From 9453a03815bea3a2655ba3f22637a226b30dd09c Mon Sep 17 00:00:00 2001
From: Nulo <git@nulo.in>
Date: Sat, 18 Jun 2022 12:05:18 -0300
Subject: [PATCH] Modulo de data

---
 .gitignore        |  1 +
 alpine.lua        | 10 ++++++++++
 modules/data.lua  | 51 +++++++++++++++++++++++++++++++++++++++++++++++
 modules/runit.lua |  7 +++++--
 qemu.sh           |  6 +++++-
 setup.lua         |  4 ++++
 6 files changed, 76 insertions(+), 3 deletions(-)
 create mode 100644 modules/data.lua

diff --git a/.gitignore b/.gitignore
index b9b4cd4..3bdcd8f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ v00001/
 boot/
 image.squashfs
 cache/
+tmp.qcow2
diff --git a/alpine.lua b/alpine.lua
index 7114ab0..64c885a 100644
--- a/alpine.lua
+++ b/alpine.lua
@@ -46,6 +46,16 @@ function alpine.mkdir(rootfs_path, path)
 	if not (status == 0) then return status end
 end
 
+function alpine.touch(rootfs_path, path)
+	local real_path = rootfs_path..path
+
+	local cmd = t("touch '{{real_path}}'", { real_path = real_path })
+
+	-- XXX: Usar lua-posix
+	local status = os.execute(cmd)
+	if not (status == 0) then return status end
+end
+
 function alpine.write_file(rootfs_path, path, content)
 	local real_path = rootfs_path..path
 
diff --git a/modules/data.lua b/modules/data.lua
new file mode 100644
index 0000000..11ebefb
--- /dev/null
+++ b/modules/data.lua
@@ -0,0 +1,51 @@
+local t = require "../utils/templater"
+local dirs = {}
+
+local function generate_mount_data()
+	local string = "#!/bin/sh\n"
+	for i=1,#dirs do
+		local dir = dirs[i]
+		if dir.type == "file" then
+			touch(dir.mountpoint)
+			string = string .. t([[
+touch -a '{{path}}' || exit 1
+mount '{{path}}' '{{mountpoint}}' -o bind,umask=100,uid={{uid}},gid={{gid}} || exit 1
+]],
+				dir
+			)
+		elseif dir.type == "dir" then
+			mkdir(dir.mountpoint)
+			string = string .. t([[
+mkdir -p '{{path}}' || exit 1
+mount '{{path}}' '{{mountpoint}}' -o bind,umask=100,uid={{uid}},gid={{gid}} || exit 1
+]],
+				dir
+			)
+		end
+	end
+	add_file("/usr/local/bin/mount-data", string)
+	chmod("/usr/local/bin/mount-data", 700)
+end
+local function add_data_dir(path, mountpoint, uid, gid)
+	table.insert(dirs, {
+		type = "dir",
+		path = path, mountpoint = mountpoint, uid = uid, gid = gid
+	})
+	generate_mount_data()
+end
+local function add_data_file(path, mountpoint, uid, gid)
+	table.insert(dirs, {
+		type = "file",
+		path = path, mountpoint = mountpoint, uid = uid, gid = gid
+	})
+	generate_mount_data()
+end
+
+modules.data = {
+	add_data_dir = add_data_dir,
+	add_data_file = add_data_file,
+}
+
+mkdir("/data")
+-- XXX: hardcodeado
+modules.fstab.add_mount("/dev/sdb /data ext4 defaults 0 0")
diff --git a/modules/runit.lua b/modules/runit.lua
index ca149db..886cc6b 100644
--- a/modules/runit.lua
+++ b/modules/runit.lua
@@ -23,8 +23,6 @@ modules.runit = {
     add_service = add_service,
 }
 
-modules.fstab.add_mount("tmpfs /var/log tmpfs defaults 0 0")
-
 -- Estos scripts fueron robados de Void Linux
 add_executable("/etc/runit/functions", [[
 msg() {
@@ -235,6 +233,9 @@ fi
 
 msg "Mounting all non-network filesystems..."
 mount -a -t "nosysfs,nonfs,nonfs4,nosmbfs,nocifs" -O no_netdev || emergency_shell
+# data module
+msg "Creating and mounting data directories..."
+/usr/local/bin/mount-data || emergency_shell
 ]])
 
 add_executable("/etc/runit/core-services/04-swap.sh", [[
@@ -255,6 +256,8 @@ msg "Setting hostname..."
 hostname -F /etc/hostname
 ]])
 
+modules.data.add_data_file("/data/dmesg.log", "/var/log/dmesg.log", "root", "root")
+
 -- Initial boot
 add_executable("/etc/runit/1", [[#!/bin/sh
 
diff --git a/qemu.sh b/qemu.sh
index c3dbe06..00b9c4d 100755
--- a/qemu.sh
+++ b/qemu.sh
@@ -5,8 +5,12 @@ if test "$NOGRAPHIC" = true; then
 	qemuappend="-nographic"
 fi
 
+qemu-img create -f qcow2 tmp.qcow2 1G
+mkfs.ext4 tmp.qcow2
+
 sudo chown root:$(id -u) -R boot/ && sudo chmod g+rw -R boot/
 qemu-system-x86_64 -enable-kvm -m 2048 \
 	-drive file=image.squashfs,media=disk \
+	-drive file=tmp.qcow2,media=disk \
 	-kernel boot/vmlinuz-virt -initrd boot/initramfs-virt \
-	-append "root=/dev/sda rootfstype=squashfs init=/sbin/runit-init $append" $qemuappend
+	-append "root=/dev/sda rootfstype=squashfs modules=ext4 init=/sbin/runit-init $append" $qemuappend
diff --git a/setup.lua b/setup.lua
index 6c1185d..836d2a7 100644
--- a/setup.lua
+++ b/setup.lua
@@ -29,6 +29,9 @@ end
 function mkdir(path)
 	utils.expect_nil(alpine.mkdir(root, path))
 end
+function touch(path)
+	utils.expect_nil(alpine.touch(root, path))
+end
 
 print("=> Initializing rootfs...")
 utils.expect_nil(alpine.init_rootfs(root, alpine_base_version, alpine_version))
@@ -38,6 +41,7 @@ local function module(name)
 	require("modules/" .. name)
 end
 module "fstab"
+module "data"
 module "kernel"
 module "runit"
 module "hostname"