postmarketos-initramfs: switch to udev

mdev is slow and missing features, it also requires that we load all the
modules that we include at once making the boot process slower.

udev is required for unl0kr (and buffyboard), it can also load modules
on demand (and asynchronously). Making the boot process considerably
faster on devices, especially for generic images where we have lots of
drivers for different display panels in the initramfs.

This brings us more in line with other distros and generally improves
compatibility.

If devices use broken kernel modules which don't correctly define
modalias', these drivers may not be loaded by udev. This should be fixed
by defining the missing modalias statements in the driver.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

main/postmarketos-initramfs/00-initramfs-base.files

@@ -3,7 +3,6 @@
 /bin/sh
 /etc/deviceinfo
 /etc/unudhcpd.conf
-/lib/mdev/persistent-storage
 /sbin/blkid
 /usr/bin/iskey
 /usr/bin/unudhcpd
@@ -11,7 +10,13 @@
 /usr/share/deviceinfo/deviceinfo
 /usr/share/initramfs/init.sh:/init
 /usr/share/initramfs/init_functions.sh:/init_functions.sh
-/usr/share/initramfs/mdev.conf:/etc/mdev.conf
 /usr/share/misc/source_deviceinfo
 /usr/bin/buffyboard
 /usr/share/consolefonts/ter-128n.psf.gz
+/usr/bin/iskey
+/usr/share/libinput/*.quirks
+/bin/udevadm
+/sbin/udevd
+/etc/udev/rules.d
+/lib/udev/rules.d
+/lib/udev/scsi_id

main/postmarketos-initramfs/APKBUILD

 # Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
 # Co-Maintainer: Clayton Craft <clayton@craftyguy.net>
 pkgname=postmarketos-initramfs
-pkgver=2.6.0
+pkgver=2.7.0
 pkgrel=0
 pkgdesc="Base files for the postmarketOS initramfs / initramfs-extra"
 url="https://postmarketos.org"
@@ -23,11 +23,11 @@ depends="
 	font-terminus
 	iskey
 	lz4
-	mdev-conf
 	multipath-tools
 	parted
 	postmarketos-fde-unlocker
 	postmarketos-mkinitfs>=2.2
+	udev
 	unudhcpd
 	util-linux-misc
 	xz
@@ -40,7 +40,6 @@ source="
 	init.sh
 	init_functions.sh
 	unudhcpd.conf
-	mdev.conf
 	"
 arch="noarch"
 license="GPL-2.0-or-later"
@@ -79,9 +78,6 @@ package() {
 		-t "$pkgdir"/usr/share/mkinitfs/files-extra/
 	mkdir -p "$pkgdir"/etc/mkinitfs/files-extra
 
-	install -Dm644 "$srcdir"/mdev.conf \
-		-t "$pkgdir"/usr/share/initramfs/
-
 	mkdir -p "$pkgdir"/usr/share/mkinitfs/hooks
 	mkdir -p "$pkgdir"/usr/share/mkinitfs/hooks-extra
 	mkdir -p "$pkgdir"/etc/mkinitfs/hooks
@@ -91,10 +87,9 @@ package() {
 sha512sums="
 59be0649ed87a72d93624bd8a2e3f8c99a0f32f7b7a26f99436de782beba55671472c269eeee86440efc87e0d7148a0bb335fa537791092e73878ca21330544a  00-default.modules
 5b364300f31c91fd0591eb0715f67cbf5383f45246a5fb9f34b79f7cb2e3b15768b2130e5f32f816cc169950f988c1beabc879ba31645c58ce131a288dbc071d  00-initramfs-base.dirs
-0fed7dfdf940f5de15ca2fa636214d44ee8549afe5001b81beb0e337e865eb737916e158bc0ed7a7803adc81176386ae8edfc21150de62bb136fdfcdcb888b8b  00-initramfs-base.files
+7b103923db8752e64911afe25788621622760eae95ad2e76c1cdb078e4647a6ebc00b174f17e3fe0a3747bcbd034cdb500d31ae5212357eb5e91516d696c66d5  00-initramfs-base.files
 8a4adad3785af474b36a09a05f6a3b2c4b4f43aac331a53b903abfa51ea12be1e3d1d807b7a6e66a1346815f3b0044daf8cd62e21e2dc75d2db13ee265a72985  00-initramfs-extra-base.files
-c433684398bdab7b85383ba13f80ce306d24481bdc553aec64f5aaa2547fa97e7dc0934a962ed55a57a45dbde1878f8058579149bd6e0d953e6a2a3174f79613  init.sh
-cf5b0beaffff0aa17196af39ac7e84d890ee5c9487920e12af7079728c713dc3bb170f3045797f09be436885d02d2ba5dea98c0a3ab08e3aad3bbf66aecb711d  init_functions.sh
+5f50c6df8b959efe8a3886f26939d69c12a28d16643bb1bb828959e1f69923967931857921b3e5e1541f45ae9b5f2bc3c93015a0d414d02d03aaf3e1a9f36141  init.sh
+0624034b4ef87b71b06cdfbdf62131e1f02b013b4676a49536c09cacef56308895e077a1f4f742e05945864e5ae2f476b10e5d088be2e8e8701c68897fed227d  init_functions.sh
 ba3275a9af788c7c782322a22a0f144d5e50e3498ea6886486a29331f23ae89cd32d500a3635cfa7cab369afba92edc18aeca64ccbf0cd589061cce23d15b46c  unudhcpd.conf
-675e7d5bee39b2df7d322117f8dcaccc274d61beaf4d50ead19bbf2109446d64b1c0aa0c5b4f9846eb6c1c403418f28f6364eff4537ba41120fbfcbc484b7da7  mdev.conf
 "

main/postmarketos-initramfs/init.sh

@@ -28,16 +28,13 @@ setup_log
 setup_firmware_path
 
 if [ "$IN_CI" = "false" ]; then
-	# shellcheck disable=SC2154
-	load_modules /lib/modules/initramfs.load "libcomposite"
 	setup_framebuffer
 	show_splash "Loading..."
-	setup_mdev
-	setup_dynamic_partitions "${deviceinfo_super_partitions:=}"
-else
-	# loads all modules
-	setup_udev
 fi
+
+setup_udev
+setup_dynamic_partitions "${deviceinfo_super_partitions:=}"
+
 run_hooks /hooks
 
 if [ "$IN_CI" = "true" ]; then

main/postmarketos-initramfs/init_functions.sh

@@ -67,31 +67,19 @@ setup_firmware_path() {
 	echo -n /lib/firmware/postmarketos >$SYS
 }
 
-# shellcheck disable=SC3043
-load_modules() {
-	local file="$1"
-	local modules="$2"
-	[ -f "$file" ] && modules="$modules $(grep -v ^\# "$file")"
-	# shellcheck disable=SC2086
-	modprobe -a $modules
-}
-
-setup_mdev() {
-	# Start mdev daemon
-	mdev -d
-}
-
 setup_udev() {
-	# Use udev to coldplug all devices so that they can be used via libinput (e.g.
-	# by unl0kr). This is the same series of steps performed by the udev,
+	if ! command -v udevd > /dev/null || ! command -v udevadm > /dev/null; then
+		echo "ERROR: udev not found!"
+		return
+	fi
+
+	# This is the same series of steps performed by the udev,
 	# udev-trigger and udev-settle RC services. See also:
 	# - https://git.alpinelinux.org/aports/tree/main/eudev/setup-udev
 	# - https://git.alpinelinux.org/aports/tree/main/udev-init-scripts/APKBUILD
-	if command -v udevd > /dev/null && command -v udevadm > /dev/null; then
-		udevd -d
-		udevadm trigger --type=devices --action=add
-		udevadm settle
-	fi
+	udevd -d --resolve-names=never
+	udevadm trigger --type=devices --action=add
+	udevadm settle
 }
 
 get_uptime_seconds() {

main/postmarketos-initramfs/mdev.conf

-#
-# This is an mdev config for the postmarketOS initramfs
-#
-
-# Devices:
-# Syntax: %s %d:%d %s
-# devices user:group mode
-
-$MODALIAS=.*	0:0	0660	@modprobe -q -b "$MODALIAS"
-
-# null does already exist; therefore ownership has to be changed with command
-null	0:0 0666	@chmod 666 $MDEV
-zero	0:0 0666
-full	0:0 0666
-
-random	0:0 0666
-urandom	0:0 0444
-hwrandom 0:0 0660
-
-console 0:0 0600
-
-kmem	0:0 0640
-mem	0:0 0640
-
-# Set up /dev/disk/by-* symlinks
-dasd.*		0:0 0660 */lib/mdev/persistent-storage
-mmcblk.*	0:0 0660 */lib/mdev/persistent-storage
-nbd.*		0:0 0660 */lib/mdev/persistent-storage
-nvme.*		0:0 0660 */lib/mdev/persistent-storage
-sd[a-z].*	0:0 0660 */lib/mdev/persistent-storage
-sr[0-9]+	0:0 0660 */lib/mdev/persistent-storage
-vd[a-z].*	0:0 0660 */lib/mdev/persistent-storage
-xvd[a-z].*	0:0 0660 */lib/mdev/persistent-storage