Adding ssh_config.go

Signed-off-by: Rob Dobson <rob.dobson@citrix.com>

builder/xenserver/common/ssh_config.go

@@ -0,0 +1,48 @@
+package common
+
+import (
+	"errors"
+	"time"
+
+	"github.com/mitchellh/packer/helper/communicator"
+	"github.com/mitchellh/packer/template/interpolate"
+)
+
+type SSHConfig struct {
+	Comm communicator.Config `mapstructure:",squash"`
+
+	SSHHostPortMin    uint `mapstructure:"ssh_host_port_min"`
+	SSHHostPortMax    uint `mapstructure:"ssh_host_port_max"`
+	SSHSkipNatMapping bool `mapstructure:"ssh_skip_nat_mapping"`
+
+	// These are deprecated, but we keep them around for BC
+	// TODO(@mitchellh): remove
+	SSHKeyPath     string        `mapstructure:"ssh_key_path"`
+	SSHWaitTimeout time.Duration `mapstructure:"ssh_wait_timeout"`
+}
+
+func (c *SSHConfig) Prepare(ctx *interpolate.Context) []error {
+	if c.SSHHostPortMin == 0 {
+		c.SSHHostPortMin = 2222
+	}
+
+	if c.SSHHostPortMax == 0 {
+		c.SSHHostPortMax = 4444
+	}
+
+	// TODO: backwards compatibility, write fixer instead
+	if c.SSHKeyPath != "" {
+		c.Comm.SSHPrivateKey = c.SSHKeyPath
+	}
+	if c.SSHWaitTimeout != 0 {
+		c.Comm.SSHTimeout = c.SSHWaitTimeout
+	}
+
+	errs := c.Comm.Prepare(ctx)
+	if c.SSHHostPortMin > c.SSHHostPortMax {
+		errs = append(errs,
+			errors.New("ssh_host_port_min must be less than ssh_host_port_max"))
+	}
+
+	return errs
+}