Output formats¶

outputs: is a list of output specs. tailor creates one artifact per selected cell × output. Each spec's format is required, and an unknown format is rejected at validate time.

outputs:
  - format: cosi

Format	Artifact extension/name
`cosi`	`.cosi`
`vhd`	`.vhd`
`vhd-fixed`	`.vhd`
`vhdx`	`.vhdx`
`qcow2`	`.qcow2`
`raw`	`.raw`
`iso`	`.iso`
`pxe-dir`	directory named as the cell slug
`pxe-tar`	`.tar.gz`
`baremetal-image`	`.raw`

Optional output fields:

Field	Meaning
`cosiCompressionLevel`	COSI compression level. tailor passes IC `--cosi-compression-level` when set.
`compression`	Post-build compression tailor applies to the artifact (`zstd` ⇒ `<slug>.<ext>.zst`). Not an IC feature; see below.
`name`	Optional `${...}` template for the output basename.

Compression¶

compression: zstd makes tailor compress the finished artifact: IC writes the raw image, then tailor streams it through zstd and publishes <slug>.<ext>.zst, dropping the uncompressed original.

Only the raw disk-image formats support it — vhd, vhd-fixed, vhdx, qcow2, raw, baremetal-image. It is rejected on cosi (IC already compresses it via cosiCompressionLevel), iso (would break bootability), and pxe-dir/pxe-tar (a directory / an already-gzipped tar).

outputs:
  - format: vhd-fixed
    compression: zstd     # → <slug>.vhd.zst

Use $replace in a fragment when you want to swap inherited outputs instead of appending another output.