From a3bdc2c2a5dbb6fd7f7f655f6970f7559dca0497 Mon Sep 17 00:00:00 2001
From: Barry Warsaw <barry@python.org>
Date: Sun, 18 Dec 2005 22:46:35 +0000
Subject: [PATCH] Handle a couple of use cases discussed in python-dev w.r.t.
 calculating the Subversion revision number.

First, in an svn export, there will be no .svn directory, so use an in-file
$Revision$ keyword string with the keyword chrome stripped off.

Also, use $(srcdir) in the Makefile.pre.in to handle the case where Python is
build outside the source tree.
---
 Makefile.pre.in        | 15 ++++++++-------
 Modules/getbuildinfo.c | 34 ++++++++++++++++++++++++++--------
 2 files changed, 34 insertions(+), 15 deletions(-)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index 0ce2afa685b..020c86ed39c 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -349,12 +349,9 @@ buildno: $(PARSER_OBJS) \
 		$(SIGNAL_OBJS) \
 		$(MODOBJS) \
 		$(srcdir)/Modules/getbuildinfo.c
-	if test -d .svn; then \
-		svnversion . >buildno; \
-	elif test -f buildno; then \
-		expr `cat buildno` + 1 >buildno1; \
-		mv -f buildno1 buildno; \
-	else echo 1 >buildno; fi
+	if test -d $(srcdir)/.svn; then \
+		svnversion $(srcdir) >buildno; \
+	fi
 
 # Build static library
 # avoid long command lines, same as LIBRARY_OBJS
@@ -446,7 +443,11 @@ Modules/Setup: $(srcdir)/Modules/Setup.dist
 # Special rules for object files
 
 Modules/getbuildinfo.o: $(srcdir)/Modules/getbuildinfo.c buildno
-	$(CC) -c $(PY_CFLAGS) -DBUILD=\"`cat buildno`\" -o $@ $(srcdir)/Modules/getbuildinfo.c
+	if test -f buildno; then \
+		$(CC) -c $(PY_CFLAGS) -DBUILD=\"`cat buildno`\" -o $@ $(srcdir)/Modules/getbuildinfo.c ;\
+	else \
+		$(CC) -c $(PY_CFLAGS) -o $@ $(srcdir)/Modules/getbuildinfo.c ;\
+	fi
 
 Modules/getpath.o: $(srcdir)/Modules/getpath.c Makefile
 	$(CC) -c $(PY_CFLAGS) -DPYTHONPATH='"$(PYTHONPATH)"' \
diff --git a/Modules/getbuildinfo.c b/Modules/getbuildinfo.c
index 8b1ca22f3ab..446340badbf 100644
--- a/Modules/getbuildinfo.c
+++ b/Modules/getbuildinfo.c
@@ -21,20 +21,38 @@
 #endif
 
 #ifndef BUILD
-#define BUILD "0"
+#define BUILD "$Revision$"
 #endif
 
+const char *
+Py_GetBuildNumber(void)
+{
+	static char buildno[20];
+	static int buildno_okay;
+
+	if (!buildno_okay) {
+		char *build = BUILD;
+		int len = strlen(build);
+
+		if (len > 13 &&
+		    !strncmp(build, "$Revision: ", 11) &&
+		    !strcmp(build + len - 2, " $"))
+		{
+			memcpy(buildno, build + 11, len - 13);
+		}
+		else {
+			memcpy(buildno, build, 19);
+		}
+		buildno_okay = 1;
+	}
+	return buildno;
+}
+
 const char *
 Py_GetBuildInfo(void)
 {
 	static char buildinfo[50];
 	PyOS_snprintf(buildinfo, sizeof(buildinfo),
-		      "%s, %.20s, %.9s", BUILD, DATE, TIME);
+		      "#%s, %.20s, %.9s", Py_GetBuildNumber(), DATE, TIME);
 	return buildinfo;
 }
-
-const char *
-Py_GetBuildNumber(void)
-{
-	return BUILD;
-}