irc.json

{
    "name": "irc",
    "active": true,
    "events": [
        "issues",
        "issue_comment",
        "fork",
        "watch",
        "push",
        "create",
        "delete",
        "commit_comment",
        "pull_request",
        "pull_request_review_comment",
        "deployment",
        "deployment_status",
        "gollum",
        "member",
        "public",
        "release",
        "status",
        "team_add",
        "watch"
    ],
    "config": {
        "server": "chat.freenode.net",
        "port": "6667",
        "room": "#CHANGEME",
        "nick": "[GH]",
        "ssl": "0",
        "message_without_join": "1",
        "no_colors": "0",
        "long_url": "1",
        "notice": "0"
    }
}

POST.sh

#!/bin/bash

OTP=$1

owner=$2
repo=$3
user=CHANGEME

curl -H "X-GitHub-OTP: $OTP" -i -u $user -X POST https://api.github.com/repos/$owner/$repo/hooks --data @irc.json

Clone this, change the room's name and your GitHub username, then run the script. It'll ask your GitHub password (this will not be saved.) The first and argument should be the name of the owning user/org, and the repository, respectively.

Your user account must have permissions to control the repo in question.

Example:

./repo_add_irc.sh elliottcable Paws.js
./repo_add_irc.sh Paws Issues

(= /ht @metajack