47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
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package task
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import (
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"context"
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"fmt"
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"io/fs"
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"cuelang.org/go/cue"
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"go.dagger.io/dagger/compiler"
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"go.dagger.io/dagger/plancontext"
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"go.dagger.io/dagger/solver"
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)
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func init() {
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Register("ReadFile", func() Task { return &readFileTask{} })
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}
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type readFileTask struct {
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}
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func (t *readFileTask) Run(ctx context.Context, pctx *plancontext.Context, s solver.Solver, v *compiler.Value) (*compiler.Value, error) {
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path, err := v.Lookup("path").String()
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if err != nil {
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return nil, err
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}
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input, err := pctx.FS.FromValue(v.Lookup("input"))
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if err != nil {
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return nil, err
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}
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inputFS := solver.NewBuildkitFS(input.Result())
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// FIXME: we should create an intermediate image containing only `path`.
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// That way, on cache misses, we'll only download the layer with the file contents rather than the entire FS.
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contents, err := fs.ReadFile(inputFS, path)
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if err != nil {
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return nil, fmt.Errorf("ReadFile %s: %w", path, err)
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}
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output := compiler.NewValue()
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if err := output.FillPath(cue.ParsePath("contents"), string(contents)); err != nil {
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return nil, err
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}
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return output, nil
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}
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