Refactor bashrc setup error handling

Author: buildplan

du_setup.sh

@@ -1055,8 +1055,9 @@ configure_custom_bashrc() {
     local USERNAME="$2"
     local BASHRC_PATH="$USER_HOME/.bashrc"
     local temp_source_bashrc=""
+    local keep_temp_source_on_error=false
 
-    trap 'rm -f "$temp_source_bashrc" 2>/dev/null' RETURN ERR INT TERM
+    trap 'rm -f "$temp_source_bashrc" 2>/dev/null' INT TERM
 
     if ! confirm "Replace default .bashrc for '$USERNAME' with a custom one?" "n"; then
         print_info "Skipping custom .bashrc configuration."
@@ -1074,7 +1075,7 @@ configure_custom_bashrc() {
     fi
     chmod 600 "$temp_source_bashrc"
 
-    if ! cat > "$temp_source_bashrc" <<'EOF'; then
+    if ! cat > "$temp_source_bashrc" <<'EOF'
 # shellcheck shell=bash
 # ===================================================================
 #   Universal Portable .bashrc for Modern Terminals
@@ -2237,6 +2238,7 @@ alias commands='compgen -A function -A alias | grep -v "^_" | sort | column'
 # - Consider moving rarely-used functions to separate files
 # - Use 'time bash -i -c exit' to measure startup time
 EOF
+    then
         print_error "Failed to write .bashrc content to temporary file $temp_source_bashrc."
         log "Critical error: Failed to write bashrc content to $temp_source_bashrc."
         rm -f "$temp_source_bashrc" 2>/dev/null
@@ -2245,9 +2247,17 @@ EOF
 
     log "Successfully created temporary .bashrc source at $temp_source_bashrc"
 
+    if [[ -f "$BASHRC_PATH" ]] && ! grep -q "generated by /usr/sbin/adduser" "$BASHRC_PATH" 2>/dev/null; then
+        local BASHRC_BACKUP="$BASHRC_PATH.backup_$(date +%Y%m%d_%H%M%S)"
+        print_info "Backing up existing non-default .bashrc to $BASHRC_BACKUP"
+        cp "$BASHRC_PATH" "$BASHRC_BACKUP"
+        log "Backed up existing .bashrc to $BASHRC_BACKUP"
+    fi
+
     local temp_fallback_path="/tmp/custom_bashrc_for_${USERNAME}.txt"
 
-    if ! tee "$BASHRC_PATH" < "$temp_source_bashrc" > /dev/null; then
+    if ! tee "$BASHRC_PATH" < "$temp_source_bashrc" > /dev/null
+    then
         print_error "Failed to automatically write custom .bashrc to $BASHRC_PATH."
         log "Error writing custom .bashrc for $USERNAME to $BASHRC_PATH (likely permissions issue)."
 
@@ -2260,6 +2270,7 @@ EOF
             print_info "  sudo chown ${USERNAME}:${USERNAME} ${BASHRC_PATH}"
             print_info "  sudo chmod 644 ${BASHRC_PATH}"
             log "Saved custom .bashrc content to $temp_fallback_path for manual installation."
+            keep_temp_source_on_error=true
         else
             print_error "Also failed to save custom .bashrc content to $temp_fallback_path."
             log "Critical error: Failed both writing to $BASHRC_PATH and copying $temp_source_bashrc to $temp_fallback_path."
@@ -2269,18 +2280,22 @@ EOF
             print_warning "Failed to set correct ownership/permissions on $BASHRC_PATH."
             log "Failed to chown/chmod $BASHRC_PATH"
             print_warning "ACTION REQUIRED: Please manually set ownership/permissions:"
-            print_info "  sudo cp ${temp_source_bashrc} ${BASHRC_PATH} # You might need this if the file is corrupted"
             print_info "  sudo chown ${USERNAME}:${USERNAME} ${BASHRC_PATH}"
             print_info "  sudo chmod 644 ${BASHRC_PATH}"
-            temp_source_bashrc=""
+            print_info "  (Source content is in ${temp_source_bashrc})"
+            keep_temp_source_on_error=true
         else
             print_success "Custom .bashrc created for '$USERNAME'."
             log "Custom .bashrc configuration completed for $USERNAME."
             rm -f "$temp_fallback_path" 2>/dev/null
         fi
     fi
 
-    rm -f "$temp_source_bashrc" 2>/dev/null
+    if [[ "$keep_temp_source_on_error" == false ]]; then
+        rm -f "$temp_source_bashrc" 2>/dev/null
+    fi
+
+    trap - INT TERM
 
     return 0
 }