simplify some shell code

[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..430ae9e
--- 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 +9,78 @@
 # Description:       
 ### END INIT INFO
 
-set -e
+PACKAGE=invirt-xen-config
+NAME="$PACKAGE"
+DESC="Invirt Xen host"
+PARENTPACKAGE=xend
+SYSVMS=(s_master s_remote s_console)
+GEN_FILES=(/etc/xen/xend-config.sxp.invirt "${SYSVMS[@]/#//etc/xen/sysvms/}")
 
-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="$1"
+    DISK="/dev/xenvg/${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 "$DISK" >/dev/null 2>&1; then
+        # If we can disable and then re-enable the VMs disk, then the
+        # VM can't be running. If the lvchange -a ey succeeds, then we
+        # have an exclusive lock across the cluster on enabling the
+        # disk, which avoids the potential race condition of two hosts
+        # starting a VM at the same time
+        [ "$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 "$vm"
+    done
+    
     echo 1 >/proc/sys/net/ipv4/ip_forward
-    for foo in all default; do
-    echo 1 >/proc/sys/net/ipv4/conf/$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"