符号链接循环中意外的bash自动完成行为 [英] Unexpected bash autocompletion behavior within a symbolic link loop

问题描述

我有以下的目录结构：

 底座/
  DIR /
    子目录/
    链接 - ＆GT; ../dir
 

现在，如果我cd到目录/链接，然后键入：

  CD ../subd[tab]
 

我得到：

  CD ../subdir[space]
 

1. 如果自动完成失败（因为它会推崇的路径和调查的基础/我会听不懂DIR /).




2. 我也明白，如果它要自动填充 CD ../子目录/ 的结局/（因为这会间preT .. 为进入上一层并搜索到DIR /).

但我不明白，实际的行为是介于两者之间。理想情况下，我想的bash表现得像2.（自动完成到CD ../subdir/）。我使用的Fedora 14，bash的版本4.1.7（1）。任何想法如何做到这一点？

解决方案

挖源$ C ​​$ C位后，看起来这是一个有点复杂。实际的问题是bash的允许工作目录中的符号链接（见PWD -L和pwd -P）之间的混合，如果它不是一个物理目录的ReadLine无法确定匹配的类型

在的readline / complete.c：1694

  S =（nontrivial_match＆安培;＆安培; rl_completion_mark_symlink_dirs == 0）
？ LSTAT（文件名，和放大器; finfo）
：STAT（文件名，和放大器; finfo）;
 

统计（）将失败，因为../被理解为相对于该物理路径，而不是逻辑路径。的readline未能确定这是一个目录，因此，不追加最终'/'。
一个非常类似的问题被描述这里

所以我想我可以用现有的行为活现在...

I have the following directory structure:

base/
  dir/
    subdir/
    link -> ../dir

Now if I cd to dir/link and type:

cd ../subd[tab]

I get:

cd ../subdir[space] 

1. I would understand if autocomplete fails (because it would canonize the path and look into base/ and not dir/).

2. I would also understand if it autocompletes to cd ../subdir/ with the ending / (because it would interpret .. as go up one level and search into dir/).

But I do not understand the actual behaviour that is somewhere between the two. Ideally I would like bash to behave like 2. (autocomplete to cd ../subdir/). I am using fedora 14, bash version 4.1.7(1). Any idea how to accomplish this ?

解决方案

After digging the source code a bit, it looks like this is a bit complicated. The actual problem is a mix between bash allowing symlinks inside the working directory (see pwd -L and pwd -P) and readline not able to determine the type of a match if it is not in a physical directory

In readline/complete.c:1694

s = (nontrivial_match && rl_completion_mark_symlink_dirs == 0)
? LSTAT (filename, &finfo)
: stat (filename, &finfo);

stat() fails since ../ is understood as relative to the physical path and not the logical path. readline fails to determine this is a directory and therefore does not append the final '/'. A very similar problem is described here

So I guess I can live with the existing behaviour for now...

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