master connection doc

diff --git a/remoteusage/aboriginal.mdwn b/remoteusage/aboriginal.mdwn
index a558044f1771486a2bf03897223c64fbbe5656a2..ccaded1c6101895c9416d5372f4790fb602b2170 100644 (file)
--- a/remoteusage/aboriginal.mdwn
+++ b/remoteusage/aboriginal.mdwn
@@ -11,6 +11,9 @@ its own connection. As long as master ssh connection is live, slave
 can use it. Disconnecting master all future attempts to connect
 from the script will fail.
 
+At the end of this document there is information for some possible ways
+how master ssh connection can be done.
+
 ## The script
 
 Write the following code to a file, for example `remote-notmuch.sh`.
@@ -65,12 +68,12 @@ address `0.1` is invalid this attempt will fail early.
 Easiest way to test this script is to run the pre-made ssh connection
 using the following command line:
 
-        ssh -M -S '~'/.ssh/master-user@host:22 [user@]remotehost
+        ssh -M -S '~'/.ssh/master-user@host:22 [user@]remotehost sleep 600
 
 (replace `[user@]remotehost` with your login info). Doing this the
-above script can be run unmodified. After the above command has been
-run on one terminal, enter `chmod +x remote-notmuch.sh` in another
-terminal and then test the script with `./remote-notmuch.sh help`
+above wrapper script can be run unmodified. After the above command has
+been run on **one terminal**, enter `chmod +x remote-notmuch.sh` in
+**another terminal** and then test the script with `./remote-notmuch.sh help`
 
 Note that the '~' is inside single quotes for a reason. In this
 case shell never expand it to `$HOME` -- ssh does it by not reading
@@ -102,3 +105,31 @@ to the `./remote-notmuch.sh` wrapper script testing with
 
 See the section *Configure Emacs on the client computer* in
 [[remoteusage|remoteusage]] how to do this. The instructions are the same.
+
+
+## Creating master connection
+
+As mentioned so many times, using this solution requires one pre-made
+ssh connection in "master" mode. The simplest way is to dedicate one
+terminal for the connection with shell access to the remote machine:
+
+        ssh -M -S '~'/.ssh/master-user@host:22 [user@]remotehost
+
+One possibility is to have this dedicated terminal in a way that the
+connection has (for example 1 hour) timeout:
+
+        ssh -M -S '~'/.ssh/master-user@host:22 [user@]remotehost sleep 3600
+
+The above holds the terminal. The next alternative puts the command in
+background:
+
+        ssh -f -M -S '~'/.ssh/master-user@host:22 [user@]remotehost sleep 3600
+
+If you don't want this to timeout so soon, use a longer sleep, like 99999999
+(8 9:s, 1157 days, a bit more than 3 years).
+
+A more "exotic" solution would be to make a shell script running on remote
+machine, checking/inotifying when new mail arrives. When mail arrives it
+could send message back to local host, where a graphical client (to be written)
+pops up on display providing info about received mail (and exiting this
+graphical client connection to remote host is terminated).