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July 12, 2010 05:34
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#!/bin/bash | |
# | |
# Swap/Roll a logfile | |
# | |
# Usage: <old logfile> <new logfile> [ optional pids ] | |
# ./swap.sh /var/log/logfile /tmp/logfile [pids] | |
# | |
# Author: Robert McKay <rob...@mckay.com> | |
# Date: Tue Aug 14 13:36:35 BST 2007 | |
# | |
# Update: Added usage message when needed, a fuser format fix, | |
# some whitespace cleanup, and a localization fix. | |
# Ingvar Hagelund <ingvar@redpill-linpro.com> | |
# Date: Sat Jul 10 02:11:49 CEST 2010 | |
if [ "$2" = "" ]; then | |
echo "Usage: $0 /path/to/oldfile /path/to/newfile [pids] | |
Example: $0 /var/log/somedaemon.log /var/log/newvolume/somedaemon.log 1234 | |
Example: $0 /dev/pts/53 /dev/null 1234 | |
" | |
exit 0 | |
fi | |
if gdb --version > /dev/null 2>&1; then | |
true | |
else | |
echo "Unable to find gdb." | |
exit 1 | |
fi | |
src=$1 | |
dst=$2 | |
shift; shift | |
pids=$* | |
for pid in ${pids:=$( /sbin/fuser $src | cut -d ':' -f 2 )}; | |
do | |
echo "src=$src, dst=$dst" | |
echo "$src has $pid using it" | |
( | |
echo "attach $pid" | |
echo 'call open("'$dst'", 66, 0666)' | |
for ufd in $(LANG=C ls -l /proc/$pid/fd | grep $src\$ | awk ' { print $9; } '); | |
do | |
echo 'call dup2($1,'"$ufd"')' | |
done | |
echo 'call close($1)' | |
echo 'detach' | |
echo 'quit' | |
sleep 5 | |
) | gdb -q -x - | |
done |
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