Support installing packages by default

Adds new disk-image-create --install-type option which
can be used to enable alternate install types. The
default install type is 'source'.

The motivation is to eliminate elements like
enable-package-installs which require coupling and also
don't work with elements in multiple element repositories.

This patch does not prevent you from using the previous
DIB_INSTALLTYPE_ variables to customize the install type,
rather it just changes the default so you don't have to
set it so often when using things like packages.

Change-Id: Icee98440fc2251728f2dca30e7c4789a0fd89b93

README.md

@@ -124,7 +124,14 @@ Install Types
 -------------
 
 Install types permit elements to be installed from different sources, such as
-git repositories, distribution packages, or pip.
+git repositories, distribution packages, or pip. The default install type
+is 'source' but it can be modified on the disk-image-create command line
+via the --install-type option. For example you can set:
+
+    --install-type=package
+
+to enable package installs by default. Alternately, you can also
+set DIB\_DEFAULT\_INSTALLTYPE.
 
 Many elements expose different install types. The different implementations
 live under `<install-dir-prefix>-<install-type>-install` directories under an

bin/disk-image-create

@@ -65,6 +65,7 @@ function show_options () {
     echo "       Options need to be comma separated, and follow the key=value pattern."
     echo "    --root-label label -- label for the root filesystem.  Defaults to 'cloudimg-rootfs'."
     echo "    --ramdisk-element -- specify the main element to be used for building ramdisks."
+    echo "    --install-type -- specify the default installation type. Defaults to 'source'. Set to 'package' to use package based installations by default."
     if [ "$IS_RAMDISK" == "0" ]; then
         echo "    -n skip the default inclusion of the 'base' element"
         echo "    -p package[,package,package] -- list of packages to install in the image"
@@ -90,7 +91,8 @@ INSTALL_PACKAGES=""
 IMAGE_TYPES=("qcow2")
 COMPRESS_IMAGE="true"
 export DIB_ROOT_LABEL=""
-TEMP=`getopt -o a:ho:t:xucnp: -l no-tmpfs,offline,help,min-tmpfs:,image-size:,image-cache:,max-online-resize:,qemu-img-options:,ramdisk-element:,root-label: -n $SCRIPTNAME -- "$@"`
+DIB_DEFAULT_INSTALLTYPE=${DIB_DEFAULT_INSTALLTYPE:-"source"}
+TEMP=`getopt -o a:ho:t:xucnp: -l no-tmpfs,offline,help,min-tmpfs:,image-size:,image-cache:,max-online-resize:,qemu-img-options:,ramdisk-element:,root-label:,install-type: -n $SCRIPTNAME -- "$@"`
 if [ $? -ne 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
 
 # Note the quotes around `$TEMP': they are essential!
@@ -116,6 +118,7 @@ while true ; do
         --qemu-img-options) QEMU_IMG_OPTIONS=$2; shift 2;;
         --root-label) export DIB_ROOT_LABEL=$2; shift 2;;
         --ramdisk-element) RAMDISK_ELEMENT=$2; shift 2;;
+        --install-type) DIB_DEFAULT_INSTALLTYPE=$2; shift 2;;
         --) shift ; break ;;
         *) echo "Internal error!" ; exit 1 ;;
     esac
@@ -162,6 +165,8 @@ fi
 
 mk_build_dir
 create_base
+# This variable needs to be propagated into the chroot
+echo "export DIB_DEFAULT_INSTALLTYPE=\"${DIB_DEFAULT_INSTALLTYPE}\"" > $TMP_HOOKS_PATH/environment.d/11-dib-install-type.bash
 run_d extra-data
 # Run pre-install scripts. These do things that prepare the chroot for package installs
 run_d_in_target pre-install

elements/base/extra-data.d/99-enable-install-types

@@ -45,14 +45,14 @@ for _install_type_var in $INSTALL_TYPE_VARS; do
 
 done
 
-# For any existing *-source-install directory under install.d, if an
-# environment variable setting a different install type was not seen, enable
-# the source install type.
-source_install_dirs=$(ls -d $TMP_HOOKS_PATH/install.d/*-source-install || true)
-for _source_install_dir in $source_install_dirs; do
-    SUFFIX="-source-install"
-    _source_install_dir=$(basename $_source_install_dir)
-    INSTALLDIRPREFIX=${_source_install_dir%$SUFFIX}
+# For any existing *-<default_install_dir>-install directory under install.d,
+# if an environment variable setting a different install type was not seen,
+# enable the default (set via --install-type).
+default_install_type_dirs=$(ls -d $TMP_HOOKS_PATH/install.d/*-${DIB_DEFAULT_INSTALLTYPE}-install || true)
+for _install_dir in $default_install_type_dirs; do
+    SUFFIX="-${DIB_DEFAULT_INSTALLTYPE}-install"
+    _install_dir=$(basename $_install_dir)
+    INSTALLDIRPREFIX=${_install_dir%$SUFFIX}
 
     found=0
     for specified in ${SPECIFIED_ELEMS[@]}; do
@@ -65,7 +65,7 @@ for _source_install_dir in $source_install_dirs; do
     # install type not specified, assume source
     if [ "$found" = "0" ]; then
         pushd $TMP_HOOKS_PATH/install.d
-        ln -sf $_source_install_dir/* .
+        ln -sf $_install_dir/* .
         popd
     fi
 done

elements/source-repositories/extra-data.d/98-source-repositories

@@ -89,7 +89,7 @@ function get_repos_for_element(){
 
             # Return if install type is not source
             local INSTALL_TYPE_VAR=DIB_INSTALLTYPE_${REPONAME//[^A-Za-z0-9]/_}
-            local INSTALL_TYPE=${!INSTALL_TYPE_VAR:-source}
+            local INSTALL_TYPE=${!INSTALL_TYPE_VAR:-$DIB_DEFAULT_INSTALLTYPE}
             if [ ! $INSTALL_TYPE = "source" ]; then
                 echo "$REPONAME install type not set to source"
                 continue