如何在 virtualenv 中使用 gdb python 调试扩展
问题描述
我正在运行 ubuntu，并安装了 python-dbg 包.尝试直接使用已安装的版本时，一切正常:
I'm running ubuntu, and installed the python-dbg package. When trying to use the installed version directly everything works great:
$ gdb python2.7-dbg
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
---x snipped x---
Reading symbols from /usr/bin/python2.7-dbg...done.
(gdb) r
Starting program: /usr/bin/python2.7-dbg
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Python 2.7.3 (default, Feb 27 2014, 19:39:25)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
Program received signal SIGINT, Interrupt.
0x00007ffff6997743 in __select_nocancel () at ../sysdeps/unix/syscall-template.S:82
82 ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) py-bt (<--- works, just has nothing to do)
(gdb)
所以，我一直在使用包的二进制 python2.7-dbg 构建一个 virtualenv(因为某些库需要重新编译)，使用这个命令行:
So, I've been building a virtualenv using the package's binary python2.7-dbg (since some libraries need recompiling), using this command line:
~$ virtualenv ved -p /usr/bin/python2.7-dbg
一切正常，但是当我在 virtualenv 中使用 gdb 时，至少 python 漂亮的打印机停止工作:
Its all working fine, but when I'm using gdb inside the virtualenv, atleast the python pretty printers stop working:
~$ . ved/bin/activate
(ved)~$ gdb python
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
---x snipped x---
Reading symbols from /home/itai/ved/bin/python...done.
(gdb) r
Starting program: /home/itai/ved/bin/python
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Python 2.7.3 (default, Feb 27 2014, 19:39:25)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
Program received signal SIGINT, Interrupt.
0x00007ffff6997743 in __select_nocancel () at ../sysdeps/unix/syscall-template.S:82
82 ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) py-bt
Undefined command: "py-bt". Try "help". (<---- PROBLEM)
(gdb)
我的 virtualenv 中是否缺少某些内容?
Am I missing something within my virtualenv?
解决方案
我已经通过在 gdb 上使用 strace 解决了这个问题，grepping "open" 系统调用.
I've solved the problem by using strace on gdb, grepping the "open" syscalls.
gdb 似乎在它猜测的几个路径中搜索 python-gdb.py(根据 python 二进制文件)，每当找不到该文件时，它就会默默地失败.
It seems that gdb makes a search for python-gdb.py in several paths it guesses (according to the python binary), and whenever the file is not found it just fails silently.
最终解决问题的方法是将 /usr/lib/debug/usr/bin/python2.7-gdb.py 链接到 env 的 bin 目录中.链接的名称应该是 <python 二进制名称>-gdb.py，在我的例子中是 python2.7-dbg-gdb.py (...).
Eventually the way to solve the problem is to link /usr/lib/debug/usr/bin/python2.7-gdb.py into the env's bin directory. The name of the link should be <python binary name>-gdb.py, being in my case python2.7-dbg-gdb.py (...).
在那之后，一切似乎都正常了.
After that, everything seems to work.
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