#!/bin/bash
#from http://cvs.sourceforge.net/viewcvs.py/emc/emc_HAL/farm_scripts/run_farm?rev=1.3&view=auto

TRY_CVS


# This script reads the file "trees" in the current directory.  It
# cd's into each subdirectory listed there, does a cvs up, and if
# any files have changed, it calls "build" in that directory, logging
# its output to "build_log"


# This function attempts to do a "cvs up", saving the results in
# cvs_log.  It does not interpret the results.  It returns 0 if
# the cvs command completes successfully, and 1 if it fails or
# times out.
#
function TRY_CVS {
    # invoke the command in the background
    if cvs -q up -dP 1>>cvs_log 2>>cvs_log; then
        echo "CVS_SUCCESS" >>cvs_log
    fi &
    # save the PID of the "if" block above
    BLKPID=$!
    # find the PID of the actual command (not the entire block)
    # (look for parent pid = BLKPID and command = "cvs" )
    CMDPID=`ps o ppid,pid,cmd | awk -- "\\$1 ~ /$BLKPID/ && \\$3 ~ /cvs/ 
{print \\$2}"`
    # loop until the command ends, if it takes too long, kill it
    TIMEOUT=60
    while ps -p $BLKPID &>/dev/null ; do
        # check for timeout
        if [ $TIMEOUT -eq 0 ] ; then
            # find pids of any children of the command
            CHILDPID=`ps -A o ppid,pid | awk -- "\\$1 ~ /\$CMDPID/ { print 
\\$2 }"`
            # stop the command
            kill $CMDPID &>/dev/null
            # stop any children
            for CHILDPID in $CHILDPID ; do
                kill $CHILDPID &>/dev/null
            done
            # wait for the "if" block to finish
            wait $BLKPID &>/dev/null
            # log the timeout
            echo "CVS_TIMEOUT" >>cvs_log
        else
            # wait a bit
            sleep 1
            # decrement TIMEOUT
            TIMEOUT=$((${TIMEOUT}-1))
        fi
    done
    if grep -q CVS_SUCCESS cvs_log ; then return 0 ; else return 1 ; fi
}