80 lines
1.5 KiB
CUE
80 lines
1.5 KiB
CUE
package docker
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import (
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"dagger.io/dagger"
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"dagger.io/dagger/engine"
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)
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// Modular build API for Docker containers
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#Build: {
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steps: [#Step, ...#Step]
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output: #Image
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// Generate build DAG from linerar steps
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_dag: {
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for idx, step in steps {
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"\(idx)": step & {
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// connect input to previous output
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if idx > 0 {
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// FIXME: the intermediary `output` is needed because of a possible CUE bug.
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// `._dag."0".output: 1 errors in empty disjunction::`
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// See: https://github.com/cue-lang/cue/issues/1446
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// input: _dag["\(idx-1)"].output
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_output: _dag["\(idx-1)"].output
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input: _output
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}
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}
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}
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}
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if len(_dag) > 0 {
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output: _dag["\(len(_dag)-1)"].output
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}
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}
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// A build step is anything that produces a docker image
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#Step: {
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input?: #Image
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output: #Image
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...
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}
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// Build step that copies files into the container image
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#Copy: {
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input: #Image
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contents: dagger.#FS
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source: string | *"/"
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dest: string | *"/"
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// Execute copy operation
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_copy: engine.#Copy & {
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"input": input.rootfs
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"contents": contents
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"source": source
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"dest": dest
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}
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output: #Image & {
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config: input.config
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rootfs: _copy.output
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}
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}
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// Build step that executes a Dockerfile
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#Dockerfile: {
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// Source directory
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source: dagger.#FS
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// FIXME: not yet implemented
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*{
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// Look for Dockerfile in source at default path
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path: "Dockerfile"
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} | {
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// Look for Dockerfile in source at a custom path
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path: string
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} | {
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// Custom dockerfile contents
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contents: string
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}
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}
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