text: /*
   * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *   * Redistributions of source code must retain the above copyright notice,
   *     this list of conditions and the following disclaimer.
   *   * Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *   * Neither the name of Redis nor the names of its contributors may be used
   *     to endorse or promote products derived from this software without
   *     specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  /* Every time the Redis Git SHA1 or Dirty status changes only this small
   * file is recompiled, as we access this information in all the other
   * files using this functions. */
  
  #include <string.h>
  #include <stdio.h>
  
  #include "release.h"
  #include "version.h"
  #include "crc64.h"
  /**
   * 用于发布使用
   * @return
   */
  char *redisGitSHA1(void) {
      return REDIS_GIT_SHA1;
  }
  
  char *redisGitDirty(void) {
      return REDIS_GIT_DIRTY;
  }
  
  uint64_t redisBuildId(void) {
      char *buildid = REDIS_VERSION REDIS_BUILD_ID REDIS_GIT_DIRTY REDIS_GIT_SHA1;
  
      return crc64(0,(unsigned char*)buildid,strlen(buildid));
  }
  
  /* Return a cached value of the build string in order to avoid recomputing
   * and converting it in hex every time: this string is shown in the INFO
   * output that should be fast. */
  char *redisBuildIdString(void) {
      static char buf[32];
      static int cached = 0;
      if (!cached) {
          snprintf(buf,sizeof(buf),"%llx",(unsigned long long) redisBuildId());
          cached = 1;
      }
      return buf;
  }
  