ubuntu-cpc: Refactor for consistency & fix grub-install logic

[ Steve Langasek ]
  * Refactor/reorder ubuntu-cpc support for consistency with other flavors,
    so that subarch overrides can be applied correctly.
  [ Ben Howard ]
  * ubuntu-cpc:
    - fixed loop setup due to change of kpartx output
    - only use grub-install logic for Intel architectures

debian/changelog

@@ -1,3 +1,16 @@
+livecd-rootfs (2.209.10) trusty; urgency=medium
+
+  [ Steve Langasek ]
+  * Refactor/reorder ubuntu-cpc support for consistency with other flavors,
+    so that subarch overrides can be applied correctly.
+
+  [ Ben Howard ]
+  * ubuntu-cpc:
+    - fixed loop setup due to change of kpartx output
+    - only use grub-install logic for Intel architectures
+
+ -- Robert C Jennings <robert.jennings@canonical.com>  Tue, 23 May 2017 21:01:47 -0500
+
 livecd-rootfs (2.209.9) trusty; urgency=medium
 
   [Daniel Watkins]

live-build/auto/config

@@ -388,6 +388,31 @@ case $PROJECT in
 		;;
 
 	ubuntu-cpc)
+		add_task install minimal standard cloud-image
+		add_package install ubuntu-minimal
+
+		BINARY_REMOVE_LINUX=false
+		OPTS="${OPTS:+$OPTS }--initramfs=none"
+		KERNEL_FLAVOURS=virtual
+		case $ARCH in
+			armhf)
+				KERNEL_FLAVOURS=generic-lpae
+				add_package install flash-kernel
+				add_task install server
+				;;
+			arm64)
+				KERNEL_FLAVOURS=generic
+				add_package install flash-kernel
+				add_task install server
+				;;
+			ppc64el)
+				add_task install server
+				;;
+		esac
+		OPTS="${OPTS:+$OPTS }--system=normal"
+		OPTS="${OPTS:+$OPTS }--hdd-label=cloudimg-rootfs"
+		OPTS="${OPTS:+$OPTS }--ext-resize-blocks=536870912 --ext-block-size=4096"
+		OPTS="${OPTS:+$OPTS }--ext-fudge-factor=15"
 		;;
 
 	*)
@@ -467,33 +492,6 @@ case $PROJECT in
 		;;
 esac
 
-if [ "$PROJECT" = "ubuntu-cpc" ]; then
-	BINARY_REMOVE_LINUX=false
-	OPTS="${OPTS:+$OPTS }--initramfs=none"
-	KERNEL_FLAVOURS=virtual
-	case $ARCH in
-		armhf)
-			KERNEL_FLAVOURS=generic-lpae
-			add_package install flash-kernel
-			add_task install server
-			;;
-		arm64)
-			KERNEL_FLAVOURS=generic
-			add_package install flash-kernel
-			add_task install server
-			;;
-		ppc64el)
-			add_task install server
-			;;
-	esac
-	OPTS="${OPTS:+$OPTS }--system=normal"
-	OPTS="${OPTS:+$OPTS }--hdd-label=cloudimg-rootfs"
-	OPTS="${OPTS:+$OPTS }--ext-resize-blocks=536870912 --ext-block-size=4096"
-	OPTS="${OPTS:+$OPTS }--ext-fudge-factor=15"
-	add_task install minimal standard cloud-image
-	add_package install landscape-client ubuntu-minimal
-fi
-
 add_chroot_hook update-apt-file-cache
 add_chroot_hook update-apt-xapian-index
 add_chroot_hook update-mlocate-database

live-build/ubuntu-cpc/functions

@@ -11,15 +11,16 @@ backing_img=
 apt-get -qqy install dosfstools gdisk
 
 clean_loops() {
+
+    if [ -n "${backing_img}" ]; then
+        kpartx -v -d "${backing_img}"
+        unset backing_img
+    fi
+
     if [ -z "${rootfs_dev_mapper}" ]; then
         return 0
     fi
 
-    if [ -n "${backing_img}" ]; then
-        kpartx -v -d "${backing_img}"
-    fi
-
-    unset backing_img
     unset loop_device
     unset loop_raw
     unset rootfs_dev_mapper
@@ -40,11 +41,27 @@ mount_image() {
     apt-get install -qqy kpartx
     trap clean_loops EXIT
     backing_img="$1"
-    loop_raw="$(kpartx -s -v -a "$1" )"
+    kpartx_mapping="$(kpartx -s -v -a ${backing_img})"
-    loop_device="$(echo -e "${loop_raw}" | head -n1 | awk '{print($(NF-1))}')"
+
-    rootfs_dev_mapper="/dev/mapper${loop_device///dev/}p1"
+    # Find the loop device
-    [ ! -b "${rootfs_dev_mapper}" ] &&
+    loop_p1="$(echo -e ${kpartx_mapping} | head -n1 | awk '{print$3}')"
-        echo "${rootfs_dev_mapper} is not a block device" && exit 1
+    loop_device="/dev/loop$(echo ${loop_p1} | cut -b5)"
+    if [ ! -b ${loop_device} ]; then
+        echo "unable to find loop device for ${backing_img}"
+        exit 1
+    fi
+
+    # Find the rootfs location
+    rootfs_dev_mapper="/dev/mapper/${loop_p1}"
+    if [ ! -b "${rootfs_dev_mapper}" ]; then
+        echo "${rootfs_dev_mapper} is not a block device";
+        exit 1
+    fi
+
+    # Add some information to the debug logs
+    echo "Mounted disk image ${backing_img} to ${rootfs_dev_mapper}"
+    blkid ${rootfs_dev_mapper}
+
     return 0
 }
 

live-build/ubuntu-cpc/hooks/032-disk-image.binary

@@ -32,24 +32,23 @@ cp -a chroot/* mountpoint/
 umount mountpoint
 rmdir mountpoint
 
-should_install_grub() {
+case $architecture in
-    case $architecture in
+    amd64|i386) should_install_grub=1;;
-        armhf|arm64)
+             *) should_install_grub=0;;
-            return 1
+esac
-            ;;
-        *)
-            return 0
-            ;;
-    esac
-}
 
-if should_install_grub; then
+if [ "${should_install_grub}" -eq 1 ]; then
     mkdir mountpoint
     mount_partition "${rootfs_dev_mapper}" mountpoint
 
     echo "(hd0) ${loop_device}" > mountpoint/tmp/device.map
     chroot mountpoint grub-install ${loop_device}
-    chroot mountpoint grub-bios-setup --boot-image=i386-pc/boot.img --core-image=i386-pc/core.img --skip-fs-probe --device-map=/tmp/device.map ${loop_device}
+    chroot mountpoint grub-bios-setup \
+        --boot-image=i386-pc/boot.img \
+        --core-image=i386-pc/core.img \
+        --skip-fs-probe \
+        --device-map=/tmp/device.map \
+        ${loop_device}
 
     rm mountpoint/tmp/device.map
     umount_partition mountpoint