python 在本地网络中复制文件(linux -> linux)并输出

2022-01-18 00:00:00 python subprocess networking local scp

问题描述

我正在尝试编写一个脚本来从我的台式电脑复制树莓派中的文件.这是我的代码:(一部分)

I'm trying to write a script to copy files in my RaspberryPi, from my Desktop PC. Here is my code: (a part)

print "start the copy"   
path_pi = '//192.168.2.2:22/home/pi/Stock/'
file_pc = path_file + "/" + file
print "the file to copy is: ", file_pc

shutil.copy2(file_pc, path_pi + file_pi)

其实我有这个错误:(法语)

Actually I have this error: (in french)

IOError: [Errno 2] Aucun fichier ou dossier de ce type: '//192.168.2.2:22/home/pi/Stock/exemple.txt'

那么，我该如何继续?我必须在尝试复制之前连接两台机器吗?我试过了:

So, how could I proceed? Must I connect the 2 machines before trying to copy? I have tryed with:

path_pi = r'//192.168.2.2:22/home/pi/Stock'

但问题是一样的.(而file_pc是一个变量)

But the problem is the same. (And file_pc is a variable)

谢谢

好的，我找到了这个:

command = 'scp', file_pc, file_pi  
p = subprocess.Popen(command, stdout=subprocess.PIPE)

但没有办法获得输出...(使用 Shell=False)

But no way to have the output... (work with Shell=False)

解决方案

shutil.copy2() 适用于本地文件.192.168.2.2:22 建议您要通过 ssh 复制文件.您可以将远程目录 (RaspberryPi) 挂载到桌面计算机 (sshfs) 上的本地目录上，以便 shutil.copy2() 工作.

shutil.copy2() works with local files. 192.168.2.2:22 suggests that you want to copy files over ssh. You could mount the remote directory (RaspberryPi) onto a local directory on your desktop machine (sshfs) so that shutil.copy2() would work.

如果您想查看命令的输出，请不要设置 stdout=PIPE (注意:如果您设置了 stdout=PIPE 那么您应该从 p.stdout 否则进程可能永远阻塞):

If you want to see the output of a command then don't set stdout=PIPE (note: if you set stdout=PIPE then you should read from p.stdout otherwise the process may block forever):

from subprocess import check_call

check_call(['scp', file_pc, file_pi])

scp 将打印到您的父 Python 脚本打印的任何位置.

scp will print to whatever places your parent Python script prints.

以字符串形式获取输出:

To get the output as a string:

from subprocess import check_output

output = check_output(['scp', file_pc, file_pi])

虽然看起来 scp 如果输出被重定向，默认情况下不会打印任何内容.

Though It looks like scp doesn't print anything by default if the output is redirected.

您可以使用 pexpect 让 scp 认为它在终端中运行:

You could use pexpect to make scp think that it runs in a terminal:

import pipes
import re
import pexpect # $ pip install pexpect

def progress(locals):
    # extract percents
    print(int(re.search(br'(d+)%[^%]*$', locals['child'].after).group(1)))

command = "scp %s %s" % tuple(map(pipes.quote, [file_pc, file_pi]))
status = pexpect.run(command, events={r'd+%': progress}, withexitstatus=1)[1]
print("Exit status %d" % status)

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