[Bug 2026225] Re: failed kernel mapping specification

[Olivier Gayot]

I'm not sure yet why you ended up in this scenario. It looks like a
subiquity bug.

That said, the install_kernel function in curthooks has code to handle
kernel_cfg=None, but then it invokes the .get() method regardless. This
is obviously wrong.

    if kernel_cfg is not None:
        kernel_package = kernel_cfg.get('package')
        kernel_fallback = kernel_cfg.get('fallback-package')
    else:
        kernel_package = None
        kernel_fallback = None

    config.merge_config(mapping, kernel_cfg.get('mapping', {}))


** Also affects: curtin
   Importance: Undecided
       Status: New

** Changed in: curtin
       Status: New => In Progress

** Changed in: curtin
     Assignee: (unassigned) => Olivier Gayot (ogayot)

** Merge proposal linked:
   https://code.launchpad.net/~ogayot/curtin/+git/curtin/+merge/446197

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https://bugs.launchpad.net/bugs/2026225

Title:
  failed kernel mapping specification

Status in curtin:
  In Progress
Status in subiquity:
  New

Bug description:
  In testing the current desktop installer ISOs with a freshly build
  u-d-i snap, curthooks fails like follows:

   finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/installing-kernel: FAIL: installing kernel
   finish: cmd-install/stage-curthooks/builtin/cmd-curthooks: FAIL: curtin command curthooks
   Traceback (most recent call last):
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/main.py", line 202, in main
       ret = args.func(args)
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/curthooks.py", line 1918, in curthooks
       builtin_curthooks(cfg, target, state)
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/curthooks.py", line 1752, in builtin_curthooks
       install_kernel(cfg, target)
     File "/snap/ubuntu-desktop-installer/x1/lib/python3.10/site-packages/curtin/commands/curthooks.py", line 375, in install_kernel
       config.merge_config(mapping, kernel_cfg.get('mapping', {}))
   AttributeError: 'NoneType' object has no attribute 'get'
   'NoneType' object has no attribute 'get'
   curtin: Installation failed with exception: Unexpected error while running command.
   Command: ['curtin', 'curthooks']
   Exit code: 3
   Reason: -

  happened as part of an autoinstall test, no override of the kernel
  value.

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