feat: add binfmt_misc

Add binfmt-misc kernel support.

Signed-off-by: Serge Logvinov <serge.logvinov@sinextra.dev>

Makefile

@@ -42,6 +42,7 @@ space = $(empty) $(empty)
 TARGETS = \
 		amdgpu-firmware \
 		amd-ucode \
+		binfmt-misc \
 		bnx2-bnx2x \
 		btrfs \
 		chelsio-drivers \

README.md

@@ -42,6 +42,12 @@ All system extensions provided by Sidero Labs can be found in the [ghcr.io regis
 | [thunderbolt](drivers/thunderbolt/)  | [ghcr.io/siderolabs/thunderbolt](https://github.com/siderolabs/extensions/pkgs/container/thunderbolt)                                       | Thunderbolt drivers                  | `talos version`                                       |
 | [usb-modem](drivers/usb-modem/)      | [ghcr.io/siderolabs/usb-modem-drivers](https://github.com/siderolabs/extensions/pkgs/container/usb-modem-drivers)                           | USB Modem drivers                    | `talos version`                                       |
 
+### Miscellaneous
+
+| Name                            | Image                                                                                             | Description                        | Version Format     |
+| ------------------------------- | ------------------------------------------------------------------------------------------------- | ---------------------------------- | ------------------ |
+| [binfmt-misc](modules/binfmt-misc) | [ghcr.io/siderolabs/binfmt-misc](https://github.com/siderolabs/extensions/pkgs/container/binfmt-misc) | Miscellaneous Binary Format | `talos version`                                       |
+
 ### Network
 
 | Name                            | Image                                                                                             | Description                        | Version Format     |

hack/release.toml

@@ -37,6 +37,12 @@ AMD GPU firmware is now shipped as a system extension.
         title = "BTRFS"
         description = """\
 BTRFS drivers is now supported as Talos System Extension.
+"""
+
+    [notes.binfmt_misc]
+        title = "binfmt_misc"
+        description = """\
+`binfmt_misc` Linux module extension is now supported as Talos System Extension.
 """
 
     [notes.zfs]

misc/binfmt-misc/README.md

@@ -0,0 +1,17 @@
+# binfmt_misc
+
+Miscellaneous Binary Format is a capability of the Linux kernel that allows arbitrary executable file formats to be recognized and passed to certain user space applications, such as emulators and virtual machines.
+
+## Installation
+
+Add the extension to your machine config and enable the modules.
+
+```yaml
+machine:
+  install:
+    extensions:
+      - image: ghcr.io/siderolabs/binfmt-misc:<VERSION>
+  kernel:
+    modules:
+      - name: binfmt_misc
+```

misc/binfmt-misc/files/modules.txt

@@ -0,0 +1,4 @@
+modules.order
+modules.builtin
+modules.builtin.modinfo
+kernel/fs/binfmt_misc.ko

misc/binfmt-misc/manifest.yaml

@@ -0,0 +1,10 @@
+version: v1alpha1
+metadata:
+  name: binfmt-misc
+  version: "$VERSION"
+  author: Serge Logvinov
+  description: |
+    This system extension provides kernel module driver for binfmt-misc built against a specific Talos version.
+  compatibility:
+    talos:
+      version: ">= v1.5.0"

misc/binfmt-misc/pkg.yaml

@@ -0,0 +1,29 @@
+name: binfmt-misc
+variant: scratch
+shell: /toolchain/bin/bash
+dependencies:
+  - stage: base
+  # The pkgs version for a particular release of Talos as defined in
+  # https://github.com/siderolabs/talos/blob/<talos version>/pkg/machinery/gendata/data/pkgs
+  - image: "{{ .PKGS_PREFIX }}/kernel:{{ .BUILD_ARG_PKGS }}"
+steps:
+  - prepare:
+      - |
+        sed -i 's#$VERSION#{{ .VERSION }}#' /pkg/manifest.yaml
+  - install:
+      - |
+        export KERNELRELEASE=$(find /lib/modules -type d -name "*-talos" -exec basename {} \+)
+
+        mkdir -p /rootfs
+
+        xargs -a /pkg/files/modules.txt -I {} install -D /lib/modules/${KERNELRELEASE}/{} /rootfs/lib/modules/${KERNELRELEASE}/{}
+        depmod -b /rootfs ${KERNELRELEASE}
+  - test:
+      - |
+        # https://www.kernel.org/doc/html/v4.15/admin-guide/module-signing.html#signed-modules-and-stripping
+        find /rootfs/lib/modules -name '*.ko' -exec grep -FL '~Module signature appended~' {} \+
+finalize:
+  - from: /rootfs
+    to: /rootfs
+  - from: /pkg/manifest.yaml
+    to: /

misc/binfmt-misc/vars.yaml

@@ -0,0 +1 @@
+VERSION: "{{ .BUILD_ARG_TAG }}"