79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
package compiler
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import (
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"errors"
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"fmt"
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"io/fs"
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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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)
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// Build a cue configuration tree from the files in fs.
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func Build(sources map[string]fs.FS, args ...string) (*Value, error) {
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c := DefaultCompiler
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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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Overlay: map[string]cueload.Source{},
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}
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// Map the source files into the overlay
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for mnt, f := range sources {
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f := f
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mnt := mnt
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err := fs.WalkDir(f, ".", func(p string, entry fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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if !entry.Type().IsRegular() {
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return nil
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}
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if filepath.Ext(entry.Name()) != ".cue" {
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return nil
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}
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contents, err := fs.ReadFile(f, 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, mnt, 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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}
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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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for _, value := range instances {
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if value.Err != nil {
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return nil, value.Err
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}
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}
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v, err := c.Context.BuildInstances(instances)
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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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for _, value := range v {
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if value.Err() != nil {
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return nil, value.Err()
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}
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}
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if len(v) != 1 {
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return nil, errors.New("internal: wrong number of values")
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}
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return Wrap(v[0]), nil
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}
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