diff --git a/src/cmd/go/internal/modget/get.go b/src/cmd/go/internal/modget/get.go index 4ca7f5b529..126b1f4bd4 100644 --- a/src/cmd/go/internal/modget/get.go +++ b/src/cmd/go/internal/modget/get.go @@ -628,6 +628,10 @@ func runGet(ctx context.Context, cmd *base.Command, args []string) { if err != nil { base.Fatalf("go: %v", err) } + + // TODO(bcmills) What should happen here under lazy loading? + // Downgrading may intentionally violate the lazy-loading invariants. + modload.SetBuildList(buildList) modload.ReloadBuildList() // note: does not update go.mod base.ExitIfErrors() diff --git a/src/cmd/go/internal/modload/buildlist.go b/src/cmd/go/internal/modload/buildlist.go new file mode 100644 index 0000000000..2302b044e8 --- /dev/null +++ b/src/cmd/go/internal/modload/buildlist.go @@ -0,0 +1,117 @@ +// 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 modload + +import ( + "cmd/go/internal/base" + "cmd/go/internal/cfg" + "cmd/go/internal/imports" + "cmd/go/internal/mvs" + "context" + "fmt" + "os" + + "golang.org/x/mod/module" +) + +// buildList is the list of modules to use for building packages. +// It is initialized by calling ImportPaths, ImportFromFiles, +// LoadALL, or LoadBuildList, each of which uses loaded.load. +// +// Ideally, exactly ONE of those functions would be called, +// and exactly once. Most of the time, that's true. +// During "go get" it may not be. TODO(rsc): Figure out if +// that restriction can be established, or else document why not. +// +var buildList []module.Version + +// LoadBuildList loads and returns the build list from go.mod. +// The loading of the build list happens automatically in ImportPaths: +// LoadBuildList need only be called if ImportPaths is not +// (typically in commands that care about the module but +// no particular package). +func LoadBuildList(ctx context.Context) []module.Version { + InitMod(ctx) + ReloadBuildList() + WriteGoMod() + return buildList +} + +// ReloadBuildList resets the state of loaded packages, then loads and returns +// the build list set in SetBuildList. +func ReloadBuildList() []module.Version { + loaded = loadFromRoots(loaderParams{ + tags: imports.Tags(), + listRoots: func() []string { return nil }, + allClosesOverTests: index.allPatternClosesOverTests(), // but doesn't matter because the root list is empty. + }) + return buildList +} + +// BuildList returns the module build list, +// typically constructed by a previous call to +// LoadBuildList or ImportPaths. +// The caller must not modify the returned list. +func BuildList() []module.Version { + return buildList +} + +// SetBuildList sets the module build list. +// The caller is responsible for ensuring that the list is valid. +// SetBuildList does not retain a reference to the original list. +func SetBuildList(list []module.Version) { + buildList = append([]module.Version{}, list...) +} + +// TidyBuildList trims the build list to the minimal requirements needed to +// retain the same versions of all packages from the preceding Load* or +// ImportPaths* call. +func TidyBuildList() { + used := map[module.Version]bool{Target: true} + for _, pkg := range loaded.pkgs { + used[pkg.mod] = true + } + + keep := []module.Version{Target} + var direct []string + for _, m := range buildList[1:] { + if used[m] { + keep = append(keep, m) + if loaded.direct[m.Path] { + direct = append(direct, m.Path) + } + } else if cfg.BuildV { + if _, ok := index.require[m]; ok { + fmt.Fprintf(os.Stderr, "unused %s\n", m.Path) + } + } + } + + min, err := mvs.Req(Target, direct, &mvsReqs{buildList: keep}) + if err != nil { + base.Fatalf("go: %v", err) + } + buildList = append([]module.Version{Target}, min...) +} + +// checkMultiplePaths verifies that a given module path is used as itself +// or as a replacement for another module, but not both at the same time. +// +// (See https://golang.org/issue/26607 and https://golang.org/issue/34650.) +func checkMultiplePaths() { + firstPath := make(map[module.Version]string, len(buildList)) + for _, mod := range buildList { + src := mod + if rep := Replacement(mod); rep.Path != "" { + src = rep + } + if prev, ok := firstPath[src]; !ok { + firstPath[src] = mod.Path + } else if prev != mod.Path { + base.Errorf("go: %s@%s used for two different module paths (%s and %s)", src.Path, src.Version, prev, mod.Path) + } + } + base.ExitIfErrors() +} diff --git a/src/cmd/go/internal/modload/load.go b/src/cmd/go/internal/modload/load.go index 9cedc219b6..6050646594 100644 --- a/src/cmd/go/internal/modload/load.go +++ b/src/cmd/go/internal/modload/load.go @@ -118,22 +118,10 @@ import ( "cmd/go/internal/par" "cmd/go/internal/search" "cmd/go/internal/str" - "cmd/go/internal/trace" "golang.org/x/mod/module" ) -// buildList is the list of modules to use for building packages. -// It is initialized by calling ImportPaths, ImportFromFiles, -// LoadALL, or LoadBuildList, each of which uses loaded.load. -// -// Ideally, exactly ONE of those functions would be called, -// and exactly once. Most of the time, that's true. -// During "go get" it may not be. TODO(rsc): Figure out if -// that restriction can be established, or else document why not. -// -var buildList []module.Version - // loaded is the most recently-used package loader. // It holds details about individual packages. var loaded *loader @@ -250,26 +238,6 @@ func ImportPathsQuiet(ctx context.Context, patterns []string, tags map[string]bo return matches } -// checkMultiplePaths verifies that a given module path is used as itself -// or as a replacement for another module, but not both at the same time. -// -// (See https://golang.org/issue/26607 and https://golang.org/issue/34650.) -func checkMultiplePaths() { - firstPath := make(map[module.Version]string, len(buildList)) - for _, mod := range buildList { - src := mod - if rep := Replacement(mod); rep.Path != "" { - src = rep - } - if prev, ok := firstPath[src]; !ok { - firstPath[src] = mod.Path - } else if prev != mod.Path { - base.Errorf("go: %s@%s used for two different module paths (%s and %s)", src.Path, src.Version, prev, mod.Path) - } - } - base.ExitIfErrors() -} - // matchLocalDirs is like m.MatchDirs, but tries to avoid scanning directories // outside of the standard library and active modules. func matchLocalDirs(m *search.Match) { @@ -481,31 +449,6 @@ func DirImportPath(dir string) string { return "." } -// LoadBuildList loads and returns the build list from go.mod. -// The loading of the build list happens automatically in ImportPaths: -// LoadBuildList need only be called if ImportPaths is not -// (typically in commands that care about the module but -// no particular package). -func LoadBuildList(ctx context.Context) []module.Version { - ctx, span := trace.StartSpan(ctx, "LoadBuildList") - defer span.Done() - InitMod(ctx) - ReloadBuildList() - WriteGoMod() - return buildList -} - -// ReloadBuildList resets the state of loaded packages, then loads and returns -// the build list set in SetBuildList. -func ReloadBuildList() []module.Version { - loaded = loadFromRoots(loaderParams{ - tags: imports.Tags(), - listRoots: func() []string { return nil }, - allClosesOverTests: index.allPatternClosesOverTests(), // but doesn't matter because the root list is empty. - }) - return buildList -} - // LoadALL returns the set of all packages in the current module // and their dependencies in any other modules, without filtering // due to build tags, except "+build ignore". @@ -571,52 +514,6 @@ func TargetPackages(ctx context.Context, pattern string) *search.Match { return m } -// BuildList returns the module build list, -// typically constructed by a previous call to -// LoadBuildList or ImportPaths. -// The caller must not modify the returned list. -func BuildList() []module.Version { - return buildList -} - -// SetBuildList sets the module build list. -// The caller is responsible for ensuring that the list is valid. -// SetBuildList does not retain a reference to the original list. -func SetBuildList(list []module.Version) { - buildList = append([]module.Version{}, list...) -} - -// TidyBuildList trims the build list to the minimal requirements needed to -// retain the same versions of all packages from the preceding Load* or -// ImportPaths* call. -func TidyBuildList() { - used := map[module.Version]bool{Target: true} - for _, pkg := range loaded.pkgs { - used[pkg.mod] = true - } - - keep := []module.Version{Target} - var direct []string - for _, m := range buildList[1:] { - if used[m] { - keep = append(keep, m) - if loaded.direct[m.Path] { - direct = append(direct, m.Path) - } - } else if cfg.BuildV { - if _, ok := index.require[m]; ok { - fmt.Fprintf(os.Stderr, "unused %s\n", m.Path) - } - } - } - - min, err := mvs.Req(Target, direct, &mvsReqs{buildList: keep}) - if err != nil { - base.Fatalf("go: %v", err) - } - buildList = append([]module.Version{Target}, min...) -} - // ImportMap returns the actual package import path // for an import path found in source code. // If the given import path does not appear in the source code