Bash: No such file or directory?

问题:

I try to use an executable script (wkhtmltopdf) on a Linux shared webserver (Debian, 64bit). I am pretty sure that I compiled everything correct, but whenever I want to execute the file I get as an response :

> ./wkhtmltopdf -H
-bash: ./wkhtmltopdf: No such file or directory

To be sure that the file is there, here the ls output :

> ls
wkhtmltoimage  wkhtmltopdf

Furthermore I tested the file command on it, which outputs the following :

> file wkhtmltopdf
wkhtmltopdf: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped

My question is now :

Why does bash tells me that there is no 'file or directory', when there obviously is one?

My first guess would be that the shared server does not allow to execute binary files? But shouldn't it then be a problem of permissions, with a different bash output?

Edit :

> id 
uid=2725674(p8907906) gid=600(ftpusers) groups=600(ftpusers)

> ls -l wkhtmltopdf
-rwxrwxrwx 1 p8907906 ftpusers 39745960 Jan 20 09:33 wkhtmltopdf

> ls -ld
drwx---r-x 2 p8907906 ftpusers 44 Jan 28 21:02 .

回答1:

I bet you miss dynamic linker. Just do a

readelf --all ./wkhtmltopdf | grep interpreter

You should get an output like this:

[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]

There are high chances that you system lacks the interpreter (/lib64/ld-linux-x86-64.so.2 in the example). In this case bash would yell No such file or directory, just like when the binary itself is missing.

You can try to use a different linker. Sometime you can succeed. Just do a:

/path/to/the/linker /path/to/your/executable

This command:

find /lib* -name ld-linux\*

will help you find the linkers on your system. Or you can do the readelf command on some command that does run. It will show you correct, working linker.

OR, since you are running Debian system, just do a

sudo apt-get install wkhtmltopdf

to install native version of the tool :)

回答2:

In my case

$ readelf --all ./wkhtmltopdf | grep interpreter
      [Requesting program interpreter: /lib/ld-linux.so.2]

On a machine where the executable was working:

$ ls -lah /lib/ld-linux.so.2
lrwxrwxrwx 1 root root 25 Apr 16  2018 /lib/ld-linux.so.2 -> i386-linux-gnu/ld-2.27.so
$ dpkg -S /lib/ld-linux.so.2  # -S, --search filename-search-pattern: Search for a filename from installed packages.
libc6:i386: /lib/ld-linux.so.2

So to fix the problem (reference)

sudo dpkg --add-architecture i386
sudo apt update
sudo apt install libc6:i386  # GNU C Library: Shared libraries (from apt show)