added check for docker backend
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@ -118,6 +118,10 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
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errs = packer.MultiErrorAppend(errs, fmt.Errorf("backend: %s must be a valid backend", p.config.Backend))
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}
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if p.config.Backend == "docker" && p.config.Host == "" {
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errs = packer.MultiErrorAppend(errs, fmt.Errorf("backend: host must be specified for docker backend"))
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}
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if p.config.Host == "" {
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p.config.Host = "127.0.0.1"
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}
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