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ohmyzsh/plugins/ssh-agent/ssh-agent.plugin.zsh
2021-08-26 14:56:22 +02:00

118 lines
3.2 KiB
Bash

# Get the filename to store/lookup the environment from
ssh_env_cache="$HOME/.ssh/environment-$SHORT_HOST"
function _start_agent() {
# Check if ssh-agent is already running
if [[ -f "$ssh_env_cache" ]]; then
. "$ssh_env_cache" > /dev/null
{
[[ "$USERNAME" = root ]] && command ps ax || command ps x
} | command grep ssh-agent | command grep -q $SSH_AGENT_PID && return 0
fi
# Set a maximum lifetime for identities added to ssh-agent
local lifetime
zstyle -s :omz:plugins:ssh-agent lifetime lifetime
# start ssh-agent and setup environment
echo Starting ssh-agent...
ssh-agent -s ${lifetime:+-t} ${lifetime} | sed '/^echo/d' >! "$ssh_env_cache"
chmod 600 "$ssh_env_cache"
. "$ssh_env_cache" > /dev/null
}
function _add_identities() {
local id line sig lines
local -a identities loaded_sigs loaded_ids not_loaded
zstyle -a :omz:plugins:ssh-agent identities identities
# check for .ssh folder presence
if [[ ! -d $HOME/.ssh ]]; then
return
fi
# add default keys if no identities were set up via zstyle
# this is to mimic the call to ssh-add with no identities
if [[ ${#identities} -eq 0 ]]; then
# key list found on `ssh-add` man page's DESCRIPTION section
for id in id_rsa id_dsa id_ecdsa id_ed25519 identity; do
# check if file exists
[[ -f "$HOME/.ssh/$id" ]] && identities+=($id)
done
fi
# get list of loaded identities' signatures and filenames
if lines=$(ssh-add -l); then
for line in ${(f)lines}; do
loaded_sigs+=${${(z)line}[2]}
loaded_ids+=${${(z)line}[3]}
done
fi
# add identities if not already loaded
for id in $identities; do
# check for filename match, otherwise try for signature match
if [[ ${loaded_ids[(I)$HOME/.ssh/$id]} -le 0 ]]; then
sig="$(ssh-keygen -lf "$HOME/.ssh/$id" | awk '{print $2}')"
[[ ${loaded_sigs[(I)$sig]} -le 0 ]] && not_loaded+=("$HOME/.ssh/$id")
fi
done
# abort if no identities need to be loaded
if [[ ${#not_loaded} -eq 0 ]]; then
return
fi
# pass extra arguments to ssh-add
local args
zstyle -a :omz:plugins:ssh-agent ssh-add-args args
# use user specified helper to ask for password (ksshaskpass, etc)
local helper
zstyle -s :omz:plugins:ssh-agent helper helper
if [[ -n "$helper" ]]; then
if [[ -z "${commands[$helper]}" ]]; then
echo "ssh-agent: the helper '$helper' has not been found."
else
SSH_ASKPASS="$helper" ssh-add "${args[@]}" ${^not_loaded} < /dev/null
return $?
fi
fi
ssh-add "${args[@]}" ${^not_loaded}
}
# test if agent-forwarding is enabled
zstyle -b :omz:plugins:ssh-agent agent-forwarding agent_forwarding
# Add a nifty symlink for screen/tmux if agent forwarding
if [[ $agent_forwarding = "yes" && -n "$SSH_AUTH_SOCK" && ! -L "$SSH_AUTH_SOCK" ]]; then
ln -sf "$SSH_AUTH_SOCK" /tmp/ssh-agent-$USERNAME-screen
else
_start_agent
fi
() {
emulate -L zsh
command mkdir "$ZSH_CACHE_DIR/ssh-agent.lock" 2>/dev/null || return
trap "
ret=\$?
command rm -rf '$ZSH_CACHE_DIR/ssh-agent.lock'
unset agent_forwarding ssh_env_cache
unfunction _start_agent _add_identities 2>/dev/null
return \$ret
" EXIT INT QUIT
_add_identities
}
unset agent_forwarding ssh_env_cache
unfunction _start_agent _add_identities