luci-app-advanced-reboot: add logger messages, README update

Signed-off-by: Stan Grishin <stangri@melmac.net>

2 files changed, 39 insertions, 2 deletions

diff --git a/applications/luci-app-advanced-reboot/README.md b/applications/luci-app-advanced-reboot/README.md
index 50ca1bc2d..5b6ce7126 100644
--- a/applications/luci-app-advanced-reboot/README.md
+++ b/applications/luci-app-advanced-reboot/README.md
@@ -44,6 +44,35 @@ If the ```luci-app-advanced-reboot``` package is not found in the official feed/
 - When you reboot to a different partition, your current settings (WiFi SSID/password, etc.) will not apply to a different partition. Different partitions might have completely different settings and even firmware.
 - If you reboot to a partition which doesn't allow you to switch boot partitions (like stock vendor firmware), you might not be able to boot back to OpenWrt unless you reflash it, losing all the settings.
 - Some devices allow you to trigger reboot to an alternative partition by interrupting boot 3 times in a row (by resetting/switching off the device or pulling power). As these methods might be different for different devices, do your own homework.
+- Newer versions of this package try to mount alternative partition on compatible NAND routers in order to retrieve detailed firmware information. When that happens, it is normal to have messages similar to the below in the system log:
+
+  ```sh
+  Tue Nov 19 15:45:03 2019 user.notice luci-app-advanced-reboot: attempting to mount alternative   partition (mtd6)
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.673826] ubi2: attaching mtd6
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.876698] ubi2: scanning is finished
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.885267] ubi2: attached mtd6 (name "rootfs1", size   74 MiB)
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.891063] ubi2: PEB size: 131072 bytes (128 KiB),   LEB size: 126976 bytes
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.898011] ubi2: min./max. I/O unit sizes: 2048/2048,   sub-page size 2048
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.904878] ubi2: VID header offset: 2048 (aligned   2048), data offset: 4096
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.911928] ubi2: good PEBs: 592, bad PEBs: 0,   corrupted PEBs: 0
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.917962] ubi2: user volume: 2, internal volumes: 1,   max. volumes count: 128
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.925252] ubi2: max/mean erase counter: 48/32, WL   threshold: 4096, image sequence number: 1659081076
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.934623] ubi2: available PEBs: 0, total reserved   PEBs: 592, PEBs reserved for bad PEB handling: 40
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.944346] ubi2: background thread "ubi_bgt2d"   started, PID 26780
+  Tue Nov 19 15:45:03 2019 kern.info kernel: [30392.952596] block ubiblock2_0: created from ubi2:0  (rootfs)
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30392.964083] UBIFS (ubi2:1): background thread   "ubifs_bgt2_1" started, PID 26787
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.009298] UBIFS (ubi2:1): UBIFS: mounted UBI device   2, volume 1, name "rootfs_data"
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.017185] UBIFS (ubi2:1): LEB size: 126976 bytes   (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.027213] UBIFS (ubi2:1): FS size: 61075456 bytes   (58 MiB, 481 LEBs), journal size 3047424 bytes (2 MiB, 24 LEBs)
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.037733] UBIFS (ubi2:1): reserved for root: 2884744   bytes (2817 KiB)
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.044389] UBIFS (ubi2:1): media format: w4/r0   (latest is w5/r0), UUID 76F0C52C-6197-4E00-B306-747262B06545, small LPT model
+  Tue Nov 19 15:45:03 2019 user.notice luci-app-advanced-reboot: attempting to unmount alternative   partition (mtd6)
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.132743] UBIFS (ubi2:1): un-mount UBI device 2
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.137481] UBIFS (ubi2:1): background thread   "ubifs_bgt2_1" stops
+  Tue Nov 19 15:45:03 2019 kern.info kernel: [30393.390961] block ubiblock2_0: released
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.396576] ubi2: detaching mtd6
+  Tue Nov 19 15:45:03 2019 kern.notice kernel: [30393.400117] ubi2: mtd6 is detached
+  ```
 
 ## Thanks
 
diff --git a/applications/luci-app-advanced-reboot/luasrc/controller/advanced_reboot.lua b/applications/luci-app-advanced-reboot/luasrc/controller/advanced_reboot.lua
index e1e63bcbf..112ac8a0d 100644
--- a/applications/luci-app-advanced-reboot/luasrc/controller/advanced_reboot.lua
+++ b/applications/luci-app-advanced-reboot/luasrc/controller/advanced_reboot.lua
@@ -15,6 +15,11 @@ local http = require "luci.http"
 local sys = require "luci.sys"
 local dispatcher = require "luci.dispatcher"
 local uci = require "luci.model.uci".cursor()
+local packageName = "luci-app-advanced-reboot"
+
+function logger(t)
+	util.exec("logger -t " .. packageName .. " '" .. tostring(t) .. "'")
+end
 
 function is_alt_mountable(p1_mtd, p2_mtd)
 	if p1_mtd:sub(1,3) == "mtd" and
@@ -33,11 +38,13 @@ function get_partition_os_info(op_ubi)
 	if fs.access("/etc/os-release") then
 		cp_info = util.trim(util.exec('. /etc/os-release && echo "$PRETTY_NAME"'))
 	end
+	logger(i18n.translate("attempting to mount alternative partition") .. " (mtd" .. tostring(op_ubi) .. ")")
 	alt_partition_unmount(op_ubi)
 	alt_partition_mount(op_ubi)
 	if fs.access("/alt/rom/etc/os-release") then
 		ap_info = util.trim(util.exec('. /alt/rom/etc/os-release && echo "$PRETTY_NAME"'))
 	end
+	logger(i18n.translate("attempting to unmount alternative partition") .. " (mtd" .. tostring(op_ubi) .. ")")
 	alt_partition_unmount(op_ubi)
 	return cp_info, ap_info
 end
@@ -58,10 +65,12 @@ function alt_partition_mount(op_ubi)
 end
 
 function alt_partition_unmount(op_ubi)
+	local mtdCount = tonumber(util.exec("ubinfo | grep 'Present UBI devices' | grep -c ','"))
+	mtdCount = mtdCount and mtdCount + 1 or 10
 --	util.exec("[ -d /alt/firmware ] && umount /alt/firmware")
 	util.exec("[ -d /alt/overlay ] && umount /alt/overlay")
 	util.exec("[ -d /alt/rom ] && umount /alt/rom")
-	for i = 0, 10 do
+	for i = 0, mtdCount do
 		if not fs.access("/sys/devices/virtual/ubi/ubi" .. tostring(i) .. "/mtd_num") then break end
 		ubi_mtd =  tonumber(util.trim(util.exec("cat /sys/devices/virtual/ubi/ubi" .. i .. "/mtd_num")))
 		if ubi_mtd and ubi_mtd == op_ubi then
@@ -266,7 +275,6 @@ function action_altreboot()
 end
 
 function action_poweroff()
-	local uci = require "luci.model.uci".cursor()
 	if http.formvalue("cancel") then
 		http.redirect(dispatcher.build_url('admin/system/advanced_reboot'))
 		return