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    <p>Chris: Since you have a simple-ish example of using os.pipe thanks to Lars, I'll offer what <a href="https://github.com/ryran/pyrite/" rel="nofollow">Pyrite</a> (my GTK frontend for gpg) does as well in the hope that more code examples are better. My use case is a little more complicated than yours due to the gui aspect -- I actually use a dictionary for input and output, and I have code to launch gpg with stdin as input and code that launches it with files as input, among other complications.</p> <p>That warning said, I start with the gpg commandline in a list just like you do; however, instead of using <code>--passphrase-fd 0</code>, I create a custom file descriptor via <code>os.pipe()</code> to send the passphrase before loading the <code>Popen()</code> instance, which has <code>stdin=subprocess.PIPE</code> for the input data. Following are some relevant (modified) excerpts from pyrite's <a href="https://github.com/ryran/pyrite/blob/master/modules/crypt_interface.py" rel="nofollow">crypt_interface</a> module.</p> <pre><code>#!/usr/bin/env python # Adapted excerpts from Pyrite &lt;http://github.com/ryran/pyrite&gt; from subprocess import Popen, PIPE, check_output ... # I/O dictionary obj self.io = dict( stdin='', # Stores input text for subprocess stdout='', # Stores stdout stream from subprocess stderr=0, # Stores tuple of r/w file descriptors for stderr stream gstatus=0, # Stores tuple of r/w file descriptors for gpg-status stream infile=0, # Input filename for subprocess outfile=0) # Output filename for subprocess ... cmd = ['gpg'] fd_pwd_R, fd_pwd_W = os.pipe() os.write(fd_pwd_W, passwd) os.close(fd_pwd_W) cmd.append('--passphrase-fd') cmd.append(str(fd_pwd_R)) ... # If working direct with files, setup our Popen instance with no stdin if self.io['infile']: self.childprocess = Popen(cmd, stdout=PIPE, stderr=self.io['stderr'][3]) # Otherwise, only difference for Popen is we need the stdin pipe else: self.childprocess = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=self.io['stderr'][4]) # Time to communicate! Save output for later self.io['stdout'] = self.childprocess.communicate(input=self.io['stdin'])[0] # Clear stdin from our dictionary asap, in case it's huge self.io['stdin'] = '' # Close os file descriptors if fd_pwd_R: os.close(fd_pwd_R) time.sleep(0.1) # Sleep a bit to ensure everything gets read os.close(self.io['stderr'][5]) if self.io['gstatus']: os.close(self.io['gstatus'][6]) ... </code></pre> <p>The function that calls all that waits until the <code>self.childprocess</code> object has a <code>returncode</code> attribute and assuming the returncode was <code>0</code> and that the input was text (and not a file), it then reads gpg's stdout from that dictionary and prints it to the screen.</p> <p>Happy to answer questions or try to help from my limited experience. Can find my contact info by following links.</p> <p>Edit: You might also find <a href="https://github.com/ryran/b19scripts/blob/master/a4crypt.py" rel="nofollow">a4crypt</a> instructive as it is a much simpler frontend for gpg -- it was the project I started in order to learn python, and later mothballed after I "completed" (if there is such a thing) pyrite.</p>
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