postmarketos-initramfs: better wait_[br]oot_partition

Rework the messages and avoid re-spawning the splash on every check.
Additionally, add a call to check_keys, this lets users drop to a debug
shell or export logs to triage this failure (particularly useful for
hard-to-reproduce issues).

Finally, add a (liberal) 30 second timeout and dump logs at the end. If
we're just waiting for a device to show up and it doesn't after 30
seconds then it's probably never going to...

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

main/postmarketos-initramfs/APKBUILD

@@ -92,7 +92,7 @@ ab41b45b0613f25a61114ed8c8b92bc53c60838f6e2e0ba18c76e5369b2984e6023a066188769267
 ede9eb44fe180578ca97b7abfa2c4f1b4e277a49e4ca8b8911005acd844dbce38f200bc84280ded5a35fe5abd32bec391efc4af1929db12aa52da0c1036c6983  00-initramfs-fullsize.files
 8a4adad3785af474b36a09a05f6a3b2c4b4f43aac331a53b903abfa51ea12be1e3d1d807b7a6e66a1346815f3b0044daf8cd62e21e2dc75d2db13ee265a72985  00-initramfs-extra-base.files
 42ff1c71326ce8ad1f023031b3aa3d96e2b6ab5daf035a363f59a9c17255a348d59adbe808d44f6c31cb03a1c4a0278111c8b7842b7cf1854c1693db3836b7a9  init.sh
-167e3ebdc6f7bc77e0d3f03c671a90ce14c3979914b377f86efdcbf38ccd7c8ebf91043831fd9d9cfbcd5ce99b360dd4088d2935b1b39633e57c2a626bbc3b99  init_functions.sh
+428ba0fa6497a253d480d010bce40b68811433309b3319d45363932dc3e3c23a2bf13467a9d4caf0c081c9884d77637fc3cf8447827a236483123bf257216166  init_functions.sh
 ba3275a9af788c7c782322a22a0f144d5e50e3498ea6886486a29331f23ae89cd32d500a3635cfa7cab369afba92edc18aeca64ccbf0cd589061cce23d15b46c  unudhcpd.conf
 675e7d5bee39b2df7d322117f8dcaccc274d61beaf4d50ead19bbf2109446d64b1c0aa0c5b4f9846eb6c1c403418f28f6364eff4537ba41120fbfcbc484b7da7  mdev.conf
 "

main/postmarketos-initramfs/init_functions.sh

@@ -361,23 +361,41 @@ extract_initramfs_extra() {
 }
 
 wait_boot_partition() {
-	while [ -z "$(find_boot_partition)" ]; do
-		show_splash "ERROR: boot partition not found, retrying...\\nhttps://postmarketos.org/troubleshooting"
-		echo "Could not find the boot partition."
-		echo "If your install is on a removable disk, maybe you need to insert it?"
-		echo "Trying again..."
+	if [ -n "$PMOS_BOOT" ]; then
+		return
+	fi
+
+	show_splash "Waiting for boot partition...\\nhttps://postmarketos.org/troubleshooting"
+	for _ in $(seq 1 30); do
+		if [ -n "$(find_boot_partition)" ]; then
+			return
+		fi
+		echo "Waiting for boot partition..."
 		sleep 1
+		check_keys ""
 	done
+
+	show_splash "ERROR: Boot partition not found!\\nhttps://postmarketos.org/troubleshooting"
+	fail_halt_boot
 }
 
 wait_root_partition() {
-	while [ -z "$(find_root_partition)" ]; do
-		show_splash "ERROR: root partition not found, retrying...\\nhttps://postmarketos.org/troubleshooting"
-		echo "Could not find the rootfs."
-		echo "If your install is on a removable disk, maybe you need to insert it?"
-		echo "Trying again..."
+	if [ -n "$PMOS_ROOT" ]; then
+		return
+	fi
+
+	show_splash "Waiting for root partition...\\nhttps://postmarketos.org/troubleshooting"
+	for _ in $(seq 1 30); do
+		if [ -n "$(find_root_partition)" ]; then
+			return
+		fi
+		echo "Waiting for root partition..."
 		sleep 1
+		check_keys ""
 	done
+
+	show_splash "ERROR: Root partition not found!\\nhttps://postmarketos.org/troubleshooting"
+	fail_halt_boot
 }
 
 delete_old_install_partition() {