Shell zsh check os with ostype and uname

[NapoleonWils0n]

i have 3 jails that use nullfs to mount the home directory

each jail has zsh installed and so they all use the zsh config files

i need a way to check the os,
so i can have different shell config for each jail

so they can have different shell paths
XDG_RUNTIME_DIR directories, or use X11 or wayland

this is done using the ~/.zshenv file
with 2 case statements

the first case statement uses OSTYPE to check if the jail is running Freebsd
the second case statement use uname -a to check if the jail is running Ubuntu or Rocky linux

cerberus/zsh/ostype-uname.org at master · NapoleonWils0n/cerberus

cerberus code library. Contribute to NapoleonWils0n/cerberus development by creating an account on GitHub.

github.com

vi ~/.zshenv

# ~/.zshenv

# for ZSH
case "$OSTYPE" in
  freebsd*)
  # Path
  typeset -U PATH path
  path=("$path[@]")
  export PATH

  # XDG_RUNTIME_DIR
  export XDG_RUNTIME_DIR=/var/run/xdg/"${USER}"

  # wayland - uncomment to use wayland
  export WAYLAND_DISPLAY=wayland-0
  export QT_QPA_PLATFORM=wayland
  export GDK_BACKEND=wayland
  ;;
esac

case "$(uname -a)" in
  *ubuntu*)
  typeset -U PATH path
  path=( "$HOME/.cargo/bin" "/opt/resolve/bin" "/bin" "/usr/bin" "$path[@]")
  export PATH

  # XDG_RUNTIME_DIR
  export XDG_RUNTIME_DIR="/run/user/`id -u`"

  # dummy-uvm.so for access to the gpu
  export LD_PRELOAD="${HOME}"/.config/gpu/dummy-uvm.so

  # wayland - uncomment to use wayland
  #export WAYLAND_DISPLAY=wayland-0
  #export QT_QPA_PLATFORM=wayland
  #export GDK_BACKEND=wayland

  # x11 - comment out to use wayland
  export DISPLAY=:0
  export QT_QPA_PLATFORM=xcb
  export GDK_BACKEND=x11

  . "$HOME/.cargo/env"
  ;;
  *rocky*)
  typeset -U PATH path
  path=( "/usr/local/cuda-12.4/bin" "/bin" "/usr/bin" "$path[@]")
  export PATH

  # XDG_RUNTIME_DIR
  export XDG_RUNTIME_DIR="/run/user/`id -u`"

  # dummy-uvm.so for access to the gpu
  export LD_PRELOAD="${HOME}"/.config/gpu/dummy-uvm.so

  # wayland - uncomment to use wayland
  #export WAYLAND_DISPLAY=wayland-0
  #export QT_QPA_PLATFORM=wayland
  #export GDK_BACKEND=wayland

  # x11 - comment out to use wayland
  export DISPLAY=:0
  export QT_QPA_PLATFORM=xcb
  export GDK_BACKEND=x11
  ;;
esac

# xdg directories
export XDG_CONFIG_HOME="$HOME/.config"
export XDG_CACHE_HOME="$HOME/.cache"
export XDG_DATA_HOME="$HOME/.local/share"

# qt5
export QT_QPA_PLATFORMTHEME=qt5ct

just using OSTYPE or uname on its own doesnt work
you have to use them both

 

[SirDice]

Would this help?

% sh
$ . /etc/os-release
$ echo $NAME
FreeBSD
$ echo $ID
freebsd
$ echo $VERSION
14.2-RELEASE-p2
$ echo $VERSION_ID
14.2

Should work on Linux too.

 

[lowkeyloki]

Would this help?

% sh
$ . /etc/os-release
$ echo $NAME
FreeBSD
$ echo $ID
freebsd
$ echo $VERSION
14.2-RELEASE-p2
$ echo $VERSION_ID
14.2

Should work on Linux too.

This does work perfectly well on FreeBSD & Linux.

I use this very technique for OS and distribution specific zsh configuration.

${ID} seems to be the best distinguisher (and, occasionally, ${ID_LIKE}, with closely related linux distros) for my purposes.

There are a couple github repos out there with os-release files from many os's so you can compare them as needed:

GitHub - which-distro/os-release: A collection of /etc/os-release from various distros.

A collection of /etc/os-release from various distros. - which-distro/os-release

github.com

GitHub - chef/os_release: A repo containing the /etc/os-release file from various Linux distros

A repo containing the /etc/os-release file from various Linux distros - chef/os_release

github.com

Also, Chris Siebenmann (Wandering Thoughts) has somewhat recently published a blog entry on managing shell environments on different systems with shared config files, but I can't find the specific post right now.