子进程和额外参数

Question

我正在尝试使用以下代码：

args = 'LD_LIBRARY_PATH=/opt/java/jre/lib/i386/:/opt/java/jre/lib/amd64/ exec /opt/java/jre/bin/java -Xincgc -Xmx1G -jar craftbukkit-0.0.1-SNAPSHOT.jar'.split()
p = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

但是，我得到的结果是：

Traceback (most recent call last):
File "launch.py", line 29, in <module>
p = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
File "/usr/lib/python2.7/subprocess.py", line 679, in __init__ errread, errwrite)
File "/usr/lib/python2.7/subprocess.py", line 1228, in _execute_child raise child_exception
OSError: [Errno 2] No such file or directory

如果不加上LD_LIBRARY_PATH这一部分，代码运行得很好。不过，我确实需要它。谢谢你的帮助。

Answer 1

试着在 Popen 调用中加上 shell = True：

p = subprocess.Popen(args, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

你现在用来设置 LD_LIBRARY_PATH 的语法是属于命令行的写法，所以必须通过命令行来执行这个命令。

Answer 2

这里有一种方法，不需要使用命令行：

from subprocess import Popen
from os import environ

env = dict(os.environ)
env['LD_LIBRARY_PATH'] = '/opt/java/jre/lib/i386/:/opt/java/jre/lib/amd64/'
args = ['/opt/java/jre/bin/java', '-Xincgc', '-Xmx1G', '-jar', 'craftbukkit-0.0.1-SNAPSHOT.jar']
p = Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)