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cmd/go: prep for 'go env' refactoring
This CL refactors code a little to make it easier to add GOEXPERIMENT support in the future. Change-Id: I87903056f7863049e58be72047b2b8a60a213baf Reviewed-on: https://go-review.googlesource.com/c/go/+/329654 Run-TryBot: Matthew Dempsky <mdempsky@google.com> Trust: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Bryan C. Mills <bcmills@google.com>
This commit is contained in:
Matthew Dempsky
parent
901510ed4e
commit
a1d27269d6
@ -10,6 +10,7 @@ import (
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"encoding/json"
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"fmt"
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"go/build"
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"internal/buildcfg"
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"io"
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"os"
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"path/filepath"
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@ -197,6 +198,21 @@ func runEnv(ctx context.Context, cmd *base.Command, args []string) {
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if *envU && *envW {
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base.Fatalf("go env: cannot use -u with -w")
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}
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// Handle 'go env -w' and 'go env -u' before calling buildcfg.Check,
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// so they can be used to recover from an invalid configuration.
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if *envW {
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runEnvW(args)
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return
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}
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if *envU {
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runEnvU(args)
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return
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}
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buildcfg.Check()
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env := cfg.CmdEnv
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env = append(env, ExtraEnvVars()...)
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@ -206,14 +222,7 @@ func runEnv(ctx context.Context, cmd *base.Command, args []string) {
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// Do we need to call ExtraEnvVarsCostly, which is a bit expensive?
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needCostly := false
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if *envU || *envW {
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// We're overwriting or removing default settings,
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// so it doesn't really matter what the existing settings are.
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//
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// Moreover, we haven't validated the new settings yet, so it is
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// important that we NOT perform any actions based on them,
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// such as initializing the builder to compute other variables.
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} else if len(args) == 0 {
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if len(args) == 0 {
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// We're listing all environment variables ("go env"),
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// including the expensive ones.
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needCostly = true
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@ -238,95 +247,6 @@ func runEnv(ctx context.Context, cmd *base.Command, args []string) {
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env = append(env, ExtraEnvVarsCostly()...)
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}
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if *envW {
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// Process and sanity-check command line.
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if len(args) == 0 {
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base.Fatalf("go env -w: no KEY=VALUE arguments given")
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}
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osEnv := make(map[string]string)
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for _, e := range cfg.OrigEnv {
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if i := strings.Index(e, "="); i >= 0 {
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osEnv[e[:i]] = e[i+1:]
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}
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}
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add := make(map[string]string)
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for _, arg := range args {
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i := strings.Index(arg, "=")
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if i < 0 {
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base.Fatalf("go env -w: arguments must be KEY=VALUE: invalid argument: %s", arg)
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}
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key, val := arg[:i], arg[i+1:]
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if err := checkEnvWrite(key, val); err != nil {
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base.Fatalf("go env -w: %v", err)
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}
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if _, ok := add[key]; ok {
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base.Fatalf("go env -w: multiple values for key: %s", key)
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}
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add[key] = val
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if osVal := osEnv[key]; osVal != "" && osVal != val {
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fmt.Fprintf(os.Stderr, "warning: go env -w %s=... does not override conflicting OS environment variable\n", key)
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}
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}
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goos, okGOOS := add["GOOS"]
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goarch, okGOARCH := add["GOARCH"]
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if okGOOS || okGOARCH {
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if !okGOOS {
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goos = cfg.Goos
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}
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if !okGOARCH {
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goarch = cfg.Goarch
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}
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if err := work.CheckGOOSARCHPair(goos, goarch); err != nil {
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base.Fatalf("go env -w: %v", err)
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}
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}
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gotmp, okGOTMP := add["GOTMPDIR"]
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if okGOTMP {
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if !filepath.IsAbs(gotmp) && gotmp != "" {
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base.Fatalf("go env -w: GOTMPDIR must be an absolute path")
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}
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}
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updateEnvFile(add, nil)
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return
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}
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if *envU {
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// Process and sanity-check command line.
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if len(args) == 0 {
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base.Fatalf("go env -u: no arguments given")
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}
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del := make(map[string]bool)
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for _, arg := range args {
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if err := checkEnvWrite(arg, ""); err != nil {
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base.Fatalf("go env -u: %v", err)
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}
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del[arg] = true
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}
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if del["GOOS"] || del["GOARCH"] {
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goos, goarch := cfg.Goos, cfg.Goarch
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if del["GOOS"] {
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goos = getOrigEnv("GOOS")
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if goos == "" {
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goos = build.Default.GOOS
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}
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}
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if del["GOARCH"] {
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goarch = getOrigEnv("GOARCH")
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if goarch == "" {
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goarch = build.Default.GOARCH
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}
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}
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if err := work.CheckGOOSARCHPair(goos, goarch); err != nil {
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base.Fatalf("go env -u: %v", err)
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}
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}
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updateEnvFile(nil, del)
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return
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}
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if len(args) > 0 {
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if *envJson {
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var es []cfg.EnvVar
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@ -351,6 +271,102 @@ func runEnv(ctx context.Context, cmd *base.Command, args []string) {
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PrintEnv(os.Stdout, env)
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}
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func runEnvW(args []string) {
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// Process and sanity-check command line.
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if len(args) == 0 {
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base.Fatalf("go env -w: no KEY=VALUE arguments given")
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}
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osEnv := make(map[string]string)
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for _, e := range cfg.OrigEnv {
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if i := strings.Index(e, "="); i >= 0 {
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osEnv[e[:i]] = e[i+1:]
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}
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}
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add := make(map[string]string)
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for _, arg := range args {
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i := strings.Index(arg, "=")
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if i < 0 {
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base.Fatalf("go env -w: arguments must be KEY=VALUE: invalid argument: %s", arg)
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}
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key, val := arg[:i], arg[i+1:]
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if err := checkEnvWrite(key, val); err != nil {
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base.Fatalf("go env -w: %v", err)
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}
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if _, ok := add[key]; ok {
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base.Fatalf("go env -w: multiple values for key: %s", key)
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}
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add[key] = val
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if osVal := osEnv[key]; osVal != "" && osVal != val {
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fmt.Fprintf(os.Stderr, "warning: go env -w %s=... does not override conflicting OS environment variable\n", key)
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}
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}
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if err := checkBuildConfig(add, nil); err != nil {
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base.Fatalf("go env -w: %v", err)
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}
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gotmp, okGOTMP := add["GOTMPDIR"]
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if okGOTMP {
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if !filepath.IsAbs(gotmp) && gotmp != "" {
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base.Fatalf("go env -w: GOTMPDIR must be an absolute path")
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}
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}
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updateEnvFile(add, nil)
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}
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func runEnvU(args []string) {
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// Process and sanity-check command line.
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if len(args) == 0 {
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base.Fatalf("go env -u: no arguments given")
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}
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del := make(map[string]bool)
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for _, arg := range args {
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if err := checkEnvWrite(arg, ""); err != nil {
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base.Fatalf("go env -u: %v", err)
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}
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del[arg] = true
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}
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if err := checkBuildConfig(nil, del); err != nil {
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base.Fatalf("go env -u: %v", err)
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}
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updateEnvFile(nil, del)
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}
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// checkBuildConfig checks whether the build configuration is valid
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// after the specified configuration environment changes are applied.
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func checkBuildConfig(add map[string]string, del map[string]bool) error {
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// get returns the value for key after applying add and del and
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// reports whether it changed. cur should be the current value
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// (i.e., before applying changes) and def should be the default
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// value (i.e., when no environment variables are provided at all).
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get := func(key, cur, def string) (string, bool) {
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if val, ok := add[key]; ok {
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return val, true
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}
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if del[key] {
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val := getOrigEnv(key)
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if val == "" {
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val = def
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}
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return val, true
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}
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return cur, false
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}
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goos, okGOOS := get("GOOS", cfg.Goos, build.Default.GOOS)
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goarch, okGOARCH := get("GOARCH", cfg.Goarch, build.Default.GOARCH)
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if okGOOS || okGOARCH {
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if err := work.CheckGOOSARCHPair(goos, goarch); err != nil {
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return err
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}
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}
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return nil
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}
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// PrintEnv prints the environment variables to w.
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func PrintEnv(w io.Writer, env []cfg.EnvVar) {
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for _, e := range env {
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@ -145,24 +145,6 @@ func main() {
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os.Exit(2)
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}
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if err := buildcfg.Error; err != nil {
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fmt.Fprintf(os.Stderr, "go: %v\n", buildcfg.Error)
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os.Exit(2)
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}
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// Set environment (GOOS, GOARCH, etc) explicitly.
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// In theory all the commands we invoke should have
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// the same default computation of these as we do,
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// but in practice there might be skew
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// This makes sure we all agree.
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cfg.OrigEnv = os.Environ()
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cfg.CmdEnv = envcmd.MkEnv()
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for _, env := range cfg.CmdEnv {
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if os.Getenv(env.Name) != env.Value {
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os.Setenv(env.Name, env.Value)
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}
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}
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BigCmdLoop:
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for bigCmd := base.Go; ; {
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for _, cmd := range bigCmd.Commands {
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@ -188,18 +170,7 @@ BigCmdLoop:
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if !cmd.Runnable() {
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continue
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}
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cmd.Flag.Usage = func() { cmd.Usage() }
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if cmd.CustomFlags {
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args = args[1:]
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} else {
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base.SetFromGOFLAGS(&cmd.Flag)
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cmd.Flag.Parse(args[1:])
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args = cmd.Flag.Args()
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}
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ctx := maybeStartTrace(context.Background())
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ctx, span := trace.StartSpan(ctx, fmt.Sprint("Running ", cmd.Name(), " command"))
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cmd.Run(ctx, cmd, args)
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span.Done()
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invoke(cmd, args)
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base.Exit()
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return
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}
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@ -213,6 +184,39 @@ BigCmdLoop:
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}
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}
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func invoke(cmd *base.Command, args []string) {
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// 'go env' handles checking the build config
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if cmd != envcmd.CmdEnv {
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buildcfg.Check()
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}
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// Set environment (GOOS, GOARCH, etc) explicitly.
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// In theory all the commands we invoke should have
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// the same default computation of these as we do,
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// but in practice there might be skew
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// This makes sure we all agree.
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cfg.OrigEnv = os.Environ()
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cfg.CmdEnv = envcmd.MkEnv()
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for _, env := range cfg.CmdEnv {
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if os.Getenv(env.Name) != env.Value {
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os.Setenv(env.Name, env.Value)
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}
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}
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cmd.Flag.Usage = func() { cmd.Usage() }
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if cmd.CustomFlags {
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args = args[1:]
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} else {
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base.SetFromGOFLAGS(&cmd.Flag)
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cmd.Flag.Parse(args[1:])
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args = cmd.Flag.Args()
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}
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ctx := maybeStartTrace(context.Background())
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ctx, span := trace.StartSpan(ctx, fmt.Sprint("Running ", cmd.Name(), " command"))
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cmd.Run(ctx, cmd, args)
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span.Done()
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}
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func init() {
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base.Usage = mainUsage
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}
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23
src/cmd/go/testdata/script/env_unset.txt
vendored
Normal file
23
src/cmd/go/testdata/script/env_unset.txt
vendored
Normal file
@ -0,0 +1,23 @@
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# Test that we can unset variables, even if initially invalid,
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# as long as resulting config is valid.
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env GOENV=badenv
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env GOOS=
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env GOARCH=
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! go env
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stderr '^cmd/go: unsupported GOOS/GOARCH pair bados/badarch$'
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! go env -u GOOS
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stderr '^go env -u: unsupported GOOS/GOARCH pair \w+/badarch$'
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! go env -u GOARCH
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stderr '^go env -u: unsupported GOOS/GOARCH pair bados/\w+$'
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go env -u GOOS GOARCH
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go env
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-- badenv --
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GOOS=bados
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GOARCH=badarch
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