Add machine init --run-playbook

Allow the user to provide an Ansible playbook file on init which will
then be run on boot.

Signed-off-by: Jake Correnti <[email protected]>
Signed-off-by: Brent Baude <[email protected]>

Author: jakecorrenti

cmd/podman/machine/init.go

@@ -62,6 +62,10 @@ func init() {
 	)
 	_ = initCmd.RegisterFlagCompletionFunc(cpusFlagName, completion.AutocompleteNone)
 
+	runPlaybookFlagName := "run-playbook"
+	flags.StringVar(&initOpts.PlaybookPath, runPlaybookFlagName, "", "Run an Ansible playbook after first boot")
+	_ = initCmd.RegisterFlagCompletionFunc(runPlaybookFlagName, completion.AutocompleteDefault)
+
 	diskSizeFlagName := "disk-size"
 	flags.Uint64Var(
 		&initOpts.DiskSize,

docs/source/markdown/podman-machine-init.1.md.in

@@ -80,6 +80,8 @@ is copied into the user's CONF_DIR and renamed.  Additionally, no SSH keys are g
 Fully qualified registry, path, or URL to a VM image.
 Registry target must be in the form of `docker://registry/repo/image:version`.
 
+Note: Only images provided by podman will be supported.
+
 #### **--memory**, **-m**=*number*
 
 Memory (in MiB). Note: 1024MiB = 1GiB.
@@ -96,6 +98,14 @@ if there is no existing remote connection configurations.
 
 API forwarding, if available, follows this setting.
 
+#### **--run-playbook**
+
+Add the provided Ansible playbook to the machine and execute it after the first boot.
+
+Note: The playbook will be executed with the same privileges given to the user in the virtual machine. The playbook provided cannot include other files from the host system, as they will not be copied.
+Use of the `--run-playbook` flag will require the image to include Ansible. The default image provided will have Ansible included.
+
+
 #### **--timezone**
 
 Set the timezone for the machine and containers.  Valid values are `local` or

pkg/machine/define/initopts.go

@@ -3,6 +3,7 @@ package define
 import "net/url"
 
 type InitOptions struct {
+	PlaybookPath       string
 	CPUS               uint64
 	DiskSize           uint64
 	IgnitionPath       string

pkg/machine/e2e/config_init_test.go

@@ -11,19 +11,21 @@ import (
 
 type initMachine struct {
 	/*
-	      --cpus uint              Number of CPUs (default 1)
-	      --disk-size uint         Disk size in GiB (default 100)
-	      --ignition-path string   Path to ignition file
-	      --username string        Username of the remote user (default "core" for FCOS, "user" for Fedora)
-	      --image-path string      Path to bootable image (default "testing")
-	  -m, --memory uint            Memory in MiB (default 2048)
-	      --now                    Start machine now
-	      --rootful                Whether this machine should prefer rootful container execution
-	      --timezone string        Set timezone (default "local")
-	  -v, --volume stringArray     Volumes to mount, source:target
-	      --volume-driver string   Optional volume driver
+			      --cpus uint              Number of CPUs (default 1)
+			      --disk-size uint         Disk size in GiB (default 100)
+			      --ignition-path string   Path to ignition file
+			      --username string        Username of the remote user (default "core" for FCOS, "user" for Fedora)
+			      --image-path string      Path to bootable image (default "testing")
+			  -m, --memory uint            Memory in MiB (default 2048)
+			      --now                    Start machine now
+			      --rootful                Whether this machine should prefer rootful container execution
+		          --run-playbook string    Run an ansible playbook after first boot
+			      --timezone string        Set timezone (default "local")
+			  -v, --volume stringArray     Volumes to mount, source:target
+			      --volume-driver string   Optional volume driver
 
 	*/
+	playbook           string
 	cpus               *uint
 	diskSize           *uint
 	ignitionPath       string
@@ -73,6 +75,9 @@ func (i *initMachine) buildCmd(m *machineTestBuilder) []string {
 	if i.rootful {
 		cmd = append(cmd, "--rootful")
 	}
+	if l := len(i.playbook); l > 0 {
+		cmd = append(cmd, "--run-playbook", i.playbook)
+	}
 	if i.userModeNetworking {
 		cmd = append(cmd, "--user-mode-networking")
 	}
@@ -152,6 +157,11 @@ func (i *initMachine) withRootful(r bool) *initMachine {
 	return i
 }
 
+func (i *initMachine) withRunPlaybook(p string) *initMachine {
+	i.playbook = p
+	return i
+}
+
 func (i *initMachine) withUserModeNetworking(r bool) *initMachine { //nolint:unused
 	i.userModeNetworking = r
 	return i

pkg/machine/e2e/init_test.go

@@ -98,6 +98,50 @@ var _ = Describe("podman machine init", func() {
 		}
 	})
 
+	It("run playbook", func() {
+		str := randomString()
+
+		// ansible playbook file to create a text file containing a random string
+		playbookContents := fmt.Sprintf(`- name: Simple podman machine example
+  hosts: localhost
+  tasks:
+    - name: create a file
+      ansible.builtin.copy:
+        dest: /home/core/foobar.txt
+        content: "%s\n"`, str)
+
+		playbookPath := filepath.Join(GinkgoT().TempDir(), "playbook.yaml")
+
+		// create the playbook file
+		playbookFile, err := os.Create(playbookPath)
+		Expect(err).ToNot(HaveOccurred())
+		defer playbookFile.Close()
+
+		// write the desired contents into the file
+		_, err = playbookFile.WriteString(playbookContents)
+		Expect(err).To(Not(HaveOccurred()))
+
+		name := randomString()
+		i := new(initMachine)
+		session, err := mb.setName(name).setCmd(i.withImage(mb.imagePath).withRunPlaybook(playbookPath).withNow()).run()
+		Expect(err).ToNot(HaveOccurred())
+		Expect(session).To(Exit(0))
+
+		// ensure the contents of the playbook file didn't change when getting copied
+		ssh := new(sshMachine)
+		sshSession, err := mb.setName(name).setCmd(ssh.withSSHCommand([]string{"cat", "playbook.yaml"})).run()
+		Expect(err).ToNot(HaveOccurred())
+		Expect(sshSession).To(Exit(0))
+		Expect(sshSession.outputToStringSlice()).To(Equal(strings.Split(playbookContents, "\n")))
+
+		// output the contents of the file generated by the playbook
+		sshSession, err = mb.setName(name).setCmd(ssh.withSSHCommand([]string{"cat", "foobar.txt"})).run()
+		Expect(err).ToNot(HaveOccurred())
+
+		// check its the same as the random number or string that we generated
+		Expect(sshSession.outputToString()).To(Equal(str))
+	})
+
 	It("simple init with start", func() {
 		i := initMachine{}
 		session, err := mb.setCmd(i.withImage(mb.imagePath)).run()

pkg/machine/ignition/ignition.go

@@ -5,6 +5,7 @@ package ignition
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"io/fs"
 	"net/url"
 	"os"
@@ -685,6 +686,56 @@ done
 `
 }
 
+func (i *IgnitionBuilder) AddPlaybook(input *os.File, destPath string, username string) error {
+	// read the config file to a string
+	s, err := io.ReadAll(input)
+	if err != nil {
+		return fmt.Errorf("read playbook: %w", err)
+	}
+
+	// create the ignition file object
+	f := File{
+		Node: Node{
+			Group: GetNodeGrp(username),
+			Path:  destPath,
+			User:  GetNodeUsr(username),
+		},
+		FileEmbedded1: FileEmbedded1{
+			Append: nil,
+			Contents: Resource{
+				Source: EncodeDataURLPtr(string(s)),
+			},
+			Mode: IntToPtr(0744),
+		},
+	}
+
+	// call ignitionBuilder.WithFile
+	// add the config file to the ignition object
+	i.WithFile(f)
+
+	unit := parser.NewUnitFile()
+	unit.Add("Unit", "After", "ready.service")
+	unit.Add("Service", "Type", "oneshot")
+	unit.Add("Service", "User", username)
+	unit.Add("Service", "Group", username)
+	unit.Add("Service", "ExecStart", fmt.Sprintf("ansible-playbook %s", destPath))
+	unit.Add("Install", "WantedBy", "default.target")
+	unitContents, err := unit.ToString()
+	if err != nil {
+		return err
+	}
+
+	// create a systemd service
+	playbookUnit := Unit{
+		Enabled:  BoolToPtr(true),
+		Name:     "playbook.service",
+		Contents: &unitContents,
+	}
+	i.WithUnit(playbookUnit)
+
+	return nil
+}
+
 func GetNetRecoveryUnitFile() *parser.UnitFile {
 	recoveryUnit := parser.NewUnitFile()
 	recoveryUnit.Add("Unit", "Description", "Verifies health of network and recovers if necessary")

pkg/machine/shim/host.go

@@ -207,6 +207,19 @@ func Init(opts machineDefine.InitOptions, mp vmconfigs.VMProvider) error {
 		}
 	}
 
+	if len(opts.PlaybookPath) > 0 {
+		f, err := os.Open(opts.PlaybookPath)
+		if err != nil {
+			return err
+		}
+
+		playbookDest := fmt.Sprintf("/home/%s/%s", userName, "playbook.yaml")
+		err = ignBuilder.AddPlaybook(f, playbookDest, userName)
+		if err != nil {
+			return err
+		}
+	}
+
 	readyIgnOpts, err := mp.PrepareIgnition(mc, &ignBuilder)
 	if err != nil {
 		return err