** Attachment added: "script that does download for easy test"
   
https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1688606/+attachment/4872380/+files/prepare-1688606.sh

** Description changed:

  === Begin SRU Template ===
  [Impact]
  MAAS has an interest in booting entirely ephemerally without iscsi root.
  The package cloud-initramfs-rooturl supports booting with root coming
  from a url.
    root=http://..../squashfs
  
  This function will be used to pxe boot into a RAM only system with no
  dependency on the network.
  
  [Test Case]
+ See the attached prepare-1688606.sh.  That script automates
+ everything here making this much easier to test.
+ 
  1. make sure squashfs module is in the initramfs
     squashfs module is not automatically added to initramfs in precise.
     Just ensure that it is there.
  
     $ echo "manual_add_modules squashfs" |
        sudo tee /etc/initramfs-tools/hooks/squashfs
  
  2. install cloud-initramfs-rooturl
     sudo apt-get update
     sudo apt-get install cloud-initramfs-rooturl
  
  3. collect the kernel and newly generated initramfs
  
     sudo cat /boot/vmlinu?-$(uname -r) > kernel
     cp /boot/initrd.img-$(uname -r) initrd
  
  4. Download a squashfs image or a .tar.xz image
  
     rel="xenial"
     burl="http://cloud-images.ubuntu.com/daily/server";
     file="$rel-server-cloudimg-amd64-root.tar.xz"
     file="$rel-server-cloudimg-amd64.squashfs"
     wget "$burl/$rel/current/$file" -O "$file"
  
  5. run a web server
     python -m SimpleHTTPServer 9999 &
  
  6. create a seed disk for cloud-init.
  
     $ cat > my-user-data <<EOF
     #cloud-config
     password: passw0rd
     chpasswd: { expire: False }
     ssh_pwauth: True
  
     $ echo "instance-id: $(uuidgen || echo i-abcdefg)" > my-meta-data
     $ cloud-localds seed.img my-user-data my-meta-data
  
  7. Boot a vm using the kernel, initrd and url.
  
     cmdline="root=http://10.0.2.2:9999/$file console=ttyS0 -v "
     cmdline="${cmdline} overlayroot=tmpfs"
  
     qemu-system-x86_64 -enable-kvm \
        -device virtio-net-pci,netdev=net00 \
        -netdev type=user,id=net00 \
        -drive if=virtio,file=seed.img \
        -m 1G -nographic \
        -kernel kernel -initrd initrd \
        -append "root=$cmdline"
  
  [Regression Potential]
  Low.  This is adding a package previously not present.
  
  [Other Info]
  
  === End SRU Template ===

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https://bugs.launchpad.net/bugs/1688606

Title:
  SRU cloud-initramfs-rooturl to archive

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