Improve network boot troubleshooting documentation and initramfs scripts

Update NETWORK-BOOT-TROUBLESHOOTING.md to clarify the boot process and emphasize the need to disable PXE before rebooting to ensure EEPROM updates are applied. Enhance initramfs scripts to improve DHCP lease acquisition and capture the device's IP address more reliably. Add a revision tracking feature to the initramfs build process for better version control. Modify provisioning-client.sh to ensure proper reboot handling after deployment and backup actions.

emmc-provisioning/network-boot-initramfs/provisioning-client.sh

@@ -13,7 +13,12 @@ get_mac() {
 }
 
 get_ip() {
-  hostname -I 2>/dev/null | awk '{print $1}' || echo ""
+  # Prefer IP captured by init; fallback to ip (match "inet 1.2.3.4/..." to skip inet6)
+  if [ -f /tmp/client_ip ] && [ -s /tmp/client_ip ]; then
+    cat /tmp/client_ip
+    return
+  fi
+  ip addr show dev eth0 2>/dev/null | awk '/inet [0-9]/ { print $2; exit }' | cut -d/ -f1
 }
 
 MAC=$(get_mac)
@@ -37,10 +42,14 @@ while true; do
       sleep 10
       continue
     fi
-    curl -sL "$url" | dd of="$EMMC_DEV" bs=4M status=progress conv=fsync
+    curl -sL "$url" | dd of="$EMMC_DEV" bs=4M conv=fsync 2>&1
+    sync
     echo "Deploy done. Disabling network boot on server so device boots from eMMC next time."
     curl -s -X POST "$BASE_URL/api/action-done?mac=$MAC" || true
-    exit 0
+    echo "Rebooting in 3 seconds..."
+    sleep 3
+    reboot -f 2>/dev/null || echo b > /proc/sysrq-trigger
+    sleep 60
   fi
 
   if [ "$action" = "backup" ] && [ -n "$upload_url" ]; then
@@ -50,16 +59,20 @@ while true; do
       sleep 10
       continue
     fi
-    dd if="$EMMC_DEV" bs=4M status=progress 2>/dev/null | curl -s -X POST -T - "$upload_url"
+    dd if="$EMMC_DEV" bs=4M 2>/dev/null | curl -s -X POST -T - "$upload_url"
+    sync
     echo "Backup done. Disabling network boot on server."
     curl -s -X POST "$BASE_URL/api/action-done?mac=$MAC" || true
-    exit 0
+    echo "Rebooting in 3 seconds..."
+    sleep 3
+    reboot -f 2>/dev/null || echo b > /proc/sysrq-trigger
+    sleep 60
   fi
 
   if [ "$action" = "reboot" ]; then
-    echo "Boot normally: rebooting..."
-    reboot -f 2>/dev/null || exec reboot 2>/dev/null || true
-    exit 0
+    echo "Rebooting..."
+    reboot -f 2>/dev/null || echo b > /proc/sysrq-trigger
+    sleep 60
   fi
 
   sleep 5