From 52adbbf2c17fe0a3c48e43b4da447627517c531b Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Fri, 11 Aug 2006 17:28:59 +0000
Subject: [PATCH] Restore the old COPYING and INSTALL files after they are
 overwritten by autoreconf -i -f.

---
 autogen.sh | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/autogen.sh b/autogen.sh
index 3b1fdfc6..0fc93302 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,5 +1,31 @@
 #!/bin/sh
 
-autoreconf -i -f &&
-./configure --enable-maintainer-mode $*
+# function saves 'COPYING' and 'INSTALL' as they get clobbered.
+save () {
+	COPYING_ok=false
+	INSTALL_ok=false
+	cp COPYING COPYING.save && COPYING_ok=true
+	cp INSTALL INSTALL.save && INSTALL_ok=true
+}
+
+# function restores 'COPYING' and 'INSTALL' which have probably been clobbered.
+restore () {
+	$COPYING_ok && mv COPYING.save COPYING
+	$INSTALL_ok && mv INSTALL.save INSTALL
+}
+
+# save the files before they get clobbered.
+save
+trap "restore; exit 130" 1 2 15
+
+# run autoreconf. The -i and -f flags causes files to be overwritten.
+autoreconf_ok=false
+autoreconf -i -f && autoreconf_ok=true
+
+# unclobber the overwritten files.
+restore
+trap - 1 2 15
+
+# re-run configure script if autoreconf was successful.
+$autoreconf_ok && ./configure --enable-maintainer-mode $*
 
-- 
2.26.2