main/pmos-mkinitfs: wait for rootfs, framebuffer

Fix Nexus 5 (hammerhead) boot and framebuffer issues at startup by
waiting up to 10 seconds until the rootfs and /dev/fb0 have been
found. Waiting for the framebuffer device can be disabled by setting
deviceinfo_no_framebuffer=true in the deviceinfo.

main/postmarketos-mkinitfs/APKBUILD

@@ -1,5 +1,5 @@
 pkgname=postmarketos-mkinitfs
-pkgver=0.7.1
+pkgver=0.7.2
 pkgrel=0
 pkgdesc="Tool to generate initramfs images for postmarketOS"
 url="https://postmarketos.org"
@@ -23,6 +23,7 @@ package() {
 		"$pkgdir/sbin/mkinitfs"
 	mkdir -p "$pkgdir/etc/postmarketos-mkinitfs/hooks/"
 }
-sha512sums="d5abfe9a1298069e6722555c6e16223b09b36af65d879feb64d540aa6cbc009a3aa7f00528bcf656370ec37cc64f925c72ebb77813961cd6ebf22107b57ea029  init.sh.in
-4515bc6891110e9c8b1ed8d31a89818c7c222a364bdbdf90097d5d6bbdb97eb889d4dbaec78dc928aa5ff698a8e89a76338e7c63017bf8dfb93f44a293848ca0  init_functions.sh
+
+sha512sums="c8ed2697ba0368b907eaefe7544bff8539adc7e8247af6bd425c722e3cedeb34e303f6bd9e00f283921352bc43dff3db83f3b3c1f427ef597ac15323f1e9c3eb  init.sh.in
+8ca82bfa1e092885882df36a3628d653457522b39f60457f29d7cddfc81df470e479d8e7bb51011de2d312ffdf35b785c511f1a32e5952403be819548b2ace23  init_functions.sh
 4c8a999009bc7e909bc1848c8c2421cb5f79f2603ee210b8f8c145f47c31a9e56e1861cffe742fcfd3c7bbb315e37dbe347bb5ac602f45eeccc0e40516889618  mkinitfs.sh"

main/postmarketos-mkinitfs/init.sh.in

@@ -12,11 +12,10 @@ mount_proc_sys_dev
 setup_log
 # shellcheck disable=SC2154,SC2086
 [ -d /lib/modules ] && modprobe -a ${deviceinfo_modules_initfs} ext4
+
 setup_mdev
 mount_subpartitions
-
-# Fix for framebuffer drivers, which do not have a default mode
-set_framebuffer_mode
+setup_framebuffer
 
 # Hooks
 for hook in /etc/postmarketos-mkinitfs/hooks/*.sh; do

main/postmarketos-mkinitfs/init_functions.sh

@@ -42,25 +42,34 @@ mount_subpartitions() {
 	# Do not create subpartition mappings if pmOS_boot
 	# already exists (e.g. installed on an sdcard)
 	blkid |grep -q "pmOS_boot"  && return
-
-	for i in /dev/mmcblk*; do
-		case "$(kpartx -l "$i" 2>/dev/null | wc -l)" in
-			2)
-				echo "Mount subpartitions of $i"
-				kpartx -afs "$i"
-				# Ensure that this was the *correct* subpartition
-				# Some devices have mmc partitions that appear to have
-				# subpartitions, but aren't our subpartition.
-				if blkid | grep -q "pmOS_boot"; then
-					break
-				fi
-				kpartx -d "$i"
-				continue
-				;;
-			*)
-				continue
-				;;
-		esac
+	attempt_count=0
+	echo "Trying to mount subpartitions for 10 seconds..."
+	while [ -z "$(find_boot_partition)" ]; do
+		for i in /dev/mmcblk*; do
+			case "$(kpartx -l "$i" 2>/dev/null | wc -l)" in
+				2)
+					echo "Mount subpartitions of $i"
+					kpartx -afs "$i"
+					# Ensure that this was the *correct* subpartition
+					# Some devices have mmc partitions that appear to have
+					# subpartitions, but aren't our subpartition.
+					if blkid | grep -q "pmOS_boot"; then
+						break
+					fi
+					kpartx -d "$i"
+					continue
+					;;
+				*)
+					continue
+					;;
+			esac
+		done
+		attempt_count=$(( attempt_count + 1 ));
+		if [ "$attempt_count" -gt "100" ]; then
+			echo "ERROR: failed to mount subpartitions!"
+			return;
+		fi
+		sleep 0.1;
 	done
 }
 
@@ -335,6 +344,30 @@ set_framebuffer_mode() {
 	echo "$_mode" > /sys/class/graphics/fb0/mode
 }
 
+setup_framebuffer() {
+	# Skip for non-framebuffer devices
+	# shellcheck disable=SC2154
+	if [ "$deviceinfo_no_framebuffer" = "true" ]; then
+		echo "NOTE: Skipping framebuffer setup (deviecinfo_no_framebuffer)"
+		return
+	fi
+
+	# Wait for /dev/fb0
+	echo "NOTE: Waiting 10 seconds for the framebuffer /dev/fb0."
+	echo "If your device does not have a framebuffer, disable this with:"
+	echo "no_framebuffer=true in <https://postmarketos.org/deviceinfo>"
+	for i in $(seq 1 100); do
+		[ -e "/dev/fb0" ] && break
+		sleep 0.1
+	done
+	if ! [ -e "/dev/fb0" ]; then
+		echo "ERROR: /dev/fb0 did not appear!"
+		return
+	fi
+
+	set_framebuffer_mode
+}
+
 loop_forever() {
 	while true; do
 		sleep 1