Babushka is a tool for automating system tasks like deploying applications and setting up development environments. It uses a dependency management system where each task is defined, and dependencies can be checked and executed. Babushka can integrate with Git and has some convenience methods for managing repositories and libraries, but it is designed for single-system use, complementing tools like Chef and Puppet.

1. Babushka
Richard McGain
@mcgain
richardmcgain.com

2. the name
Babushka in Russian means "mother"
But. . .
In Australia, it is the name for
Russian Nesting Dolls

3. the installer .
$ sh -c "`curl https://babushka.me/up`"
This installs Babushka, ruby and git
(if they are not already installed)

4. the purpose
Automates system tasks such as:
● Deploys
● Setting up your dev box
● Other important stuff you don't want
screwed up

5. the basics
$ babushka deploy
A dependency or "dep"
The command

6. the concept
dep "dep names can have spaces" do
met? {
return true or false
no side effects
}
meet {
do the actual work here
}
end

7. the code
dep "precompile assets" do
met? {
File.directory? "public/assets"
}
meet {
`rake assets:precompile`
}
end

8. the require
dep "deploy" do
requires [
"precompile assets",
"push to heroku"
]
end

9. the variables .
$ babushka push ref=master remote=origin
dep "push", :ref, :remote do
requires("repo exists").with(remote)
`git push #{remote} #{ref}:#{ref}`
end

10. the file
Where does Babushka look for this dep?
./babushka-deps/
~/.babushka-deps/
/usr/local/bin/babushka/deps/
it looks for all ruby files
recursively.

11. the github
$ babushka mcgain:deploy
it clones:
github.com/mcgain/babushka-deps
then loads the repo and runs the dep
WARNING: only do this for deps you
trust

12. the shell
shell "rake annotate"

13. the shell
shell "[ 1 == 0 ]" do |s|
if s.result == 1
math_seems_to_work
end
end

14. the stdout
Also stderr!
shell "grep" do |s|
puts s.stdout #prints nothing
puts s.stderr #prints helpful error
end

15. the cd
We can cd
cd "~/.vim/bundle"
shell "git clone gh.co/tpope/vim-repo"
cd "~/.vim/bundle" do
shell "git clone gh.co/vim/plugin"
end

16. the git
def rails_repo
@repo ||= Babushka::GitRepo.new(
'some-git-repo'
)
end
rails_repo.repo_shell "git push"

17. the methods
There are some convenience methods:
rebasing?
current_head
branch!
checkout!
reset_hard!
ahead?
behind?

18. the install
dep "colors.npm"
will install the node package colors
but if the name doesn't match
dep 'django.pip' do
installs 'Django'
provides 'django-admin.py'
end

19. the list
.lib for libraries
.bin for binaries
.gem for gems
.py ...
.npm ...

20. the ruby
dep 'ruby.bin' do
installs {
via [:lenny, :hardy, :lucid],
%w[ruby irb ruby1.8-dev]
via :apt, %w[ruby ruby1.8-dev]
via :yum, %w[ruby ruby-irb]
otherwise 'ruby'
}
provides 'ruby >= 1.8.6', 'irb'
end

21. the versions
dep 'postgres.bin' do
installs 'postgresql'
provides 'psql ~> 9.0.0'
end

22. the integration .
Although it is a standalone tool it is
also a library (with / without DSL )
Babushka does not scale, 1 system only
Chef, Capistrano, Vagrant, Puppet all
solve a slightly different problem and
are complementary.

23. the future
google for:
site:github.com babushka-deps
Questions?
Richard McGain
@mcgain
richardmcgain.com