1 files changed, 180 insertions, 0 deletions
diff --git a/pkg/machine/ignition.go b/pkg/machine/ignition.go
new file mode 100644
index 000000000..a68d68ac3
--- /dev/null
+++ b/pkg/machine/ignition.go
@@ -0,0 +1,180 @@
+package machine
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+)
+
+/*
+	If this file gets too nuts, we can perhaps use existing go code
+	to create ignition files.  At this point, the file is so simple
+	that I chose to use structs and not import any code as I was
+	concerned (unsubstantiated) about too much bloat coming in.
+
+	https://github.com/openshift/machine-config-operator/blob/master/pkg/server/server.go
+*/
+
+// Convenience function to convert int to ptr
+func intToPtr(i int) *int {
+	return &i
+}
+
+// Convenience function to convert string to ptr
+func strToPtr(s string) *string {
+	return &s
+}
+
+// Convenience function to convert bool to ptr
+func boolToPtr(b bool) *bool {
+	return &b
+}
+
+func getNodeUsr(usrName string) NodeUser {
+	return NodeUser{Name: &usrName}
+}
+
+func getNodeGrp(grpName string) NodeGroup {
+	return NodeGroup{Name: &grpName}
+}
+
+type DynamicIgnition struct {
+	Name      string
+	Key       string
+	VMName    string
+	WritePath string
+}
+
+// NewIgnitionFile
+func NewIgnitionFile(ign DynamicIgnition) error {
+	if len(ign.Name) < 1 {
+		ign.Name = DefaultIgnitionUserName
+	}
+	ignVersion := Ignition{
+		Version: "3.2.0",
+	}
+
+	ignPassword := Passwd{
+		Users: []PasswdUser{{
+			Name:              ign.Name,
+			SSHAuthorizedKeys: []SSHAuthorizedKey{SSHAuthorizedKey(ign.Key)},
+		}},
+	}
+
+	ignStorage := Storage{
+		Directories: getDirs(ign.Name),
+		Files:       getFiles(ign.Name),
+		Links:       getLinks(ign.Name),
+	}
+
+	// ready is a unit file that sets up the virtual serial device
+	// where when the VM is done configuring, it will send an ack
+	// so a listening host knows it can being interacting with it
+	ready := `[Unit]
+Requires=dev-virtio\\x2dports-%s.device
+OnFailure=emergency.target
+OnFailureJobMode=isolate
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/sh -c '/usr/bin/echo Ready >/dev/%s'
+[Install]
+RequiredBy=multi-user.target
+`
+	_ = ready
+	ignSystemd := Systemd{
+		Units: []Unit{
+			{
+				Enabled: boolToPtr(true),
+				Name:    "podman.socket",
+			},
+			{
+				Enabled:  boolToPtr(true),
+				Name:     "ready.service",
+				Contents: strToPtr(fmt.Sprintf(ready, "vport1p1", "vport1p1")),
+			},
+		}}
+	ignConfig := Config{
+		Ignition: ignVersion,
+		Passwd:   ignPassword,
+		Storage:  ignStorage,
+		Systemd:  ignSystemd,
+	}
+	b, err := json.Marshal(ignConfig)
+	if err != nil {
+		return err
+	}
+	return ioutil.WriteFile(ign.WritePath, b, 0644)
+}
+
+func getDirs(usrName string) []Directory {
+	// Ignition has a bug/feature? where if you make a series of dirs
+	// in one swoop, then the leading dirs are creates as root.
+	newDirs := []string{
+		"/home/" + usrName + "/.config",
+		"/home/" + usrName + "/.config/systemd",
+		"/home/" + usrName + "/.config/systemd/user",
+		"/home/" + usrName + "/.config/systemd/user/default.target.wants",
+	}
+	var (
+		dirs = make([]Directory, len(newDirs))
+	)
+	for i, d := range newDirs {
+		newDir := Directory{
+			Node: Node{
+				Group: getNodeGrp(usrName),
+				Path:  d,
+				User:  getNodeUsr(usrName),
+			},
+			DirectoryEmbedded1: DirectoryEmbedded1{Mode: intToPtr(493)},
+		}
+		dirs[i] = newDir
+	}
+	return dirs
+}
+
+func getFiles(usrName string) []File {
+	var (
+		files []File
+	)
+	// Add a fake systemd service to get the user socket rolling
+	files = append(files, File{
+		Node: Node{
+			Group: getNodeGrp(usrName),
+			Path:  "/home/" + usrName + "/.config/systemd/user/linger-example.service",
+			User:  getNodeUsr(usrName),
+		},
+		FileEmbedded1: FileEmbedded1{
+			Append: nil,
+			Contents: Resource{
+				Source: strToPtr("data:,%5BUnit%5D%0ADescription%3DA%20systemd%20user%20unit%20demo%0AAfter%3Dnetwork-online.target%0AWants%3Dnetwork-online.target%20podman.socket%0A%5BService%5D%0AExecStart%3D%2Fusr%2Fbin%2Fsleep%20infinity%0A"),
+			},
+			Mode: intToPtr(484),
+		},
+	})
+
+	// Add a file into linger
+	files = append(files, File{
+		Node: Node{
+			Group: getNodeGrp(usrName),
+			Path:  "/var/lib/systemd/linger/core",
+			User:  getNodeUsr(usrName),
+		},
+		FileEmbedded1: FileEmbedded1{Mode: intToPtr(420)},
+	})
+	return files
+}
+
+func getLinks(usrName string) []Link {
+	return []Link{{
+		Node: Node{
+			Group: getNodeGrp(usrName),
+			Path:  "/home/" + usrName + "/.config/systemd/user/default.target.wants/linger-example.service",
+			User:  getNodeUsr(usrName),
+		},
+		LinkEmbedded1: LinkEmbedded1{
+			Hard:   boolToPtr(false),
+			Target: "/home/" + usrName + "/.config/systemd/user/linger-example.service",
+		},
+	}}
+}