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

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typeset _agent_forwarding _ssh_env_cache
function _start_agent() {
local lifetime
local -a identities
# start ssh-agent and setup environment
zstyle -s :omz:plugins:ssh-agent lifetime lifetime
ssh-agent -s ${lifetime:+-t} ${lifetime} | sed 's/^echo/#echo/' >! $_ssh_env_cache
chmod 600 $_ssh_env_cache
. $_ssh_env_cache > /dev/null
# load identies
zstyle -a :omz:plugins:ssh-agent identities identities
echo starting ssh-agent...
ssh-add $HOME/.ssh/${^identities}
}
# Get the filename to store/lookup the environment from
_ssh_env_cache="$HOME/.ssh/environment-$SHORT_HOST"
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# test if agent-forwarding is enabled
zstyle -b :omz:plugins:ssh-agent agent-forwarding _agent_forwarding
if [[ $_agent_forwarding == "yes" && -n "$SSH_AUTH_SOCK" ]]; then
# Add a nifty symlink for screen/tmux if agent forwarding
[[ -L $SSH_AUTH_SOCK ]] || ln -sf "$SSH_AUTH_SOCK" /tmp/ssh-agent-$USER-screen
elif [[ -f "$_ssh_env_cache" ]]; then
# Source SSH settings, if applicable
. $_ssh_env_cache > /dev/null
ps x | grep ssh-agent | grep -q $SSH_AGENT_PID || {
_start_agent
}
else
_start_agent
fi
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# tidy up after ourselves
unset _agent_forwarding _ssh_env_cache
unfunction _start_agent