Use git's version number for releases.

This will allow more specific version numbers, while simplifying a
proper release down to a tag and make dist.

During development, ./version.sh needs to run periodically to update
the version number.  I'd recommend just adding a call to version.sh as
a git post commit hook:

% cat .git/hooks/post-commit

echo "Updating version."
./version.sh

(and make sure the file is executable)

.gitignore

@@ -33,4 +33,5 @@ memcached-*.tar.gz
 doc/protocol-binary-range.txt
 doc/protocol-binary.txt
 /sizes
-/internal_tests
+/internal_tests
+/version.m4

Makefile.am

@@ -58,7 +58,7 @@ memcached_debug_dtrace.o: $(memcached_debug_OBJECTS)
 
 SUBDIRS = doc
 DIST_DIRS = scripts
-EXTRA_DIST = doc scripts TODO t memcached.spec memcached_dtrace.d
+EXTRA_DIST = doc scripts TODO t memcached.spec memcached_dtrace.d version.m4
 
 MOSTLYCLEANFILES = *.gcov *.gcno *.gcda *.tcov
 

autogen.sh

@@ -7,6 +7,9 @@
 #    apt-get install automake1.7 autoconf
 #
 
+# Get the initial version.
+sh version.sh
+
 echo "aclocal..."
 ACLOCAL=`which aclocal-1.10 || which aclocal-1.9 || which aclocal19 || which aclocal-1.7 || which aclocal17 || which aclocal-1.5 || which aclocal15 || which aclocal || exit 1`
 $ACLOCAL || exit 1

configure.ac

@@ -1,5 +1,6 @@
 AC_PREREQ(2.52)
-AC_INIT(memcached, 1.3.2, brad@danga.com)
+m4_include([version.m4])
+AC_INIT(memcached, VERSION_NUMBER, brad@danga.com)
 AC_CANONICAL_SYSTEM
 AC_CONFIG_SRCDIR(memcached.c)
 AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)

version.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if git describe > version.tmp
+then
+    echo "m4_define([VERSION_NUMBER], [`tr -d '\n' < version.tmp`])" \
+        > version.m4
+fi
+rm version.tmp