Restartibility Functionality.... Post: 302072154

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Top Forums Shell Programming and Scripting Restartibility Functionality.... Post 302072154 by thestevew on Friday 28th of April 2006 06:17:48 AM

04-28-2006

Registered User

I recently wrote a script to install software releases that needed to be restartable. There are lots of steps, so I didn't want to have to repeat code (even though most is in separate functions) so it uses a pointer to the current step and compares this with an optional restart point provided as a run-time parameter. The bare bones are:

Code:

Code

# Set up defaults
restartpoint=0
step=0

# parse run time parameters
while getopts :d:l:r:s:uh OPTION ...
do
  case $OPTION in
...
  s) restartpoint=$OPTARG;;
...
     exit 0;
  esac
done

while :
do
  if [ $restartpoint -le $step ]; then
    case $step in
    0) {
	Code for step zero
       };;
    1) {
	Code for step 1
       };;
... code for rest of steps here ...
    *) break;;
    esac
  else
    print "Step $step skipped"
  fi
  step=$(($step + 1))
done
... cleanup code here

I wanted to control restarts automatically, but you could automate the restart by writing the last successfully completed step to a file and read this at the start of the script to work out the restart point.

Does this help?

thestevew

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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)

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