attach-ssh-agent.sh - Attach ssh-agent

attach-ssh-agent.sh

#!/usr/bin/env bash
#
# attach-ssh-agent.sh - Attach ssh-agent
# Copyright (c) 2020 Koichi OKADA. All rights reserved.
# This script is distributed under the MIT License.
#
# Usage:
#   Include from .bashrc as:
#   . attach-ssh-agent.sh
#

#cat <<EOD >/dev/null
function is_alive_ssh_agent ()
{
  [ -S "$SSH_AUTH_SOCK" ] && echo|nc -w 1 -U "$SSH_AUTH_SOCK"
}

function attach_ssh_agent ()
{
  [ -n "$SSH_CLIENT" ] && return
  is_alive_ssh_agent && return
  [ -e ~/.ssh/.ssh-agent.bash ] && . ~/.ssh/.ssh-agent.bash
  is_alive_ssh_agent && return
  ( killall -u $USER ssh-agent & ) >&/dev/null
  [ -d  ~/.ssh ] || {
    mkdir -p ~/.ssh && chmod 700 ~/.ssh || {
      echo -e "${SGR_error}Error:${SGR_rest} ~/.ssh could not be configured."
      ls -ld ~/.ssh
      return 1
    }
  }
  ssh-agent | grep -Ev '^echo '    > ~/.ssh/.ssh-agent.bash
  [ -e ~/.ssh/.ssh-agent.bash ] && . ~/.ssh/.ssh-agent.bash
  is_alive_ssh_agent && return

  local SGR_reset='\e[0m'
  local SGR_error='\e[31;1m'
  echo -e "${SGR_error}Error:${SGR_rest} Couldn't attach ssh-agent."
  return 1
}

attach_ssh_agent
#EOD