[rygel] build: Generate ChangeLog from git on make dist

[Jens Georg <jensgeorg src gnome org>]

commit 7a768b620c1889f8e854dbab9320bb9fa9e17c4c
Author: Jens Georg <mail jensge org>
Date:   Sat Apr 16 17:59:09 2011 +0300

    build: Generate ChangeLog from git on make dist

 Makefile.am |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 5df20af..3092a5a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -19,6 +19,18 @@ $(top_srcdir)/.version:
 	echo $(VERSION) > $ -t && mv $ -t $@
 dist-hook:
 	echo $(VERSION) > $(distdir)/.tarball-version
+	@if test -d "$(srcdir)/.git"; \
+		then \
+				echo Creating ChangeLog && \
+				( cd "$(top_srcdir)" && \
+				  echo '# Generated by Makefile. Do not edit.'; echo; \
+				  git log --stat ) > ChangeLog.tmp \
+				&& mv -f ChangeLog.tmp $(distdir)/ChangeLog \
+				|| ( rm -f ChangeLog.tmp ; \
+					 echo Failed to generate ChangeLog >&2 ); \
+		else \
+				echo A git clone is required to generate a ChangeLog >&2; \
+		fi
 
 vala-clean:
 	rm -f `find . -name "*.stamp"`