46 lines
819 B
Ruby
46 lines
819 B
Ruby
require "fcntl"
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class FormulaLock
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LOCKDIR = HOMEBREW_CACHE_FORMULA
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def initialize(name)
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@name = name
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@path = LOCKDIR.join("#{@name}.brewing")
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@lockfile = nil
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end
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def lock
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LOCKDIR.mkpath
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@lockfile = get_or_create_lockfile
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unless @lockfile.flock(File::LOCK_EX | File::LOCK_NB)
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raise OperationInProgressError, @name
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end
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end
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def unlock
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unless @lockfile.nil? || @lockfile.closed?
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@lockfile.flock(File::LOCK_UN)
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@lockfile.close
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end
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end
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def with_lock
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lock
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yield
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ensure
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unlock
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end
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private
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def get_or_create_lockfile
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if @lockfile.nil? || @lockfile.closed?
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@lockfile = @path.open(File::RDWR | File::CREAT)
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@lockfile.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
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@lockfile
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else
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@lockfile
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end
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end
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end
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