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+This is a project to build a small cloud image that has useful tools and
+function for debugging or developing cloud infrastructure.
+
+The following works on Ubuntu 14.04 LTS.
+
+To use it, you would do something like:
+ * get the build dependencies:
+   $ ./bin/system-setup
+
+ * bzr branch lp:cirros
+ * cd cirros
+
+ * download buildroot and setup environment
+   $ br_ver="2015.05"
+   $ mkdir -p ../download
+   $ ln -snf ../download download
+   $ ( cd download && wget http://buildroot.uclibc.org/downloads/buildroot-${br_ver}.tar.gz )
+   $ tar -xvf download/buildroot-${br_ver}.tar.gz
+   $ ln -snf buildroot-${br_ver} buildroot
+
+ * optionally update src/etc/ssl/certs/ca-certificates.crt
+   This is not required, but can be done to make sure its up to date.
+   Doing so requires cvs.
+   # ./bin/mkcabundle > src/etc/ssl/certs/ca-certificates.crt
+
+ * apply any local cirros patches to buildroot
+   ( cd buildroot && QUILT_PATCHES=$PWD/../patches-buildroot quilt push -a )
+
+ * download the buildroot sources
+   $ make ARCH=i386 br-source
+
+ * Build buildroot for a given arch
+   # ARCH should be set to 'i386', 'x86_64' or 'arm'
+   $ make ARCH=i386 OUT_D=$PWD/output/i386
+
+   This will do a full buildroot build, which will take a while. The output
+   that CirrOS is interested in is output/i386/rootfs.tar.
+   That file is the full buildroot filesystem, and is used as input for
+   subsequent steps here.
+
+ * Download a kernel to use.
+   The kernel input to bundle must be in deb format. The ubuntu '-virtual'
+   kernel is used as a starting point.
+
+   # kver is newest -updates kernel from https://launchpad.net/ubuntu/+source/linux
+   $ kver="3.19.0-20.20~14.04.1"
+   $ ./bin/grab-kernels "$kver"
+
+ * build disk images using bin/bundle
+   $ sudo ./bin/bundle -v --arch=$ARCH output/$ARCH/rootfs.tar \
+      download/kernel-$ARCH.deb output/$ARCH/images
+
+ * Then, test using the images
+   $ kvm -drive file=disk.img,if=virtio -curses
+   $ kvm file=blank.img,if=virtio -curses \
+      -kernel kernel -initrd initrd -drive -append "debug-initrd"