christos

To symlink SSH_AUTH_SOCK on boot to system-wide switch the value from default ssh agent:

1. Change /opt/homebrew/ to the correct homebrew path (/opt/homebrew is for Apple Silicon and /usr/local for x86)
2. Change the ssh agent as needed, this example uses https://github.com/FiloSottile/yubikey-agent
3. Save as ~/Library/LaunchAgents/link-ssh-auth-sock.plist
4. Run launchctl load -F ~/Library/LaunchAgents/link-ssh-auth-sock.plist

Technique taken from: https://evilmartians.com/chronicles/stick-with-security-yubikey-ssh-gnupg-macos

christos

access_key_id = ENV.fetch("APP_S3_ACCESS_KEY_ID")
secret_access_key = ENV.fetch("APP_S3_SECRET_ACCESS_KEY")
bucket_name = ENV.fetch("APP_S3_BUCKET")

s3 = AWS::S3.new(access_key_id: access_key_id, secret_access_key: secret_access_key)
bucket = s3.buckets[bucket_name]
object = bucket.objects["whatever/you/want"]
presign = AWS::S3::PresignV4.new(object)
presign.presign(:put, expires: 15.minutes.from_now.to_i)
# => #<URI::HTTP:0x007fcfcd97e1a0 URL:***stuff***>

christos

require 'benchmark/ips'
require 'redis'
class MethodProfiler
  def self.patch(klass, methods, name)
    patches = methods.map do |method_name|
      <<~RUBY
      unless defined?(#{method_name}__mp_unpatched)
        alias_method :#{method_name}__mp_unpatched, :#{method_name}
        def #{method_name}(*args, &blk)
          unless prof = Thread.current[:_method_profiler]

christos

default: &default
  adapter: mysql2
  encoding: utf8mb4
  username: root
  password:
  host: localhost
  variables:
    sql_mode: TRADITIONAL,NO_AUTO_VALUE_ON_ZERO,ONLY_FULL_GROUP_BY

development:

christos

## GistList: TODO for coders

christos

def build_path
  "build/iPhoneOS-6.0-Release/"
end

def ipa_name
  '"Today\'s Shirts.ipa"'
end

def dsym_name
  '"Today\'s Shirts.dSYM"'

christos

# in rails application.rb

initializer "postgresql.no_default_string_limit" do
  ActiveSupport.on_load(:active_record) do
    ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::NATIVE_DATABASE_TYPES[:string].delete(:limit)
  end
end

christos

RSpec.configure do |config|
  config.around do |example|
    # For examples using capybara-webkit for example.
    # Remove this if you don't use it or anything similar
    if example.metadata[:js]
      example.run

      ActiveRecord::Base.connection.execute("TRUNCATE #{ActiveRecord::Base.connection.tables.join(',')} RESTART IDENTITY")
    else
      ActiveRecord::Base.transaction do

christos

Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

christos

#!/bin/sh

# Alot of these configs have been taken from the various places
# on the web, most from here
# https://github.com/mathiasbynens/dotfiles/blob/master/.osx

# Set the colours you can use
black='\033[0;30m'
white='\033[0;37m'
red='\033[0;31m'