Add artifact quadlet unit type support

RFE: Add artifact quadlet unit type #25778

Signed-off-by: Odilon Sousa <osousa@redhat.com>

Author: Odilhao

cmd/quadlet/main.go

@@ -396,6 +396,8 @@ func generateUnitsInfoMap(units []*parser.UnitFile) map[string]*quadlet.UnitInfo
 			// types), but still breaks the dependency cycle between .volume and .build ([Volume] can
 			// have Image=some.build, and [Build] can have Volume=some.volume:/some-volume)
 			resourceName = quadlet.GetBuiltImageName(unit)
+		case strings.HasSuffix(unit.Filename, ".artifact"):
+			serviceName = quadlet.GetArtifactServiceName(unit)
 		case strings.HasSuffix(unit.Filename, ".pod"):
 			containers = make([]string, 0)
 			// Prefill resouceNames for .pod files.
@@ -550,6 +552,9 @@ func process() bool {
 			service, err = quadlet.ConvertImage(unit, unitsInfoMap, isUserFlag)
 		case strings.HasSuffix(unit.Filename, ".build"):
 			service, warnings, err = quadlet.ConvertBuild(unit, unitsInfoMap, isUserFlag)
+		case strings.HasSuffix(unit.Filename, ".artifact"):
+			warnIfAmbiguousName(unit, quadlet.ArtifactGroup)
+			service, err = quadlet.ConvertArtifact(unit, unitsInfoMap, isUserFlag)
 		case strings.HasSuffix(unit.Filename, ".pod"):
 			service, warnings, err = quadlet.ConvertPod(unit, unit.Filename, unitsInfoMap, isUserFlag)
 		default:

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

@@ -6,7 +6,7 @@ podman\-systemd.unit - systemd units using Podman Quadlet
 
 ## SYNOPSIS
 
-*name*.container, *name*.volume, *name*.network, *name*.kube *name*.image, *name*.build *name*.pod
+*name*.container, *name*.volume, *name*.network, *name*.kube *name*.image, *name*.build *name*.pod, *name*.artifact
 
 ### Podman rootful unit search path
 
@@ -48,7 +48,7 @@ the [Service] table and [Install] tables pass directly to systemd and are handle
 See systemd.unit(5) man page for more information.
 
 The Podman generator reads the search paths above and reads files with the extensions `.container`
-`.volume`, `.network`, `.build`, `.pod` and `.kube`, and for each file generates a similarly named `.service` file. Be aware that
+`.volume`, `.network`, `.build`, `.pod`, `.kube`, and `.artifact`, and for each file generates a similarly named `.service` file. Be aware that
 existing vendor services (i.e., in `/usr/`) are replaced if they have the same name. The generated unit files can
 be started and managed with `systemctl` like any other systemd service. `systemctl {--user} list-unit-files`
 lists existing unit files on the system.
@@ -104,7 +104,7 @@ Quadlet requires the use of cgroup v2, use `podman info --format {{.Host.Cgroups
 
 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,
-`forking` for `.pod` files, and `oneshot` for `.volume`, `.network`, `.build`, and `.image` files.
+`forking` for `.pod` files, and `oneshot` for `.volume`, `.network`, `.build`, `.image`, and `.artifact` files.
 
 However, `Type` may be explicitly set to `oneshot` for `.container` and `.kube` files when no containers are expected
 to run once `podman` exits.
@@ -2091,6 +2091,123 @@ Override the default architecture variant of the container image.
 
 This is equivalent to the Podman `--variant` option.
 
+## Artifact units [Artifact]
+
+### WARNING: Experimental Unit
+
+This unit is considered experimental and still in development. Inputs, options, and outputs are all subject to change.
+
+Artifact units are named with a `.artifact` extension and contain a `[Artifact]` section describing
+the container artifact pull command. The generated service is a one-time command that ensures that the artifact
+exists on the host, pulling it if needed.
+
+Using artifact units allows containers to depend on artifacts being automatically pulled. This is
+particularly useful for managing artifacts that containers need to mount or access, the **Artifact** key is mandatory inside of the [Artifact] unit.
+
+Valid options for `[Artifact]` are listed below:
+
+| **[Artifact] options**                      | **podman artifact pull equivalent**                    |
+|---------------------------------------------|--------------------------------------------------------|
+| Artifact=quay\.io/foobar/artifact:special   | podman artifact pull quay\.io/foobar/artifact:special  |
+| AuthFile=/etc/registry/auth\.json           | --authfile=/etc/registry/auth\.json                    |
+| CertDir=/etc/registry/certs                 | --cert-dir=/etc/registry/certs                         |
+| ContainersConfModule=/etc/nvd\.conf         | --module=/etc/nvd\.conf                                |
+| Creds=username:password                     | --creds=username:password                              |
+| DecryptionKey=/etc/registry\.key            | --decryption-key=/etc/registry\.key                    |
+| GlobalArgs=--log-level=debug                | --log-level=debug                                      |
+| PodmanArgs=--pull never                     | --pull never                                           |
+| Quiet=true                                  | --quiet                                                |
+| Retry=5                                     | --retry=5                                              |
+| RetryDelay=10s                              | --retry-delay=10s                                      |
+| ServiceName=my-artifact                     | Set the systemd service name to my-artifact.service   |
+| TLSVerify=false                             | --tls-verify=false                                     |
+
+### `Artifact=`
+
+The artifact to pull from a registry onto the local machine. This is the only required key for artifact units.
+
+It is required to use a fully qualified artifact name rather than a short name, both for
+performance and robustness reasons.
+
+### `AuthFile=`
+
+Path of the authentication file.
+
+This is equivalent to the Podman `--authfile` option.
+
+### `CertDir=`
+
+Use certificates at path (*.crt, *.cert, *.key) to connect to the registry.
+
+This is equivalent to the Podman `--cert-dir` option.
+
+### `ContainersConfModule=`
+
+Load the specified containers.conf(5) module. Equivalent to the Podman `--module` option.
+
+This key can be listed multiple times.
+
+### `Creds=`
+
+The credentials to use when contacting the registry in the format `[username[:password]]`.
+
+This is equivalent to the Podman `--creds` option.
+
+### `DecryptionKey=`
+
+The `[key[:passphrase]]` to be used for decryption of artifacts.
+
+This is equivalent to the Podman `--decryption-key` option.
+
+### `GlobalArgs=`
+
+This key contains a list of arguments passed directly between `podman` and `artifact`
+in the generated file. It can be used to access Podman features otherwise unsupported by the generator. Since the generator is unaware
+of what unexpected interactions can be caused by these arguments, it is not recommended to use
+this option.
+
+The format of this is a space separated list of arguments, which can optionally be individually
+escaped to allow inclusion of whitespace and other control characters.
+
+This key can be listed multiple times.
+
+### `PodmanArgs=`
+
+This key contains a list of arguments passed directly to the end of the `podman artifact pull` command
+in the generated file (right before the artifact name in the command line). It can be used to
+access Podman features otherwise unsupported by the generator. Since the generator is unaware
+of what unexpected interactions can be caused by these arguments, it is not recommended to use
+this option.
+
+The format of this is a space separated list of arguments, which can optionally be individually
+escaped to allow inclusion of whitespace and other control characters.
+
+This key can be listed multiple times.
+
+### `Quiet=`
+
+Suppress output information when pulling artifacts.
+
+This is equivalent to the Podman `--quiet` option.
+
+### `Retry=`
+
+Number of times to retry the artifact pull when a HTTP error occurs. Equivalent to the Podman `--retry` option.
+
+### `RetryDelay=`
+
+Delay between retries. Equivalent to the Podman `--retry-delay` option.
+
+### `ServiceName=`
+
+The (optional) name of the systemd service. If this is not specified, the default value is the same name as the unit, but with a `-artifact` suffix, i.e. a `$name.artifact` file creates a `$name-artifact.service` systemd service.
+
+### `TLSVerify=`
+
+Require HTTPS and verification of certificates when contacting registries.
+
+This is equivalent to the Podman `--tls-verify` option.
+
 ## Quadlet section [Quadlet]
 Some quadlet specific configuration is shared between different unit types. Those settings
 can be configured in the `[Quadlet]` section.
@@ -2195,6 +2312,29 @@ IPRange=172.16.0.0/28
 Label=org.test.Key=value
 ```
 
+Example `test.artifact` to only pull the artifact using one auth file:
+```
+[Artifact]
+Artifact=quay.io/example/my-artifact:latest
+AuthFile=/etc/registry/auth.json
+TLSVerify=false
+```
+
+Example usage where a container depends on an artifact:
+
+`my-artifact.artifact`:
+```
+[Artifact]
+Artifact=quay.io/example/my-config:latest
+```
+
+`my-app.container`:
+```
+[Container]
+Image=quay.io/example/my-app:latest
+Mount=type=artifact,source=my-artifact.artifact,destination=/etc/config
+```
+
 Example for Container in a Pod:
 
 `test.pod`

pkg/systemd/quadlet/quadlet.go

@@ -27,6 +27,7 @@ const (
 	UnitDirDistro = "/usr/share/containers/systemd"
 
 	// Names of commonly used systemd/quadlet group names
+	ArtifactGroup   = "Artifact"
 	ContainerGroup  = "Container"
 	InstallGroup    = "Install"
 	KubeGroup       = "Kube"
@@ -38,6 +39,7 @@ const (
 	ImageGroup      = "Image"
 	BuildGroup      = "Build"
 	QuadletGroup    = "Quadlet"
+	XArtifactGroup  = "X-Artifact"
 	XContainerGroup = "X-Container"
 	XKubeGroup      = "X-Kube"
 	XNetworkGroup   = "X-Network"
@@ -61,6 +63,7 @@ const (
 	KeyAllTags               = "AllTags"
 	KeyAnnotation            = "Annotation"
 	KeyArch                  = "Arch"
+	KeyArtifact              = "Artifact"
 	KeyAuthFile              = "AuthFile"
 	KeyAutoUpdate            = "AutoUpdate"
 	KeyCertDir               = "CertDir"
@@ -141,6 +144,7 @@ const (
 	KeyPolicy                = "Policy"
 	KeyPublishPort           = "PublishPort"
 	KeyPull                  = "Pull"
+	KeyQuiet                 = "Quiet"
 	KeyReadOnly              = "ReadOnly"
 	KeyReadOnlyTmpfs         = "ReadOnlyTmpfs"
 	KeyReloadCmd             = "ReloadCmd"
@@ -458,6 +462,25 @@ var (
 				KeyVolume:               true,
 			},
 		},
+		ArtifactGroup: {
+			GroupName:  ArtifactGroup,
+			XGroupName: XArtifactGroup,
+			SupportedKeys: map[string]bool{
+				KeyArtifact:             true,
+				KeyAuthFile:             true,
+				KeyCertDir:              true,
+				KeyContainersConfModule: true,
+				KeyCreds:                true,
+				KeyDecryptionKey:        true,
+				KeyGlobalArgs:           true,
+				KeyPodmanArgs:           true,
+				KeyQuiet:                true,
+				KeyRetry:                true,
+				KeyRetryDelay:           true,
+				KeyServiceName:          true,
+				KeyTLSVerify:            true,
+			},
+		},
 		PodGroup: {
 			GroupName:  PodGroup,
 			XGroupName: XPodGroup,
@@ -1464,6 +1487,8 @@ func GetUnitServiceName(unit *parser.UnitFile) (string, error) {
 		return GetImageServiceName(unit), nil
 	case strings.HasSuffix(unit.Filename, ".build"):
 		return GetBuildServiceName(unit), nil
+	case strings.HasSuffix(unit.Filename, ".artifact"):
+		return GetArtifactServiceName(unit), nil
 	case strings.HasSuffix(unit.Filename, ".pod"):
 		return GetPodServiceName(unit), nil
 	default:
@@ -1495,6 +1520,10 @@ func GetBuildServiceName(podUnit *parser.UnitFile) string {
 	return getServiceName(podUnit, BuildGroup, "-build")
 }
 
+func GetArtifactServiceName(podUnit *parser.UnitFile) string {
+	return getServiceName(podUnit, ArtifactGroup, "-artifact")
+}
+
 func GetPodServiceName(podUnit *parser.UnitFile) string {
 	return getServiceName(podUnit, PodGroup, "-pod")
 }
@@ -1871,7 +1900,7 @@ func handleStorageSource(quadletUnitFile, serviceUnitFile *parser.UnitFile, sour
 	if source[0] == '/' {
 		// Absolute path
 		serviceUnitFile.Add(UnitGroup, "RequiresMountsFor", source)
-	} else if strings.HasSuffix(source, ".volume") || (checkImage && strings.HasSuffix(source, ".image")) {
+	} else if strings.HasSuffix(source, ".volume") || (checkImage && strings.HasSuffix(source, ".image")) || strings.HasSuffix(source, ".artifact") {
 		sourceUnitInfo, ok := unitsInfoMap[source]
 		if !ok {
 			return "", fmt.Errorf("requested Quadlet source %s was not found", source)
@@ -2040,10 +2069,11 @@ func resolveContainerMountParams(containerUnitFile, serviceUnitFile *parser.Unit
 
 	// Source resolution is required only for these types of mounts
 	sourceResultionRequired := map[string]struct{}{
-		"volume": {},
-		"bind":   {},
-		"glob":   {},
-		"image":  {},
+		"volume":   {},
+		"bind":     {},
+		"glob":     {},
+		"image":    {},
+		"artifact": {},
 	}
 	if _, ok := sourceResultionRequired[mountType]; !ok {
 		return mount, nil
@@ -2297,3 +2327,47 @@ func initServiceUnitFile(quadletUnitFile *parser.UnitFile, isUser bool, unitsInf
 
 	return service, unitInfo, nil
 }
+
+func ConvertArtifact(artifact *parser.UnitFile, unitsInfoMap map[string]*UnitInfo, isUser bool) (*parser.UnitFile, error) {
+	service, unitInfo, err := initServiceUnitFile(artifact, isUser, unitsInfoMap, ArtifactGroup)
+	if err != nil {
+		return nil, err
+	}
+
+	artifactName, ok := artifact.Lookup(ArtifactGroup, KeyArtifact)
+	if !ok || len(artifactName) == 0 {
+		return nil, fmt.Errorf("no Artifact key specified")
+	}
+
+	podman := createBasePodmanCommand(artifact, ArtifactGroup)
+
+	podman.add("artifact", "pull")
+
+	stringKeys := map[string]string{
+		KeyAuthFile:      "--authfile",
+		KeyCertDir:       "--cert-dir",
+		KeyCreds:         "--creds",
+		KeyDecryptionKey: "--decryption-key",
+		KeyRetry:         "--retry",
+		KeyRetryDelay:    "--retry-delay",
+	}
+	lookupAndAddString(artifact, ArtifactGroup, stringKeys, podman)
+
+	boolKeys := map[string]string{
+		KeyQuiet:     "--quiet",
+		KeyTLSVerify: "--tls-verify",
+	}
+	lookupAndAddBoolean(artifact, ArtifactGroup, boolKeys, podman)
+
+	handlePodmanArgs(artifact, ArtifactGroup, podman)
+
+	podman.add(artifactName)
+
+	service.AddCmdline(ServiceGroup, "ExecStart", podman.Args)
+
+	defaultOneshotServiceGroup(service, true)
+
+	unitInfo.ResourceName = artifactName
+
+	return service, nil
+}

pkg/systemd/quadlet/quadlet_common.go

@@ -4,6 +4,7 @@ var (
 	// Key: Extension
 	// Value: Processing order for resource naming dependencies
 	SupportedExtensions = map[string]int{
+		".artifact":  1,
 		".container": 4,
 		".volume":    2,
 		".kube":      4,

test/e2e/quadlet/artifact-mount.container

@@ -0,0 +1,24 @@
+## assert-podman-final-args localhost/imagename
+## assert-podman-args "--name" "systemd-%N"
+## assert-podman-args "--mount"
+## assert-podman-args "type=artifact,source=quay.io/libpod/testartifact:20250206-single,destination=/artifacts"
+## assert-podman-args "--rm"
+## assert-podman-args "--replace"
+## assert-podman-args "-d"
+## assert-podman-args "--cgroups=split"
+## assert-podman-args "--sdnotify=conmon"
+## assert-key-is "Unit" "RequiresMountsFor" "%t/containers"
+## assert-key-is "Service" "KillMode" "mixed"
+## assert-key-is "Service" "Delegate" "yes"
+## assert-key-is "Service" "Type" "notify"
+## assert-key-is "Service" "NotifyAccess" "all"
+## assert-key-is "Service" "SyslogIdentifier" "%N"
+## assert-key-is-regex "Service" "ExecStopPost" "-[/S].*/podman rm -v -f -i systemd-%N"
+## assert-key-is-regex "Service" "ExecStop" ".*/podman rm -v -f -i systemd-%N"
+## assert-key-is "Service" "Environment" "PODMAN_SYSTEMD_UNIT=%n"
+## assert-key-is-regex "Unit" "After" "network-online.target|podman-user-wait-network-online.service"
+## assert-key-is-regex "Unit" "Wants" "network-online.target|podman-user-wait-network-online.service"
+
+[Container]
+Image=localhost/imagename
+Mount=type=artifact,source=quay.io/libpod/testartifact:20250206-single,destination=/artifacts

test/e2e/quadlet/basic.artifact

@@ -0,0 +1,10 @@
+## assert-podman-final-args quay.io/libpod/testartifact:20250206-single
+## assert-podman-args "artifact"
+## assert-podman-args "pull"
+## assert-key-is "Service" "Type" "oneshot"
+## assert-key-is "Service" "RemainAfterExit" "yes"
+## assert-key-is-regex "Unit" "After" "network-online.target|podman-user-wait-network-online.service"
+## assert-key-is-regex "Unit" "Wants" "network-online.target|podman-user-wait-network-online.service"
+
+[Artifact]
+Artifact=quay.io/libpod/testartifact:20250206-single