Pass the $HOME directory to vpasswd

So far the call to `vpasswd` broke since it `cd`s into `$HOME`, which is not
set in the fcgi environment.

This commit assembles the home directory from the configured user name and
passes a modified environment to the call of `vpasswd`.

README.md

@@ -29,8 +29,8 @@ Deployment
 
     1. Configure the domain of the email accounts
     2. Configure the IMAP server
-    3. Generate 2 strong secrets to derive session keys and CSRF nonces from
-    4. Configure the log file and log level
+    3. Configure your Uberspace user name
+    4. Generate 2 strong secrets to derive session keys and CSRF nonces from
 
  3. Create a `fcgi` file
 

config.py

@@ -12,11 +12,14 @@
 
 DOMAIN = '<YOUR EMAIL DOMAIN>'
 UBERSPACE_SERVER = '<YOUR UBERSPACE SERVER>'
+UBERSPACE_USER = '<YOUR USER>'
 
 SECRET_KEY = '<REPLACE THIS WITH A SECRET, UNIQUE KEY!>'
 WTF_CSRF_SECRET_KEY = '<REPLACE THIS WITH ANOTHER SECRET, UNIQUE KEY!>'
 
-LOG_FILE = '/var/www/virtual/<YOUR USER>/uberspace_vpasswd/fcgi.log'
+HOME = '/home/%s' % UBERSPACE_USER
+
+LOG_FILE = '/var/www/virtual/%s/uberspace_vpasswd/fcgi.log' % UBERSPACE_USER
 LOG_LEVEL = logging.DEBUG
 
 DEBUG = True

vpasswd.py

@@ -107,9 +107,11 @@ def _credentials_are_valid(email, password):
 
 
 def _set_new_password(user, password):
-    command = 'vpasswd {}'.format(user)
-
-    vpasswd = pexpect.spawn(command)
+    vpasswd = pexpect.spawn(
+        command='vpasswd',
+        args=[user],
+        env={'HOME': app.config['HOME']}
+    )
 
     vpasswd.expect('password:')
     vpasswd.sendline(password)