Partial zsh Config

Here follows some of my zsh configuration, as promised in my previous post. Please see that previous post for understanding where to place these and how they are used.

First out is zshenv.illumos which gets conditionally included on illumos (solaris) hosts. It does nothing more than adding a few directories to the start of the list of directories searched for executables, given that those paths exist.


# vim: filetype=zsh sw=2 et

# /opt/onbld/bin/i386 /opt/ooce/docbook-xsl/tools /usr/xpg4/bin /usr/share/lib

for _path in \
    '/usr/gnu/bin' \
    '/usr/ccs/bin' \
    '/opt/ooce/bin'
do
  if [ "${PATH//${_path}/}" = "${PATH}" ] && [ -e "${_path}" ]; then
    PATH="${_path}:${PATH}"
  fi
done

unset _path
export PATH

The second file here zshenv.cloud creates a few convenience functions for easily finding cloud computing instances. The stack exchange links in the comments are pretty much where I have copy'n'pasted the oneliners from, and they are mostly used by my secure shell configuration.

# vim: filetype=zsh sw=2 et

# https://stackoverflow.com/q/25922609/#50535409
#   does-google-publish-a-dns-record-for-google-compute-engine-instances
get_gce_ip() {
  local instance="${1%%.*}"

  gcloud compute instances list --filter="$instance" \
      --format='value(networkInterfaces[0].accessConfigs[0].natIP)'
}

# https://serverfault.com/q/734237/
#   is-there-a-command-to-list-aws-instances-that-results-in-short-output
get_aws_fqdn() {
  local instance="${1%%.*}"

  aws ec2 describe-instances --filters "Name=tag:Name,Values=${instance}" \
      --output text --query 'Reservations[*].Instances[*].[PublicDnsName]'
}

get_linode_ip() {
  local instance="${1%%.*}"

  linode-cli --json linodes list --label "${instance}" |
      jq --raw-output '.[0].ipv4[0]'
}

In order to make your linodes, ec2:s and gce:s conveniently available under some fake top level domains, just add the corresponding cloud.conf somewhere and include it from .ssh/config:

# vim: ft=sshconfig sw=4

Host *.aws
    ProxyCommand nc $( get_aws_fqdn "%h" ) %p

# https://stackoverflow.com/q/25922609/#50535409-dns-record-for-gce-instance
Host *.googl
    ProxyCommand nc $( get_gce_ip "%h" ) %p

Host *.linode
    ProxyCommand nc $( get_linode_ip "%h" ) %p

The third and last zsh config file in this post is zshrc.prompt which is only used for interactive shells. The manual does a better job than I could do at describing how the percent preceeded characters are expanded. One might maybe start out reading it with the understanding that a ternary operator style expression is used to make the prompt red when the previous command failed.

# vim: filetype=zsh sw=2 et

PROMPT="%(?..%S%F{red})%D{%Y%m%d}|%T|%!|%m%#"
RPROMPT="%(?..%S%F{red})"

PROMPT+="%f%s "
export PROMPT RPROMPT

Clearly these are not my full set of zsh configuration files, but a bite sized chunk. Maybe there will be more in the future, maybe not. To some degree that depends on whether these first two zsh posts are well recieved by those who initially requested the topic.