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#!/bin/sh
# This script is executed when a guest agent receives fsfreeze-freeze and
# fsfreeze-thaw command, if it is specified in --fsfreeze-hook (-F)
# option of qemu-ga or placed in default path (/etc/qemu/fsfreeze-hook).
# When the agent receives fsfreeze-freeze request, this script is issued with
# "freeze" argument before the filesystem is frozen. And for fsfreeze-thaw
# request, it is issued with "thaw" argument after filesystem is thawed.
LOGFILE=/var/log/qga-fsfreeze-hook.log
FSFREEZE_D=$(dirname -- "$0")/fsfreeze-hook.d
# Check whether file $1 is a backup or rpm-generated file and should be ignored
is_ignored_file() {
case "$1" in
*~ | *.bak | *.orig | *.rpmnew | *.rpmorig | *.rpmsave | *.sample | *.dpkg-old | *.dpkg-new | *.dpkg-tmp | *.dpkg-dist | *.dpkg-bak | *.dpkg-backup | *.dpkg-remove)
return 0 ;;
esac
return 1
}
USE_SYSLOG=0
# if log file is not writable, fallback to syslog
[ ! -w "$LOGFILE" ] && USE_SYSLOG=1
# try to update log file and fallback to syslog if it fails
touch "$LOGFILE" &>/dev/null || USE_SYSLOG=1
# Ensure the log file is writable, fallback to syslog if not
log_message() {
local message="$1"
if [ "$USE_SYSLOG" -eq 0 ]; then
printf "%s: %s\n" "$(date)" "$message" >>"$LOGFILE"
else
logger -t qemu-ga-freeze-hook "$message"
fi
}
# Iterate executables in directory "fsfreeze-hook.d" with the specified args
[ ! -d "$FSFREEZE_D" ] && exit 0
for file in "$FSFREEZE_D"/* ; do
is_ignored_file "$file" && continue
[ -x "$file" ] || continue
log_message "Executing $file $@"
if [ "$USE_SYSLOG" -eq 0 ]; then
"$file" "$@" >>"$LOGFILE" 2>&1
STATUS=$?
else
"$file" "$@" 2>&1 | logger -t qemu-ga-freeze-hook
STATUS=${PIPESTATUS[0]}
fi
if [ $STATUS -ne 0 ]; then
log_message "Error: $file finished with status=$STATUS"
else
log_message "$file finished successfully"
fi
done
exit 0
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