Module: Deployinator::Helpers::GitHelpers

Included in:
Views::Layout
Defined in:
lib/deployinator/helpers/git.rb

Overview

Public: module containing helper methods for interacting with git repositories and extracting information from them.

Constant Summary collapse

@@rev_head_cache =

Where we cache the current head rev. stack name wil be appended

"/tmp/rev_head_cache"
@@rev_head_cache_ttl =

How many seconds the head rev cache is good for

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Instance Method Summary collapse

Instance Method Details

#build_git_cmd(cmd, extra_cmd) ⇒ Object 



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# File 'lib/deployinator/helpers/git.rb', line 16

def build_git_cmd(cmd, extra_cmd)
  unless extra_cmd.nil? or extra_cmd.empty?
    "#{extra_cmd} '#{cmd}'"
  else
    cmd
  end
end

#get_git_head_rev(stack, branch = 'master', protocol = 'git') ⇒ Object

Public: get the short sha of the remote HEAD rev of a stack repo. Beware that a true git short rev can also be longer than git_sha_length chars and this way of retrieving it is no guarantee to get a unique short rev. But the alternative is cloning the repo and do a git rev-parse –short

Parameters:

stack  - name of the stack for the repo
branch - name of the branch to test (default: master)

Returns the rev as a string



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# File 'lib/deployinator/helpers/git.rb', line 207

def get_git_head_rev(stack, branch='master', protocol='git')
  cmd = %x{git ls-remote -h #{git_url(stack, protocol)} #{branch} | cut -c1-#{Deployinator.git_sha_length}}.chomp
end

#git_bump_version(stack, version_dir, extra_cmd = "", path = nil, rev = "HEAD", tee_cmd = "tee") ⇒ Object

Public: method to get the short rev of a git commit and create a version tag from it. The tag is then dumped into a version text file.

stack - String representing the stack, which determines where the

version file should be located

version_dir - String (or Array of Strings) representing the

directories to contain the version file

extra_cmd - String representing an additional command to prepend to

the version echo command (default: "")

path - String containing the base path where the version file is

located (default: nil)

rev - String containing the rev to parse for the short SHA id

(default: "HEAD")

Returns STDOUT of the echo command



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# File 'lib/deployinator/helpers/git.rb', line 40

def git_bump_version(stack, version_dir, extra_cmd="", path=nil, rev="HEAD", tee_cmd="tee")
  unless version_dir.kind_of?(Array)
    version_dir = [version_dir]
  end

  ts = Time.now.strftime("%Y%m%d-%H%M%S-%Z")

  path ||= git_checkout_path(checkout_root, stack)

  cmd = "cd #{path} && git rev-parse --short=#{Deployinator.git_sha_length} #{rev}"
  cmd = build_git_cmd(cmd, extra_cmd)
  sha1 = run_cmd(cmd)[:stdout]

  version = "#{sha1.chomp}-#{ts}"

  fullpaths = ""
  version_dir.each do |dir|
    fullpath = File.join(dir, "version.txt")
    fullpaths << fullpath + " "
  end

  log_and_stream "Setting #{fullpaths} to #{version}"

  cmd = "cd #{path} && echo #{version} | #{tee_cmd} #{fullpaths}"
  cmd = build_git_cmd(cmd, extra_cmd)
  run_cmd cmd

  return version
end

#git_checkout_path(checkout_root, stack) ⇒ Object

Public: git helper method to get the path to checkout the git repo to

checkout_root - the directory base for the repo location stack - String representing the stack, which determines where the

version file should be located

Returns path to checkout git repo to



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# File 'lib/deployinator/helpers/git.rb', line 77

def git_checkout_path(checkout_root, stack)
  if (git_info_for_stack[stack.intern].has_key?(:checkout_dir))
    dir = git_info_for_stack[stack.intern][:checkout_dir].to_s
  else
    dir = stack.to_s
  end
  File.join(checkout_root, dir)
end

#git_clone(stack, repo_url, extra_cmd = "", checkout_root = checkout_root, branch = 'master') ⇒ Object

Public: helper method which wraps git clone

Examples:

git_clone('web', '[email protected]:web.git)

stack - the stack to clone repo_url - the remote url of the repo to clone extra_cmd - command to prepend before the actual command checkout_root - base directory to clone into branch - Git branch to checkout. Defaults to ‘master’.

Returns nothing



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# File 'lib/deployinator/helpers/git.rb', line 223

def git_clone(stack, repo_url, extra_cmd="", checkout_root=checkout_root, branch='master')
  path =  git_checkout_path(checkout_root, stack)
  cmd = "git clone #{repo_url} -b #{branch} #{path}"
  cmd = build_git_cmd(cmd, extra_cmd)
  run_cmd cmd
end

#git_filter_shas(stack, extra_cmd, old_rev, new_rev, path = nil, filter_files = [], including = false) ⇒ Object

Public: Filters a range of commits and either returns all commit shas that only include the filter_file, or the inverse list of shas.

stack - the stack to refresh or clone the repo for extra_cmd - cmd to prepend before the actual command old_rev - the git sha representing an older rev. new_rev - the git sha representing a newer rev. path - optional parameter to overide the path to the git repo. filter_files - filepaths relative to the root of the git repo to use as the filter including - Should the returned list of filters include the filter_file commits, or all other commits

Returns an array of shas



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# File 'lib/deployinator/helpers/git.rb', line 146

def git_filter_shas(stack, extra_cmd, old_rev, new_rev, path=nil, filter_files=[], including=false)
  path ||= git_checkout_path(checkout_root, stack)
  including_shas = []
  excluding_shas = []
  cmd = "cd #{path} && git log --no-merges --name-only --pretty=format:%H #{old_rev}..#{new_rev}"
  cmd = build_git_cmd(cmd, extra_cmd)
  committers = run_cmd(cmd)[:stdout]
  committers.split(/\n\n/).each { |commit|
    lines = commit.split(/\n/)
    commit_sha = lines.shift
    has_filter_file = false
    filter_files.each { |filter_file|
      if !has_filter_file && lines.include?(filter_file)
        has_filter_file = true
      end
    }
    if has_filter_file
      including_shas.push(commit_sha)
      #add to the exclude shas list as well if there are more than one file
      excluding_shas.push(commit_sha) unless lines.length == 1
    else
      excluding_shas.push(commit_sha)
    end
  }
  if including
    return including_shas
  else
    return excluding_shas
  end
end

#git_freshen_clone(stack, extra_cmd = "", path = nil, branch = "master") {|"#{path}"| ... } ⇒ Object

Public: git helper method to bring a local repo up to date with the remote

stack - the stack we want to update the repo for extra_cmd - a command that can be prepended before the actual command path - the path to the repo. This is also passed to the block as

an argument if one is provided

branch - the branch to checkout after the fetch

Returns nothing

Yields:

  • ("#{path}") 


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# File 'lib/deployinator/helpers/git.rb', line 96

def git_freshen_clone(stack, extra_cmd="", path=nil, branch="master")
  path ||= git_checkout_path(checkout_root, stack)
  cmd = "cd #{path} && git fetch --quiet origin +refs/heads/#{branch}:refs/remotes/origin/#{branch} && git reset --hard origin/#{branch} 2>&1"
  cmd = build_git_cmd(cmd, extra_cmd)
  run_cmd cmd
  yield "#{path}" if block_given?
end

#git_freshen_or_clone(stack, extra_cmd, checkout_root, branch = "master", read_write = false) ⇒ Object

Public: wrapper function which can be used to clone a non-existing repo or freshen an existing one. It tests if the path exists and fetches remotes if that’s the case. Otherwise the repo is checked out at the given path.

Examples:

git_freshen_or_clone("web", etsy_qa, "/var/etsy/", "master")

stack - the stack to refresh or clone the repo for extra_cmd - cmd to prepend before the actual command checkout_root - the directory base for the repo location branch - the branch the repo should be on (currently only used

when the repo is refreshed). (default: master)

read_write - boolean; True means clone the repo read/write

Returns stdout of the respective git command.



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# File 'lib/deployinator/helpers/git.rb', line 120

def git_freshen_or_clone(stack, extra_cmd, checkout_root, branch="master", read_write=false)
  path = git_checkout_path(checkout_root, stack)
  is_git = is_git_repo(path, extra_cmd)
  if is_git == :true
    log_and_stream "</br>Refreshing repo #{stack} at #{path}</br>"
    git_freshen_clone(stack, extra_cmd, path, branch)
  elsif is_git == :missing
    log_and_stream "</br>Cloning branch #{branch} of #{stack} repo into #{path}</br>"
    git_clone(stack, git_url(stack, "git", read_write), extra_cmd, checkout_root, branch)
  else
    log_and_stream "</br><span class=\"stderr\">The path for #{stack} at #{path} exists but is not a git repo.</span></br>"
  end
end

#git_head_rev(stack, branch = "master") ⇒ Object

Public: Handles get and store of the head rev from a local file cache. Call this instead of get_git_head_rev.

Paramaters:

stack  - name of the stack for the repo
branch - name of the branch to test

Returns the rev as a string



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# File 'lib/deployinator/helpers/git.rb', line 185

def git_head_rev(stack, branch="master")
  filename = "#{@@rev_head_cache}_#{stack}"
  head_rev = get_from_cache(filename, @@rev_head_cache_ttl)

  unless head_rev
    head_rev = get_git_head_rev(stack, branch)
    File.open(filename, 'w') {|f| f.write(head_rev) }
  end

  return head_rev
end

#git_info_for_stack ⇒ Object 



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# File 'lib/deployinator/helpers/git.rb', line 265

def git_info_for_stack
  if Deployinator.git_info_for_stack
    Deployinator.git_info_for_stack
  else
    {}
  end
end

#git_show_changed_files(rev1, rev2, ssh_cmd, extra = nil, quiet = false) ⇒ Object

Public: list the files that changes between 2 revs

Parameters:

rev1: string of the older rev
rev2: string of the newer rev
ssh_cmd: string ssh cmd to get to a host where you've got this repo checked out
extra: string any extra cmds like cd that you need to do on the remote host to get to your checkout
quiet: boolean - if true we make no additional output and just return the files

Returns:

Array of files names changed between these revs



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# File 'lib/deployinator/helpers/git.rb', line 335

def git_show_changed_files(rev1, rev2, ssh_cmd, extra=nil, quiet=false)
  cmd = %Q{git log --name-only --pretty=oneline --full-index #{rev1}..#{rev2} | grep -vE '^[0-9a-f]{40} ' | sort | uniq}
  extra = "#{extra} &&" unless extra.nil?
  if quiet
    list_of_touched_files = %x{#{ssh_cmd} "#{extra} #{cmd}"}
  else
    list_of_touched_files = run_cmd(%Q{#{ssh_cmd} "#{extra} #{cmd}"})[:stdout]
  end
  return list_of_touched_files.split("\n")
end

#git_url(stack, protocol = "git", read_write = false) ⇒ Object

Public: helper method to build github urls

Example:

git_url('web', 'git', false)

stack - the stack whose github url we want protocol - ‘https’, ‘http’ or ‘git’ read_write - if true then we give back a git url we can push to

Returns string



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# File 'lib/deployinator/helpers/git.rb', line 240

def git_url(stack, protocol="git", read_write=false)
  stack = stack.intern
  repo = git_info_for_stack[stack][:repository]
  github_host = which_github_host(stack)
  repo += ".git" if protocol != "git"
  if (read_write)
    return "git@#{github_host}:#{git_info_for_stack[stack][:user]}/#{repo}"
  else
    return "#{protocol}://#{github_host}/#{git_info_for_stack[stack][:user]}/#{repo}"
  end
end

#github_list_committers(github_commits_param) ⇒ Object 



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# File 'lib/deployinator/helpers/git.rb', line 311

def github_list_committers(github_commits_param)
  commits = {}
  unless github_commits_param.nil?
    github_commits_param.each do |c|
      name = c["commit"]["committer"]["name"]
      sha  = c["sha"]
      message = c["commit"]["message"]
      commits[sha] = { :name => name, :message => message}
    end
  end
  return commits
end

#is_git_repo(path, extra_cmd = "") ⇒ Object

Public: determines whether a given filesystem path is a git repo

path - the path to the directory to test extra_cmd - optional extra_cmd to prepend to the testing command

(default: "")

Examples

is_git_repo('/home/dev/repo')
is_git_repo('/home/dev/repo', 'ssh dev@deployhost')

Returns :true if it is a git repo,

:false if the path exists but is not a git repo,
:missing if the path doesn't exist



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# File 'lib/deployinator/helpers/git.rb', line 286

def is_git_repo(path, extra_cmd="")
  cmd = "#{extra_cmd} test"
  is_dir  = system("#{cmd} -d #{path}")
  is_file = system("#{cmd} -f #{path}")
  is_git  = system("#{cmd} -d #{path}/.git")

  # check possibilities
  if is_dir
    return :true if is_git
    return :false
  elsif is_file
    return :false
  else
    return :missing
  end
end

#use_github_diff ⇒ Object

Public: determine whether we want to use the github diff based on the existence of the stack key in the github info dict

Returns true for existing keys and false otherwise



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# File 'lib/deployinator/helpers/git.rb', line 307

def use_github_diff
  git_info_for_stack.has_key? @stack.to_sym
end

#which_github_host(stack) ⇒ Object

Public: helper method to determine which github hostname to use

Example:

which_github_host('statsd')

stack - the stack for the github host we are looking for

Returns string



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# File 'lib/deployinator/helpers/git.rb', line 260

def which_github_host(stack)
  github_host = git_info_for_stack[stack][:host]
  github_host || Deployinator.github_host
end