是否有可能检测一个http git remote是否聪明或愚蠢？ [英] Is it possible to detect whether a http git remote is smart or dumb?

问题描述

我在应用程序中使用 - 深度1 来实现git仓库的最小功能克隆，并且我刚刚意识到愚蠢的http传输不支持 - 深度。我想自动检测一个http远程是愚蠢的还是聪明的，所以我可以省略 - 深度选项，当与愚蠢的http repos交谈时。这是否可能？

或者，有没有直接的方法来检查一个git远程是否支持 - depth ？

解决方案

一种方法是通过直接的HTTP查询。支持git客户端添加一个参数到第一个URL抓取的末尾，[repo] / info / refs？service = git-upload-pack。愚蠢的服务器只会发送info / refs文件作为忽略参数的文本，而智能服务器会在refs列表前返回一些二进制数据，包括文本service = git-upload-pack和一个特性列表（您可以从中找出深度支持）。

您可以使用wget或curl检查MIME类型来编写此智能/哑测试脚本： text / plain（dumb）vs. application / x-git-upload-pack-advertisement（smart）。

  $ curl  - si http://github.com/git/git.git/info/refs?service=git-upload-pack | grep --binary-files = text'^ Content-Type'
 Content-Type：application / x-git-upload-pack-advertisement 
 $ curl -si http://git.kernel.org /pub/scm/git/git.git/info/refs?service=git-upload-pack | grep --binary-files = text'^ Content-Type'
 Content-Type：application / x-git-upload-pack-advertisement 
 $ curl -si http://repo.or.cz /r/git.git/info/refs?service=git-upload-pack | grep --binary-files = text'^ Content-Type'
 Content-Type：text / plain 
  

（管道到 grep -q^ Content-Type：application / x-git并使用返回代码进行真/假测试。）

I'm implementing an option in my application to use --depth 1 to make a minimal functional clone of a git repo, and I've just realized that the dumb http transport doesn't support --depth. I'd like to automatically detect whether an http remote is dumb or smart so I can omit the --depth option when talking to dumb http repos. Is this possible?

Alternately, is there a direct way to check whether a git remote supports --depth?

解决方案

One way is by direct HTTP queries.

Smart-supporting git clients add an argument to the end of the first URL grabbed, "[repo]/info/refs?service=git-upload-pack". A dumb server will just send "info/refs" file as text ignoring the argument, while a smart server will return some binary data in front of the refs list, including text "service=git-upload-pack" and a list of features (which you might be able to figure out "depth" support from).

You can script this smart/dumb test by using wget or curl to check the MIME type: text/plain (dumb) vs. application/x-git-upload-pack-advertisement (smart).

$ curl -si http://github.com/git/git.git/info/refs?service=git-upload-pack | grep --binary-files=text '^Content-Type'
Content-Type: application/x-git-upload-pack-advertisement
$ curl -si http://git.kernel.org/pub/scm/git/git.git/info/refs?service=git-upload-pack | grep --binary-files=text '^Content-Type'
Content-Type: application/x-git-upload-pack-advertisement
$ curl -si http://repo.or.cz/r/git.git/info/refs?service=git-upload-pack | grep --binary-files=text '^Content-Type'
Content-Type: text/plain

(Pipe to grep -q "^Content-Type: application/x-git" and use the return code for true/false test.)

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