Add support for Entrypoint in quadlet

This PR closes #20585

Add Inital support for Entrypoint on quadlets
Add Bats Tests for Entrypoint
Updates the documentation with one example to use the Entrypoint option

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

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

@@ -168,6 +168,7 @@ Valid options for `[Container]` are listed below:
 | Environment=foo=bar                  | --env foo=bar                                        |
 | EnvironmentFile=/tmp/env             | --env-file /tmp/env                                  |
 | EnvironmentHost=true                 | --env-host                                           |
+| Entrypoint=/foo.sh                   | --entrypoint=/foo.sh                                 |
 | Exec=/usr/bin/command                | Command after image specification - /usr/bin/command |
 | ExposeHostPort=50-59                 | --expose 50-59                                       |
 | GIDMap=0:10000:10                    | --gidmap=0:10000:10                                  |
@@ -320,6 +321,12 @@ This key may be used multiple times, and the order persists when passed to `podm
 
 Use the host environment inside of the container.
 
+#### `Entrypoint=`
+
+Override the default ENTRYPOINT from the image.
+Equivalent to the Podman `--entrypoint` option.
+Specify multi option commands in the form of a json string.
+
 ### `Exec=`
 
 If this is set then it defines what command line to run in the container. If it is not set the

pkg/systemd/quadlet/quadlet.go

@@ -72,6 +72,7 @@ const (
 	KeyEnvironment           = "Environment"
 	KeyEnvironmentFile       = "EnvironmentFile"
 	KeyEnvironmentHost       = "EnvironmentHost"
+	KeyEntrypoint            = "Entrypoint"
 	KeyExec                  = "Exec"
 	KeyExitCodePropagation   = "ExitCodePropagation"
 	KeyExposeHostPort        = "ExposeHostPort"
@@ -180,6 +181,7 @@ var (
 		KeyEnvironment:           true,
 		KeyEnvironmentFile:       true,
 		KeyEnvironmentHost:       true,
+		KeyEntrypoint:            true,
 		KeyExec:                  true,
 		KeyExposeHostPort:        true,
 		KeyGIDMap:                true,
@@ -628,6 +630,11 @@ func ConvertContainer(container *parser.UnitFile, names map[string]string, isUse
 		podman.addf("--shm-size=%s", shmSize)
 	}
 
+	entrypoint, hasEntrypoint := container.Lookup(ContainerGroup, KeyEntrypoint)
+	if hasEntrypoint {
+		podman.addf("--entrypoint=%s", entrypoint)
+	}
+
 	sysctl := container.LookupAllStrv(ContainerGroup, KeySysctl)
 	for _, sysctlItem := range sysctl {
 		podman.addf("--sysctl=%s", sysctlItem)

test/system/252-quadlet.bats

@@ -1467,4 +1467,22 @@ EOF
 
     run_podman rmi $(pause_image)
 }
+@test "quadlet - entrypoint" {
+ local quadlet_file=$PODMAN_TMPDIR/basic_$(random_string).container
+    cat > $quadlet_file <<EOF
+[Container]
+Image=$IMAGE
+Entrypoint=top
+EOF
+
+    run_quadlet "$quadlet_file"
+    service_setup $QUADLET_SERVICE_NAME
+
+    # Create a container based on that
+    run_podman container inspect  --format '{{index .Args}}' $QUADLET_CONTAINER_NAME
+    is "$output" "[top]"
+
+    service_cleanup $QUADLET_SERVICE_NAME failed
+}
+
 # vim: filetype=sh