This repository has been archived on 2024-04-08. You can view files and clone it, but cannot push or open issues or pull requests.
dagger/plan/task/readfile.go
Andrea Luzzardi dd2fef8a2d engine.#ReadFile
Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
2021-12-15 14:35:08 +01:00

47 lines
1.1 KiB
Go

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