# kshrc code to invoke or point to running ssh-agent

# This code is in the public domain.  It was written by J.D. Baldwin
# in August, 2002.  It is not warranted for any purpose whatever, and
# as with any code, you should examine it carefully to determine
# whether it meets your needs before running it on your own machine.

# I would appreciate it if you would leave my name attached to this
# code wherever you use or redistribute it; that way, if someone finds
# a problem with it, I can be notified.

# The idea behind this code is that it comes at the end of your .kshrc
# (or equivalent) file.  It is wrapped by a conditional to determine
# whether you really want ssh-agent running on the host to which you
# are logging in.  (It's unlikely that you want the agent running
# everywhere you go.)  Change the value of AGENT_HOSTS to reflect your
# environment.  Everything else should work without changes, assuming
# all of the programs are in your PATH.

# The basic idea is that the output of ssh-agent is captured on first
# invocation and placed in /tmp/env_ssh.$LOGNAME.  On subsequent shell
# invocations, because that file exists, its contents are sourced into
# the new shell.

# At the end are some aliases to aid you in managing the key cache.
# You should *strongly* consider using a timeout value (with the -t
# option) on your caching.  It isn't in here because Solaris 9's
# ssh-agent doesn't support timeouts.  @#$%!

export HOSTNAME=$(/bin/uname -n)
export AGENT_HOSTS='admin1 admin2 personal_box'

# If host is in AGENT_HOSTS ...

print $AGENT_HOSTS | grep -iw $HOSTNAME >/dev/null 2>&1

if [[ $? -eq 0 ]]    # if current hostname is found ... 
then

# ... then detect / set up / run the ssh-agent

    unset SSH_AUTH_SOCK;
    unset SSH_AGENT_PID;
    
    pgrep ssh-agent >/dev/null 2>&1
    
    if [[ $? -ne 0 ]]
    then
	print -n 'ssh-agent being started ... '
	ssh-agent > /tmp/env_ssh.$LOGNAME
	print 'done.'
	. /tmp/env_ssh.$LOGNAME
    elif [[ ! -f /tmp/env_ssh.$LOGNAME ]]
    then
	print WARNING:  ssh-agent process exists with no /tmp/env_ssh.$LOGNAME file
	print -n 'ssh-agent being killed and restarted ... '
	pkill ssh-agent
	ssh-agent > /tmp/env_ssh.$LOGNAME
	print 'done.'
	. /tmp/env_ssh.$LOGNAME
    else
	print 'ssh-agent already running ... loading environment'
	. /tmp/env_ssh.$LOGNAME
    fi

    # And here are some aliases you may find useful:
    #
    #   skeya - add DSA identity file to cache
    #   skeyl - list identity or identities in cache
    #   skeyd - delete all identities from cache
    #   skeyk - kill the agent

    alias skeya='ssh-add ~/.ssh/id_dsa'
    alias skeyl='ssh-add -l'
    alias skeyd='ssh-add -D'
    alias skeyk='eval $(ssh-agent -k) ; /bin/rm -f /tmp/env_ssh.$LOGNAME'

fi