add a basic hack pkg (without any complicated process)

does three things (startprocess.sh):
1. replacing diagnosis root password
2. enabling diagnosis mode without OTG
3. patching the customized updater script with key detections

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/FwUpdater/LICENSE

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+MIT License
+
+Copyright (c) 2018 Jan-Gerd Tenberge
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/FwUpdater/diag_functions

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+#!/bin/sh
+
+
+
+# -- private functions --
+
+DIAG_get_usb_device ()
+{
+  echo $(( $(i2cget -y -f 1 0x35 0x04) & 0x1F ))
+}
+
+
+DIAG_get_hash ()
+{
+  md5sum | cut -f1 -d' '
+}
+
+
+DIAG_set_welcome_screen ()
+{
+  epd_fb_test gray GC16 FULL 8 0 700 1020 250 155
+}
+
+
+
+# -- public functions --
+
+DIAG_get_mode ()
+{
+  return 0
+  device_hash=$(rawdata --get_dump=diag_mode |
+                DIAG_get_hash)
+  target_hash=$(dd if=/dev/zero count=1 \
+                bs=$(echo $(rawdata --get_offset=diag_mode | cut -f3 -d:)) \
+                2>/dev/null |
+                DIAG_get_hash)
+
+  if test $(DIAG_get_usb_device) -eq 7; then
+    echo "USB key detected."
+    return 0
+  fi
+
+  if test $device_hash = $target_hash; then
+    return 0
+  fi
+
+  return 1
+}
+
+
+DIAG_enter ()
+{
+  
+  initctl start usb
+  DIAG_set_welcome_screen
+
+  return 0
+}
+
+
+DIAG_enable ()
+{
+  rawdata --set_dump=diag_mode < /dev/zero
+}
+
+
+DIAG_disable ()
+{
+  rawdata --set_dump=diag_mode < /dev/urandom
+}

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/FwUpdater/eufwupdater.sh

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+#!/bin/sh
+
+LOG_FP="/root/updater_$(date +%s).log"
+exec &>"$LOG_FP"
+
+UPDATER_BASE=$(dirname ${0})
+cd "$UPDATER_BASE"
+
+###
+### Initialize printing on screen service
+###
+
+YAFT_PID=0
+./yaft </dev/null >/tmp/pty.txt &
+YAFT_PID=$!
+pty=""
+for i in $(seq 1 10); do
+  pty="$(cat /tmp/pty.txt)"
+  if [ -n "$pty" ]; then
+    break;
+  fi
+  sleep 1
+done
+
+if [ -z "$pty" ]; then
+  echo "openpty failed"
+  kill -INT $YAFT_PID
+  exit 0;
+fi
+
+echo "will open pty $pty"
+rm "/tmp/_fifo"
+mkfifo "/tmp/_fifo"
+tee "$pty" < /tmp/_fifo &
+
+exec &>"/tmp/_fifo"
+
+###
+### Starting message
+###
+cat LICENSE
+
+./greetings.sh
+
+
+###
+### Start the process
+###
+./startprocess.sh
+
+
+###
+### Ending message
+###
+./finished.sh
+
+for i in $(seq 5 -1 1); do
+	echo "Reboot in ${i} seconds."
+	sleep 1
+done
+
+
+exit 0

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/FwUpdater/finished.sh

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+#!/bin/sh
+
+echo ""
+echo "====================================="
+echo "Done!"
+echo "====================================="
+echo ""

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/FwUpdater/greetings.sh

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+#!/bin/sh
+
+echo ""
+echo "====================================="
+echo "Welcome DPT Users"
+echo "We will begin the process soon"
+echo "Fingers crossed!"
+echo "====================================="
+echo ""

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/FwUpdater/startprocess.sh

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+#!/bin/sh
+
+ROOTPWD=/etc/passwd
+DIAGFUNC=/usr/local/bin/diag_functions
+UPDATER=/usr/local/bin/updater_check.sh
+KEY_DETECTION_TMPF=/tmp/key_pressed.log
+
+
+###
+### key detection function
+###
+detect_key_pressed () {
+    echo "---- Waiting for key pressing (${1}s count down)..."
+    tmpcontent=""
+    for i in $(seq ${1} -1 1)
+    do
+        echo "---- Waiting for response for ${i} seconds.."
+        tmpcontent="$(busybox script -c 'timeout -t 1 keyscan' -f -q ${KEY_DETECTION_TMPF})"
+        echo $tmpcontent | grep -Fq "HOME"
+        if [ $? -eq 0 ]
+        then
+            echo "---- found HOME!"
+            return 1
+        fi
+        echo $tmpcontent | grep -Fq "POWER"
+        if [ $? -eq 0 ]
+        then
+            echo "----found POWER!"
+            return 2
+        fi
+    done
+    return 0
+}
+
+
+echo ""
+echo "================================================"
+echo " Replacing diagnosis root password to 12345.."
+echo "================================================"
+if [ ! -f ${ROOTPWD} ]
+then
+    echo "!! Error: Cannot find ${ROOTPWD}, exiting.."
+    exit 0
+fi
+echo "== Original ${ROOTPWD}:"
+cat ${ROOTPWD}
+echo "== Backing up..."
+cp ${ROOTPWD} ${ROOTPWD}_bak
+echo "== Replacing..."
+# sed in place
+sed -i '/root:/c\root:$6$i2VmFAOV$sEMLa5no1zFKnEpFdobNI2dJFqGZE3sWUFJDf1Jn34vO8\.Q9EuwP5\.7aGpmwNLsyX\/lOrh285\.xSzjSHNzMau0:0:0::\/root:\/bin\/sh' $ROOTPWD
+echo "== New ${ROOTPWD}:"
+cat ${ROOTPWD}
+
+# validation
+echo "== Looking fine?"
+echo "==== If YES, do nothing, or press HOME to continue (default)..."
+echo "==== If NO, press POWER to rollback..."
+detect_key_pressed 30
+status=$?
+if [ $status -eq 2 ]
+then
+    echo "== Rolling back..."
+    # use cat to prevent permission change
+    cat ${ROOTPWD}_bak > ${ROOTPWD}
+    echo "== Current ${ROOTPWD}:"
+    cat ${ROOTPWD}
+    echo "== Done. No modifications were made."
+    exit 0
+fi
+
+
+echo ""
+echo "========================================="
+echo " Enabling diagnosis mode without OTG.."
+echo "========================================="
+echo ""
+echo "== Original ${DIAGFUNC} (30 lines):"
+head -n 30 ${DIAGFUNC}
+echo "== Backing up..."
+cp ${DIAGFUNC} ${DIAGFUNC}_bak
+echo "== Enabling..."
+# use cat to prevent permission change
+cat diag_functions > ${DIAGFUNC}
+echo "== New ${DIAGFUNC} (30 lines):"
+head -n 30 ${DIAGFUNC}
+
+# validation
+echo "== Looking fine?"
+echo "==== If YES, do nothing, or press HOME to continue (default)..."
+echo "==== If NO, press POWER to rollback..."
+detect_key_pressed 30
+status=$?
+if [ $status -eq 2 ]
+then
+    echo "== Rolling back..."
+    # use cat to prevent permission change
+    cat ${DIAGFUNC}_bak > ${DIAGFUNC}
+    echo "== Current ${DIAGFUNC} (30 lines):"
+    head -n 30 ${DIAGFUNC}
+    echo "== Done. No modifications were made."
+    exit 0
+fi
+
+
+echo ""
+echo "======================================="
+echo " Patching customized updater script.."
+echo "======================================="
+echo ""
+echo "== Original ${UPDATER} (30 lines):"
+tail -n 30 ${UPDATER}
+echo "== Backing up..."
+cp ${UPDATER} ${UPDATER}_bak
+echo "== Enabling..."
+# use cat to prevent permission change
+cat updater_check.sh > ${UPDATER}
+echo "== New ${UPDATER} (30 lines):"
+tail -n 30 ${UPDATER}
+
+# validation
+echo "== Looking fine?"
+echo "==== If YES, do nothing, or press HOME to continue (default)..."
+echo "==== If NO, press POWER to rollback..."
+detect_key_pressed 30
+status=$?
+if [ $status -eq 2 ]
+then
+    echo "== Rolling back..."
+    # use cat to prevent permission change
+    cat ${UPDATER}_bak > ${UPDATER}
+    echo "== Current ${UPDATER} (30 lines):"
+    tail -n 30 ${UPDATER}
+    echo "== Done. No modifications were made."
+    exit 0
+fi
+
+
+

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/FwUpdater/updater_check.sh

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+#!/bin/sh
+
+
+DDAT_MOUNT_PATH=/tmp/ddat
+END_USER_UPDATER_PKG=${DDAT_MOUNT_PATH}/FwUpdater.pkg
+KEY_DETECTION_TMPF=/tmp/keyDetect.log
+
+
+
+# $1 : reboot=1, shutdown 0
+local_reboot()
+{
+  umount $DDAT_MOUNT_PATH
+  sync
+  sync
+  mount -o remount,ro /
+  if [ $1 -eq 1 ]
+  then
+    /sbin/reboot
+  else
+    /sbin/poweroff
+  fi
+
+  while [ 1 ]
+  do
+   sleep 3
+  done
+}
+
+
+#########################
+# mount tmp file system
+#########################
+mount -t tmpfs tmpfs /tmp
+
+#########################
+# Button check
+#########################
+
+# animation hint
+epd_fb_test gray DU PART 0 && \
+epd_fb_test gray GC16 PART 10 0 50 50 150 50 && \
+sleep 1 && \
+epd_fb_test gray GC16 PART 10 0 50 150 150 50 && \
+sleep 1 && \
+epd_fb_test gray GC16 PART 10 0 50 250 150 50 && \
+sleep 1 &
+
+# if HOME pressed, go into diagnosis mode directly
+busybox script -c "timeout -t 3 keyscan" -f -q ${KEY_DETECTION_TMPF}
+grep -Fq "HOME" ${KEY_DETECTION_TMPF}
+if [ $? -eq 0 ]
+then
+  rm ${KEY_DETECTION_TMPF}
+  epd_fb_test gray GC16 PART 10 0 50 50 150 250
+  initctl start diag
+  exit 0
+fi
+
+# if POWER pressed, cancel and remove update
+grep -Fq "POWER" ${KEY_DETECTION_TMPF}
+if [ $? -eq 0 ]
+then
+  rm ${KEY_DETECTION_TMPF}
+  mkdir ${DDAT_MOUNT_PATH}
+  mount /dev/mmcblk0p16 ${DDAT_MOUNT_PATH}
+  change_boot_mode.sh normal
+  rm -rf ${END_USER_UPDATER_PKG}
+  local_reboot 1
+  umount ${DDAT_MOUNT_PATH}
+fi
+
+rm ${KEY_DETECTION_TMPF}
+
+
+#########################
+# End User Updater check
+#########################
+
+mkdir ${DDAT_MOUNT_PATH}
+mount /dev/mmcblk0p16 ${DDAT_MOUNT_PATH}
+if [ -f ${END_USER_UPDATER_PKG} ]
+then
+  rawdata --get_dump=sig_key > /tmp/sig.key
+  rawdata --get_dump=dec_key > /tmp/dec.key
+  start_eufwupdater.sh ${END_USER_UPDATER_PKG} /tmp /tmp/sig.key /tmp/dec.key
+  ret=$?
+  if [ $ret -eq 0 ]
+  then
+    # remove pkg, change normal boot and reboot
+    change_boot_mode.sh normal
+    rm -rf ${END_USER_UPDATER_PKG}
+    local_reboot 1
+  # elif [ $ret -eq 1 ]
+  # then
+  #   # remain pkg, keep boot mode and shutdown
+  #   local_reboot 0
+  else
+    # remove pkg, change normal boot and shutdown
+    change_boot_mode.sh normal
+    rm -rf ${END_USER_UPDATER_PKG}
+    local_reboot 0
+  fi
+fi
+
+umount ${DDAT_MOUNT_PATH}
+
+#########################
+# Diag check
+#########################
+
+initctl start diag
+exit 0
+

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/Makefile

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+all: fw.pkg
+
+fw.pkg: base.pkg payload.tar.gz
+	echo 12836160f229d466bf4f051ba26fb46697bfa748e81b279b69ad9a5bd340958e $< | openssl sha256 -c
+	cp $< $@
+	echo "55  -none  -in /tmp/anim_sig.dat" | dd bs=8 count=4 seek=67 of=$@ conv=notrunc
+	echo "00 00 00 00" | xxd -r -p >> $@
+	echo "00 00 00 00" | xxd -r -p >> $@
+	printf '%08x' $$(wc -c < payload.tar.gz) | sed -E 's/(..)(..)(..)(..)/\4\3\2\1/' | xxd -r -p | head -c 4 >> fw.pkg
+	cat payload.tar.gz >> $@
+
+
+payload.tar.gz: FwUpdater
+	[ -x $</eufwupdater.sh ]
+	tar -cvz --exclude=".*"  --numeric-owner  -f $@ $<
+
+.PHONY: all check_sig payload.tar.gz 
+
+clean:
+	-rm fw.pkg payload.tar.gz

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/Makefile.linux

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+all: fw.pkg
+
+fw.pkg: base.pkg payload.tar.gz
+	echo 12836160f229d466bf4f051ba26fb46697bfa748e81b279b69ad9a5bd340958e $< | sha256sum -c
+	cp $< $@
+	echo "55  -none  -in /tmp/anim_sig.dat" | dd bs=32 count=1 seek=536 oflag=seek_bytes of=$@ conv=notrunc
+	echo "00 00 00 00" | xxd -r -p >> $@
+	echo "00 00 00 00" | xxd -r -p >> $@
+	printf '%08x' $$(wc -c < payload.tar.gz) | \
+	  sed -r 's/(..)(..)(..)(..)/\4\3\2\1/' | \
+       	  xxd -r -p | head -c 4 >> fw.pkg
+	cat payload.tar.gz >> $@
+
+
+payload.tar.gz: FwUpdater
+	[ -x $</eufwupdater.sh ]
+	tar -cvz --exclude=".*"  --owner=0 --group=0 --numeric-owner --no-acls  --no-xattrs -f $@ $<
+
+.PHONY: all check_sig payload.tar.gz 
+
+clean:
+	-rm fw.pkg payload.tar.gz

fw_updater_packer_by_shankerzhiwu/pkg_example/hack_basics/Makefile.mac

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+all: fw.pkg
+
+fw.pkg: base.pkg payload.tar.gz
+	echo 12836160f229d466bf4f051ba26fb46697bfa748e81b279b69ad9a5bd340958e $< | openssl sha256 -c
+	cp $< $@
+	echo "55  -none  -in /tmp/anim_sig.dat" | dd bs=8 count=4 seek=67 of=$@ conv=notrunc
+	echo "00 00 00 00" | xxd -r -p >> $@
+	echo "00 00 00 00" | xxd -r -p >> $@
+	printf '%08x' $$(wc -c < payload.tar.gz) | sed -E 's/(..)(..)(..)(..)/\4\3\2\1/' | xxd -r -p | head -c 4 >> fw.pkg
+	cat payload.tar.gz >> $@
+
+
+payload.tar.gz: FwUpdater
+	[ -x $</eufwupdater.sh ]
+	tar -cvz --exclude=".*"  --numeric-owner  -f $@ $<
+
+.PHONY: all check_sig payload.tar.gz 
+
+clean:
+	-rm fw.pkg payload.tar.gz