🎨 Introduce contextualized logging

This commit is multi-fold as it also refactors internally context and logger
as interfaces so it is easier to plug luet as a library externally.

Introduces a garbage collector (related to #227) but doesn't handle yet
parallelism.

Closes #265

pkg/compiler/backend/common.go

@@ -18,9 +18,8 @@ package backend
 import (
 	"os/exec"
 
-	"github.com/mudler/luet/pkg/api/core/types"
-
 	"github.com/google/go-containerregistry/pkg/crane"
+	"github.com/mudler/luet/pkg/api/core/types"
 	"github.com/pkg/errors"
 )
 
@@ -43,9 +42,9 @@ type Options struct {
 	BackendArgs    []string
 }
 
-func runCommand(ctx *types.Context, cmd *exec.Cmd) error {
+func runCommand(ctx types.Context, cmd *exec.Cmd) error {
 	output := ""
-	buffered := !ctx.Config.GetGeneral().ShowBuildOutput
+	buffered := !ctx.GetConfig().General.ShowBuildOutput
 	writer := NewBackendWriter(buffered, ctx)
 
 	cmd.Stdout = writer

pkg/compiler/backend/simpledocker.go

@@ -32,10 +32,10 @@ import (
 )
 
 type SimpleDocker struct {
-	ctx *types.Context
+	ctx types.Context
 }
 
-func NewSimpleDockerBackend(ctx *types.Context) *SimpleDocker {
+func NewSimpleDockerBackend(ctx types.Context) *SimpleDocker {
 	return &SimpleDocker{ctx: ctx}
 }
 
@@ -190,7 +190,7 @@ func (s *SimpleDocker) imageFromCLIPipe(a string) (v1.Image, error) {
 }
 
 func (s *SimpleDocker) imageFromDisk(a string) (v1.Image, error) {
-	f, err := s.ctx.Config.GetSystem().TempFile("snapshot")
+	f, err := s.ctx.TempFile("snapshot")
 	if err != nil {
 		return nil, err
 	}

pkg/compiler/backend/simpledocker_test.go

@@ -16,7 +16,7 @@
 package backend_test
 
 import (
-	"github.com/mudler/luet/pkg/api/core/types"
+	"github.com/mudler/luet/pkg/api/core/context"
 	. "github.com/mudler/luet/pkg/compiler"
 	"github.com/mudler/luet/pkg/compiler/backend"
 	. "github.com/mudler/luet/pkg/compiler/backend"
@@ -34,7 +34,7 @@ import (
 
 var _ = Describe("Docker backend", func() {
 	Context("Simple Docker backend satisfies main interface functionalities", func() {
-		ctx := types.NewContext()
+		ctx := context.NewContext()
 		It("Builds and generate tars", func() {
 			generalRecipe := tree.NewGeneralRecipe(pkg.NewInMemoryDatabase(false))
 

pkg/compiler/backend/simpleimg.go

@@ -28,10 +28,10 @@ import (
 )
 
 type SimpleImg struct {
-	ctx *types.Context
+	ctx types.Context
 }
 
-func NewSimpleImgBackend(ctx *types.Context) *SimpleImg {
+func NewSimpleImgBackend(ctx types.Context) *SimpleImg {
 	return &SimpleImg{ctx: ctx}
 }
 
@@ -77,7 +77,7 @@ func (s *SimpleImg) RemoveImage(opts Options) error {
 
 func (s *SimpleImg) ImageReference(a string, ondisk bool) (v1.Image, error) {
 
-	f, err := s.ctx.Config.GetSystem().TempFile("snapshot")
+	f, err := s.ctx.TempFile("snapshot")
 	if err != nil {
 		return nil, err
 	}

pkg/compiler/backend/writer.go

@@ -25,10 +25,10 @@ import (
 type BackendWriter struct {
 	BufferedOutput bool
 	Buffer         *bytes.Buffer
-	ctx            *types.Context
+	ctx            types.Context
 }
 
-func NewBackendWriter(buffered bool, ctx *types.Context) *BackendWriter {
+func NewBackendWriter(buffered bool, ctx types.Context) *BackendWriter {
 	return &BackendWriter{
 		BufferedOutput: buffered,
 		Buffer:         &bytes.Buffer{},
@@ -41,7 +41,7 @@ func (b *BackendWriter) Write(p []byte) (int, error) {
 		return b.Buffer.Write(p)
 	}
 
-	b.ctx.Msg("info", false, (string(p)))
+	b.ctx.Info((string(p)))
 
 	return len(p), nil
 }