image,manifest: add support for user customization (well, not really)

This adds support for being able to add user customization. In
practise we can only handle adding root user key(s) for now until
we have more discussion about how to support adding users in a
bootc supported way.

This support for keys is essential to allow testing the images
without play gustfish or similar tricks (which is hard on a
bootc deploy because bootc will bind mount the deploy `etc`
over the `sysroot/etc` on first boot so anything we do on the
root of the disk will not work for /etc (/root/.authorized_keys
might work actually maybe?).

pkg/image/bootc_disk.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/osbuild/images/pkg/artifact"
 	"github.com/osbuild/images/pkg/container"
+	"github.com/osbuild/images/pkg/customizations/users"
 	"github.com/osbuild/images/pkg/disk"
 	"github.com/osbuild/images/pkg/manifest"
 	"github.com/osbuild/images/pkg/osbuild"
@@ -21,6 +22,10 @@ type BootcDiskImage struct {
 	Platform       platform.Platform
 	PartitionTable *disk.PartitionTable
 
+	// This is a bit of a lie, only root and it's ssh key is supported
+	// today because that is all that bootc gives us by default.
+	Users []users.User
+
 	Filename string
 
 	ContainerSource *container.SourceSpec
@@ -61,6 +66,7 @@ func (img *BootcDiskImage) InstantiateManifestFromContainers(m *manifest.Manifes
 	// and very basic user (root only?) should be supported
 	baseImage := manifest.NewRawBootcImage(buildPipeline, containers, img.Platform)
 	baseImage.PartitionTable = img.PartitionTable
+	baseImage.Users = img.Users
 
 	switch imgFormat {
 	case platform.FORMAT_QCOW2:

pkg/manifest/raw_bootc.go

@@ -1,8 +1,11 @@
 package manifest
 
 import (
+	"fmt"
+
 	"github.com/osbuild/images/pkg/artifact"
 	"github.com/osbuild/images/pkg/container"
+	"github.com/osbuild/images/pkg/customizations/users"
 	"github.com/osbuild/images/pkg/disk"
 	"github.com/osbuild/images/pkg/osbuild"
 	"github.com/osbuild/images/pkg/ostree"
@@ -25,6 +28,10 @@ type RawBootcImage struct {
 	// tree, with `bootc install to-filesystem` we can only work
 	// with the image itself
 	PartitionTable *disk.PartitionTable
+
+	// This is a bit of a lie, only root and it's ssh key is supported
+	// today because that is all that bootc gives us by default.
+	Users []users.User
 }
 
 func (p RawBootcImage) Filename() string {
@@ -77,18 +84,29 @@ func (p *RawBootcImage) serialize() osbuild.Pipeline {
 		panic("no partition table in live image")
 	}
 
+	if len(p.Users) > 1 {
+		panic(fmt.Sprintf("raw bootc image only supports a single root key for user customization, got %v", p.Users))
+	}
+	if len(p.Users) == 1 && p.Users[0].Name != "root" {
+		panic(fmt.Sprintf("raw bootc image only supports the root user, got %v", p.Users))
+	}
+
 	for _, stage := range osbuild.GenImagePrepareStages(pt, p.filename, osbuild.PTSfdisk) {
 		pipeline.AddStage(stage)
 	}
 
+	opts := &osbuild.BootcInstallToFilesystemOptions{}
+	if len(p.Users) == 1 && p.Users[0].Key != nil {
+		opts.RootSSHAuthorizedKeys = *p.Users[0].Key
+	}
 	inputs := osbuild.ContainerDeployInputs{
 		Images: osbuild.NewContainersInputForSources(p.containerSpecs),
 	}
 	devices, mounts, err := osbuild.GenBootupdDevicesMounts(p.filename, p.PartitionTable)
 	if err != nil {
 		panic(err)
 	}
-	st, err := osbuild.NewBootcInstallToFilesystemStage(inputs, devices, mounts)
+	st, err := osbuild.NewBootcInstallToFilesystemStage(opts, inputs, devices, mounts)
 	if err != nil {
 		panic(err)
 	}

pkg/osbuild/bootc_install_to_filesystem_stage.go

@@ -4,6 +4,15 @@ import (
 	"fmt"
 )
 
+type BootcInstallToFilesystemOptions struct {
+	// options for --root-ssh-authorized-keys
+	RootSSHAuthorizedKeys string `json:"root-ssh-authorized-keys"`
+	// options for --karg
+	Kargs []string `json:"kargs"`
+}
+
+func (BootcInstallToFilesystemOptions) isStageOptions() {}
+
 // NewBootcInstallToFilesystem creates a new stage for the
 // org.osbuild.bootc.install-to-filesystem stage.
 //
@@ -12,7 +21,7 @@ import (
 // bootc/bootupd find and install all required bootloader bits.
 //
 // The mounts input should be generated with GenBootupdDevicesMounts.
-func NewBootcInstallToFilesystemStage(inputs ContainerDeployInputs, devices map[string]Device, mounts []Mount) (*Stage, error) {
+func NewBootcInstallToFilesystemStage(options *BootcInstallToFilesystemOptions, inputs ContainerDeployInputs, devices map[string]Device, mounts []Mount) (*Stage, error) {
 	if err := validateBootupdMounts(mounts); err != nil {
 		return nil, err
 	}
@@ -23,6 +32,7 @@ func NewBootcInstallToFilesystemStage(inputs ContainerDeployInputs, devices map[
 
 	return &Stage{
 		Type:    "org.osbuild.bootc.install-to-filesystem",
+		Options: options,
 		Inputs:  inputs,
 		Devices: devices,
 		Mounts:  mounts,

pkg/osbuild/bootc_install_to_filesystem_stage_test.go

@@ -31,11 +31,12 @@ func TestBootcInstallToFilesystemStageNewHappy(t *testing.T) {
 
 	expectedStage := &osbuild.Stage{
 		Type:    "org.osbuild.bootc.install-to-filesystem",
+		Options: (*osbuild.BootcInstallToFilesystemOptions)(nil),
 		Inputs:  inputs,
 		Devices: devices,
 		Mounts:  mounts,
 	}
-	stage, err := osbuild.NewBootcInstallToFilesystemStage(inputs, devices, mounts)
+	stage, err := osbuild.NewBootcInstallToFilesystemStage(nil, inputs, devices, mounts)
 	require.Nil(t, err)
 	assert.Equal(t, stage, expectedStage)
 }
@@ -45,7 +46,7 @@ func TestBootcInstallToFilesystemStageNewNoContainers(t *testing.T) {
 	mounts := makeOsbuildMounts("/", "/boot", "/boot/efi")
 	inputs := osbuild.ContainerDeployInputs{}
 
-	_, err := osbuild.NewBootcInstallToFilesystemStage(inputs, devices, mounts)
+	_, err := osbuild.NewBootcInstallToFilesystemStage(nil, inputs, devices, mounts)
 	assert.EqualError(t, err, "expected exactly one container input but got: 0 (map[])")
 }
 
@@ -61,7 +62,7 @@ func TestBootcInstallToFilesystemStageNewTwoContainers(t *testing.T) {
 		},
 	}
 
-	_, err := osbuild.NewBootcInstallToFilesystemStage(inputs, devices, mounts)
+	_, err := osbuild.NewBootcInstallToFilesystemStage(nil, inputs, devices, mounts)
 	assert.EqualError(t, err, "expected exactly one container input but got: 2 (map[1:{} 2:{}])")
 }
 
@@ -70,7 +71,7 @@ func TestBootcInstallToFilesystemStageMissingMounts(t *testing.T) {
 	mounts := makeOsbuildMounts("/")
 	inputs := makeFakeContainerInputs()
 
-	stage, err := osbuild.NewBootcInstallToFilesystemStage(inputs, devices, mounts)
+	stage, err := osbuild.NewBootcInstallToFilesystemStage(nil, inputs, devices, mounts)
 	// XXX: rename error
 	assert.ErrorContains(t, err, "required mounts for bootupd stage [/boot /boot/efi] missing")
 	require.Nil(t, stage)
@@ -81,7 +82,7 @@ func TestBootcInstallToFilesystemStageJsonHappy(t *testing.T) {
 	mounts := makeOsbuildMounts("/", "/boot", "/boot/efi")
 	inputs := makeFakeContainerInputs()
 
-	stage, err := osbuild.NewBootcInstallToFilesystemStage(inputs, devices, mounts)
+	stage, err := osbuild.NewBootcInstallToFilesystemStage(nil, inputs, devices, mounts)
 	require.Nil(t, err)
 	stageJson, err := json.MarshalIndent(stage, "", "  ")
 	require.Nil(t, err)
@@ -98,6 +99,7 @@ func TestBootcInstallToFilesystemStageJsonHappy(t *testing.T) {
       }
     }
   },
+  "options": null,
   "devices": {
     "dev-for-/": {
       "type": "org.osbuild.loopback"