[Bug 2038375] [NEW] unable to provide autoinstall user-data to jammy-server-live-amd64.iso daily images with cloud-init 23.3.1

Tue Oct 3 19:28:38 UTC 2023

Public bug reported:

During manual SRU verification of cloud-init 23.3.1 from jammy-proposed
subiquity is unable to read cloud-init user-data containing autoinstall
directives due to a traceback while trying to invoke stages.Init() prior
to reading cloud-init combined user-data.

### From /var/log/installer/subiquity-server-debug.log
2023-10-03 17:00:49,502 INFO subiquity:163 Starting Subiquity server revision 5097 of snap /snap/subiquity/5097
...
2023-10-03 17:00:53,165 WARNING cloudinit.sources:1727 Failed loading pickled blob from /var/lib/cloud/instance/obj.pkl
2023-10-03 17:00:53,166 DEBUG cloudinit.sources:1736 Failed loading pickled blob from /var/lib/cloud/instance/obj.pkl
Traceback (most recent call last):
  File "/snap/subiquity/5097/usr/lib/python3/dist-packages/cloudinit/sources/__init__.py", line 1170, in pkl_load
    return pickle.loads(pickle_contents)
AttributeError: Can't get attribute 'Udhcpc' on <module 'cloudinit.net.dhcp' from '/snap/subiquity/5097/usr/lib/python3/dist-packages/cloudinit/net/dhcp.py'>

This traceback is due to unpickling errors due to an older version of
cloud-init (23.2.2) installed in the snap being unable to unpickle the
cached datasource written by the host version of cloud-init (23.3.1) at
/var/lib/cloud/isntance/obj.pkl.

Because the subiquity snap updates cloud-init at a different pace than
SRU's of cloud-init into jammy-updates, this issue will show up anytime
cloud-init SRU's an update to classes or attributes related to the
cached datasource object.

To avoid this unpickling incompatibility, subiquity has already landed
an upstream fix[1] to avoid using stages.Init() to read autoinstall
configuration, but read cloud-init's processed config artifact at
/run/cloud-init/combined-cloud-config.json.

### References:
1: upstream fix to prefer /run/cloud-init/combined-cloud-config.json over stages.Init()
    https://github.com/canonical/subiquity/commit/751119866

### Reproducer steps:
## to be updated

wget https://cdimage.ubuntu.com/ubuntu-server/jammy/daily-
live/current/jammy-live-server-amd64.iso

pull-lp-debs cloud-init jammy-updates
# inject cloud-init from jammy-proposed
cat > proposed-actions.yaml <<EOF
- name: setup-rootfs
- name: cp
  source: /home/csmith/src/subiquity/cloud-init_23.3.1-0ubuntu1~22.04.1_all.deb
  dest: rootfs/cloud-init_23.3.1-0ubuntu1~22.04.1_all.deb
- name: shell
EOF

git clone git at github.com:mwhudson/livefs-editor.git
sudo PYTHONPATH=./livefs-editor python3 -m livefs_edit ./ubuntu-22.04.3-live-server-amd64.iso ./proposed-jammy-server.iso --actions proposed-actions.yaml

# At the /tmp prompt
chroot rootfs
dpkg -i /cloud-init*deb
exit
exit

mkdir -p ~/cidata
cd ~/cidata
cat > user-data << 'EOF'
#cloud-config
autoinstall:
  version: 1
  identity:
    hostname: ubuntu-server
    password: "$6$exDY1mhS4KUYCE/2$zmn9ToZwTKLhCw.b4/b.ZRTIZM30JZ4QrOQ2aOXJ8yk96xpcCof0kxKwuX1kqLG/ygbJ1f8wxED22bTL4F46P0"
    username: ubuntu
EOF
touch meta-data
cloud-localds ~/seed.iso user-data meta-data
truncate -s 10G image.img

$ kvm -name ci-test-kvm-live-server-ephemeral-1 -m 3G -drive
file=image.img,format=raw,if=virtio -net nic -D qemu.log -net
user,hostfwd=tcp::2222-:22 -cdrom ./proposed-jammy-server.iso -drive
file=~/seed.iso,format=raw,if=ide -kernel /tmp/tmp1gro8vnk/vmlinuz
-initrd /tmp/tmp1gro8vnk/initrd -append console=ttyS0 autoinstall
-nographic

** Affects: cloud-init (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: subiquity (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- nable to provide autoinstall user-data to jammy-server-live-amd64.iso daily images with cloud-init 23.3.1
+ unable to provide autoinstall user-data to jammy-server-live-amd64.iso daily images with cloud-init 23.3.1

-- 
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https://bugs.launchpad.net/bugs/2038375

Title:
  unable to provide autoinstall user-data to jammy-server-live-amd64.iso
  daily images with cloud-init 23.3.1

Status in cloud-init package in Ubuntu:
  New
Status in subiquity package in Ubuntu:
  New

Bug description:
  During manual SRU verification of cloud-init 23.3.1 from jammy-
  proposed subiquity is unable to read cloud-init user-data containing
  autoinstall directives due to a traceback while trying to invoke
  stages.Init() prior to reading cloud-init combined user-data.

  ### From /var/log/installer/subiquity-server-debug.log
  2023-10-03 17:00:49,502 INFO subiquity:163 Starting Subiquity server revision 5097 of snap /snap/subiquity/5097
  ...
  2023-10-03 17:00:53,165 WARNING cloudinit.sources:1727 Failed loading pickled blob from /var/lib/cloud/instance/obj.pkl
  2023-10-03 17:00:53,166 DEBUG cloudinit.sources:1736 Failed loading pickled blob from /var/lib/cloud/instance/obj.pkl
  Traceback (most recent call last):
    File "/snap/subiquity/5097/usr/lib/python3/dist-packages/cloudinit/sources/__init__.py", line 1170, in pkl_load
      return pickle.loads(pickle_contents)
  AttributeError: Can't get attribute 'Udhcpc' on <module 'cloudinit.net.dhcp' from '/snap/subiquity/5097/usr/lib/python3/dist-packages/cloudinit/net/dhcp.py'>

  This traceback is due to unpickling errors due to an older version of
  cloud-init (23.2.2) installed in the snap being unable to unpickle the
  cached datasource written by the host version of cloud-init (23.3.1)
  at /var/lib/cloud/isntance/obj.pkl.

  Because the subiquity snap updates cloud-init at a different pace than
  SRU's of cloud-init into jammy-updates, this issue will show up
  anytime cloud-init SRU's an update to classes or attributes related to
  the cached datasource object.

  To avoid this unpickling incompatibility, subiquity has already landed
  an upstream fix[1] to avoid using stages.Init() to read autoinstall
  configuration, but read cloud-init's processed config artifact at
  /run/cloud-init/combined-cloud-config.json.

  ### References:
  1: upstream fix to prefer /run/cloud-init/combined-cloud-config.json over stages.Init()
      https://github.com/canonical/subiquity/commit/751119866

  ### Reproducer steps:
  ## to be updated

  wget https://cdimage.ubuntu.com/ubuntu-server/jammy/daily-
  live/current/jammy-live-server-amd64.iso

  pull-lp-debs cloud-init jammy-updates
  # inject cloud-init from jammy-proposed
  cat > proposed-actions.yaml <<EOF
  - name: setup-rootfs
  - name: cp
    source: /home/csmith/src/subiquity/cloud-init_23.3.1-0ubuntu1~22.04.1_all.deb
    dest: rootfs/cloud-init_23.3.1-0ubuntu1~22.04.1_all.deb
  - name: shell
  EOF

  git clone git at github.com:mwhudson/livefs-editor.git
  sudo PYTHONPATH=./livefs-editor python3 -m livefs_edit ./ubuntu-22.04.3-live-server-amd64.iso ./proposed-jammy-server.iso --actions proposed-actions.yaml

  # At the /tmp prompt
  chroot rootfs
  dpkg -i /cloud-init*deb
  exit
  exit

  mkdir -p ~/cidata
  cd ~/cidata
  cat > user-data << 'EOF'
  #cloud-config
  autoinstall:
    version: 1
    identity:
      hostname: ubuntu-server
      password: "$6$exDY1mhS4KUYCE/2$zmn9ToZwTKLhCw.b4/b.ZRTIZM30JZ4QrOQ2aOXJ8yk96xpcCof0kxKwuX1kqLG/ygbJ1f8wxED22bTL4F46P0"
      username: ubuntu
  EOF
  touch meta-data
  cloud-localds ~/seed.iso user-data meta-data
  truncate -s 10G image.img

  $ kvm -name ci-test-kvm-live-server-ephemeral-1 -m 3G -drive
  file=image.img,format=raw,if=virtio -net nic -D qemu.log -net
  user,hostfwd=tcp::2222-:22 -cdrom ./proposed-jammy-server.iso -drive
  file=~/seed.iso,format=raw,if=ide -kernel /tmp/tmp1gro8vnk/vmlinuz
  -initrd /tmp/tmp1gro8vnk/initrd -append console=ttyS0 autoinstall
  -nographic

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