From 9ba507e076c744f4d394418e4a849e68cd426a4a Mon Sep 17 00:00:00 2001 From: Alex Kube Date: Wed, 23 Oct 2019 21:18:56 +0430 Subject: [PATCH 7/9] cmd/go: make GOROOT precious by default Upstream-Status: Inappropriate [OE specific] The go build tool normally rebuilds whatever it detects is stale. This can be a problem when GOROOT is intended to be read-only and the go runtime has been built as a shared library, since we don't want every application to be rebuilding the shared runtime - particularly in cross-build/packaging setups, since that would lead to 'abi mismatch' runtime errors. This patch prevents the install and linkshared actions from installing to GOROOT unless overridden with the GOROOT_OVERRIDE environment variable. Adapted to Go 1.13 from patches originally submitted to the meta/recipes-devtools/go tree by Matt Madison . Signed-off-by: Alexander J Kube --- src/cmd/go/internal/work/action.go | 3 +++ src/cmd/go/internal/work/build.go | 6 ++++++ src/cmd/go/internal/work/exec.go | 25 +++++++++++++++++++++++++ 3 files changed, 34 insertions(+) --- a/src/cmd/go/internal/work/action.go +++ b/src/cmd/go/internal/work/action.go @@ -673,6 +673,9 @@ func (b *Builder) addTransitiveLinkDeps( if p1 == nil || p1.Shlib == "" || haveShlib[filepath.Base(p1.Shlib)] { continue } + if goRootPrecious && (p1.Standard || p1.Goroot) { + continue + } haveShlib[filepath.Base(p1.Shlib)] = true // TODO(rsc): The use of ModeInstall here is suspect, but if we only do ModeBuild, // we'll end up building an overall library or executable that depends at runtime --- a/src/cmd/go/internal/work/build.go +++ b/src/cmd/go/internal/work/build.go @@ -197,6 +197,8 @@ See also: go install, go get, go clean. const concurrentGCBackendCompilationEnabledByDefault = true +var goRootPrecious bool = true + func init() { // break init cycle CmdBuild.Run = runBuild @@ -209,6 +211,10 @@ func init() { AddBuildFlags(CmdBuild, DefaultBuildFlags) AddBuildFlags(CmdInstall, DefaultBuildFlags) + + if x := os.Getenv("GOROOT_OVERRIDE"); x != "" { + goRootPrecious = false + } } // Note that flags consulted by other parts of the code --- a/src/cmd/go/internal/work/exec.go +++ b/src/cmd/go/internal/work/exec.go @@ -535,6 +535,23 @@ func (b *Builder) build(ctx context.Cont return errors.New("binary-only packages are no longer supported") } + if goRootPrecious && (a.Package.Standard || a.Package.Goroot) { + _, err := os.Stat(a.Package.Target) + if err == nil { + a.built = a.Package.Target + a.Target = a.Package.Target + a.buildID = b.fileHash(a.Package.Target) + a.Package.Stale = false + a.Package.StaleReason = "GOROOT-resident package" + return nil + } + a.Package.Stale = true + a.Package.StaleReason = "missing or invalid GOROOT-resident package" + if b.IsCmdList { + return nil + } + } + if err := b.Mkdir(a.Objdir); err != nil { return err } @@ -1585,6 +1602,14 @@ func (b *Builder) linkShared(ctx context return err } + if goRootPrecious && a.Package != nil { + p := a.Package + if p.Standard || p.Goroot { + err := fmt.Errorf("attempting to install package %s into read-only GOROOT", p.ImportPath) + return err + } + } + if err := b.Mkdir(a.Objdir); err != nil { return err }