Install conntrack and create image/kernel dir in Dom0

We are moving files from devstack/tools/xen/ to os-xenapi repo,
but I found devstack/lib/nova_plugins/hypervisor-xenserver file
will use some functions in tools/xen/functions, e.g.
- create_directory_for_images
- create_directory_for_kernels
- install_conntrack_tools
Once we remove all files under tools/xen to os-xenapi, devstack
will fail to deploy nova-compute service as it cannot find files
in tools/xen anymore. Thus, I made this patch to let our devstack
plugin to trigger the above functions. So we can safely remove
the whole folder tools/xen and some functions in devstack repo

Change-Id: I712ee74ce945859ba5118e09b7d9436ca2686cb7

devstack/dom0_functions

@@ -9,3 +9,68 @@ function dom0_plugin_location {
     done
     return 1
 }
+
+function get_default_sr {
+    xe pool-list params=default-SR minimal=true
+}
+
+function get_local_sr_path {
+    pbd_device_config_path=`xe pbd-list sr-uuid=$(get_default_sr) params=device-config | grep " path: "`
+    if [ -n "$pbd_device_config_path" ]; then
+        pbd_uuid=`xe pbd-list sr-uuid=$(get_default_sr) minimal=true`
+        pbd_path=`xe pbd-param-get uuid=$pbd_uuid param-name=device-config param-key=path || echo ""`
+    else
+        pbd_path="/var/run/sr-mount/$(get_default_sr)"
+    fi
+
+    if [ -d "$pbd_path" ]; then
+        echo $pbd_path
+        return 0
+    else
+        return 1
+    fi
+}
+
+function create_directory_for_images {
+    if [ -d "/images" ]; then
+        echo "INFO: /images directory already exists, using that" >&2
+    else
+        local local_path
+        local_path="$(get_local_sr_path)/os-images"
+        mkdir -p $local_path
+        ln -s $local_path /images
+    fi
+}
+
+function create_directory_for_kernels {
+    if [ -d "/boot/guest" ]; then
+        echo "INFO: /boot/guest directory already exists, using that" >&2
+    else
+        local local_path
+        local_path="$(get_local_sr_path)/os-guest-kernels"
+        mkdir -p $local_path
+        ln -s $local_path /boot/guest
+    fi
+}
+
+function install_conntrack_tools {
+    local xs_host
+    local xs_ver_major
+    local centos_ver
+    local conntrack_conf
+    xs_host=$(xe host-list --minimal)
+    xs_ver_major=$(xe host-param-get uuid=$xs_host param-name=software-version param-key=product_version_text_short | cut -d'.' -f 1)
+    if [ $xs_ver_major -gt 6 ]; then
+        # Only support conntrack-tools in Dom0 with XS7.0 and above
+        if [ ! -f /usr/sbin/conntrackd ]; then
+            sed -i s/#baseurl=/baseurl=/g /etc/yum.repos.d/CentOS-Base.repo
+            centos_ver=$(yum version nogroups |grep Installed | cut -d' ' -f 2 | cut -d'/' -f 1 | cut -d'-' -f 1)
+            yum install -y --enablerepo=base --releasever=$centos_ver conntrack-tools
+            # Backup conntrackd.conf after install conntrack-tools, use the one with statistic mode
+            mv /etc/conntrackd/conntrackd.conf /etc/conntrackd/conntrackd.conf.back
+            conntrack_conf=$(find /usr/share/doc -name conntrackd.conf |grep stats)
+            cp $conntrack_conf /etc/conntrackd/conntrackd.conf
+        fi
+        service conntrackd restart
+    fi
+}

devstack/plugin.sh

@@ -245,6 +245,29 @@ function cleanup_dom0_iptables {
     $_ERREXIT_XENSERVER
 }
 
+# Prepare directories for kernels and images in Dom0
+function create_dom0_kernel_and_image_dir {
+    local ssh_dom0=$(get_dom0_ssh)
+
+    {
+        echo "set -eux"
+        cat $OS_XENAPI_DIR/devstack/dom0_functions
+        echo "create_directory_for_images"
+        echo "create_directory_for_kernels"
+    } | $ssh_dom0
+}
+
+# Install conntrack-tools in Dom0
+function install_dom0_conntrack {
+    local ssh_dom0=$(get_dom0_ssh)
+
+    {
+        echo "set -eux"
+        cat $OS_XENAPI_DIR/devstack/dom0_functions
+        echo "install_conntrack_tools"
+    } | $ssh_dom0
+}
+
 if [[ "$MODE" == "stack" ]]; then
     case "$PHASE" in
         pre-install)
@@ -254,6 +277,8 @@ if [[ "$MODE" == "stack" ]]; then
             # Called after the layer 1 and 2 projects source and their dependencies have been installed
             install_dom0_plugins
             config_dom0_iptables
+            install_dom0_conntrack
+            create_dom0_kernel_and_image_dir
             # set image variables
             DEFAULT_IMAGE_NAME="cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-disk"
             DEFAULT_IMAGE_FILE_NAME="cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-disk.vhd.tgz"