Added script which generates MLL image for Docker.

.gitignore

@@ -8,6 +8,7 @@
 /src/work/**
 /src/minimal_linux_live*
 /src/*.img
+/src/*.tgz
 
 /docs/mdbook
 /docs/book/**

src/generate_mll_image.sh

@@ -0,0 +1,110 @@
+#!/bin/sh
+
+set -e
+
+SRC_DIR=$PWD
+STATUS=xxx
+TEMP_DIR=xxx
+MLL_ISO=xxx
+
+finalWords() {
+  cat << CEOF
+
+  Minimal Linux Live image 'mll_image.tgz' has been generated.
+
+  You can import the MLL image in Docker like this:
+
+    docker import mll_image.tgz minimal-linux-live:latest
+
+  Then you can run MLL container in Docker like this:
+
+    docker run -it minimal-linux-live /bin/sh
+
+CEOF
+}
+
+cleanup() {
+  chmod -R ugo+rw $TEMP_DIR
+  rm -rf $TEMP_DIR
+}
+
+buildDockerImage() {
+  rm -f $SRC_DIR/mll_image.tgz
+  cd $TEMP_DIR/docker_root
+  tar -zcf $SRC_DIR/mll_image.tgz *
+  cd $SRC_DIR
+}
+
+prepareDocker() {
+  mkdir $TEMP_DIR/docker_root
+  cp -r $TEMP_DIR/rootfs_extracted/* $TEMP_DIR/docker_root
+  cp -r $TEMP_DIR/iso_extracted/minimal/rootfs/* $TEMP_DIR/docker_root
+}
+
+extractRootfs() {
+  xz -d -k $TEMP_DIR/iso_extracted/rootfs.xz
+  mkdir $TEMP_DIR/rootfs_extracted
+  cp $TEMP_DIR/iso_extracted/rootfs $TEMP_DIR/rootfs_extracted
+  cd $TEMP_DIR/rootfs_extracted
+  cpio -F rootfs -i
+  rm -f rootfs
+  cd $SRC_DIR
+}
+
+extractISO() {
+  xorriso -osirrox on -indev $MLL_ISO -extract / $TEMP_DIR/iso_extracted
+  chmod ugo+rw $TEMP_DIR/iso_extracted
+}
+
+prepareTempDir() {
+  chmod -R ugo+rw mll_docker_*
+  rm -rf mll_docker_*
+  TEMP_DIR=`mktemp -d mll_docker_XXXX`
+}
+
+checkPrerequsites() {
+  if [ "$1" = "" ] ; then
+    if [ -f minimal_linux_live.iso ] ; then
+      echo "Using 'minimal_linux_live.iso' ISO image."
+      MLL_ISO=minimal_linux_live.iso
+    else
+      echo "ISO image 'minimal_linux_live.iso' does not exist. Cannot continue."
+      exit 1
+    fi
+  elif [ ! -f "$1" ] ; then
+    echo "Cannot locate ISO image `$1`. Cannot continue."
+    exit 1
+  else
+    MLL_ISO=$1
+  fi
+
+  STATUS=OK
+
+  if [ "`which docker`" = "" ] ; then
+    STATUS=ERROR
+    echo "ERROR: Cannot locate 'docker'."
+  fi
+
+  if [ "`which xorriso`" = "" ] ; then
+    STATUS=ERROR
+    echo "ERROR: Cannot locate 'xorriso'."
+  fi
+
+  if [ "$STATUS" = "ERROR" ] ; then
+    echo "You have to install 'docker' and 'xorriso'. Cannot continue."
+    exit 1
+  fi
+}
+
+main() {
+  checkPrerequsites "$@"
+  prepareTempDir
+  extractISO
+  extractRootfs
+  prepareDocker
+  buildDockerImage
+  cleanup
+  finalWords
+}
+
+main "$@"