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Wait For Zeus

Starts the Zeus gem in the background and waits (blocks) until all of its sub-processes have loaded.

Usage

When the script is first called within a Rails project it will call zeus start in a background job and redirect all output to the $HOME/zeus.meta/ttysXXX/output.log file. After all of the sub processes have been loaded the last output of Zeus will be echoed to STDOUT.

These actions and events are shown below...

$ ./wait_for_zeus.sh 
[PID: 32134] - Starting Zeus in background.
Loading Zeus Processes .............................
[PID: 32134] - Zeus is now running.
[ready] [crashed] [running] [connecting] [waiting]
boot
└── default_bundle
 ├── test_environment
 │  └── test_helper
 └── development_environment
  └── prerake

Available Commands: [waiting] [crashed] [ready]
zeus test (alias: rspec, testrb)
zeus console (alias: c)
zeus runner (alias: r)
zeus destroy (alias: d)
zeus dbconsole
zeus server (alias: s)
zeus generate (alias: g)
zeus rake

$ _

Running the script when an instance of Zeus exists within the current tty should prompt the user for actions...

$ ./wait_for_zeus.sh 
[PID: 32134] - Zeus is already running.
[ready] [crashed] [running] [connecting] [waiting]
boot
└── default_bundle
 ├── test_environment
 │  └── test_helper
 └── development_environment
  └── prerake

Available Commands: [waiting] [crashed] [ready]
zeus test (alias: rspec, testrb)
zeus console (alias: c)
zeus runner (alias: r)
zeus destroy (alias: d)
zeus dbconsole
zeus server (alias: s)
zeus generate (alias: g)
zeus rake

ACTIONS: [R]estart Zeus, [K]ill Zeus, [c]ontinue? [RKc]: _

Warnings & Limitations

  • The script was developed for fun over a weekend and should be treated as a Proof of Concept at this point in time.
  • All process parsing is scoped through the current tty, which should be fine so long as each app has a seperate terminal tab.
    • However, the script will not operate as expected if one decides to switch between Rails projects (within the same tab/session) and calls ./wait_for_zeus.sh multiple times.

Author

Licence & Copyright

  • New BSD License
  • Copyright (c) 1999 - 2013, Daniel Doezema