Quadlet - support oneshot .kube files

Allow users to manually set the Service Type
Add test
Update README

Signed-off-by: Ygal Blum <ygal.blum@gmail.com>

docs/source/markdown/podman-systemd.unit.5.md

@@ -59,6 +59,18 @@ Adding the following snippet to a Quadlet file extends the systemd timeout to 15
 TimeoutStartSec=900
 ```
 
+### Service Type
+
+By default, the `Type` field of the `Service` section of the Quadlet file does not need to be set.
+Quadlet will set it to `notify` for `.container` and `.kube` files and to `oneshot` for `.volume`, `.network` and `.image` files.
+
+However, the value may be explicitly set to `oneshot` for `.container` and `.kube` files when the no containers are expected
+to run once `podman` exits.
+
+Examples for such cases:
+- `.container` file with an image that exit after their entrypoint has finished
+- `.kube` file pointing to a Kubernetes Yaml file that does not define any containers. E.g. PVCs only
+
 ### Enabling unit files
 
 The services created by Podman are considered transient by systemd, which means they don't have the same

pkg/systemd/quadlet/quadlet.go

@@ -1063,9 +1063,17 @@ func ConvertKube(kube *parser.UnitFile, names map[string]string, isUser bool) (*
 	// Need the containers filesystem mounted to start podman
 	service.Add(UnitGroup, "RequiresMountsFor", "%t/containers")
 
-	service.Setv(ServiceGroup,
+	// Allow users to set the Service Type to oneshot to allow resources only kube yaml
-		"Type", "notify",
+	serviceType, ok := service.Lookup(ServiceGroup, "Type")
-		"NotifyAccess", "all")
+	if ok && serviceType != "notify" && serviceType != "oneshot" {
+		return nil, fmt.Errorf("invalid service Type '%s'", serviceType)
+	}
+
+	if serviceType != "oneshot" {
+		service.Setv(ServiceGroup,
+			"Type", "notify",
+			"NotifyAccess", "all")
+	}
 
 	if !kube.HasKey(ServiceGroup, "SyslogIdentifier") {
 		service.Set(ServiceGroup, "SyslogIdentifier", "%N")

test/e2e/quadlet/oneshot.kube

@@ -0,0 +1,19 @@
+## assert-podman-args "kube"
+## assert-podman-args "play"
+## assert-podman-final-args-regex .*/podman_test.*/quadlet/deployment.yml
+## assert-podman-args "--replace"
+## assert-podman-args "--service-container=true"
+## assert-podman-stop-post-args "kube"
+## assert-podman-stop-post-args "down"
+## assert-podman-stop-post-final-args-regex .*/podman_test.*/quadlet/deployment.yml
+## assert-key-is "Unit" "RequiresMountsFor" "%t/containers"
+## assert-key-is "Service" "KillMode" "mixed"
+## assert-key-is "Service" "Type" "oneshot"
+## assert-key-is "Service" "Environment" "PODMAN_SYSTEMD_UNIT=%n"
+## assert-key-is "Service" "SyslogIdentifier" "%N"
+
+[Kube]
+Yaml=deployment.yml
+
+[Service]
+Type=oneshot

test/e2e/quadlet_test.go

@@ -764,6 +764,7 @@ BOGUS=foo
 		Entry("Kube - Working Directory already in Service", "workingdir-service.kube", 0, ""),
 		Entry("Kube - global args", "globalargs.kube", 0, ""),
 		Entry("Kube - Containers Conf Modules", "containersconfmodule.kube", 0, ""),
+		Entry("Kube - Service Type=oneshot", "oneshot.kube", 0, ""),
 
 		Entry("Network - Basic", "basic.network", 0, ""),
 		Entry("Network - Disable DNS", "disable-dns.network", 0, ""),