Error subprocess.Popen

Question

I run the msi installer in silent mode and cache logs in a specific file. Below is the command I need to execute.

C:\Program Files\ My Installer\Setup.exe /s /v "/qn /lv %TEMP%\log_silent.log"

I used:

subprocess.Popen(['C:\Program Files\ My Installer\Setup.exe', '/s /v "/qn /lv %TEMP%\log_silent.log"'],stdout=subprocess.PIPE).communicate()[0]

to execute the command, however, it does not recognize the operation and gives an error regarding the selected option. I cross-checked and found that the team only works that way.

Answer 1

The problem is very subtle.

You execute the program directly. He receives:

argv[0] = "C:\Program Files\ My Installer\Setup.exe"
argv[1] = /s /v "/qn /lv %TEMP%\log_silent.log"

While it should be:

argv[1] = "/s"
argv[2] = "/v"
argv[3] = "/qn"
argv[4] = "/lv %TEMP%\log_silent.log"

In other words, it should receive 5 arguments, not 2 arguments.

In addition, %TEMP%it is directly unknown to the program!

There are two ways to fix this problem:

• Shell call.

  p = subprocess.Popen('C:\Program Files\ My Installer\Setup.exe /s /v "/qn /lv %TEMP%\log_silent.log"', shell=True)
  output = p.communicate()[0]
  

• ( )

  s = ['C:\Program Files\ My Installer\Setup.exe', '/s /v "/qn /lv %TEMP%\log_silent.log"']
  safes = [os.path.expandvars(p) for p in argument_string]
  p = subprocess.Popen(safes[0], safes[1:])
  output = p.communicate()[0]
  

Answer 2

, Setup.exe . , , , , !

, , "/qn/lv% TEMP%\log_silent.log" , :

subprocess.Popen(['C:\Program Files\ My Installer\Setup.exe', '/s', '/v', '/qn /lv %TEMP%\log_silent.log'],stdout=subprocess.PIPE).communicate()[0]

( , ), :

subprocess.Popen(['C:\Program Files\ My Installer\Setup.exe', '/s', '/v', '/qn', '/lv', '%TEMP%\log_silent.log'],stdout=subprocess.PIPE).communicate()[0]

Answer 3

( ):

cmd = ['C:\Program Files\ My Installer\Setup.exe',
       '/s',
       '/v',
       '"/qn',
       '/lv',
       '%TEMP%\log_silent.log"']

subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()[0]

, .

Answer 4

:

subprocess.Popen(['C:\Program Files\ My Installer\Setup.exe', '/s /v "/qn /lv %TEMP%\log_silent.log"'],stdout=subprocess.PIPE).communicate()[0]

" " ( )?

Also, as a rule, you should use slashes in the path specifications. Python should handle them without problems (even on Windows), and you avoid any problems interpreting python backslashes as escape characters.

(eg:

>>> s = 'c:\program files\norton antivirus'
>>> print s
c:\program files
orton antivirus

)