libvirt-guests: implement START_DELAY

Allow libvirt-guests to stage a delay between guest startups,
to avoid system load caused by back-to-back startup.

AUTHORS

@@ -165,6 +165,7 @@ Patches have also been contributed by:
   Thibault VINCENT     <thibault.vincent@smartjog.com>
   Naoya Horiguchi      <n-horiguchi@ah.jp.nec.com>
   Jesse Cook           <code.crashenx@gmail.com>
+  Alexander Todorov    <atodorov@otb.bg>
 
   [....send patches to get your name here....]
 

tools/libvirt-guests.init.sh

@@ -42,6 +42,7 @@ URIS=default
 ON_BOOT=start
 ON_SHUTDOWN=suspend
 SHUTDOWN_TIMEOUT=0
+START_DELAY=0
 
 test -f "$sysconfdir"/sysconfig/libvirt-guests &&
     . "$sysconfdir"/sysconfig/libvirt-guests
@@ -141,6 +142,7 @@ start() {
         return 0
     fi
 
+    isfirst=true
     while read uri list; do
         configured=false
         set -f
@@ -165,6 +167,11 @@ start() {
                 if "$guest_running"; then
                     gettext "already active"; echo
                 else
+                    if "$isfirst"; then
+                        isfirst=false
+                    else
+                        sleep $START_DELAY
+                    fi
                     retval run_virsh "$uri" start "$name" >/dev/null && \
                     gettext "done"; echo
                 fi

tools/libvirt-guests.sysconf

@@ -10,6 +10,9 @@
 #           libvirtd
 #ON_BOOT=start
 
+# number of seconds to wait between each guest start
+#START_DELAY=0
+
 # action taken on host shutdown
 # - suspend   all running guests are suspended using virsh managedsave
 # - shutdown  all running guests are asked to shutdown. Please be careful with