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dagger/plan/task/pull.go
Andrea Luzzardi ff6c7d1c1f engine.#Pull implementation
Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
2021-12-13 16:13:49 +01:00

80 lines
1.9 KiB
Go

package task
import (
"context"
"encoding/json"
"fmt"
"cuelang.org/go/cue"
"github.com/docker/distribution/reference"
"github.com/moby/buildkit/client/llb"
"go.dagger.io/dagger/compiler"
"go.dagger.io/dagger/plancontext"
"go.dagger.io/dagger/solver"
)
func init() {
Register("Pull", func() Task { return &pullTask{} })
}
type pullTask struct {
}
func (c *pullTask) Run(ctx context.Context, pctx *plancontext.Context, s solver.Solver, v *compiler.Value) (*compiler.Value, error) {
// FIXME: handle auth
rawRef, err := v.Lookup("source").String()
if err != nil {
return nil, err
}
ref, err := reference.ParseNormalizedNamed(rawRef)
if err != nil {
return nil, fmt.Errorf("failed to parse ref %s: %w", rawRef, err)
}
// Add the default tag "latest" to a reference if it only has a repo name.
ref = reference.TagNameOnly(ref)
st := llb.Image(
ref.String(),
withCustomName(v, "FetchContainer %s", rawRef),
)
// Load image metadata and convert to to LLB.
platform := pctx.Platform.Get()
image, digest, err := s.ResolveImageConfig(ctx, ref.String(), llb.ResolveImageConfigOpt{
LogName: vertexNamef(v, "load metadata for %s", ref.String()),
Platform: &platform,
})
if err != nil {
return nil, err
}
imageJSON, err := json.Marshal(image)
if err != nil {
return nil, err
}
// Apply Image Config on top of LLB instructions
st, err = st.WithImageConfig(imageJSON)
if err != nil {
return nil, err
}
result, err := s.Solve(ctx, st, pctx.Platform.Get())
if err != nil {
return nil, err
}
fs := pctx.FS.New(result)
out := compiler.NewValue()
if err := out.FillPath(cue.ParsePath("output"), fs.MarshalCUE()); err != nil {
return nil, err
}
if err := out.FillPath(cue.ParsePath("digest"), digest.String()); err != nil {
return nil, err
}
if err := out.FillPath(cue.ParsePath("config"), image.Config); err != nil {
return nil, err
}
return out, nil
}