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prezto/modules/ssh/init.zsh

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#
# Provides for an easier use of SSH by setting up ssh-agent.
#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
# Return if requirements are not found.
if (( ! $+commands[ssh-agent] )); then
return 1
fi
if [[ "$OSTYPE" == darwin* ]]; then
_ssh_add_cmd="ssh-add -A"
else
_ssh_add_cmd="ssh-add"
fi
# Set the path to the SSH directory.
_ssh_dir="$HOME/.ssh"
# Set the path to the environment file if not set by another module.
_ssh_agent_env="${_ssh_agent_env:-${TMPDIR:-/tmp}/ssh-agent.env}"
# Set the path to the persistent authentication socket.
_ssh_agent_sock="${TMPDIR:-/tmp}/ssh-agent.sock"
# Start ssh-agent if not started.
if [[ ! -S "$SSH_AUTH_SOCK" ]]; then
# Export environment variables.
source "$_ssh_agent_env" 2> /dev/null
# Start ssh-agent if not started.
if ! ps -U "$LOGNAME" -o pid,ucomm | grep -q -- "${SSH_AGENT_PID:--1} ssh-agent"; then
eval "$(ssh-agent | sed '/^echo /d' | tee "$_ssh_agent_env")"
fi
fi
# Create a persistent SSH authentication socket.
if [[ -S "$SSH_AUTH_SOCK" && "$SSH_AUTH_SOCK" != "$_ssh_agent_sock" ]]; then
ln -sf "$SSH_AUTH_SOCK" "$_ssh_agent_sock"
export SSH_AUTH_SOCK="$_ssh_agent_sock"
fi
# Load identities.
if ssh-add -l 2>&1 | grep -q 'The agent has no identities'; then
zstyle -a ':prezto:module:ssh:load' identities '_ssh_identities'
if (( ${#_ssh_identities} > 0 )); then
${(s: :)_ssh_add_cmd} "$_ssh_dir/${^_ssh_identities[@]}" 2> /dev/null
else
${(s: :)_ssh_add_cmd} 2> /dev/null
fi
fi
# Clean up.
unset _ssh_{dir,identities} _ssh_agent_{env,sock} _ssh_add_cmd