ScTmux

When I run tmux on a remote host I lose access to my ssh-agent if I detach and attach again. Existing windows have old ssh-agent environment values. I also like to have my tmux windows named by the host I'm connecting to. This gem resolves those two problems.

This script started as a set of bash scripts which made it easier to refresh ssh-agent info on existing tmux windows. These are now implemented as a gem which installs an 'sc' binary.

sc has a number of features:

• Collect ssh-agent vars to a file for use in other operations
• make current ssh-agent vars available to eval in a new shell
• Set the title on new tmux windows when you ssh to a host (requires you use 'sc' instead of 'ssh')
• create new tmux sessions or attach to existing ones, runs sc -g automatically when re-attaching

Installation is simple:

$ gem install sc_tmux

You will also want to add this alias wherever you store your aliases:

alias fixssh='eval $(sc -f)'

sc is run both with arguments to interact with tmux & your shell as well as run as an ssh replacement.

When run as an ssh replacement it simply pulls the current ssh-agent vars into the shell (sc -f), outputs the result of which ssh to show which ssh binary is being run and then opens a new tmux window named after the hostname you specify to ssh to the host.

Example:

$ sc somehost

or

$ sc username@somehost

-g Grab SSH

This stores the current ssh-agent vars to a file for later use. This happens automatically if you use the --attach option. You may also run it just before re-attaching to your tmux session.

For example, I use tmuxinator, so I have the following alias: alias mux='sc -g && mux'

-f Fix SSH

This will output the current values stored by the -g option. Unfortunately it's really only useful when used inside an alias because you need to eval the contents of the file - thus I usually add the following alias:

alias fixssh='eval $(sc -f)'

Then when you want to 'fix' ssh inside a pre-existing tmux window you just type fixssh.

-s Setup

This is just a convenience method that outputs the fix alias above so you can easily add it to your setup.

-a Attach

This will first store the current ssh-agent vars and then will attempt to attach to an existing tmux session. This assumes a tmux session exists with the same name as is passed by the -n parameter ('prod' by default)

-c Create

This will create a new tmux session using the configured session name if one doesn't already exist.

-n Socket Name

This will use the specified socket name when starting tmux - this allows you to have multiple tmux sessions attached to different sockets.

--agent_file Agent file

This is the name of the file used to store the ssh-agent var values. By default this filename is based on your hostname (to be compatible w/ shared home directories) and is listed in the help output.

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Add your tests, then add your new awesomeness
4. Commit your changes (git commit -am 'Add some feature')
5. Push to the branch (git push origin my-new-feature)
6. Create new Pull Request