!11 bugfix: fix the bug of quiting while source file increased

From: @zengwefeng
Reviewed-by: @wangxp006
Signed-off-by: @wangxp006

lftp.spec

@@ -1,7 +1,7 @@
 Summary:	A sophisticated file transfer program
 Name:		lftp
 Version:	4.9.1
-Release:	3
+Release:	4
 License:	GPLv3+
 URL:		http://lftp.yar.ru/
 Source0:        http://lftp.yar.ru/ftp/%{name}-%{version}.tar.xz
@@ -9,7 +9,9 @@ BuildRequires:	ncurses-devel, gnutls-devel, perl-generators, pkgconfig, gettext
 BuildRequires:	gettext readline-devel, zlib-devel, gcc-c++ desktop-file-utils
 BuildRequires:  chrpath
 Requires:       %{name}-help
-Patch1:         lftp-4.0.9-date_fmt.patch
+
+Patch0:         lftp-4.0.9-date_fmt.patch
+Patch1:         quit-while-source-file-increased.patch
 
 %description
 LFTP is a sophisticated file transfer program supporting a number of
@@ -83,6 +85,12 @@ echo "%{_libdir}/lftp/%{version}" > %{buildroot}/etc/ld.so.conf.d/%{name}-%{_arc
 
 
 %changelog
+* Fri Oct 29 2021 zengweifeng <zwfeng@huawei.com> - 4.9.1-4
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:fix bug of quiting while source file increased
+
 * Mon Nov 09 2020 quanhongfei <quanhongfei@huawei.com> - 4.9.1-3
 - Type:requirement
 - ID:NA

quit-while-source-file-increased.patch

@@ -0,0 +1,57 @@
+From 3cabbf03f80e78a69a0b9e797050a1dacf5c26da Mon Sep 17 00:00:00 2001
+From: sherlock2010 <15151851377@163.com>
+Date: Thu, 28 Oct 2021 18:36:53 +0800
+Subject: [PATCH] Quit while source file increased
+
+---
+ src/FileCopy.cc | 7 +++++++
+ src/FileCopy.h  | 1 +
+ 2 files changed, 8 insertions(+)
+
+diff --git a/src/FileCopy.cc b/src/FileCopy.cc
+index ead65a2..361958e 100644
+--- a/src/FileCopy.cc
++++ b/src/FileCopy.cc
+@@ -1137,6 +1137,7 @@ void FileCopyPeerFA::OpenSession()
+ 	 debug((10,"copy dst: seek past eof (seek_pos=%lld, size=%lld)\n",
+ 		  (long long)seek_pos,(long long)e_size));
+ 	 eof=true;
++	 fileincreased=true;
+ 	 if(date==NO_DATE || date==NO_DATE_YET)
+ 	    return;
+       }
+@@ -1284,6 +1285,11 @@ int FileCopyPeerFA::Put_LL(const char *buf,int len)
+    if(session->IsClosed())
+       OpenSession();
+ 
++   if(fileincreased)
++   {
++      SetError(_("file size increased during transfer"));
++      return -1;
++   }
+    off_t io_at=pos; // GetRealPos can alter pos, save it.
+    if(GetRealPos()!=io_at)
+       return 0;
+@@ -1352,6 +1358,7 @@ void FileCopyPeerFA::Init()
+ {
+    get_delay=0;
+    fxp=false;
++   fileincreased=false;
+    redirections=0;
+    can_seek=true;
+    can_seek0=true;
+diff --git a/src/FileCopy.h b/src/FileCopy.h
+index af97880..5a9e4cf 100644
+--- a/src/FileCopy.h
++++ b/src/FileCopy.h
+@@ -335,6 +335,7 @@ class FileCopyPeerFA : public FileCopyPeer
+    FileSet info;
+ 
+    bool fxp;   // FXP (ftp<=>ftp copy) active
++   bool fileincreased;
+ 
+    UploadState upload_state;
+    int redirections;
+-- 
+1.8.3.1
+