Added GNU screen overlay bundle

src/.config

@@ -164,6 +164,7 @@ OVERLAY_TYPE=folder
 # nweb           - simple mini http server.
 # openjdk        - installs Open JDK. All operations are automated.
 # python         - Python3 scripting support (pip and packages optional).
+# screen         - GNU screen utility to interact with VT100 terminals
 # static_get     - portable binaries for Linux (http://s.minos.io).
 # stress         - CPU and RAM load generator.
 # util_linux     - executable utilities distributed by the Linux Kernel org.

src/minimal_overlay/bundles/screen/.config

@@ -0,0 +1,5 @@
+# You can find the latest screen source bundles here:
+#
+#   https://www.gnu.org/software/screen/
+#
+SCREEN_SOURCE_URL=https://ftp.gnu.org/gnu/screen/screen-4.8.0.tar.gz

src/minimal_overlay/bundles/screen/01_get.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+set -e
+
+. ../../common.sh
+
+# Read the common configuration properties.
+DOWNLOAD_URL=`read_property SCREEN_SOURCE_URL`
+USE_LOCAL_SOURCE=`read_property USE_LOCAL_SOURCE`
+
+# Grab everything after the last '/' character.
+ARCHIVE_FILE=${DOWNLOAD_URL##*/}
+
+if [ "$USE_LOCAL_SOURCE" = "true" -a ! -f $MAIN_SRC_DIR/source/overlay/$ARCHIVE_FILE  ] ; then
+  echo "Source bundle $MAIN_SRC_DIR/source/overlay/$ARCHIVE_FILE is missing and will be downloaded."
+  USE_LOCAL_SOURCE="false"
+fi
+
+cd $MAIN_SRC_DIR/source/overlay
+
+if [ ! "$USE_LOCAL_SOURCE" = "true" ] ; then
+  # Downloading screen source bundle file. The '-c' option allows the download to resume.
+  echo "Downloading screen source bundle from $DOWNLOAD_URL"
+  wget -c $DOWNLOAD_URL
+else
+  echo "Using local screen source bundle $MAIN_SRC_DIR/source/overlay/$ARCHIVE_FILE"
+fi
+
+# Delete folder with previously extracted screen.
+echo "Removing screen work area. This may take a while."
+rm -rf $WORK_DIR/overlay/$BUNDLE_NAME
+mkdir $WORK_DIR/overlay/$BUNDLE_NAME
+
+# Extract screen to folder 'work/overlay/screen'.
+# Full path will be something like 'work/overlay/screen/screen-4.8.0'.
+tar -xvf $ARCHIVE_FILE -C $WORK_DIR/overlay/$BUNDLE_NAME
+
+cd $SRC_DIR

src/minimal_overlay/bundles/screen/02_build.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+set -e
+
+. ../../common.sh
+
+cd $WORK_DIR/overlay/$BUNDLE_NAME
+
+# Change to the screen source directory which ls finds, e.g. 'screen-4.8.0'.
+cd $(ls -d screen-*)
+
+if [ -f Makefile ] ; then
+  echo "Preparing '$BUNDLE_NAME' work area. This may take a while."
+  make -j $NUM_JOBS clean
+else
+  echo "The clean phase for '$BUNDLE_NAME' has been skipped."
+fi
+
+rm -rf $DEST_DIR
+
+echo "Configuring '$BUNDLE_NAME'."
+CFLAGS="$CFLAGS" ./configure \
+  --prefix=/usr
+
+echo "Building '$BUNDLE_NAME'."
+make -j $NUM_JOBS
+
+echo "Installing '$BUNDLE_NAME'."
+make -j $NUM_JOBS install DESTDIR=$DEST_DIR
+
+echo "Reducing '$BUNDLE_NAME' size."
+set +e
+strip -g $DEST_DIR/usr/bin/*
+set -e
+
+# With '--remove-destination' all possibly existing soft links in
+# '$OVERLAY_ROOTFS' will be overwritten correctly.
+cp -r --remove-destination $DEST_DIR/* \
+  $OVERLAY_ROOTFS
+
+echo "Bundle '$BUNDLE_NAME' has been installed."
+
+cd $SRC_DIR

src/minimal_overlay/bundles/screen/bundle.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+. ../../common.sh
+
+./01_get.sh
+./02_build.sh
+
+cd $SRC_DIR