Add rootfs generator for Ubuntu 14.04

tools/qemu-debian-img/14.04/Dockerfile

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+# Copyright 2018 Mikhail Klementev. All rights reserved.
+# Use of this source code is governed by a AGPLv3 license
+# (or later) that can be found in the LICENSE file.
+#
+# Usage:
+#
+#     $ docker build -t gen-ubuntu1404-image .
+#     $ docker run --privileged -v $(pwd):/shared -t gen-ubuntu1404-image
+#
+# ubuntu1404.img will be created in current directory. You can change $(pwd) to
+# different directory to use different destination for image.
+#
+FROM ubuntu:14.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update
+RUN apt-get install -y debootstrap qemu
+
+ENV TMPDIR=/tmp/ubuntu
+ENV IMAGEDIR=/tmp/image
+ENV IMAGE=/shared/out_of_tree_ubuntu_14__04.img
+ENV REPOSITORY=http://archive.ubuntu.com/ubuntu
+ENV RELEASE=trusty
+
+RUN mkdir $IMAGEDIR
+
+# Must be executed with --privileged because of /dev/loop
+CMD debootstrap --include=openssh-server $RELEASE $TMPDIR $REPOSITORY && \
+	/shared/setup.sh $TMPDIR && \
+	qemu-img create $IMAGE 2G && \
+	mkfs.ext4 -F $IMAGE && \
+	mount -o loop $IMAGE $IMAGEDIR && \
+	cp -a $TMPDIR/* $IMAGEDIR/ && \
+	umount $IMAGEDIR

tools/qemu-debian-img/14.04/setup.sh

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+#!/bin/sh -eux
+# Copyright 2018 Mikhail Klementev. All rights reserved.
+# Use of this source code is governed by a AGPLv3 license
+# (or later) that can be found in the LICENSE file.
+TMPDIR=$1
+chroot $TMPDIR /bin/sh -c 'useradd -m user'
+sed -i 's/root:\*:/root::/' $TMPDIR/etc/shadow
+sed -i 's/user:!!:/user::/' $TMPDIR/etc/shadow
+echo auth sufficient pam_permit.so > $TMPDIR/etc/pam.d/sshd
+sed -i '/PermitEmptyPasswords/d' $TMPDIR/etc/ssh/sshd_config
+echo PermitEmptyPasswords yes >> $TMPDIR/etc/ssh/sshd_config
+sed -i '/PermitRootLogin/d' $TMPDIR/etc/ssh/sshd_config
+echo PermitRootLogin yes >> $TMPDIR/etc/ssh/sshd_config
+
+echo '#!/bin/sh' > $TMPDIR/etc/rc.local
+echo 'dhclient eth0' >> $TMPDIR/etc/rc.local
+chmod +x $TMPDIR/etc/rc.local