Hi, thanks for the reply.

Specifying the path doesn't appear to help. I have tried the following:

* Commissioned a new server

* Set disk config in web ui:

    Used disks and partitions

    Name  Model  Serial BootDevice typeUsed for
    nvme0n1PhysicalGPT partitioned with 1 partition
    nvme0n1-part1Partitionext4 formatted filesystem mounted at /

  ** Without these settings I am unable to deploy due to no disk configuration. **  

* Edited /etc/maas/preseeds/curtin_userdata (After early but before late commands)

    partitioning_commands:
      builtin: [curtin, block-meta, custom]
    storage:
      config:
      - {id: nvme0n1, name: nvme0n1, path: /dev/nvme0n1, ptable: gpt, type: disk, wipe: superblock}
      - {device: nvme0n1, id: nvme0n1p1, name: nvme0n1p1, number: 1, offset: 4194304B, size: 128026935296B, type: partition, uuid: e66f2d9d-963a-4cb9-b2b5-472d491e768b, wipe: superblock}
      - {fstype: ext4, id: nvme0n1p1_format, label: '', type: format, path: /dev/nvme0n1p1, uuid: 6a47f95c-40b6-478a-aefa-ca84a509d877, volume: nvme0n1p1}
      version: 1

** Deployment fails **

If I connect to the failed server I can manually run the commands to try and see what happened.

* ssh node

* /var/lib/cloud/instance/scripts/part-001

* cd curtin

* cat configs/config-002.cfg
partitioning_commands:
  builtin: [curtin, block-meta, custom]
storage:
  config:
  - {grub_device: true, id: sda, model: ST2000DM001-1CH1, name: sda, ptable: msdos,
    serial: Z3409QB2, type: disk, wipe: superblock}
  - {id: sdb, model: ST2000DM001-1CH1, name: sdb, serial: Z3409S81, type: disk, wipe: superblock}
  - {id: sdc, model: Samsung SSD 840, name: sdc, serial: S1D9NSAFB19195M, type: disk,
    wipe: superblock}
  - {id: nvme0n1, name: nvme0n1, path: /dev/nvme0n1, ptable: gpt, type: disk, wipe: superblock}
  - {device: nvme0n1, id: nvme0n1-part1, name: nvme0n1-part1, number: 1, offset: 4194304B,
    size: 128026935296B, type: partition, uuid: e66f2d9d-963a-4cb9-b2b5-472d491e768b,
    wipe: superblock}
  - {fstype: ext4, id: nvme0n1-part1_format, label: '', type: format, uuid: 6a47f95c-40b6-478a-aefa-ca84a509d877,
    volume: nvme0n1-part1}
  - {device: nvme0n1-part1_format, id: nvme0n1-part1_mount, path: /, type: mount}
  version: 1

** The above config appears to have ignored my curtin_userdata settings entirely. **

* cat << EOF > configs/config-002.cfg
> partitioning_commands:
>   builtin: [curtin, block-meta, custom]
> storage:
>   config:
>   - {id: nvme0n1, name: nvme0n1, path: /dev/nvme0n1, ptable: gpt, type: disk, wipe: superblock}
>   - {device: nvme0n1, id: nvme0n1p1, name: nvme0n1p1, number: 1, offset: 4194304B, size: 128026935296B, type: partition, wipe: superblock}
>   - {fstype: ext4, id: nvme0n1p1_format, label: '', type: format, path: /dev/nvme0n1p1, volume: nvme0n1p1}
>   version: 1
> EOF

* bin/curtin --showtrace --install-deps install --config=configs/config-002.cfg http://10.10.4.221:5248/images/ubuntu/amd64/generic/trusty/release/root-tgz
Creating new GPT entries.
The operation has completed successfully.
The operation has completed successfully.
An error occured handling 'nvme0n1p1_format': ValueError - '/dev/nvme0n11': no such file or directory
Traceback (most recent call last):
  File "/home/ubuntu/curtin/curtin/commands/main.py", line 209, in main
    ret = args.func(args)
  File "curtin/commands/block_meta.py", line 62, in block_meta
    meta_custom(args)
  File "curtin/commands/block_meta.py", line 1083, in meta_custom
    handler(command, storage_config_dict)
  File "curtin/commands/block_meta.py", line 672, in format_handler
    mkfs.mkfs_from_config(volume_path, info)
  File "curtin/block/mkfs.py", line 207, in mkfs_from_config
    label=info.get('label'))
  File "curtin/block/mkfs.py", line 145, in mkfs
    raise ValueError("'%s': no such file or directory" % path)
ValueError: '/dev/nvme0n11': no such file or directory
'/dev/nvme0n11': no such file or directory
Installation failed with exception: Unexpected error while running command.
Command: ['curtin', 'block-meta', 'custom']
Exit code: 3
Reason: -
Stdout: 'Creating new GPT entries.\nThe operation has completed successfully.\nThe operation has completed successfully.\nAn error occured handling \'nvme0n1p1_format\': ValueError - \'/dev/nvme0n11\': no such file or directory\nTraceback (most recent call last):\n  File "/home/ubuntu/curtin/curtin/commands/main.py", line 209, in main\n    ret = args.func(args)\n  File "curtin/commands/block_meta.py", line 62, in block_meta\n    meta_custom(args)\n  File "curtin/commands/block_meta.py", line 1083, in meta_custom\n    handler(command, storage_config_dict)\n  File "curtin/commands/block_meta.py", line 672, in format_handler\n    mkfs.mkfs_from_config(volume_path, info)\n  File "curtin/block/mkfs.py", line 207, in mkfs_from_config\n    label=info.get(\'label\'))\n  File "curtin/block/mkfs.py", line 145, in mkfs\n    raise ValueError("\'%s\': no such file or directory" % path)\nValueError: \'/dev/nvme0n11\': no such file or directory\n\'/dev/nvme0n11\': no such file or directory\n'
Stderr: ''
Traceback (most recent call last):
  File "/home/ubuntu/curtin/curtin/commands/main.py", line 209, in main
    ret = args.func(args)
  File "curtin/commands/install.py", line 399, in cmd_install
    raise e
ProcessExecutionError: Unexpected error while running command.
Command: ['curtin', 'block-meta', 'custom']
Exit code: 3
Reason: -
Stdout: 'Creating new GPT entries.\nThe operation has completed successfully.\nThe operation has completed successfully.\nAn error occured handling \'nvme0n1p1_format\': ValueError - \'/dev/nvme0n11\': no such file or directory\nTraceback (most recent call last):\n  File "/home/ubuntu/curtin/curtin/commands/main.py", line 209, in main\n    ret = args.func(args)\n  File "curtin/commands/block_meta.py", line 62, in block_meta\n    meta_custom(args)\n  File "curtin/commands/block_meta.py", line 1083, in meta_custom\n    handler(command, storage_config_dict)\n  File "curtin/commands/block_meta.py", line 672, in format_handler\n    mkfs.mkfs_from_config(volume_path, info)\n  File "curtin/block/mkfs.py", line 207, in mkfs_from_config\n    label=info.get(\'label\'))\n  File "curtin/block/mkfs.py", line 145, in mkfs\n    raise ValueError("\'%s\': no such file or directory" % path)\nValueError: \'/dev/nvme0n11\': no such file or directory\n\'/dev/nvme0n11\': no such file or directory\n'
Stderr: ''
Unexpected error while running command.
Command: ['curtin', 'block-meta', 'custom']
Exit code: 3
Reason: -
Stdout: 'Creating new GPT entries.\nThe operation has completed successfully.\nThe operation has completed successfully.\nAn error occured handling \'nvme0n1p1_format\': ValueError - \'/dev/nvme0n11\': no such file or directory\nTraceback (most recent call last):\n  File "/home/ubuntu/curtin/curtin/commands/main.py", line 209, in main\n    ret = args.func(args)\n  File "curtin/commands/block_meta.py", line 62, in block_meta\n    meta_custom(args)\n  File "curtin/commands/block_meta.py", line 1083, in meta_custom\n    handler(command, storage_config_dict)\n  File "curtin/commands/block_meta.py", line 672, in format_handler\n    mkfs.mkfs_from_config(volume_path, info)\n  File "curtin/block/mkfs.py", line 207, in mkfs_from_config\n    label=info.get(\'label\'))\n  File "curtin/block/mkfs.py", line 145, in mkfs\n    raise ValueError("\'%s\': no such file or directory" % path)\nValueError: \'/dev/nvme0n11\': no such file or directory\n\'/dev/nvme0n11\': no such file or directory\n'
Stderr: ''


Any ideas?

Cheers,
Rob