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qemu-ga: Optimize freeze-hook script logic of logging error

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Make sure the error log of fsfreeze hooks
when freeze/thaw/snapshot could be logged
to system logs if the default logfile of
qga can't be written or other situations

Signed-off-by: Dehan Meng <demeng@redhat.com>
Reviewed-by: Yan Vugenfirer <yvugenfi@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Message-ID: <20241225083744.277374-1-demeng@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
This commit is contained in:
Dehan Meng 2024-12-25 16:37:44 +08:00 • committed by Konstantin Kostiuk
parent 5288d9d085
commit 85978dfb6b
1 changed files with 32 additions and 4 deletions
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36
scripts/qemu-guest-agent/fsfreeze-hook
View file

@ -19,15 +19,43 @@ is_ignored_file() {
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
printf "$(date): execute $file $@\n" >>$LOGFILE
"$file" "$@" >>$LOGFILE 2>&1
STATUS=$?
printf "$(date): $file finished with status=$STATUS\n" >>$LOGFILE
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