解决mac无法通过git rev-list --count HEAD获取版本号问题

之前一直用windows电脑开发，采用git rev-list --count HEAD
获取版本号作为VersionCode来进行编译打包，近期更换mac电脑，gradle报错。

解决路径

static def getGitVersion() {
    return 'git rev-list --count HEAD'.execute().text.trim()
}
def obtainVersionCode = getGitVersion().toInteger()

gradle报NumberFormatException,getGitVersion()是空字符。
cmd运行改为'git rev-list --count HEAD'.execute().err.text.trim()并打印出来

fatal: Not a git repository (or any of the parent directories): 

project的app module下不存在.git文件，于是切换到项目根目录执行cmd

def getGitVersion() {
    def cmd = "git -C ${project.rootDir} rev-list --count HEAD"
    println "git version cmd:" + cmd
    def version = cmd.execute().err.text.trim()
    println "git version:"+version
    return version
}
def obtainVersionCode = getGitVersion().toInteger()

问题得到解决