diff --git a/cmd/srpmproc/fetch.go b/cmd/srpmproc/fetch.go
index f56aced..aeaf01f 100644
--- a/cmd/srpmproc/fetch.go
+++ b/cmd/srpmproc/fetch.go
@@ -23,7 +23,7 @@ package main
 import (
 	"errors"
 	"fmt"
-	"git.rockylinux.org/release-engineering/public/srpmproc/internal"
+	"git.rockylinux.org/release-engineering/public/srpmproc/internal/data"
 	"github.com/spf13/cobra"
 	"io/ioutil"
 	"log"
@@ -113,7 +113,7 @@ func runFetch(_ *cobra.Command, _ []string) {
 			log.Fatalf("could not close body handle: %v", err)
 		}
 
-		hasher := internal.CompareHash(body, hash)
+		hasher := data.CompareHash(body, hash)
 		if hasher == nil {
 			log.Fatal("checksum in metadata does not match dist-git file")
 		}
diff --git a/internal/utils.go b/internal/data/utils.go
similarity index 90%
rename from internal/utils.go
rename to internal/data/utils.go
index d137482..863b88c 100644
--- a/internal/utils.go
+++ b/internal/data/utils.go
@@ -18,7 +18,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-package internal
+package data
 
 import (
 	"crypto/md5"
@@ -26,7 +26,6 @@ import (
 	"crypto/sha256"
 	"crypto/sha512"
 	"encoding/hex"
-	"git.rockylinux.org/release-engineering/public/srpmproc/internal/data"
 	"github.com/go-git/go-billy/v5"
 	"hash"
 	"io"
@@ -35,7 +34,7 @@ import (
 	"path/filepath"
 )
 
-func copyFromFs(from billy.Filesystem, to billy.Filesystem, path string) {
+func CopyFromFs(from billy.Filesystem, to billy.Filesystem, path string) {
 	read, err := from.ReadDir(path)
 	if err != nil {
 		log.Fatalf("could not read dir: %v", err)
@@ -46,7 +45,7 @@ func copyFromFs(from billy.Filesystem, to billy.Filesystem, path string) {
 
 		if fi.IsDir() {
 			_ = to.MkdirAll(fullPath, 0755)
-			copyFromFs(from, to, fullPath)
+			CopyFromFs(from, to, fullPath)
 		} else {
 			_ = to.Remove(fullPath)
 
@@ -68,7 +67,7 @@ func copyFromFs(from billy.Filesystem, to billy.Filesystem, path string) {
 	}
 }
 
-func ignoredContains(a []*data.IgnoredSource, b string) bool {
+func IgnoredContains(a []*IgnoredSource, b string) bool {
 	for _, val := range a {
 		if val.Name == b {
 			return true
@@ -78,7 +77,7 @@ func ignoredContains(a []*data.IgnoredSource, b string) bool {
 	return false
 }
 
-func strContains(a []string, b string) bool {
+func StrContains(a []string, b string) bool {
 	for _, val := range a {
 		if val == b {
 			return true
diff --git a/internal/directives/add.go b/internal/directives/add.go
index 9d79cb2..8934c7b 100644
--- a/internal/directives/add.go
+++ b/internal/directives/add.go
@@ -31,25 +31,55 @@ import (
 	"path/filepath"
 )
 
-func add(cfg *srpmprocpb.Cfg, _ *data.ProcessData, _ *data.ModeData, patchTree *git.Worktree, pushTree *git.Worktree) error {
+// returns right if not empty, else left
+func eitherString(left string, right string) string {
+	if right != "" {
+		return right
+	}
+
+	return left
+}
+
+func add(cfg *srpmprocpb.Cfg, pd *data.ProcessData, md *data.ModeData, patchTree *git.Worktree, pushTree *git.Worktree) error {
 	for _, add := range cfg.Add {
-		filePath := checkAddPrefix(filepath.Base(add.File))
+		var replacingBytes []byte
+		var filePath string
+
+		switch addType := add.Source.(type) {
+		case *srpmprocpb.Add_File:
+			filePath = checkAddPrefix(eitherString(filepath.Base(addType.File), add.Name))
+
+			fPatch, err := patchTree.Filesystem.OpenFile(addType.File, os.O_RDONLY, 0644)
+			if err != nil {
+				return errors.New(fmt.Sprintf("COULD_NOT_OPEN_FROM:%s", addType.File))
+			}
+
+			replacingBytes, err = ioutil.ReadAll(fPatch)
+			if err != nil {
+				return errors.New(fmt.Sprintf("COULD_NOT_READ_FROM:%s", addType.File))
+			}
+			break
+		case *srpmprocpb.Add_Lookaside:
+			filePath = checkAddPrefix(eitherString(filepath.Base(addType.Lookaside), add.Name))
+			replacingBytes = pd.BlobStorage.Read(addType.Lookaside)
+
+			hashFunction := data.CompareHash(replacingBytes, addType.Lookaside)
+			if hashFunction == nil {
+				return errors.New(fmt.Sprintf("LOOKASIDE_HASH_DOES_NOT_MATCH:%s", addType.Lookaside))
+			}
+
+			md.SourcesToIgnore = append(md.SourcesToIgnore, &data.IgnoredSource{
+				Name:         filePath,
+				HashFunction: hashFunction,
+			})
+			break
+		}
 
 		f, err := pushTree.Filesystem.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
 		if err != nil {
 			return errors.New(fmt.Sprintf("COULD_NOT_OPEN_DESTINATION:%s", filePath))
 		}
 
-		fPatch, err := patchTree.Filesystem.OpenFile(add.File, os.O_RDONLY, 0644)
-		if err != nil {
-			return errors.New(fmt.Sprintf("COULD_NOT_OPEN_FROM:%s", add.File))
-		}
-
-		replacingBytes, err := ioutil.ReadAll(fPatch)
-		if err != nil {
-			return errors.New(fmt.Sprintf("COULD_NOT_READ_FROM:%s", add.File))
-		}
-
 		_, err = f.Write(replacingBytes)
 		if err != nil {
 			return errors.New(fmt.Sprintf("COULD_NOT_WRITE_DESTIONATION:%s", filePath))
diff --git a/internal/directives/replace.go b/internal/directives/replace.go
index 3cdf083..cf2a7ea 100644
--- a/internal/directives/replace.go
+++ b/internal/directives/replace.go
@@ -30,7 +30,7 @@ import (
 	"os"
 )
 
-func replace(cfg *srpmprocpb.Cfg, _ *data.ProcessData, _ *data.ModeData, patchTree *git.Worktree, pushTree *git.Worktree) error {
+func replace(cfg *srpmprocpb.Cfg, pd *data.ProcessData, _ *data.ModeData, patchTree *git.Worktree, pushTree *git.Worktree) error {
 	for _, replace := range cfg.Replace {
 		filePath := checkAddPrefix(replace.File)
 		stat, err := pushTree.Filesystem.Stat(filePath)
@@ -71,6 +71,18 @@ func replace(cfg *srpmprocpb.Cfg, _ *data.ProcessData, _ *data.ModeData, patchTr
 				return errors.New(fmt.Sprintf("COULD_NOT_WRITE_INLINE:%s", filePath))
 			}
 			break
+		case *srpmprocpb.Replace_WithLookaside:
+			bts := pd.BlobStorage.Read(replacing.WithLookaside)
+			hasher := data.CompareHash(bts, replacing.WithLookaside)
+			if hasher == nil {
+				return errors.New("LOOKASIDE_FILE_AND_HASH_NOT_MATCHING")
+			}
+
+			_, err := f.Write(bts)
+			if err != nil {
+				return errors.New(fmt.Sprintf("COULD_NOT_WRITE_LOOKASIDE:%s", filePath))
+			}
+			break
 		}
 	}
 
diff --git a/internal/git.go b/internal/git.go
index 89e8ce8..81689fb 100644
--- a/internal/git.go
+++ b/internal/git.go
@@ -273,7 +273,7 @@ func (g *GitMode) WriteSource(pd *data.ProcessData, md *data.ModeData) {
 			log.Fatalf("could not open file pointer: %v", err)
 		}
 
-		hasher := CompareHash(body, hash)
+		hasher := data.CompareHash(body, hash)
 		if hasher == nil {
 			log.Fatal("checksum in metadata does not match dist-git file")
 		}
diff --git a/internal/process.go b/internal/process.go
index a9742ef..5658a05 100644
--- a/internal/process.go
+++ b/internal/process.go
@@ -225,7 +225,7 @@ func ProcessRPM(pd *data.ProcessData) {
 
 		pd.Importer.WriteSource(pd, md)
 
-		copyFromFs(md.Worktree.Filesystem, w.Filesystem, ".")
+		data.CopyFromFs(md.Worktree.Filesystem, w.Filesystem, ".")
 		md.Repo = repo
 		md.Worktree = w
 
@@ -270,7 +270,7 @@ func ProcessRPM(pd *data.ProcessData) {
 				log.Fatalf("could not write to metadata file: %v", err)
 			}
 
-			if strContains(alreadyUploadedBlobs, checksum) {
+			if data.StrContains(alreadyUploadedBlobs, checksum) {
 				continue
 			}
 			if !pd.BlobStorage.Exists(checksum) && !pd.NoStorageUpload {
diff --git a/internal/srpm.go b/internal/srpm.go
index 2287451..02aa9a9 100644
--- a/internal/srpm.go
+++ b/internal/srpm.go
@@ -151,7 +151,7 @@ func (s *SrpmMode) WriteSource(_ *data.ProcessData, md *data.ModeData) {
 		_ = f.Close()
 
 		// don't add ignored file to git
-		if ignoredContains(md.SourcesToIgnore, fileName) {
+		if data.IgnoredContains(md.SourcesToIgnore, fileName) {
 			continue
 		}
 
diff --git a/pb/cfg.pb.go b/pb/cfg.pb.go
index 3b57da8..0a7181b 100644
--- a/pb/cfg.pb.go
+++ b/pb/cfg.pb.go
@@ -87,6 +87,7 @@ type Replace struct {
 	// Types that are assignable to Replacing:
 	//	*Replace_WithFile
 	//	*Replace_WithInline
+	//	*Replace_WithLookaside
 	Replacing isReplace_Replacing `protobuf_oneof:"replacing"`
 }
 
@@ -150,6 +151,13 @@ func (x *Replace) GetWithInline() string {
 	return ""
 }
 
+func (x *Replace) GetWithLookaside() string {
+	if x, ok := x.GetReplacing().(*Replace_WithLookaside); ok {
+		return x.WithLookaside
+	}
+	return ""
+}
+
 type isReplace_Replacing interface {
 	isReplace_Replacing()
 }
@@ -164,10 +172,17 @@ type Replace_WithInline struct {
 	WithInline string `protobuf:"bytes,3,opt,name=with_inline,json=withInline,proto3,oneof"`
 }
 
+type Replace_WithLookaside struct {
+	// Replace with lookaside cache object
+	WithLookaside string `protobuf:"bytes,4,opt,name=with_lookaside,json=withLookaside,proto3,oneof"`
+}
+
 func (*Replace_WithFile) isReplace_Replacing() {}
 
 func (*Replace_WithInline) isReplace_Replacing() {}
 
+func (*Replace_WithLookaside) isReplace_Replacing() {}
+
 // Delete directive deletes literal files from the rpm repository.
 // Won't delete from spec automatically.
 // Use the `SpecChange` directive for that
@@ -229,9 +244,13 @@ type Add struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Required - file to add
-	File string `protobuf:"bytes,1,opt,name=file,proto3" json:"file,omitempty"`
+	//
+	// Types that are assignable to Source:
+	//	*Add_File
+	//	*Add_Lookaside
+	Source isAdd_Source `protobuf_oneof:"source"`
 	// Overrides file name if specified
-	Name string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+	Name string `protobuf:"bytes,3,opt,name=name,proto3" json:"name,omitempty"`
 }
 
 func (x *Add) Reset() {
@@ -266,13 +285,27 @@ func (*Add) Descriptor() ([]byte, []int) {
 	return file_cfg_proto_rawDescGZIP(), []int{2}
 }
 
+func (m *Add) GetSource() isAdd_Source {
+	if m != nil {
+		return m.Source
+	}
+	return nil
+}
+
 func (x *Add) GetFile() string {
-	if x != nil {
+	if x, ok := x.GetSource().(*Add_File); ok {
 		return x.File
 	}
 	return ""
 }
 
+func (x *Add) GetLookaside() string {
+	if x, ok := x.GetSource().(*Add_Lookaside); ok {
+		return x.Lookaside
+	}
+	return ""
+}
+
 func (x *Add) GetName() string {
 	if x != nil {
 		return x.Name
@@ -280,6 +313,22 @@ func (x *Add) GetName() string {
 	return ""
 }
 
+type isAdd_Source interface {
+	isAdd_Source()
+}
+
+type Add_File struct {
+	File string `protobuf:"bytes,1,opt,name=file,proto3,oneof"`
+}
+
+type Add_Lookaside struct {
+	Lookaside string `protobuf:"bytes,2,opt,name=lookaside,proto3,oneof"`
+}
+
+func (*Add_File) isAdd_Source() {}
+
+func (*Add_Lookaside) isAdd_Source() {}
+
 // Lookaside directive puts patched files in blob storage.
 // If tar is true, the files will be put into a tarball and gzipped
 type Lookaside struct {
@@ -1031,119 +1080,124 @@ var File_cfg_proto protoreflect.FileDescriptor
 
 var file_cfg_proto_rawDesc = []byte{
 	0x0a, 0x09, 0x63, 0x66, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x08, 0x73, 0x72, 0x70,
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 }
 
 var (
@@ -1349,6 +1403,11 @@ func file_cfg_proto_init() {
 	file_cfg_proto_msgTypes[0].OneofWrappers = []interface{}{
 		(*Replace_WithFile)(nil),
 		(*Replace_WithInline)(nil),
+		(*Replace_WithLookaside)(nil),
+	}
+	file_cfg_proto_msgTypes[2].OneofWrappers = []interface{}{
+		(*Add_File)(nil),
+		(*Add_Lookaside)(nil),
 	}
 	file_cfg_proto_msgTypes[7].OneofWrappers = []interface{}{
 		(*SpecChange_FileOperation_Add)(nil),
diff --git a/proto/cfg.proto b/proto/cfg.proto
index df4a5ea..05bc4d6 100644
--- a/proto/cfg.proto
+++ b/proto/cfg.proto
@@ -17,6 +17,9 @@ message Replace {
 
     // Replace with inline content
     string with_inline = 3;
+
+    // Replace with lookaside cache object
+    string with_lookaside = 4;
   }
 }
 
@@ -34,10 +37,13 @@ message Delete {
 // Use the `SpecChange` directive for that
 message Add {
   // Required - file to add
-  string file = 1;
+  oneof source {
+    string file = 1;
+    string lookaside = 2;
+  }
 
   // Overrides file name if specified
-  string name = 2;
+  string name = 3;
 }
 
 // Lookaside directive puts patched files in blob storage.