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require 'formula'
require 'set'
class FormulaInstaller
@@attempted = Set.new
def initialize
@install_deps = true
end
attr_writer :install_deps
def expand_deps f
deps = []
f.deps.collect do |dep|
dep = Formula.factory dep
deps += expand_deps dep
deps << dep
end
deps
end
def pyerr dep
brew_pip = ' brew install pip &&' unless Formula.factory('pip').installed?
<<-EOS
Unsatisfied dependency, #{dep}
Homebrew does not provide formula for Python dependencies, pip does:
#{brew_pip} pip install #{dep}
EOS
end
def plerr dep; <<-EOS
Unsatisfied dependency, #{dep}
Homebrew does not provide formula for Perl dependencies, cpan does:
cpan -i #{dep}
EOS
end
def rberr dep; <<-EOS
Unsatisfied dependency "#{dep}"
Homebrew does not provide formulae for Ruby dependencies, rubygems does:
gem install #{dep}
EOS
end
def check_external_deps f
return unless f.external_deps
f.external_deps[:python].each do |dep|
raise pyerr(dep) unless quiet_system "/usr/bin/env", "python", "-c", "import #{dep}"
end
f.external_deps[:perl].each do |dep|
raise plerr(dep) unless quiet_system "/usr/bin/env", "perl", "-e", "use '#{dep}'"
end
f.external_deps[:ruby].each do |dep|
raise rberr(dep) unless quiet_system "/usr/bin/env", "ruby", "-rubygems", "-e", "require '#{dep}'"
end
end
def check_formula_deps f
expand_deps(f).each do |dep|
begin
install_private dep unless dep.installed?
rescue
#TODO continue if this is an optional dep
raise
end
end
end
def install f
if @install_deps
check_external_deps f
check_formula_deps f
end
install_private f
end
private
def install_private f
return if @@attempted.include? f.name
@@attempted << f.name
# 1. formulae can modify ENV, so we must ensure that each
# installation has a pristine ENV when it starts, forking now is
# the easiest way to do this
# 2. formulae have access to __END__ the only way to allow this is
# to make the formula script the executed script
read, write = IO.pipe
# I'm guessing this is not a good way to do this, but I'm no UNIX guru
ENV['HOMEBREW_ERROR_PIPE'] = write.to_i.to_s
begin #watch_out_for_spill do #disabled temporarily, see Issue #124
fork do
begin
read.close
exec '/usr/bin/nice', '/usr/bin/ruby', '-I', File.dirname(__FILE__), '-rinstall', f.path, '--', *ARGV.options
rescue => e
Marshal.dump(e, write)
write.close
exit! 1
end
end
ignore_interrupts do # because child proc will get it and marshall it back
write.close
Process.wait
data = read.read
raise Marshal.load(data) unless data.nil? or data.empty?
raise "Suspicious installation failure" unless $?.success?
end
end
end
end
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