Makefile: use git-describe to mark the git version.

Note: with this commit, the GIT maintainer workflow must change.
GIT-VERSION-GEN is now the file to munge when the default
version needs to be changed, not Makefile.  The tag needs to be
pushed into the repository to build the official tarball and
binary package beforehand.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/.gitignore b/.gitignore
index 6bd508e..47d76f4 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+GIT-VERSION-FILE
 git
 git-add
 git-am

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
new file mode 100755 (executable)
index 0000000..196402c
--- /dev/null
+++ b/GIT-VERSION-GEN
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+GVF=GIT-VERSION-FILE
+
+VN=$(git describe --abbrev=4 HEAD 2>/dev/null) || VN=v1.0.GIT
+VN=$(expr "$VN" : v'\(.*\)')
+if test -r $GVF
+then
+       VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)
+else
+       VC=unset
+fi
+test "$VN" = "$VC" || {
+       echo >&2 "GIT_VERSION = $VN"
+       echo "GIT_VERSION = $VN" >$GVF
+}
+
+

diff --git a/Makefile b/Makefile
index 47e7898..1b6caf8 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -55,7 +55,9 @@ all:
 # Define USE_STDEV below if you want git to care about the underlying device
 # change being considered an inode change from the update-cache perspective.
 
-GIT_VERSION = 1.0.GIT
+GIT-VERSION-FILE: .FORCE-GIT-VERSION-FILE
+       @sh ./GIT-VERSION-GEN
+-include GIT-VERSION-FILE
 
 # CFLAGS and LDFLAGS are for the users to override from the command line.
 
@@ -369,7 +371,7 @@ all: $(ALL_PROGRAMS)
 all:
        $(MAKE) -C templates
 
-git$X: git.c $(LIB_FILE) Makefile
+git$X: git.c $(LIB_FILE)
        $(CC) -DGIT_EXEC_PATH='"$(bindir)"' -DGIT_VERSION='"$(GIT_VERSION)"' \
                $(CFLAGS) $(COMPAT_CFLAGS) -o $@ $(filter %.c,$^) $(LIB_FILE)
 
@@ -398,8 +400,12 @@ $(patsubst %.py,%,$(SCRIPT_PYTHON)) : % : %.py
 git-cherry-pick: git-revert
        cp $< $@
 
-# format-patch records GIT_VERSION
-git-format-patch: Makefile
+# These can record GIT_VERSION
+git$X git.spec \
+       $(patsubst %.sh,%,$(SCRIPT_SH)) \
+       $(patsubst %.perl,%,$(SCRIPT_PERL)) \
+       $(patsubst %.py,%,$(SCRIPT_PYTHON)) \
+       : GIT-VERSION-FILE
 
 %.o: %.c
        $(CC) -o $*.o -c $(ALL_CFLAGS) $<
@@ -475,7 +481,7 @@ install-doc:
 
 ### Maintainer's dist rules
 
-git.spec: git.spec.in Makefile
+git.spec: git.spec.in
        sed -e 's/@@VERSION@@/$(GIT_VERSION)/g' < $< > $@
 
 GIT_TARNAME=git-$(GIT_VERSION)
@@ -510,4 +516,8 @@ clean:
        $(MAKE) -C Documentation/ clean
        $(MAKE) -C templates clean
        $(MAKE) -C t/ clean
+       rm -f GIT-VERSION-FILE
+
+.PHONY: all install clean
+.PHONY: .FORCE-GIT-VERSION-FILE