Added Login Patch

-Now patches the login and passwd binaries to allow a normal login process
-Sets the $PATH and $HOME of the root user to reflect efficient use of the environment
(These changes were moved from the ttyd installation process as it is useful to more than just ttyd)

installentware.sh

@@ -1,7 +1,8 @@
 #!/bin/sh
-
+# Modified by iamromlan to set up a proper entware environment for Quectel RM5xx series m.2 modems
 TYPE='generic'
 #|---------|-----------------|
+#| TARGET  | Quectel Modem   |
 #| ARCH    | armv7sf-k3.2    | 
 #| LOADER  | ld-linux.so.3   | 
 #| GLIBC   | 2.27            | 
@@ -41,7 +42,9 @@ uninstall_entware() {
     systemctl daemon-reload
 
     # Optionally, clean up any modifications to /etc/profile or other system files
-    # This step depends on the specific changes made by the user or the installation script
+    # Restore original link to login binary compiled by Quectel
+    rm /bin/login
+    ln /bin/login.shadow /bin/login
 
     echo -e '\033[32mInfo: Entware/OPKG has been uninstalled successfully.\033[0m'
 }
@@ -49,6 +52,7 @@ uninstall_entware() {
 # Check if /opt exists
 if [ -d /opt ]; then
     echo -e "\033[32mDo you want to uninstall Entware/OPKG first? It is already installed.\033[0m"
+    echo -e "\033[32mThis will also resore your login process to Quectel Stock\033[0m"
     echo -e "\033[32m1) Yes\033[0m"
     echo -e "\033[32m2) No\033[0m"
     echo -e "\033[32m3) Cancel\033[0m"
@@ -209,6 +213,28 @@ echo -e '\033[32mInfo: Add /opt/bin & /opt/sbin to $PATH variable\033[0m'
 echo -e '\033[32mInfo: Run export PATH=/opt/bin:/opt/sbin:$PATH to do it for this session only\033[0m'
 echo -e '\033[32mInfo: opkg at /opt/bin will be linked to /bin but any package you install with opkg will not be automatically.\033[0m'
 ln -sf /opt/bin/opkg /bin
-opkg update
+opkg update && opkg install shadow-login shadow-passwd
+    if [ "$?" -ne 0 ]; then
+        echo -e "\e[1;31mPackage installation failed. Please check your internet connection and try again.\e[0m"
+        exit 1
+    fi
+
+    # Replace the login and passwd binaries and set home for root to a writable directory
+    rm /opt/etc/shadow
+    rm /opt/etc/passwd
+    cp /etc/shadow /opt/etc/
+    cp /etc/passwd /opt/etc
+    mkdir /usrdata/root
+    mkdir /usrdata/root/bin
+    touch /usrdata/root/.profile
+    echo "# Set PATH for all shells" > /usrdata/root/.profile
+    echo "export PATH=/bin:/usr/sbin:/usr/bin:/sbin:/opt/sbin:/opt/bin:/usrdata/root/bin" >> /usrdata/root/.profile
+    chmod +x /usrdata/root/.profile
+    sed -i '1s|/home/root:/bin/sh|/usrdata/root:/bin/bash|' /opt/etc/passwd
+    rm /bin/login /usr/bin/passwd
+    ln -sf /opt/bin/login /bin
+    ln -sf /opt/bin/passwd /usr/bin/
+    echo -e "\e[1;31mPlease set your system login password.\e[0m"
+    /usr/bin/passwd
 # Remount filesystem as read-only
 mount -o remount,ro /