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7615d3a812
Consolidate the handling of which directories need to exist and which need to be writable. Additionally, add a fatal check for formula installations to ensure that any directories that need to be writable are so before attempting an installation. Fixes #4626.
52 lines
903 B
Ruby
52 lines
903 B
Ruby
require "fcntl"
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class LockFile
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attr_reader :path
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def initialize(name)
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@name = name.to_s
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@path = HOMEBREW_LOCKS/"#{@name}.lock"
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@lockfile = nil
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end
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def lock
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@path.parent.mkpath
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create_lockfile
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return if @lockfile.flock(File::LOCK_EX | File::LOCK_NB)
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raise OperationInProgressError, @name
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end
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def unlock
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return if @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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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 create_lockfile
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return unless @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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end
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end
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class FormulaLock < LockFile
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def initialize(name)
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super("#{name}.formula")
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end
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end
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class CaskLock < LockFile
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def initialize(name)
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super("#{name}.cask")
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end
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end
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