glibc version not found

[daveneeley]

I've tried to download the switcher binary directly instead of using a package manager. It returned an error about a missing glibc version. Are there any steps that I've missed? I (perhaps naively) thought that Go apps didn't ever have external dependencies.

OS=linux
VERSION=0.8.0
curl -L -o switcher https://github.com/danielfoehrKn/kubeswitch/releases/download/${VERSION}/switcher_${OS}_amd64
chmod +x switcher
./switcher

produces this output

./switcher: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by ./switcher)
./switcher: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by ./switcher)

linux machine

uname -a
Linux myhostname 5.15.0-1042-azure #49~20.04.1-Ubuntu SMP Wed Jul 12 12:44:56 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

[hhue13]

I'm facing the same issue on my RHEL v8.9 machine.

uname -a
Linux xxx 4.18.0-513.9.1.el8_9.x86_64 #1 SMP Thu Nov 16 10:29:04 EST 2023 x86_64 x86_64 x86_64 GNU/Linux

The glibc version provided with RHEL v8.9 seems to be 2.28:

ldd --version ldd
ldd (GNU libc) 2.28
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.

Any chance to get switcher running on RHEL v8.9?

[danielfoehrKn]

Hi, thanks for reporting. I'll try to get it running on my Fedora box and report back (so far I have only tested on my OSX machine)

[ravaga]

Same issue for Ubuntu 20.04.6 LTS in Windows WSL

[cdenneen]

#102 This was my issue and had to downgrade. Is it possible for the Homebrew formula to be updated to compile similar to the kubernetes-cli one? This would hopefully avoid the binaries being built with different libc?

[danielfoehrKn]

Do you have a link to the kubernetes-cli homebrew formula where I could see how they do it? Thanks!

[cdenneen]

I was able to get this to work.
I would have used your Makefile but it builds all the arch which isn't necessary when doing this way.

class Switcher < Formula
  desc "Providing the binary executable for the 'switch' script."
  homepage "https://github.com/danielfoehrKn/kubeswitch"
  url "https://github.com/danielfoehrKn/kubeswitch.git",
    tag: "0.9.1",
    revision: "9f82b5f75bbc51615d97d006df86f1b9939123fd"
  license "Apache-2.0"
  head "https://github.com/danielfoehrKn/kubeswitch.git", branch: "master"

  depends_on "bash" => :build
  depends_on "coreutils" => :build
  depends_on "go" => :build

  def install
    rm_rf ".brew_home"
    ldflags = %W[
      -w
      -X github.com/danielfoehrkn/kubeswitch/cmd/switcher.version=#{version}
      -X github.com/danielfoehrkn/kubeswitch/cmd/switcher.buildDate=#{time.iso8601}
    ]

    ENV.prepend_path "PATH", Formula["coreutils"].opt_libexec/"gnubin" # needs GNU date
    system "go", "build", *std_go_args(ldflags:), "./cmd/main.go"

    generate_completions_from_executable(bin/"switcher", "completion", base_name: "switcher")
  end

  def caveats
    <<~EOS
      To setup shell integration, add this to your shell configuration:
      # bash
      source <(switcher init bash)
      # zsh
      source <(switcher init zsh)
      # fish
      switcher init fish | source
    EOS
  end

  test do
    system "#{bin}/switcher", "-h"
  end
end

After that I didn't end up putting anything in bashrc since the completions were done.

switcher works... now if you want to use s or switch then you could do alias s=switcher or alias switch=switcher...

Hope this helps?

[cdenneen]

> more /etc/os-release
NAME="Amazon Linux"
VERSION="2"
ID="amzn"
ID_LIKE="centos rhel fedora"
VERSION_ID="2"
PRETTY_NAME="Amazon Linux 2"
ANSI_COLOR="0;33"
CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2"
HOME_URL="https://amazonlinux.com/"
SUPPORT_END="2025-06-30"

> switcher -v
switcher version 0.9.1

[cdenneen]

Do you have a link to the kubernetes-cli homebrew formula where I could see how they do it? Thanks!

https://github.com/Homebrew/homebrew-core/blob/master/Formula/k/kubernetes-cli.rb

[cdenneen]

After that I didn't end up putting anything in bashrc since the completions were done.

switcher works... now if you want to use s or switch then you could do alias s=switcher or alias switch=switcher...

Totally had forgotten you have 2 Homebrew formulas so I'm curious if the other switch one is necessary or not?
Also the completions should work for zsh as well with the above formula... I had your normal one working on my Mac but in Linux I ended up having to lock to 0.7.2 until I did this so not sure if I really need the switch (switch.sh) one at all or not since it seems its working without anything in my bashrc since it goes into homebrews completions directory

[danielfoehrKn]

Thanks! I will have to try this out before putting it in the formula.
The second homebrew formula is to configure switch.sh if you don't want to manually source switcher init zsh - though that's the recommended way.
I think at this point we can also just get rid of the second formula.

[cdenneen]

@danielfoehrKn I had to make one change for this to work when using a specific version of the formula like when extracting.

https://github.com/cdenneen/homebrew-taps/blob/main/Formula/switcher.rb

So that would work for latest and when you extract out a specific version like:
https://github.com/cdenneen/homebrew-taps/blob/main/Formula/switcher%400.9.1.rb

It's still works.

[vinibali]

same for me on Ubuntu 20.04 LTS

./switcher_linux_amd64: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by ./switcher_linux_amd64)
./switcher_linux_amd64: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by ./switcher_linux_amd64)

i had to rollback to version 0.7.2:
https://github.com/danielfoehrKn/kubeswitch/releases/tag/0.7.2

[mveroone]

Given GlibC is backward compatible, only Debian 12 and later will work with kubeswitch versions >= 0.7.2