updatedb

[Alexander Boström]

ons 2005-03-23 klockan 19:32 +0000 skrev Michael A. Peters:
> Is there an easy way to have updatedb run when cron tells it to but NOT  
> at some random DVD buffer underrun coaster making time when it was  
> powered off at cron time?

Well, in general, don't run cron jobs when the machine is doing
something else. The code below won't work very well, but it's a start.
And no, I don't know awk.

$ cat /etc/cron.daily/000-loadwait 
#!/bin/bash

/usr/local/bin/loadwait 0.5 14400

$ cat /usr/local/bin/loadwait
#!/bin/bash

# . is decimal point
export LC_ALL=C

if [ $# -ge 1 ]; then
    maxload=$1
else
    maxload=0.5
fi

if [ $# -ge 2 ]; then
    maxwait=$2
    deadline=$(awk </proc/uptime '{print $1 + '$maxwait'}')
else
    deadline=no
fi

maxsleep=60

while [ $(awk </proc/loadavg '{print $3 < '$maxload'}') -eq 0 ]; do
    if [ $deadline == no ]; then
        sleep $maxsleep
    else
        waitleft=$(awk </proc/uptime '{print '$deadline' - $1}' | sed 's,\..*,,')
        if [ $waitleft -le 0 ]; then
            exit
        fi

        if [ $waitleft -lt $maxsleep ]; then
            sleep $waitleft
        else
            sleep $maxsleep
        fi
    fi
done


/abo