Implement dynamic shebang detection and permission handling

Added logic to determine and set the appropriate shebang for scripts based on available interpreters. Enhanced permission handling for scripts based on user privileges.

mealie/rootfs/run.txt

@@ -10,16 +10,67 @@ touch /started
 # Starting scripts #
 ####################
 
+candidate_shebangs+=(
+    "/usr/bin/env bashio"
+    "/usr/bin/bashio"
+    "/usr/bin/bash"
+    "/usr/bin/sh"
+    "/bin/bash"
+    "/bin/sh"
+)
+
+# Find the first valid shebang interpreter in candidate list
+shebang=""
+for candidate in "${candidate_shebangs[@]}"; do
+    command_path="${candidate%% *}"
+    # Test if command exists and can actually execute a shell command (for shells)
+    if [ -x "$command_path" ]; then
+        # Try as both 'sh -c' and 'bashio echo' style
+        if "$command_path" -c 'echo yes' > /dev/null 2>&1 || "$command_path" echo "yes" > /dev/null 2>&1; then
+            shebang="$candidate"
+            break
+        fi
+    fi
+done
+if [ -z "$shebang" ]; then
+    echo "ERROR: No valid shebang found!"
+    exit 1
+fi
+
 for SCRIPTS in /etc/cont-init.d/*; do
     [ -e "$SCRIPTS" ] || continue
     echo "$SCRIPTS: executing"
-    chown "$(id -u)":"$(id -g)" "$SCRIPTS"
-    chmod a+x "$SCRIPTS"
-    # Change shebang if no s6 supervision
-    sed -i 's|/usr/bin/with-contenv bashio|/usr/bin/env bashio|g' "$SCRIPTS"
-    sed -i "/exit 0/d" "$SCRIPTS"
-    . "$SCRIPTS" || echo -e "\033[0;31mError\033[0m : $SCRIPTS exiting $?"
-    rm "$SCRIPTS"
+
+    # Check if run as root (UID 0)
+    if [ "$(id -u)" -eq 0 ]; then
+        # Fix permissions for root user
+        chown "$(id -u)":"$(id -g)" "$SCRIPTS"
+        chmod a+x "$SCRIPTS"
+    else
+        echo -e "\e[38;5;214m$(date) WARNING: Script executed with user $(id -u):$(id -g), things can break and chown won't work\e[0m"
+        # Disable chown and chmod commands inside the script for non-root users
+        sed -i "s/^\s*chown /true # chown /g" "$SCRIPTS"
+        sed -i "s/^\s*chmod /true # chmod /g" "$SCRIPTS"
+    fi
+
+    # Prepare to run
+    sed -i "1s|^.*|#!$shebang|" "$SCRIPTS"
+    chmod +x "$SCRIPTS"
+
+    # Optionally use 'source' to share env variables, when requested
+    if [ "${ha_entry_source:-null}" = true ]; then
+        # Replace exit with return, so sourced scripts can return errors
+        sed -i -E 's/^\s*exit ([0-9]+)/return \1 \|\| exit \1/g' "$SCRIPTS"
+        sed -i 's/bashio::exit\.nok/return 1/g' "$SCRIPTS"
+        sed -i 's/bashio::exit\.ok/return 0/g' "$SCRIPTS"
+        # shellcheck disable=SC1090
+        source "$SCRIPTS" || echo -e "\033[0;31mError\033[0m : $SCRIPTS exiting $?"
+    else
+        "$SCRIPTS" || echo -e "\033[0;31mError\033[0m : $SCRIPTS exiting $?"
+    fi
+
+    # Cleanup after execution
+    sed -i '1a exit 0' "$SCRIPTS"
 done
 
 rm /.env || true