From 791b4039e4407c92e267cac3031cf1e8999b5013 Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sat, 28 Mar 2026 20:07:11 +0000
Subject: network/protocol: Flush ChunkWriter properly

---
 network/protocol/pktline/chunk_writer.go           |  5 +++++
 network/protocol/sideband64k/chunk_writer.go       |  5 +++++
 .../protocol/v0v1/server/receivepack/session.go    |  3 +--
 network/protocol/v0v1/server/session.go            | 24 ++++------------------
 4 files changed, 15 insertions(+), 22 deletions(-)

diff --git a/network/protocol/pktline/chunk_writer.go b/network/protocol/pktline/chunk_writer.go
index b258ff20..3e1a8c36 100644
--- a/network/protocol/pktline/chunk_writer.go
+++ b/network/protocol/pktline/chunk_writer.go
@@ -63,3 +63,8 @@ func (cw *ChunkWriter) ReadFrom(r io.Reader) (int64, error) {
 		}
 	}
 }
+
+// Flush flushes buffered output in the underlying transport.
+func (cw *ChunkWriter) Flush() error {
+	return cw.enc.Flush()
+}
diff --git a/network/protocol/sideband64k/chunk_writer.go b/network/protocol/sideband64k/chunk_writer.go
index f95f75d8..9ee4e9f8 100644
--- a/network/protocol/sideband64k/chunk_writer.go
+++ b/network/protocol/sideband64k/chunk_writer.go
@@ -62,3 +62,8 @@ func (cw *ChunkWriter) ReadFrom(r io.Reader) (int64, error) {
 		}
 	}
 }
+
+// Flush flushes buffered output in the underlying transport.
+func (cw *ChunkWriter) Flush() error {
+	return cw.enc.Flush()
+}
diff --git a/network/protocol/v0v1/server/receivepack/session.go b/network/protocol/v0v1/server/receivepack/session.go
index d7b2a7c5..b4902df4 100644
--- a/network/protocol/v0v1/server/receivepack/session.go
+++ b/network/protocol/v0v1/server/receivepack/session.go
@@ -2,7 +2,6 @@ package receivepack
 
 import (
 	"fmt"
-	"io"
 	"strings"
 
 	"codeberg.org/lindenii/furgit/common/iowrap"
@@ -181,7 +180,7 @@ func (session *Session) WriteError(p []byte) error {
 // ErrorWriter returns one chunking writer for sideband error output.
 //
 // When side-band-64k was not negotiated, writes are discarded.
-func (session *Session) ErrorWriter() io.Writer {
+func (session *Session) ErrorWriter() iowrap.WriteFlusher {
 	return session.base.ErrorWriter()
 }
 
diff --git a/network/protocol/v0v1/server/session.go b/network/protocol/v0v1/server/session.go
index 45e14c92..23818014 100644
--- a/network/protocol/v0v1/server/session.go
+++ b/network/protocol/v0v1/server/session.go
@@ -97,19 +97,6 @@ func (session *Session) Flush() error {
 	return session.enc.Flush()
 }
 
-type flushWriter struct {
-	writer io.Writer
-	flush  func() error
-}
-
-func (w flushWriter) Write(p []byte) (int, error) {
-	return w.writer.Write(p)
-}
-
-func (w flushWriter) Flush() error {
-	return w.flush()
-}
-
 // ProgressWriter returns one chunking writer for sideband progress output.
 //
 // When side-band-64k was not negotiated, writes are discarded.
@@ -118,18 +105,15 @@ func (session *Session) ProgressWriter() iowrap.WriteFlusher {
 		return iowrap.NopFlush(io.Discard)
 	}
 
-	return flushWriter{
-		writer: sideband64k.NewChunkWriter(session.sideband, sideband64k.BandProgress),
-		flush:  session.sideband.Flush,
-	}
+	return sideband64k.NewChunkWriter(session.sideband, sideband64k.BandProgress)
 }
 
 // ErrorWriter returns one chunking writer for sideband error output.
 //
 // When side-band-64k was not negotiated, writes are discarded.
-func (session *Session) ErrorWriter() io.Writer {
+func (session *Session) ErrorWriter() iowrap.WriteFlusher {
 	if !session.useSideBand {
-		return io.Discard
+		return iowrap.NopFlush(io.Discard)
 	}
 
 	return sideband64k.NewChunkWriter(session.sideband, sideband64k.BandError)
@@ -139,7 +123,7 @@ func (session *Session) ErrorWriter() io.Writer {
 //
 // When side-band-64k is enabled, writes are chunked into band-1 sideband
 // frames. Otherwise writes are chunked into direct pkt-line data frames.
-func (session *Session) PrimaryDataWriter() io.Writer {
+func (session *Session) PrimaryDataWriter() iowrap.WriteFlusher {
 	if session.useSideBand {
 		return sideband64k.NewChunkWriter(session.sideband, sideband64k.BandData)
 	}
-- 
cgit v1.3.1-10-gc9f91