kubernetes: Kubernetes 1.28 builds fail on Fedora 38, 39, and 40 (rawhide)

What happened?

K8S v1.28 rpm builds fail on Fedora 38, 39, and rawhide. These are builds using the establish rpm spec file to create the kubernetes rpms in Fedora. The spec file calls kube::golang::setup_env which is where the error occurs. The error occurs in the new ./hack/tools/ncpu tool.

It is important to note that the spec file sets export FORCE_HOST_GO=y. Fedora 40/39 current provide golang 1.21.0; Fedora 38 provides golang 1.20.7.

With Fedora 39 and rawhide the following is observed in the build output:

++ go env GOROOT
+ GOROOT=/usr/lib/golang
+ export GOROOT
+ unset GOBIN
+ export GO15VENDOREXPERIMENT=1
+ GO15VENDOREXPERIMENT=1
+ command -v ncpu
+ pushd /builddir/build/BUILD/kubernetes-855e7c48de7388eb330da0f8d9d2394ee818fb8d/src/k8s.io/kubernetes/hack/tools
+ GO111MODULE=on
+ go install ./ncpu
go: downloading go.uber.org/automaxprocs v1.5.2
ncpu/main.go:23:2: GOPROXY list is not the empty string, but contains no entries
++ kube::log::errexit
++ local err=1
++ set +o
++ grep -qe '-o errexit'
++ set +o xtrace
!!! [0815 13:36:21] Call tree:
!!! [0815 13:36:21]  1: /var/tmp/rpm-tmp.rP6APk:57 kube::golang::setup_env(...)
error: Bad exit status from /var/tmp/rpm-tmp.rP6APk (%build)

With Fedora 38 the following is observed:

++ go env GOROOT
+ GOROOT=/usr/lib/golang
+ export GOROOT
+ unset GOBIN
+ export GO15VENDOREXPERIMENT=1
+ GO15VENDOREXPERIMENT=1
+ command -v ncpu
+ pushd /builddir/build/BUILD/kubernetes-855e7c48de7388eb330da0f8d9d2394ee818fb8d/src/k8s.io/kubernetes/hack/tools
+ GO111MODULE=on
+ go install ./ncpu
go: downloading go.uber.org/automaxprocs v1.5.2
ncpu/main.go:23:2: unrecognized import path "go.uber.org/automaxprocs": https fetch: Get "https://go.uber.org/automaxprocs?go-get=1": dial tcp: lookup go.uber.org: Temporary failure in name resolution
++ kube::log::errexit
++ local err=1
++ set +o
++ grep -qe '-o errexit'
++ set +o xtrace
!!! [0815 14:58:17] Call tree:
!!! [0815 14:58:17]  1: /var/tmp/rpm-tmp.wkPWUg:54 kube::golang::setup_env(...)
error: Bad exit status from /var/tmp/rpm-tmp.wkPWUg (%build)

What did you expect to happen?

Something similar to the successful build of K8S 1.27.4 at the same stage in the build process:

++ go env GOROOT
+ GOROOT=/usr/lib/golang
+ export GOROOT
+ unset GOBIN
+ export GO15VENDOREXPERIMENT=1
+ GO15VENDOREXPERIMENT=1
+ export KUBE_GIT_TREE_STATE=clean

How can we reproduce it (as minimally and precisely as possible)?

1. Install Fedora 38 (current release)
2. sudo dnf install fedora-packager fedora-review
3. Checkout the fedora rpm repo for kubernetes and update spec file for v1.28
4. Build.

Anything else we need to know?

No response

Kubernetes version

Problem building Kubernetes 1.28

Cloud provider

N/A

OS version

Fedora uses a chrooted build environment so these data may not be accurate for building F39 and 40.

$ cat /etc/os-release

NAME="Fedora Linux"
VERSION="38 (Workstation Edition)"
ID=fedora
VERSION_ID=38
VERSION_CODENAME=""
PLATFORM_ID="platform:f38"
PRETTY_NAME="Fedora Linux 38 (Workstation Edition)"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:38"
DEFAULT_HOSTNAME="fedora"
HOME_URL="https://fedoraproject.org/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f38/system-administrators-guide/"
SUPPORT_URL="https://ask.fedoraproject.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=38
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=38
SUPPORT_END=2024-05-14
VARIANT="Workstation Edition"
VARIANT_ID=workstation

$ uname -a
Linux pico 6.4.10-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Aug 11 12:20:29 UTC 2023 x86_64 GNU/Linux

Install tools

Container runtime (CRI) and version (if applicable)

Related plugins (CNI, CSI, …) and versions (if applicable)

Please let me know what I can do to help resolve!

Many thanks