| // Copyright 2017 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 buildgo provides tools for pushing and building the Go |
| // distribution on buildlets. |
| package buildgo |
| |
| import ( |
| "archive/tar" |
| "bytes" |
| "compress/gzip" |
| "context" |
| "fmt" |
| "io" |
| "log" |
| "net/http" |
| "path" |
| "time" |
| |
| "golang.org/x/build/buildenv" |
| "golang.org/x/build/buildlet" |
| "golang.org/x/build/dashboard" |
| "golang.org/x/build/internal/spanlog" |
| ) |
| |
| // BuilderRev is a build configuration type and a revision. |
| type BuilderRev struct { |
| Name string // e.g. "linux-amd64-race" |
| Rev string // lowercase hex core repo git hash |
| |
| // optional sub-repository details (both must be present) |
| SubName string // e.g. "net" |
| SubRev string // lowercase hex sub-repo git hash |
| } |
| |
| func (br BuilderRev) IsSubrepo() bool { |
| return br.SubName != "" |
| } |
| |
| func (br BuilderRev) SubRevOrGoRev() string { |
| if br.SubRev != "" { |
| return br.SubRev |
| } |
| return br.Rev |
| } |
| |
| func (br BuilderRev) RepoOrGo() string { |
| if br.SubName == "" { |
| return "go" |
| } |
| return br.SubName |
| } |
| |
| // SnapshotObjectName is the cloud storage object name of the |
| // built Go tree for this builder and Go rev (not the sub-repo). |
| // The entries inside this tarball do not begin with "go/". |
| func (br *BuilderRev) SnapshotObjectName() string { |
| return fmt.Sprintf("%v/%v/%v.tar.gz", "go", br.Name, br.Rev) |
| } |
| |
| // SnapshotURL is the absolute URL of the snapshot object (see above). |
| func (br *BuilderRev) SnapshotURL(buildEnv *buildenv.Environment) string { |
| return buildEnv.SnapshotURL(br.Name, br.Rev) |
| } |
| |
| var TestHookSnapshotExists func(*BuilderRev) bool |
| |
| // SnapshotExists reports whether the snapshot exists in storage. |
| // It returns potentially false negatives on network errors. |
| // Callers must not depend on this as more than an optimization. |
| func (br *BuilderRev) SnapshotExists(ctx context.Context, buildEnv *buildenv.Environment) bool { |
| if f := TestHookSnapshotExists; f != nil { |
| return f(br) |
| } |
| req, err := http.NewRequest("HEAD", br.SnapshotURL(buildEnv), nil) |
| if err != nil { |
| panic(err) |
| } |
| ctx, cancel := context.WithTimeout(ctx, 10*time.Second) |
| defer cancel() |
| res, err := http.DefaultClient.Do(req.WithContext(ctx)) |
| if err != nil { |
| log.Printf("SnapshotExists check: %v", err) |
| return false |
| } |
| return res.StatusCode == http.StatusOK |
| } |
| |
| // A GoBuilder knows how to build a revision of Go with the given configuration. |
| type GoBuilder struct { |
| spanlog.Logger |
| BuilderRev |
| Conf *dashboard.BuildConfig |
| // Goroot is a Unix-style path relative to the work directory of the |
| // builder (e.g. "go"). |
| Goroot string |
| // GorootBootstrap is an optional absolute Unix-style path to the |
| // bootstrap toolchain, overriding the default. |
| GorootBootstrap string |
| } |
| |
| // RunMake builds the tool chain. |
| // goroot is relative to the workdir with forward slashes. |
| // w is the Writer to send build output to. |
| // remoteErr and err are as described at the top of this file. |
| func (gb GoBuilder) RunMake(ctx context.Context, bc buildlet.Client, w io.Writer) (remoteErr, err error) { |
| // Build the source code. |
| makeSpan := gb.CreateSpan("make", gb.Conf.MakeScript()) |
| env := append(gb.Conf.Env(), "GOBIN=") |
| if gb.GorootBootstrap != "" { |
| env = append(env, "GOROOT_BOOTSTRAP="+gb.GorootBootstrap) |
| } |
| remoteErr, err = bc.Exec(ctx, path.Join(gb.Goroot, gb.Conf.MakeScript()), buildlet.ExecOpts{ |
| Output: w, |
| ExtraEnv: env, |
| Debug: true, |
| Args: gb.Conf.MakeScriptArgs(), |
| }) |
| if err != nil { |
| makeSpan.Done(err) |
| return nil, err |
| } |
| if remoteErr != nil { |
| makeSpan.Done(remoteErr) |
| return fmt.Errorf("make script failed: %v", remoteErr), nil |
| } |
| makeSpan.Done(nil) |
| |
| // Need to run "go install -race std" before the snapshot + tests. |
| if pkgs := gb.Conf.GoInstallRacePackages(); len(pkgs) > 0 { |
| sp := gb.CreateSpan("install_race_std") |
| remoteErr, err = bc.Exec(ctx, path.Join(gb.Goroot, "bin/go"), buildlet.ExecOpts{ |
| Output: w, |
| ExtraEnv: append(gb.Conf.Env(), "GOBIN="), |
| Debug: true, |
| Args: append([]string{"install", "-race"}, pkgs...), |
| }) |
| if err != nil { |
| sp.Done(err) |
| return nil, err |
| } |
| if remoteErr != nil { |
| sp.Done(err) |
| return fmt.Errorf("go install -race std failed: %v", remoteErr), nil |
| } |
| sp.Done(nil) |
| } |
| |
| if gb.Name == "linux-amd64-racecompile" { |
| return gb.runConcurrentGoBuildStdCmd(ctx, bc, w) |
| } |
| |
| return nil, nil |
| } |
| |
| // runConcurrentGoBuildStdCmd is a step specific only to the |
| // "linux-amd64-racecompile" builder to exercise the Go 1.9's new |
| // concurrent compilation. It re-builds the standard library and tools |
| // with -gcflags=-c=8 using a race-enabled cmd/compile and cmd/link |
| // (built by caller, RunMake, per builder config). |
| // The idea is that this might find data races in cmd/compile and cmd/link. |
| func (gb GoBuilder) runConcurrentGoBuildStdCmd(ctx context.Context, bc buildlet.Client, w io.Writer) (remoteErr, err error) { |
| span := gb.CreateSpan("go_build_c128_std_cmd") |
| remoteErr, err = bc.Exec(ctx, path.Join(gb.Goroot, "bin/go"), buildlet.ExecOpts{ |
| Output: w, |
| ExtraEnv: append(gb.Conf.Env(), "GOBIN="), |
| Debug: true, |
| Args: []string{"build", "-a", "-gcflags=-c=8", "std", "cmd"}, |
| }) |
| if err != nil { |
| span.Done(err) |
| return nil, err |
| } |
| if remoteErr != nil { |
| span.Done(remoteErr) |
| return fmt.Errorf("go build failed: %v", remoteErr), nil |
| } |
| span.Done(nil) |
| return nil, nil |
| } |
| |
| // VersionTgz returns an io.Reader of a *.tar.gz file containing only |
| // a VERSION file containing the contents of the provided rev string. |
| func VersionTgz(rev string) io.Reader { |
| var buf bytes.Buffer |
| zw := gzip.NewWriter(&buf) |
| tw := tar.NewWriter(zw) |
| |
| // Writing to a bytes.Buffer should never fail, so check |
| // errors with an explosion: |
| check := func(err error) { |
| if err != nil { |
| panic("previously assumed to never fail: " + err.Error()) |
| } |
| } |
| |
| contents := fmt.Sprintf("devel " + rev) |
| check(tw.WriteHeader(&tar.Header{ |
| Name: "VERSION", |
| Mode: 0644, |
| Size: int64(len(contents)), |
| })) |
| _, err := io.WriteString(tw, contents) |
| check(err) |
| check(tw.Close()) |
| check(zw.Close()) |
| return bytes.NewReader(buf.Bytes()) |
| } |