Initial commit

meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh

@@ -0,0 +1,112 @@
+#!/bin/sh
+
+kgetopt ()
+{
+    _cmdline="$(cat /proc/cmdline)"
+    _optname="$1"
+    _optval="$2"
+    for _opt in $_cmdline
+    do
+        case "$_opt" in
+            "${_optname}"=*)
+                _optval="${_opt##"${_optname}"=}"
+                ;;
+            *)
+                ;;
+        esac
+    done
+    [ -n "$_optval" ] && echo "$_optval"
+}
+
+fslist="proc sys dev run"
+rodir=/mnt/rofs
+mmcdev="/dev/mmcblk0"
+rwfsdev="/dev/disk/by-partlabel/rwfs"
+
+cd /
+
+# We want to make all the directories in $fslist, not one directory named by
+# concatonating the names with spaces
+#
+# shellcheck disable=SC2086
+mkdir -p $fslist
+
+mount dev dev -tdevtmpfs
+mount sys sys -tsysfs
+mount proc proc -tproc
+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.
+count=0
+while [ $count -lt 5 ]; do
+    if [ -e "${mmcdev}" ]; then
+        break
+    fi
+    sleep 1
+    count=$((count + 1))
+done
+
+# Move the secondary GPT to the end of the device if needed. Look for the GPT
+# header signature "EFI PART" located 512 bytes from the end of the device.
+if ! tail -c 512 "${mmcdev}" | hexdump -C -n 8 | grep -q "EFI PART"; then
+    sgdisk -e "${mmcdev}"
+    partprobe
+fi
+
+# There eMMC GPT labels for the rootfs are rofs-a and rofs-b, and the label for
+# the read-write partition is rwfs. Run udev to make the partition labels show
+# up. Mounting by label allows for partition numbers to change if needed.
+udevd --daemon
+udevadm trigger --type=devices --action=add
+udevadm settle --timeout=10
+
+mkdir -p $rodir
+if ! mount /dev/disk/by-partlabel/"$(kgetopt root=PARTLABEL)" $rodir -t ext4 -o ro; then
+    /bin/sh
+fi
+
+# Determine if a factory reset has been requested
+mkdir -p /var/lock
+resetval=$(fw_printenv -n rwreset 2>/dev/null)
+if gpiopresent=$(gpiofind factory-reset-toggle) ; then
+    # gpiopresent contains both the gpiochip and line number as
+    # separate words, and gpioget needs to see them as such.
+    # shellcheck disable=SC2086
+    gpioval=$(gpioget $gpiopresent)
+else
+    gpioval=""
+fi
+# Prevent unnecessary resets on first boot
+if [ -n "$gpioval" ] && [ -z "$resetval" ]; then
+    fw_setenv rwreset "$gpioval"
+    resetval=$gpioval
+fi
+if [ "$resetval" = "true" ] || [ -n "$gpioval" ] && [ "$resetval" != "$gpioval" ]; then
+    echo "Factory reset requested."
+    if ! mkfs.ext4 -F "${rwfsdev}"; then
+        echo "Reformat for factory reset failed."
+        /bin/sh
+    else
+        # gpioval will be an empty string if factory-reset-toggle was not found
+        fw_setenv rwreset "$gpioval"
+        echo "rwfs has been formatted."
+    fi
+fi
+
+fsck.ext4 -p "${rwfsdev}"
+if ! mount "${rwfsdev}" $rodir/var -t ext4 -o rw; then
+    /bin/sh
+fi
+
+rm -rf $rodir/var/persist/etc-work/
+mkdir -p $rodir/var/persist/etc $rodir/var/persist/etc-work $rodir/var/persist/home/root
+mount overlay $rodir/etc -t overlay -o lowerdir=$rodir/etc,upperdir=$rodir/var/persist/etc,workdir=$rodir/var/persist/etc-work
+
+init="$(kgetopt init /sbin/init)"
+
+for f in $fslist; do
+    mount --move "$f" "$rodir/$f"
+done
+
+exec switch_root $rodir "$init"