Re-adding support for bypassing ISO upload and just using and attaching one already present on an available SR.

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

builder/xenserver/common/step_find_vdi.go

@@ -17,6 +17,11 @@ func (self *StepFindVdi) Run(state multistep.StateBag) multistep.StepAction {
 	ui := state.Get("ui").(packer.Ui)
 	client := state.Get("client").(xsclient.XenAPIClient)
 
+    // Ignore if VdiName is not specified
+    if self.VdiName == "" {
+        return multistep.ActionContinue
+    }
+
 	vdis, err := client.GetVdiByNameLabel(self.VdiName)
 
 	switch {

builder/xenserver/common/step_upload_vdi.go

@@ -11,7 +11,7 @@ import (
 )
 
 type StepUploadVdi struct {
-	VdiName       string
+	VdiNameFunc   func() string
 	ImagePathFunc func() string
 	VdiUuidKey    string
 }
@@ -22,12 +22,13 @@ func (self *StepUploadVdi) Run(state multistep.StateBag) multistep.StepAction {
 	client := state.Get("client").(xsclient.XenAPIClient)
 
 	imagePath := self.ImagePathFunc()
+    vdiName := self.VdiNameFunc()
 	if imagePath == "" {
 		// skip if no disk image to attach
 		return multistep.ActionContinue
 	}
 
-	ui.Say(fmt.Sprintf("Step: Upload VDI '%s'", self.VdiName))
+	ui.Say(fmt.Sprintf("Step: Upload VDI '%s'", vdiName))
 
 	// Create VDI for the image
 	sr, err := config.GetSR(client)
@@ -52,15 +53,15 @@ func (self *StepUploadVdi) Run(state multistep.StateBag) multistep.StepAction {
 	fileLength := fstat.Size()
 
 	// Create the VDI
-	vdi, err := sr.CreateVdi(self.VdiName, fileLength)
+	vdi, err := sr.CreateVdi(vdiName, fileLength)
 	if err != nil {
-		ui.Error(fmt.Sprintf("Unable to create VDI '%s': %s", self.VdiName, err.Error()))
+		ui.Error(fmt.Sprintf("Unable to create VDI '%s': %s", vdiName, err.Error()))
 		return multistep.ActionHalt
 	}
 
 	vdiUuid, err := vdi.GetUuid()
 	if err != nil {
-		ui.Error(fmt.Sprintf("Unable to get UUID of VDI '%s': %s", self.VdiName, err.Error()))
+		ui.Error(fmt.Sprintf("Unable to get UUID of VDI '%s': %s", vdiName, err.Error()))
 		return multistep.ActionHalt
 	}
 	state.Put(self.VdiUuidKey, vdiUuid)
@@ -83,6 +84,8 @@ func (self *StepUploadVdi) Cleanup(state multistep.StateBag) {
 	ui := state.Get("ui").(packer.Ui)
 	client := state.Get("client").(xsclient.XenAPIClient)
 
+    vdiName := self.VdiNameFunc()
+
 	if config.ShouldKeepVM(state) {
 		return
 	}
@@ -119,7 +122,7 @@ func (self *StepUploadVdi) Cleanup(state multistep.StateBag) {
 		ui.Error(fmt.Sprintf("Can't destroy VDI '%s': %s", vdiUuid, err.Error()))
 		return
 	}
-	ui.Say(fmt.Sprintf("Destroyed VDI '%s'", self.VdiName))
+	ui.Say(fmt.Sprintf("Destroyed VDI '%s'", vdiName))
 
 	state.Put(self.VdiUuidKey, "")
 }

builder/xenserver/iso/builder.go

@@ -27,6 +27,7 @@ type config struct {
 	ISOChecksumType string   `mapstructure:"iso_checksum_type"`
 	ISOUrls         []string `mapstructure:"iso_urls"`
 	ISOUrl          string   `mapstructure:"iso_url"`
+    ISOName         string   `mapstructure:"iso_name"`
 
 	PlatformArgs map[string]string `mapstructure:"platform_args"`
 
@@ -95,6 +96,7 @@ func (self *Builder) Prepare(raws ...interface{}) (params []string, retErr error
 		"iso_checksum":      &self.config.ISOChecksum,
 		"iso_checksum_type": &self.config.ISOChecksumType,
 		"iso_url":           &self.config.ISOUrl,
+        "iso_name":          &self.config.ISOName,
 		"install_timeout":   &self.config.RawInstallTimeout,
 	}
 	for i := range self.config.ISOUrls {
@@ -117,6 +119,10 @@ func (self *Builder) Prepare(raws ...interface{}) (params []string, retErr error
 			errs, fmt.Errorf("Failed to parse install_timeout: %s", err))
 	}
 
+    if self.config.ISOName == "" {
+
+        // If ISO name is not specified, assume a URL and checksum has been provided.
+
         if self.config.ISOChecksumType == "" {
             errs = packer.MultiErrorAppend(
                 errs, errors.New("The iso_checksum_type must be specified."))
@@ -157,6 +163,11 @@ func (self *Builder) Prepare(raws ...interface{}) (params []string, retErr error
                     errs, fmt.Errorf("Failed to parse iso_urls[%d]: %s", i, err))
             }
         }
+    } else {
+
+        // An ISO name has been provided. It should be attached from an available SR.
+
+    }
 
 	if len(errs.Errors) > 0 {
 		retErr = errors.New(errs.Error())
@@ -190,7 +201,7 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 	httpReqChan := make(chan string, 1)
 
 	//Build the steps
-	steps := []multistep.Step{
+    download_steps := []multistep.Step{
 		&common.StepDownload{
 			Checksum:     self.config.ISOChecksum,
 			ChecksumType: self.config.ISOChecksumType,
@@ -198,6 +209,9 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 			ResultKey:    "iso_path",
 			Url:          self.config.ISOUrls,
 		},
+    }
+
+	steps := []multistep.Step{
 		&xscommon.StepPrepareOutputDir{
 			Force: self.config.PackerForce,
 			Path:  self.config.OutputDir,
@@ -209,7 +223,9 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 			Chan: httpReqChan,
 		},
 		&xscommon.StepUploadVdi{
-			VdiName: "Packer-floppy-disk",
+			VdiNameFunc: func() string {
+                return "Packer-floppy-disk"
+            },
 			ImagePathFunc: func() string {
 				if floppyPath, ok := state.GetOk("floppy_path"); ok {
 					return floppyPath.(string)
@@ -219,9 +235,17 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 			VdiUuidKey: "floppy_vdi_uuid",
 		},
 		&xscommon.StepUploadVdi{
-			VdiName: path.Base(self.config.ISOUrls[0]),
+            VdiNameFunc: func() string {
+                if len(self.config.ISOUrls) > 0 {
+                    return path.Base(self.config.ISOUrls[0])
+                }
+                return ""
+            },
 			ImagePathFunc: func() string {
-				return state.Get("iso_path").(string)
+                if isoPath, ok := state.GetOk("iso_path"); ok {
+                    return isoPath.(string)
+                }
+                return ""
 			},
 			VdiUuidKey: "iso_vdi_uuid",
 		},
@@ -229,6 +253,10 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 			VdiName:    self.config.ToolsIsoName,
 			VdiUuidKey: "tools_vdi_uuid",
 		},
+        &xscommon.StepFindVdi{
+            VdiName:    self.config.ISOName,
+            VdiUuidKey: "isoname_vdi_uuid",
+        },
 		new(stepCreateInstance),
 		&xscommon.StepAttachVdi{
 			VdiUuidKey: "floppy_vdi_uuid",
@@ -238,6 +266,10 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 			VdiUuidKey: "iso_vdi_uuid",
 			VdiType:    xsclient.CD,
 		},
+        &xscommon.StepAttachVdi{
+            VdiUuidKey: "isoname_vdi_uuid",
+            VdiType:    xsclient.CD,
+        },
 		&xscommon.StepAttachVdi{
 			VdiUuidKey: "tools_vdi_uuid",
 			VdiType:    xsclient.CD,
@@ -293,6 +325,11 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 		new(xscommon.StepExport),
 	}
 
+    if self.config.ISOName == "" {
+        steps = append(download_steps, steps...)
+    }
+
+
 	self.runner = &multistep.BasicRunner{Steps: steps}
 	self.runner.Run(state)
 

builder/xenserver/xva/builder.go

@@ -127,7 +127,9 @@ func (self *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (pa
 		},
 		new(xscommon.StepHTTPServer),
 		&xscommon.StepUploadVdi{
-			VdiName: "Packer-floppy-disk",
+			VdiNameFunc: func() string {
+                return "Packer-floppy-disk"
+            },
 			ImagePathFunc: func() string {
 				if floppyPath, ok := state.GetOk("floppy_path"); ok {
 					return floppyPath.(string)