查找返回“发现:.:权限被拒绝"，但我未在其中搜索 [英] Find is returning "find: .: Permission denied", but I am not searching in

问题描述

我有一个正在解决的庞大的Shell脚本.我经常使用sudo从主目录运行脚本.每当执行find时，都会看到此错误:

I have an enormous shell script that I am troubleshooting. I often run the script from my home directory with a sudo. Whenever a find is executed, I see this error:

find: .: Permission denied

的确，root用户无权访问我的主目录(这是当前工作目录或上述错误中的.)，但我没有要求find在我的主目录中执行任何操作，并且宁愿将它完全留下来.

It is true that root does not have access to my home directory (which is the current working directory or . in the error above), but I'm not asking find to do anything in my home directory and would rather it leave it alone entirely.

要真正把这点讲清楚，我跑了这个:

To really drive the point home I ran this:

sudo find /dev -maxdepth 1 -type f

，仍然出现相同的错误.如果-type -f被删除，则错误将附加到预期结果的末尾.当然，如果我cd /dev则没有错误..可能是因为root可以访问/dev.即使我不认为这会引起问题，也使脚本看起来有问题.如何防止脚本显示这些错误?

and still get the same error. If the -type -f is removed the error is appended to the end of the expected results. Of course, if I cd /dev there is no error..probably since root has access to /dev. Even though I don't think it's causing problems, it makes the script look buggy. How can I prevent the script from showing these errors?

推荐答案

我跑了:

strace find /dev -maxdepth 1

在GNU/Linux(Ubuntu)上，事实证明find使用fchdir syscall遍历目录树，最后执行fchdir返回原始工作目录.这是一个片段:

on GNU/Linux (Ubuntu) and it turns out that find uses fchdir syscall to traverse the directory tree and finally executes fchdir to go back to the original working directory. Here's a snippet:

open(".", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW) = 4
fchdir(4)                               = 0

... irrelevant ...

write(1, "/dev\n", 5)                   = 5
open("/dev", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 5
fcntl64(5, F_GETFD)                     = 0x1 (flags FD_CLOEXEC)
fchdir(5)                               = 0

... potentially more fchdirs ...

fchdir(4)                               = 0
close(4)                                = 0

我的提示? cd /tmp(或其他完全可访问的目录)，然后再运行find.

My hint? cd /tmp (or some other fully accessible directory) before running find.

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