68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
package dagger
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import (
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"context"
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"errors"
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"fmt"
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"path"
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"path/filepath"
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cueerrors "cuelang.org/go/cue/errors"
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cueload "cuelang.org/go/cue/load"
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"github.com/rs/zerolog/log"
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"dagger.io/go/dagger/compiler"
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"dagger.io/go/stdlib"
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)
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// Build a cue configuration tree from the files in fs.
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func CueBuild(ctx context.Context, fs FS, args ...string) (*compiler.Value, error) {
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var (
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err error
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lg = log.Ctx(ctx)
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)
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buildConfig := &cueload.Config{
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// The CUE overlay needs to be prefixed by a non-conflicting path with the
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// local filesystem, otherwise Cue will merge the Overlay with whatever Cue
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// files it finds locally.
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Dir: "/config",
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}
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// Start by creating an overlay with the stdlib
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buildConfig.Overlay, err = stdlib.Overlay(buildConfig.Dir)
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if err != nil {
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return nil, err
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}
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// Add the config files on top of the overlay
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err = fs.Walk(ctx, func(p string, f Stat) error {
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lg.Debug().Str("path", p).Msg("load")
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if f.IsDir() {
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return nil
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}
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if filepath.Ext(p) != ".cue" {
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return nil
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}
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contents, err := fs.ReadFile(ctx, p)
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if err != nil {
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return fmt.Errorf("%s: %w", p, err)
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}
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overlayPath := path.Join(buildConfig.Dir, p)
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buildConfig.Overlay[overlayPath] = cueload.FromBytes(contents)
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return nil
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})
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if err != nil {
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return nil, err
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}
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instances := cueload.Instances(args, buildConfig)
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if len(instances) != 1 {
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return nil, errors.New("only one package is supported at a time")
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}
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inst, err := compiler.Cue().Build(instances[0])
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if err != nil {
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return nil, errors.New(cueerrors.Details(err, &cueerrors.Config{}))
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}
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return compiler.Wrap(inst.Value(), inst), nil
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}
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