Shutdown at the end of all downloads Transmission

I love Transmission for its simplicity and ease of use. But what I would add is the ability to automatically turn off the computer at the completion of all downloads . I made this feature for myself under Ubuntu, but for those who will find it interesting, I think, they can freely remake it for another OS.

The task was solved by means of the RPC-JSON service , kindly provided by Transmission. To enable this feature you need in the Transmission before the tab "Web Interface" in the Settings check the box "Enable Web Interface". If you want to restrict access to the web panel from outsiders, you can set a password and username.

The first step is to install the module for python transmissionrpc . We get it:
hg clone www.bitbucket.org/blueluna/transmissionrpc
Note: The hg program is in the mercurial package. If it is not installed, you need to install it:
sudo apt-get install mercurial
After that, when the source of the module lies on the local computer, you need to install it by going to the transmissionrpc directory:
cd transmissionrpc
sudo python setup.py install
The module is installed, you can write the script itself. But, since our ultimate goal is to turn off the computer, which by default cannot be done without administrative authority, we will have to do a few more gestures.

• Create a script / usr / bin / shutdown by writing to it:
  #!/bin/sh
sudo /sbin/shutdown $*

  As can be seen from the text of the script - it uses the usual / sbin / shutdown, which is passed all the command line parameters passed to our / usr / bin / shutdown. And also / sbin / shutdown is executed with the sudo command, which allows you to execute other commands on behalf of the system administrator.
• Let us assign this script to the shutdown group:
  chgrp shutdown /usr/bin/shutdown
• Set the right to run only the group shutdown:
  chmod g+x /usr/bin/shutdown
• So that sudo does not ask us for a password, we add a line to the / etc / sudoers file:
  %shutdown ALL= NOPASSWD: /sbin/shutdown
  It means that all users in the shutdown group are allowed to run the / sbin / shutdown script with administrative privileges without entering a password.
• Create a group shutdown
  sudo groupadd shutdown
  and add yourself to it using groupadd / usermod or by editing the / etc / group file. I used the last method, for this you need to find in the / etc / group file a type string
  shutdown:x:1002:
  To add yourself to this group, change this entry to this:
  shutdown:x:1002:user1
  where user1 is your username. If you need to add several more users to this group, list them separated by commas in the same line (without spaces). The number 1001 (group ID) may be different.
  In the final form, I got this line like this:
  shutdown:x:1002:skymanphp

So, our command to turn off the computer without asking for a password is ready for use.
Perhaps someone will find this solution a little crooked, then please make your suggestions.

And here is the script itself. I think in the comments to the script everything is clear.
Note. Since I used my own error handler, I had to file
/usr/local/lib/python2.6/dist-packages/transmissionrpc-0.5-py2.6.egg/transmissionrpc/transmission.py
make changes: lines 219-221 are commented out, although this is not critical.
')

1. #! / usr / bin / python
2. # - * - coding: utf-8 - * -
4. # Pay attention to the second line-comment in the script. It allows you to avoid misunderstandings with a unicod encoding in the text of the script.
6. # Import the necessary functions from the corresponding modules
7. from time import localtime strftime sleep
8. from sys import argv
9. from os import geteuid, system
10. from transmissionrpc import client
11. from os.path import isfile
13. # It is not necessary for the user to be an administrator. For then running Transmission as root is undesirable. And why is there admin power?
14. if geteuid () == 0:
15. print "\ 033 [1; 31mYou should not run this script as administrator! \ 033 [1; m"
16. exit ()
18. # Check if libnotify-bin is installed
19. use_libnotify = isfile ( "/ usr / bin / notify-send" )
21. # If not, then we will display a recommendation to do this for user-friendly notifications.
22. if not use_libnotify:
23. # Ask the user
24. res = raw_input ( "\ 033 [1; 33mThe libnotify-bin package is not installed. You can install it with \ nsudo apt-get install libnotify-bin \ nDo it now? Type Y if you agree and press Enter: \ 033 [1; m " )
25. if res in [ 'Y' , 'y' ]:
26. # If he agrees, install the package
27. res = system ( "sudo apt-get install -y libnotify-bin" )
28. if res == 0:
29. # I wonder if the package is installed?
30. print "\ 033 [1; 32mPack libnotify-bin successfully installed! \ 033 [1; m"
31. else :
32. # It seems that the password is incorrectly entered or the problem with the package manager. Although, not the last reason.
33. print "\ 033 [1; 31m Error installing libnotify-bin package. Try to do it yourself later. \ 033 [1; m"
34. else :
35. # Or do not install
36. print "\ 033 [1; 33mIn this case, you can install it later or not install it at all. \ 033 [1; m"
38. try :
39. # Well, let's try to connect to the Transmission RPC service, using the appropriate parameters specified in its settings
40. tc = Client ( 'localhost' , port = 9091, user = None, password = None)
41. except:
42. # Uh-uh .. Transmission, does not seem to be running?
43. print "\ 033 [1; 31mError of connection to Transmission. Maybe it is not running or the web interface is not enabled in the program settings. \ 033 [1; m"
44. # Inquire if you need to start the program now
45. res = raw_input ( "\ 033 [1; 33mStart Transmission now? Enter Y if you agree and press Enter: \ 033 [1; m" )
46. # So what did he put in there?
47. if res in [ 'Y' , 'y' ]:
48. # Well, run, if he agrees. Be sure to in the background!
49. system ( "transmission &" )
50. # and wait 5 seconds for it to load
51. sleep (5)
52. print "\ 033 [1; 32mTransmission successfully started. \ 033 [1; m"
53. # Let’s try again to connect to the Transmission RPC service
54. tc = Client ( 'localhost' , port = 9091, user = None, password = None)
56. else :
57. # We are leaving. Do not want what you want. Why then was it to run this script at all?
58. print "\ 033 [1; 33mCompletion of the script. \ 033 [1; m"
59. exit ()
60. else :
61. # If, after all, we have established a connection with Transmission, then we will rejoice about this user
62. print "\ 033 [1; 32mConnection to Transmission established. \ 033 [1; m"
64. # We will use the variable-flag of downloading to indicate whether at least one torrent is being downloaded. Initial value = True to start our validation cycle.
65. downloading = true
67. # While downloads are going (checking the downloading flag)
68. while downloading:
69. # And immediately reset it to False
70. downloading = False
71. # How many torrents?
72. trc = len (tc.list ())
73. # Clear the console for beautiful output
74. system ( "clear" )
75. # Colorize: \ 033 [brightness; color
76. print "\ 033 [1; 36m ==== Download Status ==== \ 033 [1; m"
77. # let's start going through all the torrents
78. for i in range (1, trc):
79. # Get information about the torrent with the index i
80. torrent = tc.info (i) [i]
81. # Default color
82. col = "\ 033 [2; 37m"
83. # Every man to his own taste!
84. if torrent.status == "seeding" :
85. col = "\ 033 [1; 36m"
86. elif torrent.status == "downloading" :
87. col = "\ 033 [1; 32m"
88. elif torrent.status == "checking" :
89. col = "\ 033 [1; 34m"
90. print col + torrent.status + "(" + str ( "% .3g" % torrent.progress) + "%)" + torrent.name + "\ 033 [1; m"
91. # Is it downloaded / checked? If not, this cycle will be interrupted, since the downloading flag will be set to False
92. downloading = downloading or (torrent.status == "downloading" ) or (torrent.status == "checking" )
93. print "\ 033 [1; 36m ==== Total torrents:" + str (trc) + "==== \ 033 [1; m"
94. # Breathe before the next check.
95. sleep (10)
97. # Since we have reached here, it means downloading = False. Well, let's start the computer shutdown procedure.
98. try :
99. # If the libnotify-bin package is installed, let's say this to the user beautifully.
100. if use_libnotify:
101. system ( 'notify-send "All downloads are complete" "The system is shutting down. You can interrupt the script by pressing Ctrl + C in the script window." -i /usr/share/icons/gnome/scalable/actions/exit.svg' )
102. # Or not quite beautiful ...
103. print "\ 033 [1; 31mAll downloads are complete. The system is shutting down. You can interrupt the script by pressing Ctrl + C in the script window. \ 033 [1; m"
104. # Give the user the last chance - 30 seconds to interrupt the script
105. sleep (30)
106. # if, after all, he interrupted him by pressing the key combination Ctrl + C
107. except KeyboardInterrupt:
108. # If the libnotify-bin package is installed, let's say this to the user beautifully.
109. if use_libnotify:
110. system ( 'notify-send "Shut down stopped" "Interrupted by user." -i /usr/share/icons/gnome/scalable/actions/redo.svg' )
111. # Or not quite beautiful ...
112. print "\ 033 [1; 31mCompletion stopped" "Interrupted by user. Exit script \ 033 [1; m"
113. # We leave away from the script
114. exit ()
116. # And here it is, in fact, the function that initiates the shutdown of the system. Shutdown!
117. system ( "/ usr / bin / shutdown -h now" )
118. # If suddenly it will be interesting to the falling asleep user, when the script has started shutting down, open the file for this in the record mode
119. f = open ( '/tmp/shutdownctl.time' , 'a' )
120. # And write down our event there, specifying the time.
121. f.write ( 'Shutdown was started at' + strftime ( "% a,% d% b% Y% H:% M:% S" , localtime ()) + '\ n' )
122. # And finally, close the log file.
123. f.close
124. # That's all!

This code was highlighted with SkyManPHP .

If desired, you can finish it by using the documentation on the transmissionrpc module . Although, I believe that there are already such solutions on the Internet, even though I did not find them in such a way as I would like.
Therefore, I do not pretend to originality. And I don’t write in Python at all - I’ve spied on some commands in Google. But if anyone needs it, I will be happy.