*: remove support for environment variables

docs/dev/libvirt-howto.md

@@ -223,15 +223,6 @@ Set `TAGS` when building if you need `destroy cluster` support for libvirt; this
 TAGS=libvirt_destroy hack/build.sh
 ```
 
-To avoid being prompted repeatedly, you can set [environment variables](../user/environment-variables.md) to reflect your libvirt choices.  For example, selecting libvirt, setting [our earlier name choices](#pick-names), and telling both the installer and the machine-API operator to contact `libvirtd` at [the usual libvirt IP](#firewall), you can use:
-
-```sh
-export OPENSHIFT_INSTALL_PLATFORM=libvirt
-export OPENSHIFT_INSTALL_BASE_DOMAIN=tt.testing
-export OPENSHIFT_INSTALL_CLUSTER_NAME=test1
-export OPENSHIFT_INSTALL_LIBVIRT_URI=qemu+tcp://192.168.122.1/system
-```
-
 ## Cleanup
 
 If you compiled with `libvirt_destroy`, you can use:

docs/user/tips-and-tricks.md

@@ -0,0 +1,23 @@
+# Tips and Tricks
+
+## Reusing an Install Config
+
+By default, the installer prompts for the necessary information every time a cluster is created. While convenient for one-off cases, this can become tiring if many clusters are needed. The prompts can be bypassed by taking advantage of the installer's notion of [multiple-invocations].
+
+Start by creating an install config and saving it in a cluster-agnostic location:
+
+```console
+openshift-install create install-config --dir=initial
+mv initial/install-config.yml .
+rm -rf initial
+```
+
+Future clusters can then be created by copying that install config into the target directory and then invoking the installer:
+
+```console
+mkdir cluster-0
+cp install-config.yml cluster-0/
+openshift-install create cluster --dir=cluster-0
+```
+
+[multiple-invocations]: overview.md#multiple-invocations

pkg/asset/installconfig/aws/aws.go

@@ -2,7 +2,6 @@
 package aws
 
 import (
-	"encoding/json"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -17,7 +16,6 @@ import (
 	"github.com/sirupsen/logrus"
 	survey "gopkg.in/AlecAivazis/survey.v1"
 
-	"github.com/openshift/installer/pkg/asset"
 	"github.com/openshift/installer/pkg/types/aws"
 )
 
@@ -93,9 +91,10 @@ func Platform() (*aws.Platform, error) {
 
 	sort.Strings(longRegions)
 	sort.Strings(shortRegions)
-	region, err := asset.GenerateUserProvidedAsset(
-		"AWS Region",
-		&survey.Question{
+
+	var region string
+	err = survey.Ask([]*survey.Question{
+		{
 			Prompt: &survey.Select{
 				Message: "Region",
 				Help:    "The AWS region to be used for installation.",
@@ -112,51 +111,40 @@ func Platform() (*aws.Platform, error) {
 			}),
 			Transform: regionTransform,
 		},
-		"OPENSHIFT_INSTALL_AWS_REGION",
-	)
+	}, &region)
 	if err != nil {
 		return nil, err
 	}
 
-	userTags := map[string]string{}
-	if value, ok := os.LookupEnv("_CI_ONLY_STAY_AWAY_OPENSHIFT_INSTALL_AWS_USER_TAGS"); ok {
-		if err := json.Unmarshal([]byte(value), &userTags); err != nil {
-			return nil, errors.Wrapf(err, "_CI_ONLY_STAY_AWAY_OPENSHIFT_INSTALL_AWS_USER_TAGS contains invalid JSON: %s", value)
-		}
-	}
-
 	return &aws.Platform{
 		VPCCIDRBlock: defaultVPCCIDR,
 		Region:       region,
-		UserTags:     userTags,
 	}, nil
 }
 
 func getCredentials() error {
-	keyID, err := asset.GenerateUserProvidedAsset(
-		"AWS Access Key ID",
-		&survey.Question{
+	var keyID string
+	err := survey.Ask([]*survey.Question{
+		{
 			Prompt: &survey.Input{
 				Message: "AWS Access Key ID",
 				Help:    "The AWS access key ID to use for installation (this is not your username).\nhttps://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html",
 			},
 		},
-		"",
-	)
+	}, keyID)
 	if err != nil {
 		return err
 	}
 
-	secretKey, err := asset.GenerateUserProvidedAsset(
-		"AWS Access Key ID",
-		&survey.Question{
+	var secretKey string
+	err = survey.Ask([]*survey.Question{
+		{
 			Prompt: &survey.Password{
 				Message: "AWS Secret Access Key",
 				Help:    "The AWS secret access key corresponding to your access key ID (this is not your password).",
 			},
 		},
-		"",
-	)
+	}, &secretKey)
 	if err != nil {
 		return err
 	}

pkg/asset/installconfig/basedomain.go

@@ -20,9 +20,8 @@ func (a *baseDomain) Dependencies() []asset.Asset {
 
 // Generate queries for the base domain from the user.
 func (a *baseDomain) Generate(asset.Parents) error {
-	bd, err := asset.GenerateUserProvidedAsset(
-		a.Name(),
-		&survey.Question{
+	return survey.Ask([]*survey.Question{
+		{
 			Prompt: &survey.Input{
 				Message: "Base Domain",
 				Help:    "The base domain of the cluster. All DNS records will be sub-domains of this base and will also include the cluster name.\n\nFor AWS, this must be a previously-existing public Route 53 zone.  You can check for any already in your account with:\n\n  $ aws route53 list-hosted-zones --query 'HostedZones[? !(Config.PrivateZone)].Name' --output text",
@@ -31,10 +30,7 @@ func (a *baseDomain) Generate(asset.Parents) error {
 				return validate.DomainName(ans.(string))
 			}),
 		},
-		"OPENSHIFT_INSTALL_BASE_DOMAIN",
-	)
-	a.BaseDomain = bd
-	return err
+	}, &a.BaseDomain)
 }
 
 // Name returns the human-friendly name of the asset.

pkg/asset/installconfig/clustername.go

@@ -20,9 +20,8 @@ func (a *clusterName) Dependencies() []asset.Asset {
 
 // Generate queries for the cluster name from the user.
 func (a *clusterName) Generate(asset.Parents) error {
-	n, err := asset.GenerateUserProvidedAsset(
-		a.Name(),
-		&survey.Question{
+	return survey.Ask([]*survey.Question{
+		{
 			Prompt: &survey.Input{
 				Message: "Cluster Name",
 				Help:    "The name of the cluster.  This will be used when generating sub-domains.\n\nFor libvirt, choose a name that is unique enough to be used as a prefix during cluster deletion.  For example, if you use 'demo' as your cluster name, `openshift-install destroy cluster` may destroy all domains, networks, pools, and volumes that begin with 'demo'.",
@@ -31,10 +30,7 @@ func (a *clusterName) Generate(asset.Parents) error {
 				return validate.DomainName(ans.(string))
 			}),
 		},
-		"OPENSHIFT_INSTALL_CLUSTER_NAME",
-	)
-	a.ClusterName = n
-	return err
+	}, &a.ClusterName)
 }
 
 // Name returns the human-friendly name of the asset.

pkg/asset/installconfig/emailaddress.go

@@ -20,9 +20,8 @@ func (a *emailAddress) Dependencies() []asset.Asset {
 
 // Generate queries for the email address from the user.
 func (a *emailAddress) Generate(asset.Parents) error {
-	email, err := asset.GenerateUserProvidedAsset(
-		a.Name(),
-		&survey.Question{
+	return survey.Ask([]*survey.Question{
+		{
 			Prompt: &survey.Input{
 				Message: "Email Address",
 				Help:    "The email address of the cluster administrator. This will be used to log in to the console.",
@@ -31,10 +30,7 @@ func (a *emailAddress) Generate(asset.Parents) error {
 				return validate.Email(ans.(string))
 			}),
 		},
-		"OPENSHIFT_INSTALL_EMAIL_ADDRESS",
-	)
-	a.EmailAddress = email
-	return err
+	}, &a.EmailAddress)
 }
 
 // Name returns the human-friendly name of the asset.

pkg/asset/installconfig/libvirt/libvirt.go

@@ -5,12 +5,10 @@ import (
 	"context"
 	"fmt"
 	"net/url"
-	"os"
 
 	"github.com/pkg/errors"
 	survey "gopkg.in/AlecAivazis/survey.v1"
 
-	"github.com/openshift/installer/pkg/asset"
 	"github.com/openshift/installer/pkg/rhcos"
 	"github.com/openshift/installer/pkg/types/libvirt"
 )
@@ -22,33 +20,24 @@ const (
 
 // Platform collects libvirt-specific configuration.
 func Platform() (*libvirt.Platform, error) {
-	uri, err := asset.GenerateUserProvidedAsset(
-		"Libvirt Connection URI",
-		&survey.Question{
+	var uri string
+	err := survey.Ask([]*survey.Question{
+		{
 			Prompt: &survey.Input{
 				Message: "Libvirt Connection URI",
 				Help:    "The libvirt connection URI to be used. This must be accessible from the running cluster.",
 				Default: "qemu+tcp://192.168.122.1/system",
 			},
 			Validate: survey.ComposeValidators(survey.Required, uriValidator),
 		},
-		"OPENSHIFT_INSTALL_LIBVIRT_URI",
-	)
+	}, &uri)
 	if err != nil {
 		return nil, err
 	}
 
-	qcowImage, ok := os.LookupEnv("OPENSHIFT_INSTALL_LIBVIRT_IMAGE")
-	if ok {
-		err = validURI(qcowImage)
-		if err != nil {
-			return nil, errors.Wrap(err, "resolve OPENSHIFT_INSTALL_LIBVIRT_IMAGE")
-		}
-	} else {
-		qcowImage, err = rhcos.QEMU(context.TODO(), rhcos.DefaultChannel)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to fetch QEMU image URL")
-		}
+	qcowImage, err := rhcos.QEMU(context.TODO(), rhcos.DefaultChannel)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to fetch QEMU image URL")
 	}
 
 	return &libvirt.Platform{