Add new Client API

Signed-off-by: Helder Correia <174525+helderco@users.noreply.github.com>

plan/task/clientfilesystemwrite.go

@@ -0,0 +1,100 @@
+package task
+
+import (
+	"context"
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+
+	"cuelang.org/go/cue"
+	bk "github.com/moby/buildkit/client"
+	"github.com/rs/zerolog/log"
+	"go.dagger.io/dagger/compiler"
+	"go.dagger.io/dagger/plancontext"
+	"go.dagger.io/dagger/solver"
+)
+
+func init() {
+	Register("ClientFilesystemWrite", func() Task { return &clientFilesystemWriteTask{} })
+}
+
+type clientFilesystemWriteTask struct {
+}
+
+func (t clientFilesystemWriteTask) 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
+	}
+
+	path, err = filepath.Abs(path)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := t.writeContents(ctx, pctx, s, v, path); err != nil {
+		return nil, err
+	}
+
+	return compiler.NewValue(), nil
+}
+
+func (t clientFilesystemWriteTask) writeContents(ctx context.Context, pctx *plancontext.Context, s solver.Solver, v *compiler.Value, path string) error {
+	lg := log.Ctx(ctx)
+	contents := v.Lookup("contents")
+
+	if plancontext.IsFSValue(contents) {
+		lg.Debug().Str("path", path).Msg("writing files to local directory")
+		return t.writeFS(ctx, pctx, s, contents, path)
+	}
+
+	permissions := fs.FileMode(0644) // default permission
+	if vl := v.Lookup("permissions"); vl.Exists() {
+		p, err := vl.Int64()
+		if err != nil {
+			return err
+		}
+		permissions = fs.FileMode(p)
+	}
+
+	if plancontext.IsSecretValue(contents) {
+		lg.Debug().Str("path", path).Msg("writing secret to local file")
+		secret, err := pctx.Secrets.FromValue(contents)
+		if err != nil {
+			return err
+		}
+		return os.WriteFile(path, []byte(secret.PlainText()), permissions)
+	}
+
+	k := contents.Kind()
+	if k == cue.StringKind {
+		lg.Debug().Str("path", path).Msg("writing to local file")
+		text, err := contents.String()
+		if err != nil {
+			return err
+		}
+		return os.WriteFile(path, []byte(text), permissions)
+	}
+
+	return fmt.Errorf("unsupported type %q", k)
+}
+
+func (t clientFilesystemWriteTask) writeFS(ctx context.Context, pctx *plancontext.Context, s solver.Solver, v *compiler.Value, path string) error {
+	contents, err := pctx.FS.FromValue(v)
+	if err != nil {
+		return err
+	}
+
+	st, err := contents.State()
+	if err != nil {
+		return err
+	}
+
+	_, err = s.Export(ctx, st, nil, bk.ExportEntry{
+		Type:      bk.ExporterLocal,
+		OutputDir: path,
+	}, pctx.Platform.Get())
+
+	return err
+}