From d38e6e0cf5a9790f4e774f6900c4b02a62e9e034 Mon Sep 17 00:00:00 2001
From: n-peugnet <n.peugnet@free.fr>
Date: Wed, 13 Oct 2021 15:42:17 +0200
Subject: try to make loadDeltas more robust aginst code change

---
 repo/repo.go                            |  24 +++++++-----------------
 repo/testdata/repo_8k_zlib/00000/files  | Bin 114 -> 169 bytes
 repo/testdata/repo_8k_zlib/00000/hashes | Bin 570 -> 570 bytes
 repo/testdata/repo_8k_zlib/00000/recipe | Bin 2084 -> 2095 bytes
 4 files changed, 7 insertions(+), 17 deletions(-)

diff --git a/repo/repo.go b/repo/repo.go
index 27df54e..b8c07f2 100644
--- a/repo/repo.go
+++ b/repo/repo.go
@@ -337,14 +337,7 @@ func storeDelta(prevRaw []byte, curr interface{}, dest string, differ delta.Diff
 	var encoder *gob.Encoder
 	var err error
 
-	if len(prevRaw) == 0 {
-		encoder = gob.NewEncoder(&prevBuff)
-		if err = encoder.EncodeValue(reflect.ValueOf(curr)); err != nil {
-			logger.Panic(err)
-		}
-	} else {
-		prevBuff = *bytes.NewBuffer(prevRaw)
-	}
+	prevBuff = *bytes.NewBuffer(prevRaw)
 	encoder = gob.NewEncoder(&currBuff)
 	if err = encoder.Encode(curr); err != nil {
 		logger.Panic(err)
@@ -366,16 +359,10 @@ func storeDelta(prevRaw []byte, curr interface{}, dest string, differ delta.Diff
 	}
 }
 
-func loadDeltas(target interface{}, versions []string, patcher delta.Patcher, wrapper utils.ReadWrapper, name string) []byte {
+func loadDeltas(target interface{}, versions []string, patcher delta.Patcher, wrapper utils.ReadWrapper, name string) (ret []byte) {
 	var prev bytes.Buffer
-	var encoder *gob.Encoder
 	var err error
 
-	encoder = gob.NewEncoder(&prev)
-	if err = encoder.Encode(target); err != nil {
-		logger.Panic(err)
-	}
-
 	for _, v := range versions {
 		var curr bytes.Buffer
 		path := filepath.Join(v, name)
@@ -398,12 +385,15 @@ func loadDeltas(target interface{}, versions []string, patcher delta.Patcher, wr
 			logger.Panic(err)
 		}
 	}
-	ret := prev.Bytes()
+	ret = prev.Bytes()
+	if len(ret) == 0 {
+		return
+	}
 	decoder := gob.NewDecoder(&prev)
 	if err = decoder.Decode(target); err != nil {
 		logger.Panic(err)
 	}
-	return ret
+	return
 }
 
 // storeFileList stores the given list in the repo dir as a delta against the
diff --git a/repo/testdata/repo_8k_zlib/00000/files b/repo/testdata/repo_8k_zlib/00000/files
index e9bb403..98a7a44 100644
Binary files a/repo/testdata/repo_8k_zlib/00000/files and b/repo/testdata/repo_8k_zlib/00000/files differ
diff --git a/repo/testdata/repo_8k_zlib/00000/hashes b/repo/testdata/repo_8k_zlib/00000/hashes
index 8c6a857..ec622b2 100644
Binary files a/repo/testdata/repo_8k_zlib/00000/hashes and b/repo/testdata/repo_8k_zlib/00000/hashes differ
diff --git a/repo/testdata/repo_8k_zlib/00000/recipe b/repo/testdata/repo_8k_zlib/00000/recipe
index 7d33a6a..ef8e6d1 100644
Binary files a/repo/testdata/repo_8k_zlib/00000/recipe and b/repo/testdata/repo_8k_zlib/00000/recipe differ
-- 
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