From e7156cfb1df3302c333d9e8add3921f280a3d0e1 Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sun, 14 Jun 2026 01:51:59 +0000
Subject: *: Preallocate slices

---
 internal/format/packidx/write.go               | 2 +-
 internal/testgit/tree.go                       | 2 +-
 object/store/packed/internal/ingest/resolve.go | 2 +-
 object/store/packed/internal/ingest/thin.go    | 2 +-
 object/store/packed/refresh.go                 | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/internal/format/packidx/write.go b/internal/format/packidx/write.go
index d3f22c83..35b2805f 100644
--- a/internal/format/packidx/write.go
+++ b/internal/format/packidx/write.go
@@ -84,7 +84,7 @@ func Write(w io.Writer, objectFormat id.ObjectFormat, entries []Entry, packHash
 		sw.PutUint32(entries[i].CRC32)
 	}
 
-	var largeOffsets []uint64
+	largeOffsets := make([]uint64, 0, len(entries))
 
 	for i := range entries {
 		offset := entries[i].Offset
diff --git a/internal/testgit/tree.go b/internal/testgit/tree.go
index 501c7949..ff9b1918 100644
--- a/internal/testgit/tree.go
+++ b/internal/testgit/tree.go
@@ -50,7 +50,7 @@ func (repo *Repo) LsTree(tb testing.TB, oid id.ObjectID) ([]TreeEntry, error) {
 		return nil, fmt.Errorf("ls-tree: %w", err)
 	}
 
-	var entries []TreeEntry
+	entries := make([]TreeEntry, 0, bytes.Count(stdout, []byte{0}))
 
 	for record := range bytes.SplitSeq(stdout, []byte{0}) {
 		if len(record) == 0 {
diff --git a/object/store/packed/internal/ingest/resolve.go b/object/store/packed/internal/ingest/resolve.go
index 8595d366..77b0fa0f 100644
--- a/object/store/packed/internal/ingest/resolve.go
+++ b/object/store/packed/internal/ingest/resolve.go
@@ -270,7 +270,7 @@ func (ingestion *ingestion) countUnresolved() int {
 func (ingestion *ingestion) unresolvedExternalBases() []id.ObjectID {
 	seen := make(map[id.ObjectID]struct{})
 
-	var out []id.ObjectID
+	out := make([]id.ObjectID, 0, ingestion.deltaCount-ingestion.deltasResolved)
 
 	for index := range ingestion.records {
 		rec := &ingestion.records[index]
diff --git a/object/store/packed/internal/ingest/thin.go b/object/store/packed/internal/ingest/thin.go
index 8d1566e0..fa125f2f 100644
--- a/object/store/packed/internal/ingest/thin.go
+++ b/object/store/packed/internal/ingest/thin.go
@@ -33,7 +33,7 @@ func (ingestion *ingestion) fixThin(external []id.ObjectID, adjacency adjacency,
 	// Drop the trailer from the write cursor.
 	ingestion.scanner.consumed -= hashSize
 
-	var appended []int
+	appended := make([]int, 0, len(external))
 
 	for _, baseOID := range external {
 		ty, content, err := ingestion.opts.ThinBase.ReadBytesContent(baseOID)
diff --git a/object/store/packed/refresh.go b/object/store/packed/refresh.go
index 14c66013..f06e9859 100644
--- a/object/store/packed/refresh.go
+++ b/object/store/packed/refresh.go
@@ -23,7 +23,7 @@ func (packed *Packed) Refresh() error {
 
 	next := make(map[string]*pack, len(packed.byName))
 
-	var opened []*pack
+	opened := make([]*pack, 0, len(dirEntries))
 
 	for _, dirEntry := range dirEntries {
 		name, ok := strings.CutSuffix(dirEntry.Name(), ".idx")
-- 
cgit v1.3.1-10-gc9f91