host/rootfs: generate virtiofsd services

The approach of having a template service for each virtiofsd comes
from the work I need on Wayland support for Unikie, hence the Unikie
copyright in etc/s6-rc/ext-rc-init/up.

Signed-off-by: Alyssa Ross <hi@alyssa.is>
Message-Id: <20221010232909.1953738-4-hi@alyssa.is>

8 files changed, 33 insertions, 2 deletions

diff --git a/host/rootfs/Makefile b/host/rootfs/Makefile
index f4b17a0..39911eb 100644
--- a/host/rootfs/Makefile
+++ b/host/rootfs/Makefile
@@ -16,6 +16,9 @@ FILES = \
 	etc/mdev/wait \
 	etc/parse-devname \
 	etc/passwd \
+	etc/template/fs/notification-fd \
+	etc/template/fs/run \
+	etc/template/fs/type \
 	etc/s6-linux-init/run-image/service/getty-tty1/run \
 	etc/s6-linux-init/run-image/service/getty-tty2/run \
 	etc/s6-linux-init/run-image/service/getty-tty3/run \
diff --git a/host/rootfs/default.nix b/host/rootfs/default.nix
index 95bb3a8..9f1d426 100644
--- a/host/rootfs/default.nix
+++ b/host/rootfs/default.nix
@@ -8,7 +8,7 @@ pkgs.pkgsStatic.callPackage (
 
 { lib, stdenvNoCC, nixos, runCommand, writeReferencesToFile, s6-rc, tar2ext4
 , busybox, cloud-hypervisor, cryptsetup, execline, e2fsprogs, jq, kmod
-, mdevd, s6, s6-linux-init, socat, util-linuxMinimal, xorg
+, mdevd, s6, s6-linux-init, socat, util-linuxMinimal, virtiofsd, xorg
 }:
 
 let
@@ -50,7 +50,7 @@ let
 
   packages = [
     cloud-hypervisor e2fsprogs execline jq kmod mdevd s6 s6-linux-init s6-rc
-    socat start-vm
+    socat start-vm virtiofsd
 
     (cryptsetup.override {
       programs = {
diff --git a/host/rootfs/etc/s6-rc/ext-rc-init/up b/host/rootfs/etc/s6-rc/ext-rc-init/up
index 1aec7fb..53ab127 100644
--- a/host/rootfs/etc/s6-rc/ext-rc-init/up
+++ b/host/rootfs/etc/s6-rc/ext-rc-init/up
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: EUPL-1.2+
 # SPDX-FileCopyrightText: 2021-2022 Alyssa Ross <hi@alyssa.is>
+# SPDX-FileCopyrightText: 2022 Unikie
 
 if { mkdir -p /run/s6-rc.ext.src }
 
@@ -15,6 +16,16 @@ if {
   if { redirfd -w 1 ${name}/notification-fd echo 3 }
   if { ln -s -- /bin/start-vm ${name}/run }
 
+  if {
+    elglob -0 paths ${dir}/shared-dirs/*
+    forx -pE path { $paths }
+    backtick -E fsname { basename -- $path }
+    if { cp -R -- /etc/template/fs ${name}-fs-${fsname} }
+    if { mkdir -- ${name}-fs-${fsname}/data ${name}-fs-${fsname}/env }
+    if { cp -P -- ${path}/dir ${name}-fs-${fsname}/data/shared-dir }
+    touch -- ${name}/dependencies.d/${name}-fs-${fsname}
+  }
+
   elglob -0 paths /ext/svc/data/${name}/providers/net/*
   forx -pE path { $paths }
   backtick -E dep { basename -- $path }
diff --git a/host/rootfs/etc/template/fs/notification-fd b/host/rootfs/etc/template/fs/notification-fd
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ b/host/rootfs/etc/template/fs/notification-fd
@@ -0,0 +1 @@
+3
diff --git a/host/rootfs/etc/template/fs/notification-fd.license b/host/rootfs/etc/template/fs/notification-fd.license
new file mode 100644
index 0000000..5a40633
--- /dev/null
+++ b/host/rootfs/etc/template/fs/notification-fd.license
@@ -0,0 +1,2 @@
+SPDX-License-Identifier: CC0-1.0
+SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>
diff --git a/host/rootfs/etc/template/fs/run b/host/rootfs/etc/template/fs/run
new file mode 100755
index 0000000..5ca214a
--- /dev/null
+++ b/host/rootfs/etc/template/fs/run
@@ -0,0 +1,11 @@
+#!/bin/execlineb -P
+# SPDX-License-Identifier: EUPL-1.2+
+# SPDX-FileCopyrightText: 2021-2022 Alyssa Ross <hi@alyssa.is>
+
+s6-ipcserver-socketbinder -a 0700 -B env/virtiofsd.sock
+
+if { fdmove 1 3 echo }
+fdclose 3
+
+export TMPDIR /run
+virtiofsd --fd 0 --shared-dir data/shared-dir
diff --git a/host/rootfs/etc/template/fs/type b/host/rootfs/etc/template/fs/type
new file mode 100644
index 0000000..5883cff
--- /dev/null
+++ b/host/rootfs/etc/template/fs/type
@@ -0,0 +1 @@
+longrun
diff --git a/host/rootfs/etc/template/fs/type.license b/host/rootfs/etc/template/fs/type.license
new file mode 100644
index 0000000..5a40633
--- /dev/null
+++ b/host/rootfs/etc/template/fs/type.license
@@ -0,0 +1,2 @@
+SPDX-License-Identifier: CC0-1.0
+SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>