[Bug 2060463] Re: curtin raises an error using the bcache storage layout

[Jacopo Rota]

Adding curtin for visibility

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

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Title:
  curtin raises an error using the bcache storage layout

Status in curtin:
  New
Status in MAAS:
  Triaged

Bug description:
  Using bcache as storage layout raises an error during the deployment
  phase of a(n arm64) machine. Any other storage layout complete the
  deployment successfully without errors.

  This has been observed consistently in 3 different machines, all
  arm64, deploying Ubuntu 22 and 20. The MAAS installation used is snap
  for the version 3.2.

  The error reported in the machine installation logs ("Installation
  output" tab) is as follows:

  '''
          Running command ['umount', '/tmp/tmptbdyj261/target/dev'] with allowed return codes [0] (capture=False)
          finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/install-grub: FAIL: installing grub to target devices
          finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/configuring-bootloader: FAIL: configuring target system bootloader
          finish: cmd-install/stage-curthooks/builtin/cmd-curthooks: FAIL: curtin command curthooks
          Traceback (most recent call last):
            File "/curtin/curtin/commands/main.py", line 202, in main
              ret = args.func(args)
            File "/curtin/curtin/commands/curthooks.py", line 1886, in curthooks
              builtin_curthooks(cfg, target, state)
            File "/curtin/curtin/commands/curthooks.py", line 1851, in builtin_curthooks
              setup_grub(cfg, target, osfamily=osfamily,
            File "/curtin/curtin/commands/curthooks.py", line 804, in setup_grub
              install_grub(instdevs, target, uefi=uefi_bootable, grubcfg=grubcfg)
            File "/curtin/curtin/commands/install_grub.py", line 401, in install_grub
              in_chroot.subp(cmd, env=env, capture=True)
            File "/curtin/curtin/util.py", line 787, in subp
              return subp(*args, **kwargs)
            File "/curtin/curtin/util.py", line 275, in subp
              return _subp(*args, **kwargs)
            File "/curtin/curtin/util.py", line 139, in _subp
              raise ProcessExecutionError(stdout=out, stderr=err,
          curtin.util.ProcessExecutionError: Unexpected error while running command.
          Command: ['unshare', '--fork', '--pid', '--', 'chroot', '/tmp/tmptbdyj261/target', '/usr/lib/grub/grub-multi-install']
          Exit code: 1
          Reason: -
          Stdout: ''
          Stderr: Installing grub to /boot/efi.
                  Installing for arm64-efi platform.
                  Installation finished. No error reported.
                  Installing grub to /var/lib/grub/esp.
                  Installing for arm64-efi platform.
                  grub-install: error: /var/lib/grub/esp doesn't look like an EFI partition.
  '''

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