这个git smudge / clean过滤器有什么问题？ [英] What is wrong with this git smudge/clean filter?

问题描述

我想在我的git存储库中应用这个过滤器，以便在结帐时从解决方案文件中删除一部分，并在提交过程中添加此部分。

这是我想删除或添加：

pre $ code $ GlobalSection（SubversionScc）= preSolution
Svn-Managed = True
经理= AnkhSVN - Subversion支持Visual Studio
EndGlobalSection

.git / info / attributes

lockquote
sln filter = SourceControlProvider

，我已经将这些命令添加到我的配置
$ b $ pre $ git config filter.SourceControlProvider.smudge sed -e'/ GlobalSection（SubversionScc）/，/ EndGlobalSection / d'％
$ git config filter.SourceControlProvider.cleansed -n -e'/ ^ Global $ / r ankhsvnsection'<％

好吧，它不起作用。我做了什么错误？

ankhsvnsection是一个与* .sln文件位于同一目录的文本文件

1. 您有％在这两个过滤器的末尾。
   这没有特别的意义，并将作为额外的参数传递给 sed ，这将可能会产生一个错误（除非你有一个名为％的文件）。
   过滤器应该是streaming（从标准输入读取并写入标准输出）。他们的定义可以包含％f ，但是它不应该被当作一个文件来读写。 Git做这个部分，过滤器应该从标准输入读取并写入标准输出。

你的干净的过滤器试图从％f 。

输入的数据已经在stdin上，不需要重定向。 清洁过滤器中的 sed 程序使用 r 命令访问另一个文件。

过滤器似乎从在工作树，但我不知道这是否有保证。


2. 清洁过滤器中的 sed 命令使用 -n 。它的唯一输出将是 ankhsvnsection 文件的内容（假设输入有一个全局行）。




3. 某些版本的 sed （Mac OS X中至少是（旧）BSD版本）不允许在 r 命令（即清理过滤器的 sed 程序中的 ankhsvnsection 之后的空格）添加，更改或删除过滤器后，您可能需要触摸 ，修改，修改或删除过滤器。 或者在Git应用过滤器之前删除你的工作树文件。 Git的索引记录工作树文件的修改时间;如果它们没有改变，那么Git会把 git checkout -file 和 git add file 转换为no-op 。
   
   

   如果你想查看索引的实际内容（例如检查清理过滤器产生的内容），可以使用 git show： 0：路径/从/回购/根/到/文件。您通常不能使用 git diff ，因为它也应用了过滤器。

   
   
   

   / b>
   
   

     git config filter.SourceControlProvider.smudgesed -e'/ GlobalSection（SubversionScc）/，/ EndGlobalSection / d'
    git config filter.SourceControlProvider.cleansed -e'/ ^ Global \ $ / r ankhsvnsection'
     

   
   

   I want to apply this filter in my git repository to remove a section from a solution file during checkout and to add this section during commit.

   This is the section i want to remove or add:

   GlobalSection(SubversionScc) = preSolution
       Svn-Managed = True
       Manager = AnkhSVN - Subversion Support for Visual Studio
   EndGlobalSection
   

   I have setup this filter in my .git/info/attributes

   *.sln filter=SourceControlProvider

   and i have added these commands to my config

   $ git config filter.SourceControlProvider.smudge "sed -e '/GlobalSection(SubversionScc)/,/EndGlobalSection/d' %"
   $ git config filter.SourceControlProvider.clean "sed -n -e '/^Global$/ r ankhsvnsection ' < %"
   

   Well, it does not work. What have i done wrong?

   ankhsvnsection is a text file that lies in the same directory as the *.sln file

   解决方案

   I see a few issues here:

   1. You have % at the end of both filters.
      This has no special meaning and will be passed as an extra argument to sed, which will probably generate an error (unless you have a file named %).
      Filters should be "streaming" (read from stdin and write to stdout). Their definition can include %f, but it should not really be treated as a file to read or write; Git does that part, filters should just read from stdin and write to stdout.

   2. Your clean filter tries to redirect stdin from %f.
      The input data will already be on stdin, there is no need to redirect.

   3. The sed program in the clean filter uses the r command to access another file.
      Filters seem to be run from root of the working tree, but I am not sure if that is guaranteed.

   4. The sed command in the clean filter uses -n. Its only output will be the contents of the ankhsvnsection file (assuming the input has a Global line).

   5. Some versions of sed (at least the (old) BSD version in Mac OS X) do not allow whitespace after the filename of the r command (i.e. the space after ankhsvnsection in the clean filter’s sed program).

   After adding, changing, or removing a filter you will probably need to touch, modify, or delete your working tree files before Git will apply the filter. Git’s index records the modification time of working tree files; if they have not changed, then Git will translate git checkout -- file and git add file into a no-op.

   If you want to see the actual contents of the index (e.g. to check what the clean filter produced), you can use git show :0:path/from/repo/root/to/file. You can not usually use git diff for this since it also applies the filters.

   These worked for me:

   git config filter.SourceControlProvider.smudge "sed -e '/GlobalSection(SubversionScc)/,/EndGlobalSection/d'"
   git config filter.SourceControlProvider.clean "sed -e '/^Global\$/ r ankhsvnsection'"
   

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