From b2293be2da4111d9c30303e7dc5ce37bc994c585 Mon Sep 17 00:00:00 2001
From: tar <vunmnn@gmail.com>
Date: Sun, 1 Dec 2024 18:26:44 +0100
Subject: [PATCH] Add vio9p script for NetBSD

---
 vio9p-share-netbsd10.sh | 162 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 vio9p-share-netbsd10.sh

diff --git a/vio9p-share-netbsd10.sh b/vio9p-share-netbsd10.sh
new file mode 100644
index 0000000..a35c227
--- /dev/null
+++ b/vio9p-share-netbsd10.sh
@@ -0,0 +1,162 @@
+#!/bin/sh
+
+#############################################################
+# Author: Taryel Hlontsi, 2024
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>
+#############################################################
+
+doc=$(cat <<'EOF'
+NOTES:
+To be able to mount a directory in NetBSD that runs as KVM/Qemu quest
+the following has to be done:
+1) the kernel must include vio9p driver (not included by default)
+2) dev node has to be created for the character device (file share in this case)
+3) mount_9p utility must be used to mount the file share
+4) (oprional) a service can be created that mounts the fileshare at boot time
+EOF
+)
+
+
+#############################################################
+#          HELPER FUNCTIONS
+#############################################################
+
+info() {
+    GREEN='\033[1;32m'
+    NC='\033[0m'
+    echo -e "${GREEN}$1${NC}"
+}
+
+trace() {
+    YELLOW='\033[1;33m'
+    NC='\033[0m'
+    echo -e "${YELLOW}$1${NC}"
+}
+
+warn() {
+    PURPLE='\033[1;35m'
+    NC='\033[0m'
+    echo -e "${PURPLE}$1${NC}"
+}
+
+error() {
+    RED='\033[1;31m'
+    NC='\033[0m'
+    echo -e "${RED}$1${NC}"
+}
+
+
+#############################################################
+#          1 - BUILD AND INSTALL KERNEL THAT SUPPORTS VIO9P DRIVER
+#############################################################
+install_kernel_with_vio9p() {
+    local step_name='STEP 1: BUILD AND INSTALL KERNEL THAT SUPPORTS VIO9P'
+    warn "Press enter to proceed with $step_name"; read confirm
+    info "$step_name"
+
+    local expected_kernel_name='MYKERNEL2'
+
+    if uname -v | grep -q "$expected_kernel_name"; then
+	warn 'The kernel seems to be already installed. Nothing to do'
+	return 0
+    fi
+
+    local config_path="/usr/src/sys/arch/$(uname -m)/conf/"
+    if [ ! -e "$config_path" ]; then
+	warn 'There is no sources to compile the kernel.'
+	warn 'Go to https://www.netbsd.org/docs/guide/en/chap-fetch.html'
+	warn 'to check how to obtain the sources'
+	return 1
+    fi
+    cd $config_path
+    pwd
+
+    cp GENERIC $expected_kernel_name
+    sed -i "s~^#vio9p~vio9p~" $expected_kernel_name
+    config $expected_kernel_name && \
+	cd ../compile/$expected_kernel_name && \
+	make depend && \
+	make && \
+	mv /netbsd /netbsd.backup && \
+	mv netbsd /
+	
+    if [ $? != 0 ]; then
+	warn 'Something went bananas while compiling and installing the kernel'
+	return 1
+    fi
+
+    info 'Now the machine will be rebooted'
+    info 'After that, run the script again to continue this process'
+    shutdown -r +1
+}
+
+#############################################################
+#          2 - MOUNT SHARED DIR
+#############################################################
+mount_virtio9p_share() {
+    local step_name='STEP 2: MOUNT VIRTIO 9P SHARED DIR'
+    warn "Press enter to proceed with $step_name"; read confirm
+    info "$step_name"
+
+    local service_name='share'
+    local config_file="/etc/rc.d/${service_name}"
+    
+    cd /dev && sh MAKEDEV vio9p0
+
+    if [ $? != 0 ]; then
+	warn 'MAKEDEV failed'
+	return 1
+    fi
+
+    cat <<'EOF' > ${config_file}
+#!/bin/sh
+#
+# PROVIDE: share
+# REQUIRE: DAEMON
+# KEYWORD: shutdown
+
+. /etc/rc.subr
+
+name="share"
+rcvar="$name"
+command="mount_9p -cu /dev/vio9p0 /mnt"
+start_cmd="share_start"
+stop_cmd=":"
+
+share_start() {
+	echo "Mounting vio9p0 file share to /mnt"
+	${command}
+}
+
+load_rc_config $name
+run_rc_command "$1"
+EOF
+
+    local system_config='/etc/rc.conf'
+    local service_enable="$service_name=YES"
+
+    cat $system_config | grep -q "$service_enable" \
+	|| echo "$service_enable" >> $system_config
+
+    info 'STEP 2 is done!'
+    info 'Now the machine will be rebooted'
+    info 'Once rebooted, run `ls /mnt` to check if the fileshare is mounted'
+    shutdown -r +1
+}
+
+info "$doc"
+
+install_kernel_with_vio9p \
+    && mount_virtio9p_share
+