tako fetch¶

Download or update an image.

Synopsis¶

tako fetch [--init] [--] <config>...
tako fetch -h | --help

Description¶

This command takes one or more config files. For every provided config file, it:

• Downloads the latest manifest from the remote into the destination directory.
• Downloads the latest image, if a newer compatible version exists.
• Symlinks latest in the destination directory to the newly downloaded image.
• Restarts any configured systemd units.

Options¶

--init¶

If this option is enabled, Tako checks if manifest and latest exist in the destination directory. If latest points to a valid image, Tako exits immediately without checking for new versions. In other words, Tako performs a minimal amount of work while still guaranteeing that an image exists in the destination directory if the command exits successfully.

This option can be used to provision an clean system with an initial image. Running tako fetch before starting an application that depends on the image managed by Tako ensures that the image exists when the application starts. When Tako exits with a zero exit code, the image is guaranteed to exist. However, without --init Tako will always download the manifest, and possibly download a new image, even if an older compatible image exists that could be used. This delays application startup, and may prevent startup entirely if fetching fails (due to connectivity issues, for instance). With --init, Tako only performs any work if required to start the dependent application.