Add new Client API

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

plan/task/clientenv.go

@@ -0,0 +1,53 @@
+package task
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"cuelang.org/go/cue"
+	"github.com/rs/zerolog/log"
+	"go.dagger.io/dagger/compiler"
+	"go.dagger.io/dagger/plancontext"
+	"go.dagger.io/dagger/solver"
+)
+
+func init() {
+	Register("client.env.*", func() Task { return &clientEnvTask{} })
+}
+
+type clientEnvTask struct {
+}
+
+func (t clientEnvTask) Run(ctx context.Context, pctx *plancontext.Context, _ solver.Solver, v *compiler.Value) (*compiler.Value, error) {
+	lg := log.Ctx(ctx)
+
+	envvar := v.ParentLabel(1)
+
+	lg.Debug().Str("envvar", envvar).Msg("loading environment variable")
+
+	env := os.Getenv(envvar)
+	if env == "" {
+		return nil, fmt.Errorf("environment variable %q not set", envvar)
+	}
+
+	// Resolve default in disjunction if a type hasn't been specified
+	val, _ := v.Default()
+	out := compiler.NewValue()
+
+	if plancontext.IsSecretValue(val) {
+		secret := pctx.Secrets.New(env)
+		return out.Fill(secret.MarshalCUE())
+	}
+
+	if val.IsConcrete() {
+		return nil, fmt.Errorf("unexpected concrete value, please use a type")
+	}
+
+	k := val.IncompleteKind()
+	if k == cue.StringKind {
+		return out.Fill(env)
+	}
+
+	return nil, fmt.Errorf("unsupported type %q", k)
+}