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README.md

image2disk

quay.io/tinkerbell/actions/image2disk:latest

This Action will stream a remote disk image (raw) to a block device, and is mainly used to write cloud images to a disk. It is recommended to use the qemu-img tool to convert disk images into raw, it is also possible to compress the raw images with tar+gzip to prevent wasted disk space.

env var data type default value required description
IMG_URL string "" yes URL of the image to be streamed
DEST_DISK string "" yes Block device to which to write the image
COMPRESSED bool false no Decompress the image before writing it to the disk
RETRY_ENABLED bool false no Retry the Action, using exponential backoff, for the duration specified in RETRY_DURATION_MINUTES before failing
RETRY_DURATION_MINUTES int 10 no Duration for which the Action will retry before failing
PROGRESS_INTERVAL_SECONDS int 3 no Interval at which the progress of the image transfer will be logged
TEXT_LOGGING bool false no Output from the Action will be logged in a more human friendly text format, JSON format is used by default

The below example will stream a raw ubuntu cloud image (converted by qemu-img) and write it to the block storage disk /dev/sda. The raw image is uncompressed in this example.

qemu-img convert ubuntu.img ubuntu.raw
actions:
- name: "stream ubuntu"
  image: quay.io/tinkerbell/actions/image2disk:latest
  timeout: 90
  environment:
      IMG_URL: http://192.168.1.2/ubuntu.raw
      DEST_DISK: /dev/sda
      COMPRESSED: false

The below example will stream a compressed raw ubuntu cloud image (converted by qemu-img) and write it to the block storage disk /dev/sda. The raw image is compressed with gzip in this example.

qemu-img convert ubuntu.img ubuntu.raw
gzip ubuntu.raw
actions:
- name: "stream ubuntu"
  image: quay.io/tinkerbell/actions/image2disk:latest
  timeout: 90
  environment:
      IMG_URL: http://192.168.1.2/ubuntu.tar.gz
      DEST_DISK: /dev/sda
      COMPRESSED: true

Supported Compression formats

  • bzip2 (.bzip2)
  • gzip (.gz)
  • xz (.xz)
  • xs (.xs)