Puppet definition to download a tarball of a Github repo and extract it to a filesystem location.

github_dlextract.pp

# example:
#
# github_dlextract { "mxcl/homebrew",
#   path => "/my/path/directory",
#   rev => "b8c7e203d1", # optional
# }


define github_dlextract ($repo = $title, $path, $rev = 'master') {
  file { $path: 
		ensure => directory,
	}
	$reporepl = regsubst($repo, '\/', '-')
	$inst_marker_file = "/var/db/.puppet_github_${reporepl}_${rev}"

	exec { "github_dlextract-${repo}":
		command => "curl -kL https://github.com/${repo}/tarball/${rev} | tar xzf - && cp -pR ${reporepl}-*/ ${path} && rm -rf /tmp/${reporepl}-*",
		cwd => "/tmp",
		path => ["/bin", "/sbin", "/usr/bin", "/usr/sbin"],
		refreshonly => $rev ? {
			'master' => false,
			default  => true},
		subscribe => File[$inst_marker_file],
		require => File[$path],
	}

	if $rev == 'master' {
		exec { "github_dlextract-delmarker-${repo}":
			command => "rm -f /var/db/.puppet_github_${reporepl}_*",
			path => ["/bin", "/sbin", "/usr/bin", "/usr/sbin"],
			onlyif => "ls /var/db/.puppet_github_${reporepl}_*"
		}
	}

	file { $inst_marker_file:
		ensure => $rev ? {
			'master' => absent,
			default  => present},
	}
}