oh-my-zsh/plugins/ssh-agent/ssh-agent.plugin.zsh

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#
# INSTRUCTIONS
#
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# To enable agent forwarding support add the following to
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# your .zshrc file:
#
# zstyle :omz:plugins:ssh-agent agent-forwarding on
#
# To load multiple identities use the identities style, For
# example:
#
# zstyle :omz:plugins:ssh-agent identities id_rsa id_rsa2 id_github
#
# To set the maximum lifetime of the identities, use the
# lifetime style. The lifetime may be specified in seconds
# or as described in sshd_config(5) (see TIME FORMATS)
# If left unspecified, the default lifetime is forever.
#
# zstyle :omz:plugins:ssh-agent lifetime 4h
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#
# CREDITS
#
# Based on code from Joseph M. Reagle
# http://www.cygwin.com/ml/cygwin/2001-06/msg00537.html
#
# Agent forwarding support based on ideas from
# Florent Thoumie and Jonas Pfenniger
#
local _plugin__ssh_env
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local _plugin__forwarding
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function _plugin__start_agent()
{
local -a identities
local lifetime
zstyle -s :omz:plugins:ssh-agent lifetime lifetime
# start ssh-agent and setup environment
/usr/bin/env ssh-agent ${lifetime:+-t} ${lifetime} | sed 's/^echo/#echo/' > ${_plugin__ssh_env}
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chmod 600 ${_plugin__ssh_env}
. ${_plugin__ssh_env} > /dev/null
# load identies
zstyle -a :omz:plugins:ssh-agent identities identities
echo starting ssh-agent...
/usr/bin/ssh-add $HOME/.ssh/${^identities}
}
# Get the filename to store/lookup the environment from
if (( $+commands[scutil] )); then
# It's OS X!
_plugin__ssh_env="$HOME/.ssh/environment-$(scutil --get ComputerName)"
else
_plugin__ssh_env="$HOME/.ssh/environment-$HOST"
fi
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# test if agent-forwarding is enabled
zstyle -b :omz:plugins:ssh-agent agent-forwarding _plugin__forwarding
if [[ ${_plugin__forwarding} == "yes" && -n "$SSH_AUTH_SOCK" ]]; then
# Add a nifty symlink for screen/tmux if agent forwarding
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[[ -L $SSH_AUTH_SOCK ]] || ln -sf "$SSH_AUTH_SOCK" /tmp/ssh-agent-$USER-screen
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elif [ -f "${_plugin__ssh_env}" ]; then
# Source SSH settings, if applicable
. ${_plugin__ssh_env} > /dev/null
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ps x | grep ${SSH_AGENT_PID} | grep ssh-agent > /dev/null || {
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_plugin__start_agent;
}
else
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_plugin__start_agent;
fi
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# tidy up after ourselves
unfunction _plugin__start_agent
unset _plugin__forwarding
unset _plugin__ssh_env