introduce podman machine

podman machine allows podman to create, manage, and interact with a vm
running some form of linux (default is fcos).  podman is then configured
to be able to interact with the vm automatically.

while this is usable on linux, the real push is to get this working on
both current apple architectures in macos.

Ashley Cui contributed to this PR and was a great help.

[NO TESTS NEEDED]

Signed-off-by: baude <bbaude@redhat.com>

1 files changed, 151 insertions, 0 deletions

diff --git a/pkg/machine/ignition.go b/pkg/machine/ignition.go
new file mode 100644
index 000000000..ff79d5afb
--- /dev/null
+++ b/pkg/machine/ignition.go
@@ -0,0 +1,151 @@
+package machine
+
+import (
+	"encoding/json"
+	"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}
+}
+
+// NewIgnitionFile
+func NewIgnitionFile(name, key, writePath string) error {
+	if len(name) < 1 {
+		name = DefaultIgnitionUserName
+	}
+	ignVersion := Ignition{
+		Version: "3.2.0",
+	}
+
+	ignPassword := Passwd{
+		Users: []PasswdUser{{
+			Name:              name,
+			SSHAuthorizedKeys: []SSHAuthorizedKey{SSHAuthorizedKey(key)},
+		}},
+	}
+
+	ignStorage := Storage{
+		Directories: getDirs(name),
+		Files:       getFiles(name),
+		Links:       getLinks(name),
+	}
+	ignSystemd := Systemd{
+		Units: []Unit{
+			{
+				Enabled: boolToPtr(true),
+				Name:    "podman.socket",
+			}}}
+
+	ignConfig := Config{
+		Ignition: ignVersion,
+		Passwd:   ignPassword,
+		Storage:  ignStorage,
+		Systemd:  ignSystemd,
+	}
+	b, err := json.Marshal(ignConfig)
+	if err != nil {
+		return err
+	}
+	return ioutil.WriteFile(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",
+		},
+	}}
+}