Add "nfs" initrd profile

nfs-utils-2.8.4 will provide its own nfsroot-generator [1] to allow mounting the
real rootfs via NFSv4, so this initrd profile will enable this feature.

[1] http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=commit;h=ed86ea08dadafbac948c6a45629a6f3282a77233

Author: aafeijoo-suse

mkosi/config.py

@@ -637,6 +637,7 @@ def default(cls) -> tuple["ToolsTreeProfile", ...]:
 class InitrdProfile(StrEnum):
     lvm = enum.auto()
     network = enum.auto()
+    nfs = enum.auto()
     pkcs11 = enum.auto()
     plymouth = enum.auto()
     raid = enum.auto()

mkosi/initrd.py

@@ -210,6 +210,10 @@ def network_config() -> list[str]:
     ]
 
 
+def nfs_config() -> list[str]:
+    return [f"--extra-tree={f}:{f}" for f in ("/etc/idmapd.conf", "/etc/idmapd.conf.d") if Path(f).exists()]
+
+
 def raid_config() -> list[str]:
     return [
         f"--extra-tree={f}:{f}"
@@ -349,6 +353,8 @@ def main() -> None:
             cmdline += ["--profile", p]
             if p == "network":
                 cmdline += network_config()
+            elif p == "nfs":
+                cmdline += nfs_config()
             elif p == "raid":
                 cmdline += raid_config()
 

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

@@ -46,6 +46,8 @@ initrds and Unified Kernel Images for the current running system.
 
     The `lvm` profile enables support for LVM.
     The `network` profile enables support for network via **systemd-networkd**.
+    The `nfs` profile enables support for NFS. It requires networking in the
+    initrd, using the `network` profile, or some other custom method.
     The `pkcs11` profile enables support for PKCS#11.
     The `plymouth` profile provides a graphical interface at boot (animation and
     password prompt).

mkosi/resources/man/mkosi.1.md

@@ -1054,6 +1054,8 @@ boolean argument: either `1`, `yes`, or `true` to enable, or `0`, `no`,
 
     The `lvm` profile enables support for LVM.
     The `network` profile enables support for network via **systemd-networkd**.
+    The `nfs` profile enables support for NFS. It requires networking in the
+    initrd, using the `network` profile, or some other custom method.
     The `pkcs11` profile enables support for PKCS#11.
     The `plymouth` profile provides a graphical interface at boot (animation and
     password prompt).

mkosi/resources/mkosi-initrd/mkosi.profiles/nfs/mkosi.conf

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[Content]
+KernelModules=
+        fs/nfs/
+        net/sunrpc/
+        nfs_acl

mkosi/resources/mkosi-initrd/mkosi.profiles/nfs/mkosi.conf.d/arch.conf

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[Match]
+Distribution=arch
+
+[Content]
+Packages=nfs-utils

mkosi/resources/mkosi-initrd/mkosi.profiles/nfs/mkosi.conf.d/debian-ubuntu.conf

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[Match]
+Distribution=|debian
+Distribution=|ubuntu
+
+[Content]
+Packages=nfs-common

mkosi/resources/mkosi-initrd/mkosi.profiles/nfs/mkosi.conf.d/fedora.conf

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[Match]
+Distribution=fedora
+
+[Content]
+Packages=
+        nfs-utils
+        libnfsidmap

mkosi/resources/mkosi-initrd/mkosi.profiles/nfs/mkosi.conf.d/opensuse.conf

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[Match]
+Distribution=opensuse
+
+[Content]
+Packages=
+        nfs-client
+        libnfsidmap1