*: provide a default OS image for libvirt

Documentation/dev/libvirt-howto.md

@@ -16,7 +16,9 @@ git clone https://github.com/openshift/installer.git
 cd installer
 ```
 
-#### 1.3 Download and prepare the operating system image
+#### 1.3 (Optional) Download and prepare the operating system image
+
+*By default, the installer will download the latest RHCOS image every time it is invoked. This may be problematic for users who create a large number of clusters or who have limited network bandwidth. The installer allows a local image to be used instead.*
 
 Download the latest RHCOS image (you will need access to the Red Hat internal build systems):
 
@@ -85,14 +87,14 @@ iptables -I INPUT -p tcp -s 192.168.124.0/24 -d 192.168.124.1 --dport 16509 \
 
 #### 1.7 Prepare the configuration file
 1. `cp examples/libvirt.yaml ./`
-1. Edit the configuration file:
+2. Edit the configuration file:
     1. Set an email and password in the `admin` section
-    1. Set a `baseDomain` (to `tt.testing`)
-    1. Set the `sshKey` in the `admin` section to the **contents** of an ssh key (e.g. `ssh-rsa AAAA...`)
-    1. Set the `imagePath` to the **absolute** path of the operating system image you downloaded
-    1. Set the `name` (e.g. test1)
-    1. Look at the `podCIDR` and `serviceCIDR` fields in the `networking` section. Make sure they don't conflict with anything important.
-    1. Set the `pullSecret` to your JSON pull secret.
+    2. Set a `baseDomain` (to `tt.testing`)
+    3. Set the `sshKey` in the `admin` section to the **contents** of an ssh key (e.g. `ssh-rsa AAAA...`)
+    4. Set the `name` (e.g. test1)
+    5. Look at the `podCIDR` and `serviceCIDR` fields in the `networking` section. Make sure they don't conflict with anything important.
+    6. Set the `pullSecret` to your JSON pull secret.
+    7. (Optional) Change the `image` to the file URL of the operating system image you downloaded (e.g. `file:///home/user/Downloads/rhcos.qcow`). This will allow the installer to re-use that image instead of having to download it every time.
 
 #### 1.8 Set up NetworkManager DNS overlay
 This step is optional, but useful for being able to resolve cluster-internal hostnames from your host.

examples/libvirt.yaml

@@ -19,7 +19,7 @@ libvirt:
     name: tectonic
     ifName: tt0
     ipRange: 192.168.124.0/24
-  imagePath: /path/to/image
+  image: http://aos-ostree.rhev-ci-vms.eng.rdu2.redhat.com/rhcos/images/cloud/latest/rhcos-qemu.qcow2.gz
 
 ca:
   # (optional) The content of the PEM-encoded CA certificate, used to generate Tectonic Console's server certificate.

installer/pkg/config-generator/generator.go

@@ -248,10 +248,12 @@ func (c *ConfigGenerator) installConfig() (*types.InstallConfig, error) {
 			},
 		}
 		masterPlatform.Libvirt = &types.LibvirtMachinePoolPlatform{
-			QCOWImagePath: c.Libvirt.QCOWImagePath,
+			ImagePool:   "default",
+			ImageVolume: "coreos_base",
 		}
 		workerPlatform.Libvirt = &types.LibvirtMachinePoolPlatform{
-			QCOWImagePath: c.Libvirt.QCOWImagePath,
+			ImagePool:   "default",
+			ImageVolume: "coreos_base",
 		}
 	default:
 		return nil, fmt.Errorf("installconfig: invalid platform %s", c.Platform)

installer/pkg/config/libvirt/libvirt.go

@@ -14,12 +14,12 @@ const (
 
 // Libvirt encompasses configuration specific to libvirt.
 type Libvirt struct {
-	URI           string `json:"tectonic_libvirt_uri,omitempty" yaml:"uri"`
-	QCOWImagePath string `json:"tectonic_coreos_qcow_path,omitempty" yaml:"imagePath"`
-	Network       `json:",inline" yaml:"network"`
-	MasterIPs     []string `json:"tectonic_libvirt_master_ips,omitempty" yaml:"masterIPs"`
-	WorkerIPs     []string `json:"tectonic_libvirt_worker_ips,omitempty" yaml:"workerIPs"`
-	BootstrapIP   string   `json:"tectonic_libvirt_bootstrap_ip,omitempty" yaml:"bootstrapIP"`
+	URI         string `json:"tectonic_libvirt_uri,omitempty" yaml:"uri"`
+	Image       string `json:"tectonic_os_image,omitempty" yaml:"image"`
+	Network     `json:",inline" yaml:"network"`
+	MasterIPs   []string `json:"tectonic_libvirt_master_ips,omitempty" yaml:"masterIPs"`
+	WorkerIPs   []string `json:"tectonic_libvirt_worker_ips,omitempty" yaml:"workerIPs"`
+	BootstrapIP string   `json:"tectonic_libvirt_bootstrap_ip,omitempty" yaml:"bootstrapIP"`
 }
 
 // Network describes a libvirt network configuration.

installer/pkg/config/validate.go

@@ -19,10 +19,6 @@ const (
 	maxS3BucketNameLength = 63
 )
 
-var (
-	qcowMagic = []byte{'Q', 'F', 'I', 0xfb}
-)
-
 // ErrUnmatchedNodePool is returned when a nodePool was specified but not found in the nodePools list.
 type ErrUnmatchedNodePool struct {
 	name string
@@ -160,9 +156,6 @@ func (c *Cluster) validateLibvirt() []error {
 	if err := validate.PrefixError("libvirt uri", validate.NonEmpty(c.Libvirt.URI)); err != nil {
 		errs = append(errs, err)
 	}
-	if err := validate.PrefixError("libvirt imagePath is not a valid QCOW image", validate.FileHeader(c.Libvirt.QCOWImagePath, qcowMagic)); err != nil {
-		errs = append(errs, err)
-	}
 	if err := validate.PrefixError("libvirt network name", validate.NonEmpty(c.Libvirt.Network.Name)); err != nil {
 		errs = append(errs, err)
 	}

installer/pkg/config/validate_test.go

@@ -1,7 +1,6 @@
 package config
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -444,21 +443,6 @@ func TestValidateIgnitionFiles(t *testing.T) {
 }
 
 func TestValidateLibvirt(t *testing.T) {
-	fValid, err := ioutil.TempFile("", "qcow")
-	if err != nil {
-		t.Fatalf("failed to create temporary file: %v", err)
-	}
-	if _, err := fValid.Write(qcowMagic); err != nil {
-		t.Fatalf("failed to write to temporary file: %v", err)
-	}
-	fValid.Close()
-	defer os.Remove(fValid.Name())
-	fInvalid, err := ioutil.TempFile("", "qcow")
-	if err != nil {
-		t.Fatalf("failed to create temporary file: %v", err)
-	}
-	fInvalid.Close()
-	defer os.Remove(fInvalid.Name())
 	cases := []struct {
 		cluster Cluster
 		err     bool
@@ -474,24 +458,9 @@ func TestValidateLibvirt(t *testing.T) {
 		{
 			cluster: Cluster{
 				Libvirt: libvirt.Libvirt{
-					Network:       libvirt.Network{},
-					QCOWImagePath: "",
-					URI:           "",
-				},
-				Networking: defaultCluster.Networking,
-			},
-			err: true,
-		},
-		{
-			cluster: Cluster{
-				Libvirt: libvirt.Libvirt{
-					Network: libvirt.Network{
-						Name:    "tectonic",
-						IfName:  libvirt.DefaultIfName,
-						IPRange: "10.0.1.0/24",
-					},
-					QCOWImagePath: fInvalid.Name(),
-					URI:           "baz",
+					Network: libvirt.Network{},
+					Image:   "",
+					URI:     "",
 				},
 				Networking: defaultCluster.Networking,
 			},
@@ -505,8 +474,8 @@ func TestValidateLibvirt(t *testing.T) {
 						IfName:  libvirt.DefaultIfName,
 						IPRange: "10.0.1.0/24",
 					},
-					QCOWImagePath: fValid.Name(),
-					URI:           "baz",
+					Image: "file:///foo",
+					URI:   "baz",
 				},
 				Networking: defaultCluster.Networking,
 			},
@@ -520,8 +489,8 @@ func TestValidateLibvirt(t *testing.T) {
 						IfName:  libvirt.DefaultIfName,
 						IPRange: "10.2.1.0/24",
 					},
-					QCOWImagePath: fValid.Name(),
-					URI:           "baz",
+					Image: "file:///foo",
+					URI:   "baz",
 				},
 				Networking: defaultCluster.Networking,
 			},
@@ -535,8 +504,8 @@ func TestValidateLibvirt(t *testing.T) {
 						IfName:  libvirt.DefaultIfName,
 						IPRange: "x",
 					},
-					QCOWImagePath: "foo",
-					URI:           "baz",
+					Image: "file:///foo",
+					URI:   "baz",
 				},
 				Networking: defaultCluster.Networking,
 			},
@@ -550,12 +519,12 @@ func TestValidateLibvirt(t *testing.T) {
 						IfName:  libvirt.DefaultIfName,
 						IPRange: "192.168.0.1/24",
 					},
-					QCOWImagePath: "foo",
-					URI:           "baz",
+					Image: "file:///foo",
+					URI:   "baz",
 				},
 				Networking: defaultCluster.Networking,
 			},
-			err: true,
+			err: false,
 		},
 	}
 

installer/pkg/validate/validate.go

@@ -1,7 +1,6 @@
 package validate
 
 import (
-	"bytes"
 	"crypto/x509"
 	"encoding/json"
 	"encoding/pem"
@@ -469,19 +468,3 @@ func lastIP(cidr *net.IPNet) net.IP {
 	}
 	return last
 }
-
-// FileHeader validates that the file at the specified path begins with the given string.
-func FileHeader(path string, header []byte) error {
-	f, err := os.Open(path)
-	if err != nil {
-		return err
-	}
-	buf := make([]byte, len(header))
-	if _, err := f.Read(buf); err != nil {
-		return err
-	}
-	if !bytes.Equal(buf, header) {
-		return fmt.Errorf("file %q does not begin with %q", path, string(header))
-	}
-	return nil
-}

installer/pkg/validate/validate_test.go

@@ -610,52 +610,3 @@ func TestFileExists(t *testing.T) {
 		}
 	}
 }
-
-func TestFileHeader(t *testing.T) {
-	cases := []struct {
-		actual   []byte
-		expected []byte
-		err      bool
-	}{
-		{
-			actual:   []byte{},
-			expected: []byte("foo"),
-			err:      true,
-		},
-		{
-			actual:   []byte("foo"),
-			expected: []byte("bar"),
-			err:      true,
-		},
-		{
-			actual:   []byte("fooooo"),
-			expected: []byte("foo"),
-			err:      false,
-		},
-		{
-			actual:   []byte("fooooo"),
-			expected: []byte{},
-			err:      false,
-		},
-	}
-
-	for i, c := range cases {
-		f, err := ioutil.TempFile("", "fileheader")
-		if err != nil {
-			t.Errorf("test case %d: failed to create temporary file: %v", i, err)
-			continue
-		}
-		if _, err := f.Write(c.actual); err != nil {
-			t.Errorf("test case %d: failed to write to temporary file: %v", i, err)
-		}
-		f.Close()
-		if err := validate.FileHeader(f.Name(), c.expected); (err != nil) != c.err {
-			no := "no"
-			if c.err {
-				no = "an"
-			}
-			t.Errorf("test case %d: expected %s error, got %v", i, no, err)
-		}
-		os.Remove(f.Name())
-	}
-}

modules/libvirt/volume/main.tf

@@ -1,5 +1,4 @@
-# Create a QCOW volume from the downloaded path
 resource "libvirt_volume" "coreos_base" {
   name   = "coreos_base"
-  source = "file://${var.coreos_qcow_path}"
+  source = "file://${var.image}"
 }

modules/libvirt/volume/variables.tf

@@ -1,4 +1,4 @@
-variable "coreos_qcow_path" {
-  description = "The path on disk to the coreos disk image"
+variable "image" {
+  description = "The URL of the OS disk image"
   type        = "string"
 }

pkg/types/machinepools.go

@@ -50,6 +50,10 @@ type EC2RootVolume struct {
 // LibvirtMachinePoolPlatform stores the configuration for a machine pool
 // installed on libvirt.
 type LibvirtMachinePoolPlatform struct {
-	// QCOWImagePath
-	QCOWImagePath string `json:"qcowImagePath"`
+	// ImagePool is the name of the libvirt storage pool to which the storage
+	// volume containing the OS image belongs.
+	ImagePool string `json:"imagePool"`
+	// ImageVolume is the name of the libvirt storage volume containing the OS
+	// image.
+	ImageVolume string `json:"imageVolume"`
 }

steps/infra/libvirt/main.tf

@@ -5,7 +5,7 @@ provider "libvirt" {
 module "libvirt_base_volume" {
   source = "../../../modules/libvirt/volume"
 
-  coreos_qcow_path = "${var.tectonic_coreos_qcow_path}"
+  image = "${var.tectonic_os_image}"
 }
 
 resource "libvirt_volume" "master" {

steps/variables-libvirt.tf

@@ -18,9 +18,9 @@ variable "tectonic_libvirt_ip_range" {
   description = "IP range for the libvirt machines"
 }
 
-variable "tectonic_coreos_qcow_path" {
+variable "tectonic_os_image" {
   type        = "string"
-  description = "path to a Red Hat CoreOS qcow image"
+  description = "The URL of the OS disk image"
 }
 
 variable "tectonic_libvirt_bootstrap_ip" {

tests/run.sh

@@ -101,7 +101,7 @@ python <<-EOF >"${CLUSTER_NAME}.yaml"
 	        config['aws']['master']['iamRoleName'] = 'tf-tectonic-master-node'
 	        config['aws']['worker']['iamRoleName'] = 'tf-tectonic-worker-node'
 	elif '${BACKEND}' == 'libvirt':
-	    config['libvirt']['imagePath'] = '${IMAGE_PATH}'
+	    config['libvirt']['image'] = 'file://${IMAGE_PATH}'
 	yaml.safe_dump(config, sys.stdout)
 	EOF