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From 7cc60b3887be2d5674b9f5d422d022976cf205e5 Mon Sep 17 00:00:00 2001
From: Matt Madison <matt@madison.systems>
Date: Fri, 2 Mar 2018 06:00:20 -0800
Subject: [PATCH] cmd/go: make GOROOT precious by default
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.
Upstream-Status: Inappropriate [OE specific]
Signed-off-by: Matt Madison <matt@madison.systems>
---
src/cmd/go/internal/work/action.go | 3 +++
src/cmd/go/internal/work/build.go | 5 +++++
src/cmd/go/internal/work/exec.go | 25 +++++++++++++++++++++++++
3 files changed, 33 insertions(+)
Index: go/src/cmd/go/internal/work/action.go
===================================================================
--- go.orig/src/cmd/go/internal/work/action.go
+++ go/src/cmd/go/internal/work/action.go
@@ -600,6 +600,9 @@ 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
Index: go/src/cmd/go/internal/work/build.go
===================================================================
--- go.orig/src/cmd/go/internal/work/build.go
+++ go/src/cmd/go/internal/work/build.go
@@ -147,6 +147,7 @@ See also: go install, go get, go clean.
}
const concurrentGCBackendCompilationEnabledByDefault = true
+var goRootPrecious bool = true
func init() {
// break init cycle
@@ -160,6 +161,10 @@ func init() {
AddBuildFlags(CmdBuild)
AddBuildFlags(CmdInstall)
+
+ if x := os.Getenv("GOROOT_OVERRIDE"); x != "" {
+ goRootPrecious = false
+ }
}
// Note that flags consulted by other parts of the code
Index: go/src/cmd/go/internal/work/exec.go
===================================================================
--- go.orig/src/cmd/go/internal/work/exec.go
+++ go/src/cmd/go/internal/work/exec.go
@@ -436,6 +436,23 @@ func (b *Builder) build(a *Action) (err
return fmt.Errorf("missing or invalid binary-only package; expected file %q", a.Package.Target)
}
+ 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
}
@@ -1438,6 +1455,14 @@ func BuildInstallFunc(b *Builder, a *Act
return nil
}
+ 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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