The 'GOARCH'/'GOHOSTARCH' changed from 'amd64' to '386' in golang:1.21-alpine3.18

[GaoJianAllen]

I am very happy to see go1.21 released yesterday!
I can't wait to upgrade my base image which is golang:1.21-alpine3.18.
However, something wrong, my CICD broken.

I checked my code and found the GOARCH changed from 'amd64' to '386'.
I read golang release notes and I can't find the reason for the change.

➜ ~ docker run -it golang:1.21-alpine3.18
/go # go env GOHOSTARCH
386
/go # go env GOARCH
386
/go #

[GaoJianAllen]

go1.20 works well:

golang/1.20/alpine3.18/Dockerfile

Line 21 in b637fdd

export GOAMD64='v1' GOARCH='amd64' GOOS='linux'; \

But go1.21 changed:

golang/1.21/alpine3.18/Dockerfile

Line 21 in b637fdd

url='https://dl.google.com/go/go1.21.0.linux-amd64.tar.gz'; \

[racingmars]

This is also the case for the golang:1.21.0, golang:1.21.0-bullseye, and goland:1.21.0-bookworm (e.g. all the Debian-based) images.

This broke our product build when we upgraded to using the 1.21.0 image to build; it produces an i386 binary instead of an x86_64 binary. We can work around it by setting GOARCH=x86_64 variable in our build to cross-compile, but I wonder if this change was accidental.

[yosifkit]

This is because Docker helpfully pulled the first architecture available that your system could run, the i386 image, because the amd64 image was not available yet. So, this is a duplicate of #480 and #482.

The change in the Dockerfile is irrelevant; Go upstream now provides compiled binaries that work on Alpine, so we don't have to compile it (#474).

The images are available now:

$ docker pull --platform=linux/amd64 golang:1.21-alpine
1.21-alpine: Pulling from library/golang
7264a8db6415: Pull complete
c4d48a809fc2: Pull complete
4f1c88b9dad5: Pull complete
ad3a456e5733: Pull complete
Digest: sha256:445f34008a77b0b98bf1821bf7ef5e37bb63cc42d22ee7c21cc17041070d134f
Status: Downloaded newer image for golang:1.21-alpine
docker.io/library/golang:1.21-alpine
$ docker run -it --rm golang:1.21-alpine
/go # env
HOSTNAME=daef19d37a59
SHLVL=1
HOME=/root
TERM=xterm
PATH=/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
GOPATH=/go
PWD=/go
GOLANG_VERSION=1.21.0
/go # go env
GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/root/.cache/go-build'
GOENV='/root/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.0'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='0'
GOMOD='/dev/null'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3518816536=/tmp/go-build -gno-record-gcc-switches'