Add libevent bundle

src/.config

@@ -84,6 +84,12 @@ KBD_SOURCE_URL=https://www.kernel.org/pub/linux/utils/kbd/kbd-2.0.4.tar.gz
 #
 KEXEC_TOOLS_SOURCE_URL=http://kernel.org/pub/linux/utils/kernel/kexec/kexec-tools-2.0.15.tar.xz
 
+# You can find the latest libevent archives here:
+#
+#   https://github.com/libevent/libevent/releases/
+#
+LIBEVENT_SOURCE_URL=https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz
+
 # You can find the latest Links source bundles here:
 #
 #   http://links.twibright.com
@@ -223,6 +229,7 @@ COPY_SOURCE_ISO=true
 # felix      - Apache Felix OSGi framework.
 # java       - installs Oracle's JRE or JDK. Manual preparations are required.
 # kbd        - keyboard utilities
+# libevent   - event notification library.
 # links      - text browser for the web.
 # lua        - scripting language.
 # mll_utils  - set of executable utilities (mll-*).

src/README

@@ -57,6 +57,10 @@ Currently available overlay bundles:
 
                  loadkeys de
 
+* libevent   - event notification library API provides a mechanism to execute a
+               callback function when a specific event occurs on a file
+               descriptor or after a timeout has been reached.
+
 * Links      - Text based browser. Requires ~1MB additional space. Use the
                "links" command to activate the browser.
 

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

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+SRC_DIR=$(pwd)
+
+. ../../common.sh
+
+# Grab everything after the '=' character.
+DOWNLOAD_URL=$(grep -i LIBEVENT_SOURCE_URL $MAIN_SRC_DIR/.config | cut -f2 -d'=')
+
+# Grab everything after the last '/' character.
+ARCHIVE_FILE=${DOWNLOAD_URL##*/}
+
+# Read the 'USE_LOCAL_SOURCE' property from '.config'
+USE_LOCAL_SOURCE="$(grep -i USE_LOCAL_SOURCE $MAIN_SRC_DIR/.config | cut -f2 -d'=')"
+
+if [ "$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 libevent source bundle file. The '-c' option allows the download to resume.
+  echo "Downloading libevent source bundle from $DOWNLOAD_URL"
+  wget -c $DOWNLOAD_URL
+else
+  echo "Using local libevent source bundle $MAIN_SRC_DIR/source/overlay/$ARCHIVE_FILE"
+fi
+
+# Delete folder with previously extracted libevent.
+echo "Removing libevent work area. This may take a while..."
+rm -rf $WORK_DIR/overlay/libevent
+mkdir $WORK_DIR/overlay/libevent
+
+# Extract libevent to folder 'work/overlay/libevent'.
+# Full path will be something like 'work/overlay/libevent/libevent-2.1.8-stable'.
+tar -xvf $ARCHIVE_FILE -C $WORK_DIR/overlay/libevent
+
+cd $SRC_DIR
+

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

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+SRC_DIR=$(pwd)
+
+. ../../common.sh
+
+cd $WORK_DIR/overlay/libevent
+
+DESTDIR="$PWD/libevent_installed"
+
+# Change to the libevent source directory which ls finds, e.g. 'libevent-2.1.8-stable'.
+cd $(ls -d libevent-*)
+
+echo "Preparing libevent work area. This may take a while..."
+make -j $NUM_JOBS clean
+
+rm -rf $DESTDIR
+
+echo "Configuring libevent..."
+CFLAGS="$CFLAGS" ./configure
+
+echo "Building libevent..."
+make -j $NUM_JOBS
+
+echo "Installing libevent..."
+make -j $NUM_JOBS install DESTDIR=$DESTDIR
+
+echo "Reducing libevent size..."
+strip -g $DESTDIR/usr/bin/*
+
+ROOTFS="$WORK_DIR/src/minimal_overlay/rootfs"
+
+cp -r $DESTDIR/usr/local/* $ROOTFS
+
+echo "libevent has been installed."
+
+cd $SRC_DIR

src/minimal_overlay/bundles/libevent/bundle.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+SRC_DIR=$(pwd)
+
+./01_get.sh
+./02_build.sh
+
+cd $SRC_DIR
+