alert: Notify your desktop or mobile device when a job completes

WORK IN PROGRESS. This is under heavy development the week of 8 May 2017.

At Faraday, we have a lot of long-running processes, and we need an easy way to know when they complete. The alert command is intended to make it easy to know when things succeed or fail:

```sh

Supply a pushover.net application token. We'll make it easy to create these

soon.

export PUSHOVER_TOKEN=...

Supply your pushover.net user key.

export PUSHOVERUSER=... alert run mylongrunningcommand ```

This will play different sounds for success and failure.

Right now, we only support Superblock, LLC's Pushover system, which provides excellent, hard-to-miss notifications for iOS, Android and web browsers. (This application has no relation to Superblock, LLC. We just use their API.)

Wishlist

Some features which we want to add:

```sh

Periodically poll commands and read their output.

alert watch -n 5 -s 'myjob.failed' -f 'myjob.success' \ --timout 10m \ pachctl list-jobs ```

We'd also list to add:

• Support for desktop notifications on OS X and Linux.
• Support for free phone notifications using notify-cli's API. These are less portable than Pushover's notifications and they have fewer options for playing loud and obnoxious sounds, but they're free.
• Maybe some sort of mode for watching to see when a host has finished booting?

Installing

On Linux, you'll need to install the dbus-1 dev packages.

```sh

Ubuntu, etc.

sudo apt install libdbus-1-dev ```

Once this is done, install Rust and alert:

sh curl https://sh.rustup.rs -sSf | sh cargo install alert