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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 18.04 LTS, running on x86_64. Native building for other architectures is not recommended. To use it, you would do something like: * get the build dependencies: $ ./bin/system-setup * git clone https://git.launchpad.net/~cirros-dev/cirros or git clone git://git.launchpad.net/~cirros-dev/cirros or git clone git+ssh://git.launchpad.net/~cirros-dev/cirros * cd cirros * download buildroot and setup environment $ br_ver="2019.02.1" $ 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-${br_ver} buildroot * optionally update src/etc/ssl/certs/ca-certificates.crt This is not required, but can be done to make sure its up to date. # wget https://github.com/mozilla/gecko-dev/raw/master/security/nss/lib/ckfw/builtins/certdata.txt -O certdata.txt # ./bin/mkcabundle <certdata.txt > src/etc/ssl/certs/ca-certificates.crt * apply any local cirros patches to buildroot ( cd buildroot && QUILT_PATCHES=$PWD/../patches-buildroot quilt push -a ) * download the buildroot sources $ ARCH=i386 $ make ARCH=$ARCH br-source * Build buildroot for a given arch # ARCH should be set to 'i386', 'x86_64', 'arm' or 'aarch64' $ make ARCH=$ARCH OUT_D=$PWD/output/$ARCH 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="4.4.0-148.174" $ ./bin/grab-kernels "$kver" $ARCH * Download EFI grub to use. The grub-efi input to bundle will be in tar.gz format. # gver is newest from https://launchpad.net/ubuntu/+source/grub2 $ gver="2.02~beta2-36ubuntu3.22" $ ./bin/grab-grub-efi "$gver" $ARCH * build disk images using bin/bundle $ sudo ./bin/bundle -v --arch=$ARCH output/$ARCH/rootfs.tar \ download/kernel-$ARCH.deb download/grub-efi-$ARCH.tar.gz 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"
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