From 6fb8e08e6f84ba3cce1c13c12adb09548ab2312f Mon Sep 17 00:00:00 2001
From: Evan Broder <broder@mit.edu>
Date: Fri, 31 Oct 2008 09:47:29 -0400
Subject: [PATCH] Automatically startup sysvms if they're not running already

svn path=/trunk/packages/invirt-xen-config/; revision=1457
---
 debian/changelog              |    6 ++++++
 debian/invirt-xen-config.init |   47 +++++++++++++++++++++++++++++++++++------
 2 files changed, 47 insertions(+), 6 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index 9ea54c4..d611c42 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+invirt-xen-config (0.0.11) unstable; urgency=low
+
+  * Automatically startup sysvms if they're not running already
+
+ -- Evan Broder <broder@mit.edu>  Fri, 31 Oct 2008 09:47:15 -0400
+
 invirt-xen-config (0.0.10) unstable; urgency=low
 
   * Generate config files for sysvms
diff --git a/debian/invirt-xen-config.init b/debian/invirt-xen-config.init
index 007abb1..519829e 100755
--- a/debian/invirt-xen-config.init
+++ b/debian/invirt-xen-config.init
@@ -13,21 +13,56 @@ PACKAGE=invirt-xen-config
 NAME="$PACKAGE"
 DESC="Invirt Xen host"
 PARENTPACKAGE=xend
-GEN_FILES=(
-    /etc/xen/xend-config.sxp.invirt
-    /etc/xen/sysvms/s_master
-    /etc/xen/sysvms/s_remote
-    /etc/xen/sysvms/s_console
-    )
+GEN_FILES=(/etc/xen/xend-config.sxp.invirt)
+SYSVMS=(s_master s_remote s_console)
+i=1
+for vm in "${SYSVMS[@]}"; do
+    GEN_FILES[$i] = "$vm"
+    i=$((i + 1)
+done
 
 dpkg -s "$PACKAGE" >/dev/null 2>/dev/null || exit 0
 
 . /lib/init/gen-files.sh
 . /lib/init/std-init.sh
 
+start_sysvm() {
+    # Attempt to start a sysvm, but only if it's not running already
+    # somewhere on the cluster
+    
+    VM="$1"
+    DISK="/dev/xenvg/${VM}_hda"
+    
+    # Don't bother trying to start the VM if it's already running
+    if xm list "$1" >/dev/null 2>&1; then
+        return 1
+    fi
+    
+    if lvchange -a n "$DISK" >/dev/null 2>&1 && lvchange -a ey "$DISK" >/dev/null 2>&1; then
+        # If we can lock on the VM's disk, then the VM isn't running
+        [ "$VERBOSE" != no ] && log_daemon_msg "Starting sysvm $VM"
+        xm create "sysvms/$VM" >/dev/null
+        [ "$VERBOSE" != no ] && log_end_msg $?
+        RET=0
+    else
+        RET=1
+    fi
+    
+    # Regardless of whether we could get the lock or not, the
+    # lvchange -a n probably disabled the LV somewhere; be sure we
+    # clean up
+    lvchange -a y "$DISK" >/dev/null 2>&1
+    
+    return $RET
+}
+
 do_startup() {
     gen_files
     
+    for vm in "${SYSVMS[@]}"; do
+        start_sysvm "$vm"
+    done
+    
     echo 1 >/proc/sys/net/ipv4/ip_forward
     for i in all default; do
         echo 1 >/proc/sys/net/ipv4/conf/$i/rp_filter
-- 
1.7.9.5