scripts/ext-tools: introduce new script to install prebuilt tools

Add a simple script to make it easier to install a prebuilt tools tar.
Currently it will be used by our tools container and kernel workflow on
github.

Simple script that take a tar that contains prebuilt host tools, extract
them and refresh the timestamps to skip recompilation of such host
tools.

By default it refresh timestamps of build_dir/host and
staging_dir/host/stamp.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

diff --git a/scripts/ext-tools.sh b/scripts/ext-tools.sh
new file mode 100755 (executable)
index 0000000..bf56f4d
--- /dev/null
+++ b/scripts/ext-tools.sh
@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+
+TOOLS_TAR=""
+HOST_BUILD_DIR=$(pwd)/"build_dir/host"
+HOST_STAGING_DIR_STAMP=$(pwd)/"staging_dir/host/stamp"
+
+refresh_timestamps() {
+       find "$1" -not -type l -print0 | xargs -0 touch
+}
+
+extract_prebuilt_tar() {
+       tar -xf "$1"
+}
+
+install_prebuilt_tools() {
+       extract_prebuilt_tar "$TOOLS_TAR"
+
+       if [ ! -d "$HOST_BUILD_DIR" ]; then
+               echo "Can't find Host Build Dir "$HOST_BUILD_DIR"" >&2
+               exit 1
+       fi
+
+       refresh_timestamps "$HOST_BUILD_DIR"
+       sleep 1
+
+       if [ ! -d "$HOST_STAGING_DIR_STAMP" ]; then
+               echo "Can't find Host Staging Dir Stamp "$HOST_STAGING_DIR_STAMP"" >&2
+               exit 1
+       fi
+
+       refresh_timestamps "$HOST_STAGING_DIR_STAMP"
+
+       return 0
+}
+
+while [ -n "$1" ]; do
+       arg="$1"; shift
+       case "$arg" in
+               --host-build-dir)
+                       [ -d "$1" ] || {
+                               echo "Directory '$1' does not exist." >&2
+                               exit 1
+                       }
+                       HOST_BUILD_DIR="$(cd "$1"; pwd)"; shift
+               ;;
+
+               --host-staging-dir-stamp)
+                       [ -d "$1" ] || {
+                               echo "Directory '$1' does not exist." >&2
+                               exit 1
+                       }
+                       HOST_STAGING_DIR_STAMP="$(cd "$1"; pwd)"; shift
+               ;;
+
+               --tools)
+                       [ -f "$1" ] || {
+                               echo "Tools tar file '$1' does not exist." >&2
+                               exit 1
+                       }
+                       TOOLS_TAR="$1"; shift
+                       install_prebuilt_tools
+
+                       exit $?
+               ;;
+
+               -h|--help)
+                       me="$(basename "$0")"
+                       echo -e "\nUsage:\n"                                            >&2
+                       echo -e "  $me --host-build-dir {directory}"                    >&2
+                       echo -e "    Set to refresh timestamp of this build directory"  >&2
+                       echo -e "    with --tools."                                     >&2
+                       echo -e "    THIS OPTION MUST BE SET BEFORE --tools."           >&2
+                       echo -e "    If not provided the default directory is:"         >&2
+                       echo -e "    $(pwd)/build_dir/host\n"                           >&2
+                       echo -e "  $me --host-staging-dir-stamp {directory}"            >&2
+                       echo -e "    Set to refresh staging timestamp present in this"  >&2
+                       echo -e "    directory with --tools."                           >&2
+                       echo -e "    THIS OPTION MUST BE SET BEFORE --tools."           >&2
+                       echo -e "    If not provided the default directory is:"         >&2
+                       echo -e "    $(pwd)/staging_dir/host/stamp\n"                   >&2
+                       echo -e "  $me --tools {tar}"                                   >&2
+                       echo -e "    Install the prebuilt tools present in the passed"  >&2
+                       echo -e "    tar and prepare them."                             >&2
+                       echo -e "    To correctly use them it's needed to update the."  >&2
+                       echo -e "    timestamp of each tools to skip recompilation.\n"  >&2
+                       echo -e "  $me --help"                                          >&2
+                       echo -e "    Display this help text and exit.\n\n"              >&2
+                       exit 1
+               ;;
+
+               *)
+                       echo "Unknown argument '$arg'" >&2
+                       exec $0 --help
+               ;;
+       esac
+done
+
+exec $0 --help