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dagger/plan/task/source.go

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package task
import (
"context"
"errors"
"fmt"
"os"
"strings"
"github.com/moby/buildkit/client/llb"
"github.com/rs/zerolog/log"
"go.dagger.io/dagger/compiler"
"go.dagger.io/dagger/plancontext"
"go.dagger.io/dagger/solver"
)
func init() {
Register("Source", func() Task { return &sourceTask{} })
}
type sourceTask struct {
}
func (c *sourceTask) PreRun(_ context.Context, pctx *plancontext.Context, v *compiler.Value) error {
origPath, err := v.Lookup("path").String()
if err != nil {
return err
}
absPath, err := v.Lookup("path").AbsPath()
if err != nil {
return err
}
location, err := v.Lookup("path").Dirname()
if err != nil {
return err
}
if !strings.HasPrefix(absPath, location) {
return fmt.Errorf("path %q is not relative", origPath)
}
if _, err := os.Stat(absPath); errors.Is(err, os.ErrNotExist) {
return fmt.Errorf("path %q does not exist", origPath)
}
pctx.LocalDirs.Add(absPath)
return nil
}
func (c *sourceTask) Run(ctx context.Context, pctx *plancontext.Context, s *solver.Solver, v *compiler.Value) (*compiler.Value, error) {
lg := log.Ctx(ctx)
path, err := v.Lookup("path").AbsPath()
if err != nil {
return nil, err
}
var source struct {
Include []string
Exclude []string
}
if err := v.Decode(&source); err != nil {
return nil, err
}
lg.Debug().Str("path", path).Msg("loading local directory")
opts := []llb.LocalOption{
withCustomName(v, "Embed %s", path),
llb.IncludePatterns(source.Include),
llb.ExcludePatterns(source.Exclude),
// Without hint, multiple `llb.Local` operations on the
// same path get a different digest.
llb.SessionID(s.SessionID()),
llb.SharedKeyHint(path),
}
// FIXME: Remove the `Copy` and use `Local` directly.
//
// Copy'ing is a costly operation which should be unnecessary.
// However, using llb.Local directly breaks caching sometimes for unknown reasons.
st := llb.Scratch().File(
llb.Copy(
llb.Local(
path,
opts...,
),
"/",
"/",
),
withCustomName(v, "Embed %s [copy]", path),
)
result, err := s.Solve(ctx, st, pctx.Platform.Get())
if err != nil {
return nil, err
}
fs := pctx.FS.New(result)
return compiler.NewValue().FillFields(map[string]interface{}{
"output": fs.MarshalCUE(),
})
}