[PATCH v2 06/13] recipes-containers/images: add app-container-mosquitto

Add OCI container image recipe for the Eclipse Mosquitto MQTT broker.
The image uses multi-layer mode with separate base and mosquitto layers,
exposes standard MQTT (1883) and WebSocket (9001) ports, and launches
mosquitto with its default config file as the entrypoint.

Inherit container-nonroot-user to run as 'nonroot' with UID 65532.

Inherit container-volatile-fixup to fix 'log' and 'tmp' in
/var/volatile.

Inherit container-dev-mode to optionally run as UID '0' root user
and provide a shell.

Relies on image-oci to auto-derive IMAGE_INSTALL from OCI_LAYERS
packages: layers.

Signed-off-by: Tim Orling <[email protected]>
---
 .../images/app-container-mosquitto.bb         | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 recipes-containers/images/app-container-mosquitto.bb

diff --git a/recipes-containers/images/app-container-mosquitto.bb b/recipes-containers/images/app-container-mosquitto.bb
new file mode 100644
index 00000000..9a74dcd8
--- /dev/null
+++ b/recipes-containers/images/app-container-mosquitto.bb
@@ -0,0 +1,43 @@
+SUMMARY = "Mosquitto MQTT broker container image"
+DESCRIPTION = "OCI container running the Eclipse Mosquitto MQTT broker \
+with standard MQTT (1883) and WebSocket (9001) listeners enabled."
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+# Multi-layer mode: create explicit layers instead of single rootfs layer
+OCI_LAYER_MODE = "multi"
+
+# Optional 'dev' mode:
+#   - adds a shell to the container
+#   - adds python3-pip to the python layer (enables `pip install` at runtime)
+#   - runs the container as root (UID 0) so pip can write to site-packages
+# Enable with: PACKAGECONFIG:pn-app-container-python = "dev"
+PACKAGECONFIG ??= ""
+PACKAGECONFIG[dev] = ""
+inherit container-dev-mode
+
+# Define layers: each layer contains specific packages
+# Format: "name:type:content" where content uses + as delimiter for multiple items
+OCI_LAYERS = "\
+    base:packages:base-files+base-passwd+netbase \
+    ${@bb.utils.contains('PACKAGECONFIG', 'dev', 'shell:packages:${CONTAINER_SHELL}', '', d)} \
+    mosquitto:packages:mosquitto \
+"
+
+IMAGE_FSTYPES = "container oci"
+inherit image
+inherit image-oci
+inherit container-nonroot-user
+inherit container-volatile-fixup
+
+IMAGE_FEATURES = ""
+IMAGE_LINGUAS = ""
+NO_RECOMMENDATIONS = "1"
+
+# Allow build with or without a specific kernel
+IMAGE_CONTAINER_NO_DUMMY = "1"
+
+OCI_IMAGE_ENTRYPOINT = "${sbindir}/mosquitto"
+OCI_IMAGE_ENTRYPOINT_ARGS = "-c '${sysconfdir}/mosquitto/mosquitto.conf'"
+OCI_IMAGE_PORTS = "1883/tcp 9001/tcp"
+OCI_IMAGE_TAG = "latest"
-- 
2.54.0