git rev-parse是做什么的？ [英] What does git rev-parse do?

问题描述

git rev-parse 做了什么？

我已阅读手册页，但它提出了更多问题比答案。例如：

选取和按摩参数

按摩？这意味着什么？

我用作解析器（对SHA1）修订说明符，如

 git rev-parse HEAD ^ 
  

或

  git rev-parse origin / master 
  

这是命令的目的吗？如果没有，甚至正确地使用它来实现这一目标？ 解决方案

git rev-parse 是一个辅助管道 code> git rev-parse 一个常用的用法是打印SHA1哈希给出了修订说明符。此外，它还有多种选项来格式化输出，如 - short 用于打印较短的唯一SHA1。

还有其他的用例（在git之上构建的脚本和其他工具中），我用它：

• - verify 来验证指定的对象是否为有效的git对象。


• - git-dir 用于显示 .git 目录的绝对/相对路径。 检查您目前是否正在使用 - is-inside-git-dir 或者在使用的工作树内的仓库中 - is-inside-work-tree code>


• 使用检查回购是否为空 - is-bare-repository


• 打印SHA1哈希分支（ - 分支），标签（ - tags ）和refs也可以基于远程过滤（使用 - remote ）


• - parse-opt 标准化脚本中的参数（类似于 getopt ）并打印一个输出字符串，可以使用 eval

按摩只是意味着可以将信息从一种形式转换为另一种形式，即转换命令。这些是我能想到的一些快速示例：

• 分支或标记名称到提交的SHA1指向的位置，以便它可以传递给只接受提交的SHA1值的管道命令。
  
• 修订范围 A..B 代表 git log 或 git diff 作为底层管道命令的等价参数，如 B ^ A

What does git rev-parse do?

I have read the man page but it raised more questions than answers. Things like:

Pick out and massage parameters

Massage? What does that mean?

I'm using as a resolver (to SHA1) of revision specifiers, like

git rev-parse HEAD^

or

git rev-parse origin/master

Is this the command’s purpose? If not, is even correct to use it to achieve this?

解决方案

git rev-parse is an ancillary plumbing command primarily used for manipulation.

One common usage of git rev-parse is to print the SHA1 hashes given a revision specifier. In addition, it has various options to format this output such as --short for printing a shorter unique SHA1.

There are other use cases as well (in scripts and other tools built on top of git) that I've used for:

• --verify to verify that the specified object is a valid git object.
• --git-dir for displaying the abs/relative path of the the .git directory.
• Checking if you're currently within a repository using --is-inside-git-dir or within a work-tree using --is-inside-work-tree
• Checking if the repo is a bare using --is-bare-repository
• Printing SHA1 hashes of branches (--branches), tags (--tags) and the refs can also be filtered based on the remote (using --remote)
• --parse-opt to normalize arguments in a script (kind of similar to getopt) and print an output string that can be used with eval

Massage just implies that it is possible to convert the info from one form into another i.e. a transformation command. These are some quick examples I can think of:

• a branch or tag name into the commit's SHA1 it is pointing to so that it can be passed to a plumbing command which only accepts SHA1 values for the commit.
• a revision range A..B for git log or git diff into the equivalent arguments for the underlying plumbing command as B ^A

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