1#!/bin/sh 2 3# This script is executed when a guest agent receives fsfreeze-freeze and 4# fsfreeze-thaw command, if it is specified in --fsfreeze-hook (-F) 5# option of qemu-ga or placed in default path (/etc/qemu/fsfreeze-hook). 6# When the agent receives fsfreeze-freeze request, this script is issued with 7# "freeze" argument before the filesystem is frozen. And for fsfreeze-thaw 8# request, it is issued with "thaw" argument after filesystem is thawed. 9 10LOGFILE=/var/log/qga-fsfreeze-hook.log 11FSFREEZE_D=$(dirname -- "$0")/fsfreeze-hook.d 12 13# Check whether file $1 is a backup or rpm-generated file and should be ignored 14is_ignored_file() { 15 case "$1" in 16 *~ | *.bak | *.orig | *.rpmnew | *.rpmorig | *.rpmsave | *.sample | *.dpkg-old | *.dpkg-new | *.dpkg-tmp | *.dpkg-dist | *.dpkg-bak | *.dpkg-backup | *.dpkg-remove) 17 return 0 ;; 18 esac 19 return 1 20} 21 22USE_SYSLOG=0 23# if log file is not writable, fallback to syslog 24[ ! -w "$LOGFILE" ] && USE_SYSLOG=1 25# try to update log file and fallback to syslog if it fails 26touch "$LOGFILE" &>/dev/null || USE_SYSLOG=1 27 28# Ensure the log file is writable, fallback to syslog if not 29log_message() { 30 local message="$1" 31 if [ "$USE_SYSLOG" -eq 0 ]; then 32 printf "%s: %s\n" "$(date)" "$message" >>"$LOGFILE" 33 else 34 logger -t qemu-ga-freeze-hook "$message" 35 fi 36} 37 38# Iterate executables in directory "fsfreeze-hook.d" with the specified args 39[ ! -d "$FSFREEZE_D" ] && exit 0 40 41for file in "$FSFREEZE_D"/* ; do 42 is_ignored_file "$file" && continue 43 [ -x "$file" ] || continue 44 45 log_message "Executing $file $@" 46 if [ "$USE_SYSLOG" -eq 0 ]; then 47 "$file" "$@" >>"$LOGFILE" 2>&1 48 STATUS=$? 49 else 50 "$file" "$@" 2>&1 | logger -t qemu-ga-freeze-hook 51 STATUS=${PIPESTATUS[0]} 52 fi 53 54 if [ $STATUS -ne 0 ]; then 55 log_message "Error: $file finished with status=$STATUS" 56 else 57 log_message "$file finished successfully" 58 fi 59done 60 61exit 0 62