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37a56fa513
FormulaInstaller now attempts to take a lock on a "foo.brewing" file for the formula and all of its dependencies before attempting installation. The lock is an advisory lock implemented using flock(), and as such it only locks out other processes that attempt to take the lock. It also means that it is never necessary to manually remove the lock file, because the lock is not enforced by I/O. The uninstall, link, and unlink commands all learn to respect this lock as well, so that the installation cannot be corrupted by a concurrent Homebrew process, and keg operations cannot occur simultaneously.
66 lines
1.3 KiB
Ruby
66 lines
1.3 KiB
Ruby
require 'ostruct'
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module Homebrew extend self
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def link
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raise KegUnspecifiedError if ARGV.named.empty?
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if Process.uid.zero? and not File.stat(HOMEBREW_BREW_FILE).uid.zero?
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raise "Cowardly refusing to `sudo brew link'\n#{SUDO_BAD_ERRMSG}"
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end
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mode = OpenStruct.new
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mode.overwrite = true if ARGV.include? '--overwrite'
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mode.dry_run = true if ARGV.dry_run?
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ARGV.kegs.each do |keg|
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if keg.linked?
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opoo "Already linked: #{keg}"
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puts "To relink: brew unlink #{keg.fname} && brew link #{keg.fname}"
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next
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end
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if mode.dry_run and mode.overwrite
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print "Would remove:\n" do
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keg.link(mode)
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end
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next
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elsif mode.dry_run
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print "Would link:\n" do
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keg.link(mode)
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end
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next
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end
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keg.lock do
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print "Linking #{keg}... " do
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puts "#{keg.link(mode)} symlinks created"
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end
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end
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end
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end
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private
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# Allows us to ensure a puts happens before the block exits so that if say,
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# an exception is thrown, its output starts on a new line.
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def print str, &block
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Kernel.print str
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puts_capture = Class.new do
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def self.puts str
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$did_puts = true
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Kernel.puts str
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end
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end
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puts_capture.instance_eval &block
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ensure
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puts unless $did_puts
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end
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end
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