genericize sysvm startup to glob /etc/xen/sysvms/s_*

[invirt/packages/invirt-xen-config.git] / debian / invirt-xen-config.init

diff --git a/debian/invirt-xen-config.init b/debian/invirt-xen-config.init
old mode 100644 (file)
new mode 100755 (executable)
index 857497d..0613ff9
--- a/debian/invirt-xen-config.init
+++ b/debian/invirt-xen-config.init
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 ### BEGIN INIT INFO
 # Provides:          invirt-xen-config
 # Required-Start:    $local_fs $remote_fs
@@ -9,14 +9,88 @@
 # Description:       
 ### END INIT INFO
 
-set -e
+PACKAGE=invirt-xen-config
+NAME="$PACKAGE"
+DESC="Invirt Xen host"
+PARENTPACKAGE=xend
+SYSVM_FILES=(/etc/xen/sysvms/s_*)
+SYSVMS=("${SYSVM_FILES[@]/#\/etc\/xen\/sysvms\/}")
+GEN_FILES=(/etc/xen/xend-config.sxp.invirt)
 
-case $1 in
-    start)
+dpkg -s "$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="$1"
+    LV="${VM}_hda"
+    DISK="/dev/xenvg/$LV"
+    
+    # Don't bother trying to start the VM if it's already running
+    if xm list "$VM" >/dev/null 2>&1; then
+        return 1
+    fi
+    
+    RET=1
+    # To keep multiple hosts from trying to start a VM at the same
+    # time, lock VM creation at startup-time with a lock LV, since LV
+    # creation is atomic
+    if lvcreate -L 1K -n "lock_${LV}" xenvg >/dev/null 2>&1; then
+        # If we can disable the LV, then the VM isn't already running
+        # somewhere else
+        if lvchange -a n "$DISK" >/dev/null 2>&1; then
+            lvchange -a y "$DISK" >/dev/null 2>&1
+            
+            [ "$VERBOSE" != no ] && log_daemon_msg "Starting sysvm $VM"
+            xm create "sysvms/$VM" >/dev/null
+            [ "$VERBOSE" != no ] && log_end_msg $?
+            RET=0
+        fi
+        
+        # Regardless of whether we could get the lock or not, the
+        # lvchange -a n probably disabled the LV somewhere; be sure we
+        # clean up
+        lvchange -a y "$DISK" >/dev/null 2>&1
+    
+        # Cleanup the lock, regardless of whether we started the LV
+        lvchange -a n "/dev/xenvg/lock_${LV}" >/dev/null 2>&1
+        lvchange -a ey "/dev/xenvg/lock_${LV}" >/dev/null 2>&1
+        lvremove -f "/dev/xenvg/lock_${LV}" >/dev/null 2>&1
+    fi
+    
+    return $RET
+}
+
+do_startup() {
+    gen_files
+    
+    for vm in "${SYSVMS[@]}"; do
+        start_sysvm "$vm"
+    done
+    
     echo 1 >/proc/sys/net/ipv4/ip_forward
-    for foo in all default; do
-    echo 1 >/proc/sys/net/ipv4/conf/$foo/rp_filter 
-    echo 1 >/proc/sys/net/ipv4/conf/$foo/proxy_arp
+    for i in all default; do
+        echo 1 >/proc/sys/net/ipv4/conf/$i/rp_filter
+        echo 1 >/proc/sys/net/ipv4/conf/$i/proxy_arp
     done
-    ;;
-    esac
+    
+    invoke-rc.d "$PARENTPACKAGE" "$1"
+}
+
+do_start() {
+    do_startup "start"
+}
+
+do_reload() {
+    do_startup "reload"
+}
+
+do_stop() {
+    invoke-rc.d "$PARENTPACKAGE" stop
+}
+
+std_init "$1"