[libvirt] [PATCH] libvirt-guests: emit most messages to stderr
Michael Chapman
mike at very.puzzling.org
Thu Dec 31 05:53:54 UTC 2015
Some of the shell functions in this script (e.g. check_guests_shutdown)
produce output that is captured and processed by other parts of the
script. Any error messages from these shell functions must go to stderr,
not stdout.
Rather than trying to determine which messages are safe for stdout and
which are not (and maintaining this safety as the script is refactored),
simplify things by emitting all messages to stderr, except for the
output from gueststatus(), rh_status() and usage().
Signed-off-by: Michael Chapman <mike at very.puzzling.org>
---
tools/libvirt-guests.sh.in | 94 +++++++++++++++++++++++-----------------------
1 file changed, 47 insertions(+), 47 deletions(-)
diff --git a/tools/libvirt-guests.sh.in b/tools/libvirt-guests.sh.in
index 7f74b85..80b1ec7 100644
--- a/tools/libvirt-guests.sh.in
+++ b/tools/libvirt-guests.sh.in
@@ -92,16 +92,16 @@ test_connect()
i=${CONNECT_RETRIES}
while [ $i -gt 0 ]; do
- run_virsh "$uri" connect 2>/dev/null
+ run_virsh "$uri" connect >/dev/null 2>/dev/null
if [ $? -eq 0 ]; then
return 0;
fi
sleep ${RETRIES_SLEEP}
- eval_gettext "Unable to connect to libvirt currently. Retrying .. \$i"
+ eval_gettext "Unable to connect to libvirt currently. Retrying .. \$i" >&2
i=$(($i-1))
done
- eval_gettext "Can't connect to \$uri. Skipping."
- echo
+ eval_gettext "Can't connect to \$uri. Skipping." >&2
+ echo >&2
return 1
}
@@ -163,8 +163,8 @@ start() {
[ -f "$LISTFILE" ] || { started; return 0; }
if [ "x$ON_BOOT" != xstart ]; then
- gettext "libvirt-guests is configured not to start any guests on boot"
- echo
+ gettext "libvirt-guests is configured not to start any guests on boot" >&2
+ echo >&2
rm -f "$LISTFILE"
started
return 0
@@ -187,19 +187,19 @@ start() {
done
set +f
if ! "$configured"; then
- eval_gettext "Ignoring guests on \$uri URI"; echo
+ eval_gettext "Ignoring guests on \$uri URI" >&2; echo >&2
continue
fi
test_connect "$uri" || continue
- eval_gettext "Resuming guests on \$uri URI..."; echo
+ eval_gettext "Resuming guests on \$uri URI..." >&2; echo >&2
for guest in $list; do
name=$(guest_name "$uri" "$guest")
- eval_gettext "Resuming guest \$name: "
+ eval_gettext "Resuming guest \$name: " >&2
if guest_is_on "$uri" "$guest"; then
if "$guest_running"; then
- gettext "already active"; echo
+ gettext "already active" >&2; echo >&2
else
if "$isfirst"; then
isfirst=false
@@ -208,7 +208,7 @@ start() {
fi
retval run_virsh "$uri" start $bypass "$name" \
>/dev/null && \
- gettext "done"; echo
+ gettext "done" >&2; echo >&2
if "$sync_time"; then
run_virsh "$uri" domtime --sync "$name" >/dev/null
fi
@@ -234,7 +234,7 @@ suspend_guest()
bypass=
slept=0
test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
- printf '%s...\n' "$label"
+ printf '%s...\n' "$label" >&2
run_virsh "$uri" managedsave $bypass "$guest" >/dev/null &
virsh_pid=$!
while true; do
@@ -246,9 +246,9 @@ suspend_guest()
progress=$(run_virsh_c "$uri" domjobinfo "$guest" 2>/dev/null | \
awk '/^Data processed:/{print $3, $4}')
if [ -n "$progress" ]; then
- printf '%s%s\n' "$label" "$progress"
+ printf '%s%s\n' "$label" "$progress" >&2
else
- printf '%s%s\n' "$label" "..."
+ printf '%s%s\n' "$label" "..." >&2
fi
fi
done
@@ -264,8 +264,8 @@ shutdown_guest()
guest=$2
name=$(guest_name "$uri" "$guest")
- eval_gettext "Starting shutdown on guest: \$name"
- echo
+ eval_gettext "Starting shutdown on guest: \$name" >&2
+ echo >&2
retval run_virsh "$uri" shutdown "$guest" >/dev/null || return
timeout=$SHUTDOWN_TIMEOUT
check_timeout=false
@@ -283,24 +283,24 @@ shutdown_guest()
if $check_timeout; then
if [ $(($timeout % 5)) -eq 0 ]; then
- printf "$format" "$name" "$timeout"
+ printf "$format" "$name" "$timeout" >&2
fi
timeout=$(($timeout - 1))
else
slept=$(($slept + 1))
if [ $(($slept % 5)) -eq 0 ]; then
- printf "$format" "$name"
+ printf "$format" "$name" >&2
fi
fi
done
if guest_is_on "$uri" "$guest"; then
if "$guest_running"; then
- eval_gettext "Shutdown of guest \$name failed to complete in time."
+ eval_gettext "Shutdown of guest \$name failed to complete in time." >&2
else
- eval_gettext "Shutdown of guest \$name complete."
+ eval_gettext "Shutdown of guest \$name complete." >&2
fi
- echo
+ echo >&2
fi
}
@@ -313,8 +313,8 @@ shutdown_guest_async()
guest=$2
name=$(guest_name "$uri" "$guest")
- eval_gettext "Starting shutdown on guest: \$name"
- echo
+ eval_gettext "Starting shutdown on guest: \$name" >&2
+ echo >&2
retval run_virsh "$uri" shutdown "$guest" > /dev/null
}
@@ -337,8 +337,8 @@ check_guests_shutdown()
guests_up=
for guest in $guests; do
if ! guest_is_on "$uri" "$guest" >/dev/null 2>&1; then
- eval_gettext "Failed to determine state of guest: \$guest. Not tracking it anymore."
- echo
+ eval_gettext "Failed to determine state of guest: \$guest. Not tracking it anymore." >&2
+ echo >&2
continue
fi
if "$guest_running"; then
@@ -363,8 +363,8 @@ print_guests_shutdown()
esac
name=$(guest_name "$uri" "$guest")
- eval_gettext "Shutdown of guest \$name complete."
- echo
+ eval_gettext "Shutdown of guest \$name complete." >&2
+ echo >&2
done
}
@@ -404,18 +404,18 @@ shutdown_guests_parallel()
if $check_timeout; then
if [ $(($timeout % 5)) -eq 0 ]; then
- printf "$format" $(($guestcount + $shutdowncount)) "$timeout"
+ printf "$format" $(($guestcount + $shutdowncount)) "$timeout" >&2
fi
timeout=$(($timeout - 1))
if [ $timeout -le 0 ]; then
- eval_gettext "Timeout expired while shutting down domains"; echo
+ eval_gettext "Timeout expired while shutting down domains" >&2; echo >&2
RETVAL=1
return
fi
else
slept=$(($slept + 1))
if [ $(($slept % 5)) -eq 0 ]; then
- printf "$format" $(($guestcount + $shutdowncount))
+ printf "$format" $(($guestcount + $shutdowncount)) >&2
fi
fi
@@ -435,8 +435,8 @@ stop() {
if [ "x$ON_SHUTDOWN" = xshutdown ]; then
suspending=false
if [ $SHUTDOWN_TIMEOUT -lt 0 ]; then
- gettext "SHUTDOWN_TIMEOUT must be equal or greater than 0"
- echo
+ gettext "SHUTDOWN_TIMEOUT must be equal or greater than 0" >&2
+ echo >&2
RETVAL=6
return
fi
@@ -449,21 +449,21 @@ stop() {
test_connect "$uri" || continue
- eval_gettext "Running guests on \$uri URI: "
+ eval_gettext "Running guests on \$uri URI: " >&2
list=$(list_guests "$uri")
if [ $? -eq 0 ]; then
empty=true
for uuid in $list; do
- "$empty" || printf ", "
- printf %s "$(guest_name "$uri" "$uuid")"
+ "$empty" || printf ", " >&2
+ printf %s "$(guest_name "$uri" "$uuid")" >&2
empty=false
done
if "$empty"; then
- gettext "no running guests."
+ gettext "no running guests." >&2
fi
- echo
+ echo >&2
fi
if "$suspending"; then
@@ -472,26 +472,26 @@ stop() {
empty=true
for uuid in $transient; do
if "$empty"; then
- eval_gettext "Not suspending transient guests on URI: \$uri: "
+ eval_gettext "Not suspending transient guests on URI: \$uri: " >&2
empty=false
else
- printf ", "
+ printf ", " >&2
fi
- printf %s "$(guest_name "$uri" "$uuid")"
+ printf %s "$(guest_name "$uri" "$uuid")" >&2
done
- echo
+ echo >&2
# reload domain list to contain only persistent guests
list=$(list_guests "$uri" "--persistent")
if [ $? -ne 0 ]; then
- eval_gettext "Failed to list persistent guests on \$uri"
- echo
+ eval_gettext "Failed to list persistent guests on \$uri" >&2
+ echo >&2
RETVAL=1
set +f
return
fi
else
- gettext "Failed to list transient guests"
- echo
+ gettext "Failed to list transient guests" >&2
+ echo >&2
RETVAL=1
set +f
return
@@ -507,9 +507,9 @@ stop() {
if [ -s "$LISTFILE" ]; then
while read uri list; do
if "$suspending"; then
- eval_gettext "Suspending guests on \$uri URI..."; echo
+ eval_gettext "Suspending guests on \$uri URI..." >&2; echo >&2
else
- eval_gettext "Shutting down guests on \$uri URI..."; echo
+ eval_gettext "Shutting down guests on \$uri URI..." >&2; echo >&2
fi
if [ "$PARALLEL_SHUTDOWN" -gt 1 ] &&
--
2.4.3
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