From: Ken Raeburn <raeburn@mit.edu>
Date: Tue, 26 Mar 2002 21:27:05 +0000 (+0000)
Subject: * move-if-changed: New script.
X-Git-Tag: krb5-1.3-alpha1~822
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=a8d8f93843c6e0dabbb86639a94dc19d31908e23;p=krb5.git

* move-if-changed: New script.
* post.in (depend-postrecurse): Use it.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@14289 dc483132-0cff-0310-8789-dd5450dbe970
---

diff --git a/src/config/ChangeLog b/src/config/ChangeLog
index 1cd7396d9..c65d72bc1 100644
--- a/src/config/ChangeLog
+++ b/src/config/ChangeLog
@@ -1,3 +1,8 @@
+2002-03-26  Ken Raeburn  <raeburn@mit.edu>
+
+	* move-if-changed: New script.
+	* post.in (depend-postrecurse): Use it.
+
 2002-01-08  Ken Raeburn  <raeburn@mit.edu>
 
 	* shlib.conf: For Linux, always add "-lc" at the end of the link
diff --git a/src/config/move-if-changed b/src/config/move-if-changed
new file mode 100644
index 000000000..21403e129
--- /dev/null
+++ b/src/config/move-if-changed
@@ -0,0 +1,17 @@
+#!/bin/sh
+# Move file 1 to file 2 if they don't already match.
+# Good for "make depend" for example, where it'd be nice to keep the
+# old datestamp.
+if [ $# != 2 ]; then
+  echo 2>&1 usage: $0 newfile oldfilename
+  exit 1
+fi
+#
+if [ ! -r "$2" ]; then
+  exec mv -f "$1" "$2"
+fi
+if cmp "$1" "$2" >/dev/null; then
+  echo "$2 is unchanged"
+  exec rm -f "$1"
+fi
+exec mv -f "$1" "$2"
diff --git a/src/config/post.in b/src/config/post.in
index 35ae07c34..3ca6f0c11 100644
--- a/src/config/post.in
+++ b/src/config/post.in
@@ -41,8 +41,7 @@ depend-postrecurse:: .depend
 		sed -e '/^# +++ Dependency line eater +++/,$$d' \
 			< $(srcdir)/Makefile.in | cat - .depend \
 			> $(srcdir)/Makefile.in.new; \
-	$(MV) $(srcdir)/Makefile.in $(srcdir)/Makefile.in.old; \
-	$(MV) $(srcdir)/Makefile.in.new $(srcdir)/Makefile.in; \
+	$(SRCTOP)/config/move-if-changed $(srcdir)/Makefile.in.new $(srcdir)/Makefile.in ; \
 	else :; fi
 
 depend:: depend-prerecurse depend-recurse depend-postrecurse