Add support for CentOS

This change aims to add the foundations for CentOS support
on manila-image-elements.

In this patch-set, the following has been modified

- Added elements for manila-centos-minimal
- Added elements for centos-nfs
- Added elements for centos-cifs
- Renamed all elements for the different protocols to distro-protocol
to facilitate automation
- Modified the main script to take the distro param

Follow-up patches will add centos-based elements
for all other protocols supported.

Change-Id: Ie1469a8b3973b9a15c3fa27688df3b7e7e8da688
Partial-Bug: #1675538

bin/manila-image-create

@@ -25,6 +25,7 @@ MANILA_IMG_NAME=${MANILA_IMG_NAME:-"manila-service-image"}
 
 # Manila image creation default
 MANILA_SHARE_PROTO=${MANILA_SHARE_PROTO:-"default"}
+MANILA_DISTRO=${MANILA_DISTRO:-"ubuntu"}
 
 # Path to elements
 SCRIPT_HOME="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
@@ -54,10 +55,12 @@ err() {
 }
 
 print_usage() {
-    echo "Usage: ${0##*/} [-s share-proto] [-h]"
+    echo "Usage: ${0##*/} [-s share-proto] [-d distro] [-h]"
     echo "Options:"
     echo " -s | --share-proto: name of the share protocol. \
          Possible options are nfs, nfs-ganesha, cifs or zfs"
+    echo " -d | --distro: name of the Linux distro. \
+         Possible options are ubuntu or centos"
     echo " -h | --help: print this usage message and exit"
     echo ""
     echo "Usage example: manila_image_elements -s nfs"
@@ -71,6 +74,13 @@ valid_share_protocol(){
     fi
 }
 
+valid_distro() {
+    if ["${MANILA_DISTRO}" != "ubuntu" ] && [ "${MANILA_DISTRO}" != "centos" ]; then
+        err "Distro ${MANILA_DISTRO} not supported. Valid options are ubuntu or centos."
+        exit 1
+    fi
+}
+
 parse_arguments() {
     while [[ $# > 0 ]]; do
         case "$1" in
@@ -79,6 +89,12 @@ parse_arguments() {
                 valid_share_protocol
                 shift 2
             ;;
+            -d|--distro)
+                export MANILA_DISTRO=$2
+                export MANILA_IMG_OS=manila-$2-minimal
+                valid_distro
+                shift 2
+            ;;
             -h|--help)
                 print_usage
                 exit 0
@@ -93,27 +109,24 @@ parse_arguments() {
 
 # Verify configuration
 # --------------------
+configure() {
     REQUIRED_ELEMENTS="manila-ssh vm $MANILA_IMG_OS dhcp-all-interfaces"
     IMAGE_FORMAT="qcow2"
     OPTIONAL_ELEMENTS=
     OPTIONAL_DIB_ARGS=
 
-configure() {
-    OPTIONAL_ELEMENTS=
-    OPTIONAL_DIB_ARGS=
-
     if [ "$MANILA_SHARE_PROTO" = "default" ]; then
         # NOTE(vkmc) Generic driver uses 2 protocols by default
         # NFS and CIFS. This is required by the gate.
-        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS manila-nfs manila-cifs"
+        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS ${MANILA_DISTRO}-nfs ${MANILA_DISTRO}-cifs"
     elif [ "$MANILA_SHARE_PROTO" = "nfs" ]; then
-        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS manila-nfs"
+        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS ${MANILA_DISTRO}-nfs"
     elif [ "$MANILA_SHARE_PROTO" = "nfs-ganesha" ]; then
-        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS manila-nfs-ganesha"
+        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS ${MANILA_DISTRO}-nfs-ganesha"
     elif [ "$MANILA_SHARE_PROTO" = "cifs" ]; then
-        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS manila-cifs"
+        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS ${MANILA_DISTRO}-cifs"
     elif [ "$MANILA_SHARE_PROTO" = "zfs" ]; then
-        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS manila-zfs"
+        OPTIONAL_ELEMENTS="$OPTIONAL_ELEMENTS ${MANILA_DISTRO}-zfs"
     fi
 
     if [ "$USE_OFFLINE_MODE" = "yes" ]; then

elements/centos-cifs/install.d/50-manila-cifs

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+set -eu
+
+yum -y samba cifs-utils

elements/centos-cifs/post-install.d/50-manila-smb-enable

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# Enable and start Samba server
+systemctl enable smb.service
+systemctl start smb.service

elements/centos-nfs/install.d/50-manila-nfs

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# Install required packages
+yum -y install nfs-utils

elements/centos-nfs/post-install.d/50-manila-nfs-enable

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# Enable and start NFS server
+systemctl enable nfs-server.service
+systemctl start nfs-server.service

elements/manila-centos-minimal/README.rst

@@ -0,0 +1,5 @@
+=====================
+manila-centos-minimal
+=====================
+
+Create a minimal image based on CentOS.

elements/manila-centos-minimal/element-deps

@@ -0,0 +1 @@
+centos-minimal

elements/manila-centos-minimal/element-provides

@@ -0,0 +1 @@
+operating-system

elements/manila-centos-minimal/package-installs.yaml

@@ -0,0 +1,8 @@
+openssh-server:
+sudo:
+rpcbind:
+vim:
+iptables:
+iputils:
+net-tools:
+python:

elements/manila-centos-minimal/post-install.d/50-manila-user

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# Set 'bash' as default shell for 'manila' user.
+useradd -m manila -s /bin/bash
+passwd manila

elements/manila-centos-minimal/pre-install.d/00-centos-yum-update

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+yum -y update

elements/manila-centos-minimal/pre-install.d/01-set-centos-mirror

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+DIB_DISTRIBUTION_MIRROR=${DIB_DISTRIBUTION_MIRROR:-}
+
+[ -n "$DIB_DISTRIBUTION_MIRROR" ] || exit 0
+
+# Only set the mirror for the Base, Extras and Updates repositories
+# The others arn't enabled and do not exist on all mirrors
+sed -e "s|^#baseurl=http://mirror.centos.org/centos|baseurl=$DIB_DISTRIBUTION_MIRROR|;/^mirrorlist=/d" -i /etc/yum.repos.d/CentOS-Base.repo

elements/ubuntu-cifs/post-install.d/50-manila-samba-patch-config

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# Enable registry in samba config
+sed -i "s/\[global\]/\[global\]\\n\\n   include = registry\\n/g" /etc/samba/smb.conf