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[Bug 1820360] [NEW] unable to specify custom seed location on raspberry pi arm64

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Public bug reported:

Hello, I'm trying to bootstrap the Raspberry Pi Arm64 image from (http://cdimage.ubuntu.com/ubuntu/releases/bionic/release/) using cloud-init.
In order to customize the seed I tried to specify the following kernel cmdline in cmdline.txt:
$ cat cmdline.txt # corresponds to kernel cmdline
net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait ds=nocloud;seedfrom=file://boot/seed/

In /boot/seed (VFAT partition) these are the contents:

$ cat /boot/seed/meta-data
instance_id: cloud-image
$ cat /boot/seed/user-data
#cloud-config
# vim: syntax=yaml
#

ssh_pwauth: True

hostname: rpi3plus
locale: "en_US.UTF-8"
timezone: "Europe/Rome"

users:
- name: devster
  gecos: Daniele Riccucci
  ssh_authorized_keys:
  - ssh-ed25519 <mykey>
  lock_passwd: false
  passwd: <hashed pw>

package_update: true
package_upgrade: true
package_reboot_if_required: true

Cloud-init ran, however the following happened (I had to remove the SD
card and mount it somewhere else to retrieve this cloud-init.log
(beginning only):

2018-01-28 15:58:24,891 - util.py[DEBUG]: Cloud-init v. 18.4-0ubuntu1~18.04.1 running 'init-local' at Sun, 28 Jan 2018 15:58:24 +0000. Up 16.85 seconds.
2018-01-28 15:58:24,892 - main.py[DEBUG]: No kernel command line url found.
2018-01-28 15:58:24,892 - main.py[DEBUG]: Closing stdin.
2018-01-28 15:58:24,912 - util.py[DEBUG]: Writing to /var/log/cloud-init.log - ab: [644] 0 bytes
2018-01-28 15:58:24,916 - util.py[DEBUG]: Changing the ownership of /var/log/cloud-init.log to 102:4
2018-01-28 15:58:24,918 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/instance/boot-finished
2018-01-28 15:58:24,918 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/data/no-net
2018-01-28 15:58:24,919 - handlers.py[DEBUG]: start: init-local/check-cache: attempting to read from cache [check]
2018-01-28 15:58:24,919 - util.py[DEBUG]: Reading from /var/lib/cloud/instance/obj.pkl (quiet=False)
2018-01-28 15:58:24,920 - stages.py[DEBUG]: no cache found
2018-01-28 15:58:24,920 - handlers.py[DEBUG]: finish: init-local/check-cache: SUCCESS: no cache found
2018-01-28 15:58:24,921 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/instance
2018-01-28 15:58:24,934 - stages.py[DEBUG]: Using distro class <class 'cloudinit.distros.ubuntu.Distro'>
2018-01-28 15:58:24,936 - __init__.py[DEBUG]: Looking for data source in: ['NoCloud', 'None'], via packages ['', 'cloudinit.sources'] that matches dependencies ['FILESYSTEM']
2018-01-28 15:58:24,951 - __init__.py[DEBUG]: Searching for local data source in: ['DataSourceNoCloud']
2018-01-28 15:58:24,952 - handlers.py[DEBUG]: start: init-local/search-NoCloud: searching for local data from DataSourceNoCloud
2018-01-28 15:58:24,952 - __init__.py[DEBUG]: Seeing if we can get any data from <class 'cloudinit.sources.DataSourceNoCloud.DataSourceNoCloud'>
2018-01-28 15:58:24,953 - __init__.py[DEBUG]: Update datasource metadata and network config due to events: New instance first boot
[...]

It seems the data source wasn't found and cloud-init couldn't find my specified seed.
The following is the beginning of cloud-init-output.log:

Cloud-init v. 18.4-0ubuntu1~18.04.1 running 'init-local' at Sun, 28 Jan 2018 15:58:24 +0000. Up 16.85 seconds.
2018-01-28 15:58:25,118 - util.py[WARNING]: Getting data from <class 'cloudinit.sources.DataSourceNoCloud.DataSourceNoCloud'> failed
[...]

As expected the directory /var/lib/cloud/instances/iid-datasource-none
was present.

How can I solve?
Thank you.

** Affects: cloud-init
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1820360

Title:
  unable to specify custom seed location on raspberry pi arm64

Status in cloud-init:
  New

Bug description:
  Hello, I'm trying to bootstrap the Raspberry Pi Arm64 image from (http://cdimage.ubuntu.com/ubuntu/releases/bionic/release/) using cloud-init.
  In order to customize the seed I tried to specify the following kernel cmdline in cmdline.txt:
  $ cat cmdline.txt # corresponds to kernel cmdline
  net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait ds=nocloud;seedfrom=file://boot/seed/

  In /boot/seed (VFAT partition) these are the contents:

  $ cat /boot/seed/meta-data
  instance_id: cloud-image
  $ cat /boot/seed/user-data
  #cloud-config
  # vim: syntax=yaml
  #

  ssh_pwauth: True

  hostname: rpi3plus
  locale: "en_US.UTF-8"
  timezone: "Europe/Rome"

  users:
  - name: devster
    gecos: Daniele Riccucci
    ssh_authorized_keys:
    - ssh-ed25519 <mykey>
    lock_passwd: false
    passwd: <hashed pw>

  package_update: true
  package_upgrade: true
  package_reboot_if_required: true

  Cloud-init ran, however the following happened (I had to remove the SD
  card and mount it somewhere else to retrieve this cloud-init.log
  (beginning only):

  2018-01-28 15:58:24,891 - util.py[DEBUG]: Cloud-init v. 18.4-0ubuntu1~18.04.1 running 'init-local' at Sun, 28 Jan 2018 15:58:24 +0000. Up 16.85 seconds.
  2018-01-28 15:58:24,892 - main.py[DEBUG]: No kernel command line url found.
  2018-01-28 15:58:24,892 - main.py[DEBUG]: Closing stdin.
  2018-01-28 15:58:24,912 - util.py[DEBUG]: Writing to /var/log/cloud-init.log - ab: [644] 0 bytes
  2018-01-28 15:58:24,916 - util.py[DEBUG]: Changing the ownership of /var/log/cloud-init.log to 102:4
  2018-01-28 15:58:24,918 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/instance/boot-finished
  2018-01-28 15:58:24,918 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/data/no-net
  2018-01-28 15:58:24,919 - handlers.py[DEBUG]: start: init-local/check-cache: attempting to read from cache [check]
  2018-01-28 15:58:24,919 - util.py[DEBUG]: Reading from /var/lib/cloud/instance/obj.pkl (quiet=False)
  2018-01-28 15:58:24,920 - stages.py[DEBUG]: no cache found
  2018-01-28 15:58:24,920 - handlers.py[DEBUG]: finish: init-local/check-cache: SUCCESS: no cache found
  2018-01-28 15:58:24,921 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/instance
  2018-01-28 15:58:24,934 - stages.py[DEBUG]: Using distro class <class 'cloudinit.distros.ubuntu.Distro'>
  2018-01-28 15:58:24,936 - __init__.py[DEBUG]: Looking for data source in: ['NoCloud', 'None'], via packages ['', 'cloudinit.sources'] that matches dependencies ['FILESYSTEM']
  2018-01-28 15:58:24,951 - __init__.py[DEBUG]: Searching for local data source in: ['DataSourceNoCloud']
  2018-01-28 15:58:24,952 - handlers.py[DEBUG]: start: init-local/search-NoCloud: searching for local data from DataSourceNoCloud
  2018-01-28 15:58:24,952 - __init__.py[DEBUG]: Seeing if we can get any data from <class 'cloudinit.sources.DataSourceNoCloud.DataSourceNoCloud'>
  2018-01-28 15:58:24,953 - __init__.py[DEBUG]: Update datasource metadata and network config due to events: New instance first boot
  [...]

  It seems the data source wasn't found and cloud-init couldn't find my specified seed.
  The following is the beginning of cloud-init-output.log:

  Cloud-init v. 18.4-0ubuntu1~18.04.1 running 'init-local' at Sun, 28 Jan 2018 15:58:24 +0000. Up 16.85 seconds.
  2018-01-28 15:58:25,118 - util.py[WARNING]: Getting data from <class 'cloudinit.sources.DataSourceNoCloud.DataSourceNoCloud'> failed
  [...]

  As expected the directory /var/lib/cloud/instances/iid-datasource-none
  was present.

  How can I solve?
  Thank you.

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