mkosi-initrd: add option to build generic initrds

mkosi/initrd.py

@@ -220,6 +220,13 @@ def main() -> None:
         help="Output format (CPIO archive, UKI or local directory)",
         default="cpio",
     )
+    parser.add_argument(
+        "-g",
+        "--generic",
+        help="Build a generic initrd without host-specific kernel modules",
+        action="store_true",
+        default=False,
+    )
 
     initrd_common_args(parser)
 
@@ -245,11 +252,13 @@ def main() -> None:
             "--extra-tree=/usr/lib/firmware:/usr/lib/firmware",
             "--remove-files=/usr/lib/firmware/*-ucode",
             "--kernel-modules-exclude=.*",
-            "--kernel-modules-include=host",
             "--build-sources", "",
             "--include=mkosi-initrd",
         ]  # fmt: skip
 
+        if not args.generic:
+            cmdline += ["--kernel-modules-include=host"]
+
         if args.kernel_image:
             cmdline += [
                 "--extra-tree", f"{args.kernel_image}:/usr/lib/modules/{args.kernel_version}/vmlinuz",

mkosi/resources/man/mkosi-initrd.1.md

@@ -35,6 +35,11 @@ initrds and Unified Kernel Images for the current running system.
 :   Path to a directory where to place all generated artifacts. Defaults to the
     current working directory.
 
+`--generic=`, `-g`
+:   Build a generic initrd without host-specific kernel modules, which should
+    allow the local system to boot on different hardware, although it's tied to
+    the kernel version of the running system or set with `--kernel-version=`.
+
 `--debug=`
 :   Enable additional debugging output.