[DistroKit] [RFC] x86_64: run: add 9p tcp based rootfs support

[Michael Grzeschik <m.grzeschik@pengutronix.de>]

Since there is no diod server ptxdist host tool available yet, this
script starts the version from debian.

It is also to be found how to best start the server.
For now this simple script works as proof of concept including
ugly hacks to run and stop diod around the qemu exec.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
---
 configs/platform-x86_64/run | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/configs/platform-x86_64/run b/configs/platform-x86_64/run
index 96322292..cd726021 100755
--- a/configs/platform-x86_64/run
+++ b/configs/platform-x86_64/run
@@ -118,6 +118,31 @@ run_qemu_9p() {
 		-append "root=/dev/root rw rootfstype=9p rootflags=trans=virtio ${BASE_CMDLINE}"
 }
 
+# 9p net port
+P9_ROOTFS_PORT=99999
+
+run_qemu_9pnet() {
+	ROOTPATH=$(realpath ${PTXDIST_PLATFORMDIR}/root)
+	# the emulator to run
+	DIOD_EXEC="/sbin/diod"
+
+	if [ ! -e "${DIOD_EXEC}" ]; then
+		echo "error: apt-get install 'diod' first"
+		exit 1
+	fi
+
+	${DIOD_EXEC} -f -n -S -l 127.0.0.1:${P9_ROOTFS_PORT} -e ${ROOTPATH} &
+	# this is an ugly workaround so diod will be closed after qemu has stopped
+	DIOD_PID=$(echo $!)
+	(tail --pid $$ -f /dev/null; kill ${DIOD_PID}) &
+
+	exec ${QEMU_EXEC} \
+		"${QEMU_ARGS[@]}" \
+		"${QEMU_EXTRA_ARGS[@]}" \
+		"${QEMU_LINUX_ARGS[@]}" \
+		-append "ip=dhcp root=10.0.2.2 rw rootfstype=9p rootflags=trans=tcp,version=9p2000.L,aname=${ROOTPATH},port=${P9_ROOTFS_PORT} ${BASE_CMDLINE} ${EXTRA_CMDLINE}"
+}
+
 target="${1:-9p}"
 
 #set -x
-- 
2.39.2