlyErr, err := gocmdRunner.RunRaw(cfg.Context, inv)
if err != nil {
// Check for 'go' executable not being found.
if ee, ok := err.(*exec.Error); ok && ee.Err == exec.ErrNotFound {
return nil, fmt.Errorf("'go list' driver requires 'go', but %s", exec.ErrNotFound)
}
exitErr, ok := err.(*exec.ExitError)
if !ok {
// Catastrophic error:
// - context cancellation
return nil, xerrors.Errorf("couldn't run 'go': %w", err)
}
// Old go version?
if strings.Contains(stderr.String(), "flag provided but not defined") {
return nil, goTooOldError{fmt.Errorf("unsupported version of go: %s: %s", exitErr, stderr)}
}
// Related to #24854
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "unexpected directory layout") {
return nil, friendlyErr
}
// Is there an error running the C compiler in cgo? This will be reported in the "Error" field
// and should be suppressed by go list -e.
//
// This condition is not perfect yet because the error message can include other error messages than runtime/cgo.
isPkgPathRune := func(r rune) bool {
// From https://golang.org/ref/spec#Import_declarations:
// Implementation restriction: A compiler may restrict ImportPaths to non-empty strings
// using only characters belonging to Unicode's L, M, N, P, and S general categories
// (the Graphic characters without spaces) and may also exclude the
// characters !"#$%&'()*,:;<=>?[\]^`{|} and the Unicode replacement character U+FFFD.
return unicode.IsOneOf([]*unicode.RangeTable{unicode.L, unicode.M, unicode.N, unicode.P, unicode.S}, r) &&
!strings.ContainsRune("!\"#$%&'()*,:;<=>?[\\]^`{|}\uFFFD", r)
}
// golang/go#36770: Handle case where cmd/go prints module download messages before the error.
msg := stderr.String()
for strings.HasPrefix(msg, "go: downloading") {
msg = msg[strings.IndexRune(msg, '\n')+1:]
}
if len(stderr.String()) > 0 && strings.HasPrefix(stderr.String(), "# ") {
msg := msg[len("# "):]
if strings.HasPrefix(strings.TrimLeftFunc(msg, isPkgPathRune), "\n") {
return stdout, nil
}
// Treat pkg-config errors as a special case (golang.org/issue/36770).
if strings.HasPrefix(msg, "pkg-config") {
return stdout, nil
}
}
// This error only appears in stderr. See golang.org/cl/166398 for a fix in go list to show
// the error in the Err section of stdout in case -e option is provided.
// This fix is provided for backwards compatibility.
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "named files must be .go files") {
output := fmt.Sprintf(`{"ImportPath": "command-line-arguments","Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
strings.Trim(stderr.String(), "\n"))
return bytes.NewBufferString(output), nil
}
// Similar to the previous error, but currently lacks a fix in Go.
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "named files must all be in one directory") {
output := fmt.Sprintf(`{"ImportPath": "command-line-arguments","Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
strings.Trim(stderr.String(), "\n"))
return bytes.NewBufferString(output), nil
}
// Backwards compatibility for Go 1.11 because 1.12 and 1.13 put the directory in the ImportPath.
// If the package doesn't exist, put the absolute path of the directory into the error message,
// as Go 1.13 list does.
const noSuchDirectory = "no such directory"
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), noSuchDirectory) {
errstr := stderr.String()
abspath := strings.TrimSpace(errstr[strings.Index(errstr, noSuchDirectory)+len(noSuchDirectory):])
output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
abspath, strings.Trim(stderr.String(), "\n"))
return bytes.NewBufferString(output), nil
}
// Workaround for #29280: go list -e has incorrect behavior when an ad-hoc package doesn't exist.
// Note that the error message we look for in this case is different that the one looked for above.
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "no such file or directory") {
output := fmt.Sprintf(`{"ImportPath": "command-line-arguments","Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
strings.Trim(stderr.String(), "\n"))
return bytes.NewBufferString(output), nil
}
// Workaround for #34273. go list -e with GO111MODULE=on has incorrect behavior when listing a
// directory outside any module.
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "outside available modules") {
output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
// TODO(matloob): command-line-arguments isn't correct here.
"command-line-arguments", strings.Trim(stderr.String(), "\n"))
return bytes.NewBufferString(output), nil
}
// Another variation of the previous error
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "outside module root") {
output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
// TODO(matloob): command-line-arguments isn't correct here.
"command-line-arguments", strings.Trim(stderr.String(), "\n"))
return bytes.NewBufferString(output), nil
}
// Workaround for an instance of golang.org/issue/26755: go list -e will return a non-zero exit
// status if there's a dependency on a package that doesn't exist. But it should return
// a zero exit status and set an error on that package.
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "no Go files in") {
// Don't clobber stdout if `go list` actually returned something.
if len(stdout.String()) > 0 {
return stdout, nil
}
// try to extract package name from string
stderrStr := stderr.String()
var importPath string
colon := strings.Index(stderrStr, ":")
if colon > 0 && strings.HasPrefix(stderrStr, "go build ") {
importPath = stderrStr[len("go build "):colon]
}
output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
importPath, strings.Trim(stderrStr, "\n"))
return bytes.NewBufferString(output), nil
}
// Export mode entails a build.
// If that build fails, errors appear on stderr
// (despite the -e flag) and the Export field is blank.
// Do not fail in that case.