[libvirt] [PATCH] output status information during guest shutdown again

[Gerd v. Egidy]

Since the move to systemd libvirt-guests doesn't output this progress
information anymore. This patch brings back this feature.

It is helpful to show the admin what the system is waiting for and what
is left of the timeout (e.g. for calibrating the shutdown timing of a ups).

Rewriting the current line with \r doesn't work anymore in the context
of systemd. So always write new lines, but move to 5 second intervals
to avoid flooding the console.

This is version 2 of the patch and includes fixes as suggested by Eric Blake.
---
 tools/libvirt-guests.init.sh    | 65 +++++++++++++++++++++++++++++++----------
 tools/libvirt-guests.service.in |  1 +
 2 files changed, 51 insertions(+), 15 deletions(-)

diff --git a/tools/libvirt-guests.init.sh b/tools/libvirt-guests.init.sh
index d5d42d6..99ef331 100644
--- a/tools/libvirt-guests.init.sh
+++ b/tools/libvirt-guests.init.sh
@@ -225,22 +225,27 @@ suspend_guest()
     name=$(guest_name "$uri" "$guest")
     label=$(eval_gettext "Suspending \$name: ")
     bypass=
+    slept=0
     test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
-    printf %s "$label"
+    printf '%s...\n' "$label"
     run_virsh "$uri" managedsave $bypass "$guest" >/dev/null &
     virsh_pid=$!
     while true; do
         sleep 1
         kill -0 "$virsh_pid" >/dev/null 2>&1 || break
-        progress=$(run_virsh_c "$uri" domjobinfo "$guest" 2>/dev/null | \
-                   awk '/^Data processed:/{print $3, $4}')
-        if [ -n "$progress" ]; then
-            printf '\r%s%12s ' "$label" "$progress"
-        else
-            printf '\r%s%-12s ' "$label" "..."
+
+        slept=$(($slept + 1))
+        if [ $(($slept % 5)) -eq 0 ]; then
+            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"
+            else
+                printf '%s%s\n' "$label" "..."
+            fi
         fi
     done
-    retval wait "$virsh_pid" && printf '\r%s%-12s\n' "$label" "$(gettext "done")"
+    retval wait "$virsh_pid" && printf '%s%s\n' "$label" "$(gettext "done")"
 }
 
 # shutdown_guest URI GUEST
@@ -252,30 +257,41 @@ shutdown_guest()
     guest=$2
 
     name=$(guest_name "$uri" "$guest")
-    label=$(eval_gettext "Shutting down \$name: ")
-    printf %s "$label"
+    eval_gettext "Starting shutdown on guest: \$name"
+    echo
     retval run_virsh "$uri" shutdown "$guest" >/dev/null || return
     timeout=$SHUTDOWN_TIMEOUT
     check_timeout=false
     if [ $timeout -gt 0 ]; then
         check_timeout=true
+        format=$(eval_gettext "Waiting for guest %s to shut down, %d seconds left\n")
+    else
+        slept=0
+        format=$(eval_gettext "Waiting for guest %s to shut down\n")
     fi
     while ! $check_timeout || [ "$timeout" -gt 0 ]; do
         sleep 1
         guest_is_on "$uri" "$guest" || return
         "$guest_running" || break
+
         if $check_timeout; then
-            timeout=$((timeout - 1))
-            printf '\r%s%-12d ' "$label" "$timeout"
+            if [ $(($timeout % 5)) -eq 0 ]; then
+                printf "$format" "$name" "$timeout"
+            fi
+            timeout=$(($timeout - 1))
+        else
+            slept=$(($slept + 1))
+            if [ $(($slept % 5)) -eq 0 ]; then
+                printf "$format" "$name"
+            fi
         fi
     done
 
     if guest_is_on "$uri" "$guest"; then
         if "$guest_running"; then
-            printf '\r%s%-12s\n' "$label" \
-                "$(gettext "failed to shutdown in time")"
+            eval_gettext "Shutdown of guest \$name failed to complete in time."
         else
-            printf '\r%s%-12s\n' "$label" "$(gettext "done")"
+            eval_gettext "Shutdown of guest \$name complete."
         fi
     fi
 }
@@ -356,6 +372,10 @@ shutdown_guests_parallel()
     timeout=$SHUTDOWN_TIMEOUT
     if [ $timeout -gt 0 ]; then
         check_timeout=true
+        format=$(eval_gettext "Waiting for %d guests to shut down, %d seconds left\n")
+    else
+        slept=0
+        format=$(eval_gettext "Waiting for %d guests to shut down\n")
     fi
     while [ -n "$on_shutdown" ] || [ -n "$guests" ]; do
         while [ -n "$guests" ] &&
@@ -368,14 +388,29 @@ shutdown_guests_parallel()
             on_shutdown="$on_shutdown $guest"
         done
         sleep 1
+
+        set -- $guests
+        guestcount=$#
+        set -- $on_shutdown
+        shutdowncount=$#
+
         if $check_timeout; then
+            if [ $(($timeout % 5)) -eq 0 ]; then
+                printf "$format" $(($guestcount + $shutdowncount)) "$timeout"
+            fi
             timeout=$(($timeout - 1))
             if [ $timeout -le 0 ]; then
                 eval_gettext "Timeout expired while shutting down domains"; echo
                 RETVAL=1
                 return
             fi
+        else
+            slept=$(($slept + 1))
+            if [ $(($slept % 5)) -eq 0 ]; then
+                printf "$format" $(($guestcount + $shutdowncount))
+            fi
         fi
+
         on_shutdown_prev=$on_shutdown
         on_shutdown=$(check_guests_shutdown "$uri" "$on_shutdown")
         print_guests_shutdown "$uri" "$on_shutdown_prev" "$on_shutdown"
diff --git a/tools/libvirt-guests.service.in b/tools/libvirt-guests.service.in
index db28f3f..0f0c41c 100644
--- a/tools/libvirt-guests.service.in
+++ b/tools/libvirt-guests.service.in
@@ -10,6 +10,7 @@ ExecStart=/etc/init.d/libvirt-guests start
 ExecStop=/etc/init.d/libvirt-guests stop
 Type=oneshot
 RemainAfterExit=yes
+StandardOutput=journal+console
 
 [Install]
 WantedBy=multi-user.target
-- 
1.7.11.4