Various image build improvements for ARM

Add an --arch option to build_image.sh, passed to install_packages.sh.
Use it to set APT::Architecture.

Add --mirror2/--suite2 options to build_image.sh, and --server2/--suite2
options to install_packages.sh (differing option names to match options
that were there already).  This allows some of the packages to be pulled
from ports.ubuntu.com rather than from local_packages, like this:

  ./build_image.sh --arch armel --mirror2 http://ports.ubuntu.com/ubuntu-ports --suite2 karmic

Copy only .debs from local_packages, not whatever other junk might be
lying around there.

Use copy: rather than file: for local_packages, so that the files will
be copied into the apt cache directory for the benefit of
dpkg_no_scripts.sh.

Review URL: http://codereview.chromium.org/554031

build_image.sh

@@ -33,8 +33,12 @@ DEFINE_boolean replace $FLAGS_FALSE "Overwrite existing output, if any."
 DEFINE_boolean increment $FLAGS_FALSE \
   "Picks the latest build and increments the minor version by one."
 
+DEFINE_string arch "x86" \
+  "The target architecture to build for. One of { x86, armel }."
 DEFINE_string mirror "$DEFAULT_IMG_MIRROR" "Repository mirror to use."
 DEFINE_string suite "$DEFAULT_IMG_SUITE" "Repository suite to base image on."
+DEFINE_string mirror2 "" "Additional repository mirror to use (URL only)."
+DEFINE_string suite2 "" "Repository suite for additional mirror."
 DEFINE_string pkglist "$DEFAULT_PKGLIST" \
   "Name of file listing packages to install from repository."
 DEFINE_boolean with_dev_pkgs $FLAGS_TRUE \
@@ -128,8 +132,11 @@ fi
   --root="$ROOT_FS_DIR"               \
   --output_dir="${OUTPUT_DIR}"        \
   --package_list="$PKGLIST"           \
+  --arch="$FLAGS_arch"                \
   --mirror="$FLAGS_mirror"            \
-  --suite="$FLAGS_suite"
+  --suite="$FLAGS_suite"              \
+  --mirror2="$FLAGS_mirror2"          \
+  --suite2="$FLAGS_suite2"
 
 "${SCRIPTS_DIR}/customize_rootfs.sh" --root="${ROOT_FS_DIR}"
 

install_packages.sh

@@ -34,6 +34,8 @@ DEFINE_string mirror "$DEFAULT_IMG_MIRROR" \
   "The upstream package mirror to use."
 DEFINE_string suite "$DEFAULT_IMG_SUITE" \
   "The upstream package suite to use."
+DEFINE_string mirror2 "" "Additional package mirror to use (URL only)."
+DEFINE_string suite2 "" "Package suite for additional mirror."
 
 # Parse command line
 FLAGS "$@" || exit 1
@@ -81,7 +83,7 @@ cleanup_rootfs_mounts() {
 
 # Set up repository for locally built packages; these take highest precedence.
 mkdir -p "${SETUP_DIR}/local_packages"
-cp "${FLAGS_build_root}/${FLAGS_arch}/local_packages"/* \
+cp "${FLAGS_build_root}/${FLAGS_arch}/local_packages"/*.deb \
   "${SETUP_DIR}/local_packages"
 cd "$SETUP_DIR"
 dpkg-scanpackages local_packages/ /dev/null | \
@@ -91,15 +93,26 @@ cd -
 # Create the temporary apt source.list used to install packages.
 APT_SOURCE="${OUTPUT_DIR}/sources.list"
 cat <<EOF > "$APT_SOURCE"
-deb file:"$SETUP_DIR" local_packages/
+deb copy:"$SETUP_DIR" local_packages/
 deb $FLAGS_mirror $FLAGS_suite main restricted multiverse universe
 EOF
+if [ -n "$FLAGS_mirror2" ] && [ -n "$FLAGS_suite2" ]; then
+  cat <<EOF >> "$APT_SOURCE"
+deb $FLAGS_mirror2 $FLAGS_suite2 main restricted multiverse universe
+EOF
+fi
 
 # Cache directory for APT to use. This cache is re-used across builds. We
 # rely on the cache to reduce traffic to the hosted repositories.
 APT_CACHE_DIR="${FLAGS_build_root}/apt_cache-${FLAGS_arch}/"
 mkdir -p "${APT_CACHE_DIR}/archives/partial"
 
+if [ "${FLAGS_arch}" = x86 ]; then
+  APT_ARCH=i386
+else
+  APT_ARCH="${FLAGS_arch}"
+fi
+
 # Create the apt configuration file. See "man apt.conf"
 APT_PARTS="${OUTPUT_DIR}/apt.conf.d"
 mkdir -p "$APT_PARTS"  # An empty apt.conf.d to avoid other configs.
@@ -114,6 +127,7 @@ APT
     Assume-Yes "1";
     AllowUnauthenticated "1";
   };
+  Architecture "${APT_ARCH}";
 };
 Dir
 {