-b31fbf7d8f23508cfbd578c5c44b13eefd8f359e
+89fbf55a409d37ae898e5c4ea4250035f86bed1b
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.
-edea4a79e8d7dea2456b688f492c8af33d381dc2
+96745b980cfde139e8611772e2bc0c59a8e6cdf7
The first line of this file holds the git revision number of the
last merge done from the master library sources.
// The "go get" command remains permitted to update go.mod even with -mod=readonly,
// and the "go mod" commands do not take the -mod flag (or any other build flags).
//
-// If invoked with -mod=vendor, the go command assumes that the vendor
-// directory holds the correct copies of dependencies and ignores
-// the dependency descriptions in go.mod.
+// If invoked with -mod=vendor, the go command loads packages from the main
+// module's vendor directory instead of downloading modules to and loading packages
+// from the module cache. The go command assumes the vendor directory holds
+// correct copies of dependencies, and it does not compute the set of required
+// module versions from go.mod files. However, the go command does check that
+// vendor/modules.txt (generated by 'go mod vendor') contains metadata consistent
+// with go.mod.
//
// If invoked with -mod=mod, the go command loads modules from the module cache
// even if there is a vendor directory present.
//
+// If the go command is not invoked with a -mod flag and the vendor directory
+// is present and the "go" version in go.mod is 1.14 or higher, the go command
+// will act as if it were invoked with -mod=vendor.
+//
// Pseudo-versions
//
// The go.mod file and the go command more generally use semantic versions as
//
// Modules and vendoring
//
-// When using modules, the go command completely ignores vendor directories.
-//
-// By default, the go command satisfies dependencies by downloading modules
-// from their sources and using those downloaded copies (after verification,
-// as described in the previous section). To allow interoperation with older
-// versions of Go, or to ensure that all files used for a build are stored
-// together in a single file tree, 'go mod vendor' creates a directory named
-// vendor in the root directory of the main module and stores there all the
-// packages from dependency modules that are needed to support builds and
-// tests of packages in the main module.
-//
-// To build using the main module's top-level vendor directory to satisfy
-// dependencies (disabling use of the usual network sources and local
-// caches), use 'go build -mod=vendor'. Note that only the main module's
-// top-level vendor directory is used; vendor directories in other locations
-// are still ignored.
+// When using modules, the go command typically satisfies dependencies by
+// downloading modules from their sources and using those downloaded copies
+// (after verification, as described in the previous section). Vendoring may
+// be used to allow interoperation with older versions of Go, or to ensure
+// that all files used for a build are stored together in a single file tree.
+//
+// The command 'go mod vendor' constructs a directory named vendor in the main
+// module's root directory that contains copies of all packages needed to support
+// builds and tests of packages in the main module. 'go mod vendor' also
+// creates the file vendor/modules.txt that contains metadata about vendored
+// packages and module versions. This file should be kept consistent with go.mod:
+// when vendoring is used, 'go mod vendor' should be run after go.mod is updated.
+//
+// If the vendor directory is present in the main module's root directory, it will
+// be used automatically if the "go" version in the main module's go.mod file is
+// 1.14 or higher. Build commands like 'go build' and 'go test' will load packages
+// from the vendor directory instead of accessing the network or the local module
+// cache. To explicitly enable vendoring, invoke the go command with the flag
+// -mod=vendor. To disable vendoring, use the flag -mod=mod.
+//
+// Unlike vendoring in GOPATH, the go command ignores vendor directories in
+// locations other than the main module's root directory.
//
//
// Module authentication using go.sum
import (
"bytes"
+ "errors"
"fmt"
"io/ioutil"
"os"
_, zipErr = os.Stat(zip)
}
dir, dirErr := modfetch.DownloadDir(mod)
- if dirErr == nil {
- _, dirErr = os.Stat(dir)
- }
data, err := ioutil.ReadFile(zip + "hash")
if err != nil {
- if zipErr != nil && os.IsNotExist(zipErr) && dirErr != nil && os.IsNotExist(dirErr) {
+ if zipErr != nil && errors.Is(zipErr, os.ErrNotExist) &&
+ dirErr != nil && errors.Is(dirErr, os.ErrNotExist) {
// Nothing downloaded yet. Nothing to verify.
return true
}
}
h := string(bytes.TrimSpace(data))
- if zipErr != nil && os.IsNotExist(zipErr) {
+ if zipErr != nil && errors.Is(zipErr, os.ErrNotExist) {
// ok
} else {
hZ, err := dirhash.HashZip(zip, dirhash.DefaultHash)
ok = false
}
}
- if dirErr != nil && os.IsNotExist(dirErr) {
+ if dirErr != nil && errors.Is(dirErr, os.ErrNotExist) {
// ok
} else {
hD, err := dirhash.HashDir(dir, mod.Path+"@"+mod.Version, dirhash.DefaultHash)
import (
"bytes"
"encoding/json"
+ "errors"
"fmt"
"io"
"io/ioutil"
return filepath.Join(dir, encVer+"."+suffix), nil
}
-// DownloadDir returns the directory to which m should be downloaded.
-// Note that the directory may not yet exist.
+// DownloadDir returns the directory to which m should have been downloaded.
+// An error will be returned if the module path or version cannot be escaped.
+// An error satisfying errors.Is(err, os.ErrNotExist) will be returned
+// along with the directory if the directory does not exist or if the directory
+// is not completely populated.
func DownloadDir(m module.Version) (string, error) {
if PkgMod == "" {
return "", fmt.Errorf("internal error: modfetch.PkgMod not set")
if err != nil {
return "", err
}
- return filepath.Join(PkgMod, enc+"@"+encVer), nil
+
+ dir := filepath.Join(PkgMod, enc+"@"+encVer)
+ if fi, err := os.Stat(dir); os.IsNotExist(err) {
+ return dir, err
+ } else if err != nil {
+ return dir, &DownloadDirPartialError{dir, err}
+ } else if !fi.IsDir() {
+ return dir, &DownloadDirPartialError{dir, errors.New("not a directory")}
+ }
+ partialPath, err := CachePath(m, "partial")
+ if err != nil {
+ return dir, err
+ }
+ if _, err := os.Stat(partialPath); err == nil {
+ return dir, &DownloadDirPartialError{dir, errors.New("not completely extracted")}
+ } else if !os.IsNotExist(err) {
+ return dir, err
+ }
+ return dir, nil
+}
+
+// DownloadDirPartialError is returned by DownloadDir if a module directory
+// exists but was not completely populated.
+//
+// DownloadDirPartialError is equivalent to os.ErrNotExist.
+type DownloadDirPartialError struct {
+ Dir string
+ Err error
}
+func (e *DownloadDirPartialError) Error() string { return fmt.Sprintf("%s: %v", e.Dir, e.Err) }
+func (e *DownloadDirPartialError) Is(err error) bool { return err == os.ErrNotExist }
+
// lockVersion locks a file within the module cache that guards the downloading
// and extraction of the zipfile for the given module version.
func lockVersion(mod module.Version) (unlock func(), err error) {
"cmd/go/internal/lockedfile"
"cmd/go/internal/par"
"cmd/go/internal/renameio"
+ "cmd/go/internal/robustio"
"golang.org/x/mod/module"
"golang.org/x/mod/sumdb/dirhash"
err error
}
c := downloadCache.Do(mod, func() interface{} {
- dir, err := DownloadDir(mod)
+ dir, err := download(mod)
if err != nil {
return cached{"", err}
}
- if err := download(mod, dir); err != nil {
- return cached{"", err}
- }
checkMod(mod)
return cached{dir, nil}
}).(cached)
return c.dir, c.err
}
-func download(mod module.Version, dir string) (err error) {
- // If the directory exists, the module has already been extracted.
- fi, err := os.Stat(dir)
- if err == nil && fi.IsDir() {
- return nil
+func download(mod module.Version) (dir string, err error) {
+ // If the directory exists, and no .partial file exists,
+ // the module has already been completely extracted.
+ // .partial files may be created when future versions of cmd/go
+ // extract module zip directories in place instead of extracting
+ // to a random temporary directory and renaming.
+ dir, err = DownloadDir(mod)
+ if err == nil {
+ return dir, nil
+ } else if dir == "" || !errors.Is(err, os.ErrNotExist) {
+ return "", err
}
// To avoid cluttering the cache with extraneous files,
// Invoke DownloadZip before locking the file.
zipfile, err := DownloadZip(mod)
if err != nil {
- return err
+ return "", err
}
unlock, err := lockVersion(mod)
if err != nil {
- return err
+ return "", err
}
defer unlock()
// Check whether the directory was populated while we were waiting on the lock.
- fi, err = os.Stat(dir)
- if err == nil && fi.IsDir() {
- return nil
+ _, dirErr := DownloadDir(mod)
+ if dirErr == nil {
+ return dir, nil
}
+ _, dirExists := dirErr.(*DownloadDirPartialError)
- // Clean up any remaining temporary directories from previous runs.
+ // Clean up any remaining temporary directories from previous runs, as well
+ // as partially extracted diectories created by future versions of cmd/go.
// This is only safe to do because the lock file ensures that their writers
// are no longer active.
parentDir := filepath.Dir(dir)
RemoveAll(path) // best effort
}
}
+ if dirExists {
+ if err := RemoveAll(dir); err != nil {
+ return "", err
+ }
+ }
+
+ partialPath, err := CachePath(mod, "partial")
+ if err != nil {
+ return "", err
+ }
+ if err := os.Remove(partialPath); err != nil && !os.IsNotExist(err) {
+ return "", err
+ }
// Extract the zip file to a temporary directory, then rename it to the
// final path. That way, we can use the existence of the source directory to
// the entire directory (e.g. as an attempt to prune out file corruption)
// the module cache will still be left in a recoverable state.
if err := os.MkdirAll(parentDir, 0777); err != nil {
- return err
+ return "", err
}
tmpDir, err := ioutil.TempDir(parentDir, tmpPrefix)
if err != nil {
- return err
+ return "", err
}
defer func() {
if err != nil {
if err := modzip.Unzip(tmpDir, mod, zipfile); err != nil {
fmt.Fprintf(os.Stderr, "-> %s\n", err)
- return err
+ return "", err
}
- if err := os.Rename(tmpDir, dir); err != nil {
- return err
+ if err := robustio.Rename(tmpDir, dir); err != nil {
+ return "", err
}
if !cfg.ModCacheRW {
// os.Rename was observed to fail for read-only directories on macOS.
makeDirsReadOnly(dir)
}
- return nil
+ return dir, nil
}
var downloadZipCache par.Cache
}
dir, err := modfetch.DownloadDir(mod)
if err == nil {
- if info, err := os.Stat(dir); err == nil && info.IsDir() {
- m.Dir = dir
- }
+ m.Dir = dir
}
}
}
The "go get" command remains permitted to update go.mod even with -mod=readonly,
and the "go mod" commands do not take the -mod flag (or any other build flags).
-If invoked with -mod=vendor, the go command assumes that the vendor
-directory holds the correct copies of dependencies and ignores
-the dependency descriptions in go.mod.
+If invoked with -mod=vendor, the go command loads packages from the main
+module's vendor directory instead of downloading modules to and loading packages
+from the module cache. The go command assumes the vendor directory holds
+correct copies of dependencies, and it does not compute the set of required
+module versions from go.mod files. However, the go command does check that
+vendor/modules.txt (generated by 'go mod vendor') contains metadata consistent
+with go.mod.
If invoked with -mod=mod, the go command loads modules from the module cache
even if there is a vendor directory present.
+If the go command is not invoked with a -mod flag and the vendor directory
+is present and the "go" version in go.mod is 1.14 or higher, the go command
+will act as if it were invoked with -mod=vendor.
+
Pseudo-versions
The go.mod file and the go command more generally use semantic versions as
Modules and vendoring
-When using modules, the go command completely ignores vendor directories.
-
-By default, the go command satisfies dependencies by downloading modules
-from their sources and using those downloaded copies (after verification,
-as described in the previous section). To allow interoperation with older
-versions of Go, or to ensure that all files used for a build are stored
-together in a single file tree, 'go mod vendor' creates a directory named
-vendor in the root directory of the main module and stores there all the
-packages from dependency modules that are needed to support builds and
-tests of packages in the main module.
-
-To build using the main module's top-level vendor directory to satisfy
-dependencies (disabling use of the usual network sources and local
-caches), use 'go build -mod=vendor'. Note that only the main module's
-top-level vendor directory is used; vendor directories in other locations
-are still ignored.
+When using modules, the go command typically satisfies dependencies by
+downloading modules from their sources and using those downloaded copies
+(after verification, as described in the previous section). Vendoring may
+be used to allow interoperation with older versions of Go, or to ensure
+that all files used for a build are stored together in a single file tree.
+
+The command 'go mod vendor' constructs a directory named vendor in the main
+module's root directory that contains copies of all packages needed to support
+builds and tests of packages in the main module. 'go mod vendor' also
+creates the file vendor/modules.txt that contains metadata about vendored
+packages and module versions. This file should be kept consistent with go.mod:
+when vendoring is used, 'go mod vendor' should be run after go.mod is updated.
+
+If the vendor directory is present in the main module's root directory, it will
+be used automatically if the "go" version in the main module's go.mod file is
+1.14 or higher. Build commands like 'go build' and 'go test' will load packages
+from the vendor directory instead of accessing the network or the local module
+cache. To explicitly enable vendoring, invoke the go command with the flag
+-mod=vendor. To disable vendoring, use the flag -mod=mod.
+
+Unlike vendoring in GOPATH, the go command ignores vendor directories in
+locations other than the main module's root directory.
`,
}
"time"
)
-const arbitraryTimeout = 500 * time.Millisecond
+const arbitraryTimeout = 2000 * time.Millisecond
// retry retries ephemeral errors from f up to an arbitrary timeout
// to work around filesystem flakiness on Windows and Darwin.
// The bitmask starts at s.startAddr.
// The result must be deallocated with dematerializeGCProg.
func materializeGCProg(ptrdata uintptr, prog *byte) *mspan {
- s := mheap_.allocManual((ptrdata/(8*sys.PtrSize)+pageSize-1)/pageSize, &memstats.gc_sys)
+ // Each word of ptrdata needs one bit in the bitmap.
+ bitmapBytes := divRoundUp(ptrdata, 8*sys.PtrSize)
+ // Compute the number of pages needed for bitmapBytes.
+ pages := divRoundUp(bitmapBytes, pageSize)
+ s := mheap_.allocManual(pages, &memstats.gc_sys)
runGCProg(addb(prog, 4), nil, (*byte)(unsafe.Pointer(s.startAddr)), 1)
return s
}
return n &^ (a - 1)
}
+// divRoundUp returns ceil(n / a).
+func divRoundUp(n, a uintptr) uintptr {
+ // a is generally a power of two. This will get inlined and
+ // the compiler will optimize the division.
+ return (n + a - 1) / a
+}
+
// checkASM returns whether assembly runtime checks have passed.
func checkASM() bool {
return true
projects / gcc.git / commitdiff