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cmd/go: move switch-only code from select.go to switch.go

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Move NewerToolchain and related code from select.go to switch.go
because it is only used for the Switch operation, not for Select.
This is a separate CL containing only the code move, separate
from any other changes.

For #57001.

Change-Id: I41cf0629b41fd55c30a1e799d857c06039ee99b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/500798
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Russ Cox 2023-06-04 22:49:28 -04:00
parent 35268a9960
commit e23273ddd4
2 changed files with 124 additions and 120 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

120
src/cmd/go/internal/toolchain/select.go
View File

@ -16,7 +16,6 @@ import (
"os/exec"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
@ -231,125 +230,6 @@ func Select() {
Exec(gotoolchain)
}
// NewerToolchain returns the name of the toolchain to use when we need
// to switch to a newer toolchain that must support at least the given Go version.
// See https://go.dev/doc/toolchain#switch.
//
// If the latest major release is 1.N.0, we use the latest patch release of 1.(N-1) if that's >= version.
// Otherwise we use the latest 1.N if that's allowed.
// Otherwise we use the latest release.
func NewerToolchain(ctx context.Context, version string) (string, error) {
fetch := autoToolchains
if !HasAuto() {
fetch = pathToolchains
}
list, err := fetch(ctx)
if err != nil {
return "", err
}
return newerToolchain(version, list)
}
// autoToolchains returns the list of toolchain versions available to GOTOOLCHAIN=auto or =min+auto mode.
func autoToolchains(ctx context.Context) ([]string, error) {
var versions *modfetch.Versions
err := modfetch.TryProxies(func(proxy string) error {
v, err := modfetch.Lookup(ctx, proxy, "go").Versions(ctx, "")
if err != nil {
return err
}
versions = v
return nil
})
if err != nil {
return nil, err
}
return versions.List, nil
}
// pathToolchains returns the list of toolchain versions available to GOTOOLCHAIN=path or =min+path mode.
func pathToolchains(ctx context.Context) ([]string, error) {
have := make(map[string]bool)
var list []string
for _, dir := range pathDirs() {
if dir == "" || !filepath.IsAbs(dir) {
// Refuse to use local directories in $PATH (hard-coding exec.ErrDot).
continue
}
entries, err := os.ReadDir(dir)
if err != nil {
continue
}
for _, de := range entries {
if de.IsDir() || !strings.HasPrefix(de.Name(), "go1.") {
continue
}
info, err := de.Info()
if err != nil {
continue
}
v, ok := pathVersion(dir, de, info)
if !ok || !strings.HasPrefix(v, "1.") || have[v] {
continue
}
have[v] = true
list = append(list, v)
}
}
sort.Slice(list, func(i, j int) bool {
return gover.Compare(list[i], list[j]) < 0
})
return list, nil
}
// newerToolchain implements NewerToolchain where the list of choices is known.
// It is separated out for easier testing of this logic.
func newerToolchain(need string, list []string) (string, error) {
// Consider each release in the list, from newest to oldest,
// considering only entries >= need and then only entries
// that are the latest in their language family
// (the latest 1.40, the latest 1.39, and so on).
// We prefer the latest patch release before the most recent release family,
// so if the latest release is 1.40.1 we'll take the latest 1.39.X.
// Failing that, we prefer the latest patch release before the most recent
// prerelease family, so if the latest release is 1.40rc1 is out but 1.39 is okay,
// we'll still take 1.39.X.
// Failing that we'll take the latest release.
latest := ""
for i := len(list) - 1; i >= 0; i-- {
v := list[i]
if gover.Compare(v, need) < 0 {
break
}
if gover.Lang(latest) == gover.Lang(v) {
continue
}
newer := latest
latest = v
if newer != "" && !gover.IsPrerelease(newer) {
// latest is the last patch release of Go 1.X, and we saw a non-prerelease of Go 1.(X+1),
// so latest is the one we want.
break
}
}
if latest == "" {
return "", fmt.Errorf("no releases found for go >= %v", need)
}
return "go" + latest, nil
}
// HasAuto reports whether the GOTOOLCHAIN setting allows "auto" upgrades.
func HasAuto() bool {
env := cfg.Getenv("GOTOOLCHAIN")
return env == "auto" || strings.HasSuffix(env, "+auto")
}
// HasPath reports whether the GOTOOLCHAIN setting allows "path" upgrades.
func HasPath() bool {
env := cfg.Getenv("GOTOOLCHAIN")
return env == "path" || strings.HasSuffix(env, "+path")
}
// TestVersionSwitch is set in the test go binary to the value in $TESTGO_VERSION_SWITCH.
// Valid settings are:
//

124
src/cmd/go/internal/toolchain/switch.go
View File

@ -8,9 +8,14 @@ import (
"context"
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"cmd/go/internal/base"
"cmd/go/internal/cfg"
"cmd/go/internal/gover"
"cmd/go/internal/modfetch"
)
// A Switcher collects errors to be reported and then decides
@ -105,3 +110,122 @@ func SwitchOrFatal(ctx context.Context, err error) {
s.Switch(ctx)
base.Exit()
}
// NewerToolchain returns the name of the toolchain to use when we need
// to switch to a newer toolchain that must support at least the given Go version.
// See https://go.dev/doc/toolchain#switch.
//
// If the latest major release is 1.N.0, we use the latest patch release of 1.(N-1) if that's >= version.
// Otherwise we use the latest 1.N if that's allowed.
// Otherwise we use the latest release.
func NewerToolchain(ctx context.Context, version string) (string, error) {
fetch := autoToolchains
if !HasAuto() {
fetch = pathToolchains
}
list, err := fetch(ctx)
if err != nil {
return "", err
}
return newerToolchain(version, list)
}
// autoToolchains returns the list of toolchain versions available to GOTOOLCHAIN=auto or =min+auto mode.
func autoToolchains(ctx context.Context) ([]string, error) {
var versions *modfetch.Versions
err := modfetch.TryProxies(func(proxy string) error {
v, err := modfetch.Lookup(ctx, proxy, "go").Versions(ctx, "")
if err != nil {
return err
}
versions = v
return nil
})
if err != nil {
return nil, err
}
return versions.List, nil
}
// pathToolchains returns the list of toolchain versions available to GOTOOLCHAIN=path or =min+path mode.
func pathToolchains(ctx context.Context) ([]string, error) {
have := make(map[string]bool)
var list []string
for _, dir := range pathDirs() {
if dir == "" || !filepath.IsAbs(dir) {
// Refuse to use local directories in $PATH (hard-coding exec.ErrDot).
continue
}
entries, err := os.ReadDir(dir)
if err != nil {
continue
}
for _, de := range entries {
if de.IsDir() || !strings.HasPrefix(de.Name(), "go1.") {
continue
}
info, err := de.Info()
if err != nil {
continue
}
v, ok := pathVersion(dir, de, info)
if !ok || !strings.HasPrefix(v, "1.") || have[v] {
continue
}
have[v] = true
list = append(list, v)
}
}
sort.Slice(list, func(i, j int) bool {
return gover.Compare(list[i], list[j]) < 0
})
return list, nil
}
// newerToolchain implements NewerToolchain where the list of choices is known.
// It is separated out for easier testing of this logic.
func newerToolchain(need string, list []string) (string, error) {
// Consider each release in the list, from newest to oldest,
// considering only entries >= need and then only entries
// that are the latest in their language family
// (the latest 1.40, the latest 1.39, and so on).
// We prefer the latest patch release before the most recent release family,
// so if the latest release is 1.40.1 we'll take the latest 1.39.X.
// Failing that, we prefer the latest patch release before the most recent
// prerelease family, so if the latest release is 1.40rc1 is out but 1.39 is okay,
// we'll still take 1.39.X.
// Failing that we'll take the latest release.
latest := ""
for i := len(list) - 1; i >= 0; i-- {
v := list[i]
if gover.Compare(v, need) < 0 {
break
}
if gover.Lang(latest) == gover.Lang(v) {
continue
}
newer := latest
latest = v
if newer != "" && !gover.IsPrerelease(newer) {
// latest is the last patch release of Go 1.X, and we saw a non-prerelease of Go 1.(X+1),
// so latest is the one we want.
break
}
}
if latest == "" {
return "", fmt.Errorf("no releases found for go >= %v", need)
}
return "go" + latest, nil
}
// HasAuto reports whether the GOTOOLCHAIN setting allows "auto" upgrades.
func HasAuto() bool {
env := cfg.Getenv("GOTOOLCHAIN")
return env == "auto" || strings.HasSuffix(env, "+auto")
}
// HasPath reports whether the GOTOOLCHAIN setting allows "path" upgrades.
func HasPath() bool {
env := cfg.Getenv("GOTOOLCHAIN")
return env == "path" || strings.HasSuffix(env, "+path")
}