x/build: gomote: aix-ppc64 gomote has incorrect GOROOT_BOOTSTRAP

[ianlancetaylor]

I can use

GOMOTEDISABLELUCI=1 gomote create aix-ppc64

to create an AIX gomote. However, running make.bash on that gomote fails:

 GOMOTEDISABLELUCI=1 gomote run iant-aix-ppc64-0 go/src/make.bash
# Streaming results from "iant-aix-ppc64-0" to "/tmp/gomote950845207/iant-aix-ppc64-0.stdout"...
WARNING: /ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/bin/go does not exist, found /opt/freeware/bin/go from env
WARNING: set /opt/freeware/lib/golang as GOROOT_BOOTSTRAP
Building Go cmd/dist using /opt/freeware/lib/golang. (go1.21.9 aix/ppc64)
cmd/dist/buildtool.go:16:2: cannot find package "go/version" in any of:
	/opt/freeware/lib/golang/src/go/version (from $GOROOT)
	/go/src/go/version (from $GOPATH)
found packages main (build.go) and building_Go_requires_Go_1_24_6_or_later (notgo124.go) in /ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/cmd/dist
# Wrote results from "iant-aix-ppc64-0" to "/tmp/gomote950845207/iant-aix-ppc64-0.stdout".
# Error running run: unable to execute go/src/make.bash: rpc error: code = Unknown desc = command execution failed: exit status 1

The problem is that GOROOT_BOOTSTRAP is incorrect, or, alternatively, that the bootstrap toolchain is not installed where it is expected. The default environment variable points to ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/ but the toolchain is installed in ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go.

Setting the variable explicitly works:

GOMOTEDISABLELUCI=1 gomote run -e GOROOT_BOOTSTRAP=/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go iant-aix-ppc64-0 go/src/make.bash

This should be fixed on way or another so that the default works. Thanks.

CC @golang/release

[gabyhelp]

Related Issues

• make.bash: missing GOROOT_BOOTSTRAP on `linux-ppc64le-power10osu` #61847 (closed)
• make.bash: make default GOROOT_BOOTSTRAP more useful #14339 (closed)
• make.bash: issue with 'GOROOT="$GOROOT_BOOTSTRAP" GOOS="" ' #20815 (closed)
• x/build/cmd/gomote: default SSH environment is still not usable on Windows #56015 (closed)
• src: make.bash now requires $GOROOT_BOOTSTRAP to be set to use an existing Go toolchain in your $PATH #50037 (closed)
• internal/gomote: ensure the correct bootstrap toolchain is used #64745 (closed)
• cmd/dist: make.bash gives error when GOROOT_BOOTSTRAP is not set correctly #12167 (closed)
• cmd/go: aix failing to build Go bootstrap using toolchain #31762 (closed)
• cmd/dist: SIGSEGV during bootstrap on aix-ppc64 #58857 (closed)
• x/build/cmd/gomote: push failed for gotip-linux-ppc64-power10 #66619 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[mwriter]

GOMOTEDISABLELUCI

GOROOT_BOOTSTRAP

Is there a complete list of environment variables related to golang and its core packages?
How it's done for experimental flags:
https://pkg.go.dev/internal/goexperiment

[ianlancetaylor]

Environment variables that affect running the tools are documented at https://pkg.go.dev/cmd/go#hdr-Environment_variables.

That does not cover environment variables like GOROOT_BOOTSTRAP, which is only used for building the tools. Environment variables that affect building the tools are documented at https://go.googlesource.com/go/+/refs/heads/master/src/make.bash.

None of that covers environment variables like GOMOTEDISABLELUCI, which is only used for running the gomote command. The gomote command is not part of the Go tools. It is only used by Go maintainers. Environment variables that affect gomote are documented at https://pkg.go.dev/golang.org/x/build/cmd/gomote.

[mwriter]

It is only used by Go maintainers

But are there definitely no other highly specialized environment variables anymore?
I used to think I knew all golang envvars until I saw your issue :)

[ianlancetaylor]

I know where environment variables should be documented but I don't know for sure that they are all in fact documented. We'll have to fix cases as we find them.

[gopherbot]

Change https://go.dev/cl/751820 mentions this issue: dashboard: set the correct GOROOT_BOOTSTRAP on aix-ppc64