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