在源码编译时加入git版本

摘自Redis源码：

 

in Makefile

release_hdr := $(shell sh -c './mkreleasehdr.sh')

 in mkreleasehdr.sh

#!/bin/sh
GIT_SHA1=`(git show-ref --head --hash=8 2> /dev/null || echo 00000000) | head -n1`
GIT_DIRTY=`git diff --no-ext-diff 2> /dev/null | wc -l`
test -f release.h || touch release.h
(cat release.h | grep SHA1 | grep $GIT_SHA1) && \
(cat release.h | grep DIRTY | grep $GIT_DIRTY) && exit 0 # Already uptodate
echo "#define REDIS_GIT_SHA1 \"$GIT_SHA1\"" > release.h
echo "#define REDIS_GIT_DIRTY \"$GIT_DIRTY\"" >> release.h
touch release.c # Force recompile of release.c

in release.c

/* Every time the Redis Git SHA1 or Dirty status changes only this file
* small file is recompiled, as we access this information in all the other
* files using this functions. */

#include "release.h"

char *redisGitSHA1(void) {
return REDIS_GIT_SHA1;
}

char *redisGitDirty(void) {
return REDIS_GIT_DIRTY;
}