From 5003195bc9939995fd9be199aa752e9ba5f4cbb6 Mon Sep 17 00:00:00 2001
From: Isaac Kurth <isaac.kurth@ibm.com>
Date: Tue, 7 Sep 2021 22:04:14 +0000
Subject: mmc-init: Enable factory reset from gpio change

The factory-reset-toggle GPIO can have its state changed by physically
toggling SWITCH_RESET_N. If this GPIO is in a different state than it
was during the last boot, it triggers a BMC factory reset.

Tested: Added extra files to /var. Verified that a reset from a
physical toggle caused these files to be removed. Verified that resets
from the REST API and from setting rwreset to true still function
properly. Verified that repeated rebooting without calling for a reset
does not inadvertently trigger a reset.

Signed-off-by: Isaac Kurth <isaac.kurth@ibm.com>
Change-Id: I3cf3f9519033db240c0db2eec35a5b09b8fefdf2
---
 .../initrdscripts/phosphor-mmc-init.bb             |  1 +
 .../initrdscripts/phosphor-mmc-init/mmc-init.sh    | 25 +++++++++++++++++-----
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init.bb b/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init.bb
index 88807c0f0..96c27da12 100644
--- a/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init.bb
+++ b/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init.bb
@@ -13,6 +13,7 @@ RDEPENDS:${PN} += " \
     e2fsprogs-e2fsck \
     e2fsprogs-mke2fs \
     gptfdisk \
+    libgpiod-tools \
     parted \
     udev \
 "
diff --git a/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh b/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh
index 575b7605a..ad9748e65 100644
--- a/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh
+++ b/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh
@@ -10,6 +10,9 @@ get_root() {
 
 fslist="proc sys dev run"
 rodir=/mnt/rofs
+mmcdev="/dev/mmcblk0"
+rwfsdev="/dev/disk/by-partlabel/rwfs"
+
 cd /
 mkdir -p $fslist
 mount dev dev -tdevtmpfs
@@ -19,7 +22,6 @@ mount tmpfs run -t tmpfs -o mode=755,nodev
 
 # Wait up to 5s for the mmc device to appear. Continue even if the count is
 # exceeded. A failure will be caught later like in the mount command.
-mmcdev="/dev/mmcblk0"
 count=0
 while [ $count -lt 5 ]; do
     if [ -e "${mmcdev}" ]; then
@@ -48,16 +50,29 @@ if ! mount /dev/disk/by-partlabel/"$(get_root)" $rodir -t ext4 -o ro; then
     /bin/sh
 fi
 
-rwfsdev="/dev/disk/by-partlabel/rwfs"
+# Determine if a factory reset has been requested
 mkdir -p /var/lock
-if test $(fw_printenv -n rwreset) = "true"; then
+resetval=$(fw_printenv -n rwreset 2>/dev/null)
+gpiopresent=$(gpiofind factory-reset-toggle)
+if [ $? -eq 0 ]; then
+    gpioval=$(gpioget $gpiopresent)
+else
+    gpioval=""
+fi
+# Prevent unnecessary resets on first boot
+if [ -n "$gpioval" -a -z "$resetval" ]; then
+    fw_setenv rwreset $gpioval
+    resetval=$gpioval
+fi
+if [ "$resetval" = "true" -o -n "$gpioval" -a "$resetval" != "$gpioval" ]; then
     echo "Factory reset requested."
     if ! mkfs.ext4 -F "${rwfsdev}"; then
         echo "Reformat for factory reset failed."
         /bin/sh
     else
-        fw_setenv rwreset
-        echo "Formatting of rwfs is complete."
+        # gpioval will be an empty string if factory-reset-toggle was not found
+        fw_setenv rwreset $gpioval
+        echo "rwfs has been formatted."
     fi
 fi
 
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