dq-tail

#!/bin/bash

D=$(cd `dirname $0` && pwd)
BDIR=$D/jobs/backend

SSH="ssh -q -x -o BatchMode=yes -o ConnectTimeout=10 -o ServerAliveInterval=3"

jobspec="$1"
shift
tailargs="$@"

if [ "x$jobspec" = "x" ]; then
    jobspec=$USER
fi

BJOBS=$(ls -1 $BDIR | grep "^$jobspec-")
BCNT=$(echo "$BJOBS" | grep . | wc -l)
if [ $BCNT -eq 0 ]; then
    BJOBS=$(ls -1 $BDIR | grep "^$jobspec")
    BCNT=$(echo "$BJOBS" | grep . | wc -l)
    if [ $BCNT -eq 0 ]; then
	BJOBS=$(ls -1 $BDIR | grep "$jobspec")
	BCNT=$(echo "$BJOBS" | grep . | wc -l)
    fi
fi

if [ $BCNT -gt 1 ]; then
    echo "Ambiguous job specification '$jobspec'. Multiple possibilities:"
    echo "$BJOBS"
    exit 1
fi


if [ $BCNT -eq 1 ]; then
    JOBID=$BJOBS
    JOBDIR=$BDIR/$JOBID

    U=$(cat $JOBDIR/user.txt)
    H=$(cat $JOBDIR/host.txt)
 
    if ! flock -nx $JOBDIR/lock true; then
	echo "Flushing logs of $JOBID"
	KRB5CCNAME=$JOBDIR/ticket.krb5 $SSH -t $U@$H screen -S dq-$JOBID -X colon "logfile flush 1
"
    fi

    tail $tailargs $JOBDIR/screenlog.0 
    exit 0
fi

echo "Could not find matching job for '$jobspec'"