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From 9ba507e076c744f4d394418e4a849e68cd426a4a Mon Sep 17 00:00:00 2001
From: Alex Kube <alexander.j.kube@gmail.com>
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 <matt@madison.systems>.
Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
---
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
@@ -670,6 +670,9 @@ 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
@@ -167,6 +167,8 @@ See also: go install, go get, go clean.
const concurrentGCBackendCompilationEnabledByDefault = true
+var goRootPrecious bool = true
+
func init() {
// break init cycle
CmdBuild.Run = runBuild
@@ -179,6 +181,10 @@ 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
@@ -468,6 +468,23 @@ func (b *Builder) build(a *Action) (err
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
}
@@ -1520,6 +1537,14 @@ func BuildInstallFunc(b *Builder, a *Act
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
}
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