format/index: sort the Entries before encode

1 files changed, 9 insertions, 0 deletions

diff --git a/plumbing/format/index/encoder.go b/plumbing/format/index/encoder.go
index e5de135..4699d43 100644
--- a/plumbing/format/index/encoder.go
+++ b/plumbing/format/index/encoder.go
@@ -6,6 +6,7 @@ import (
 	"errors"
 	"hash"
 	"io"
+	"sort"
 	"time"
 
 	"srcd.works/go-git.v4/utils/binary"
@@ -61,6 +62,8 @@ func (e *Encoder) encodeHeader(idx *Index) error {
 }
 
 func (e *Encoder) encodeEntries(idx *Index) error {
+	sort.Sort(ByName(idx.Entries))
+
 	for _, entry := range idx.Entries {
 		if err := e.encodeEntry(&entry); err != nil {
 			return err
@@ -139,3 +142,9 @@ func (e *Encoder) padEntry(wrote int) error {
 func (e *Encoder) encodeFooter() error {
 	return binary.Write(e.w, e.hash.Sum(nil))
 }
+
+type ByName []Entry
+
+func (l ByName) Len() int           { return len(l) }
+func (l ByName) Swap(i, j int)      { l[i], l[j] = l[j], l[i] }
+func (l ByName) Less(i, j int) bool { return l[i].Name < l[j].Name }