agent: Arch support

script/install.d/00-os.sh

@@ -2,13 +2,36 @@
 
 # -----------------------------------------------------------------------------
 # Description:
-#   Print operating system information.
+#   Print operating system information and hint which installer path will run.
 #
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
+    # macOS info
     sw_vers
+    log_info "Detected macOS (OSTYPE=$OSTYPE)"
+    log_info "Package manager: Homebrew (brew)"
+    log_info "Code path: macOS-only brew scripts will run; Linux package scripts are skipped."
+
 elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
-    cat /etc/os-release
+    # Linux info
+    if [[ -r /etc/os-release ]]; then
+        cat /etc/os-release
+        # shellcheck source=/dev/null
+        . /etc/os-release
+    fi
+
+    log_info "Detected Linux (OSTYPE=$OSTYPE, ID=${ID:-unknown}, ID_LIKE=${ID_LIKE:-n/a}, NAME=${NAME:-n/a}, VERSION_ID=${VERSION_ID:-n/a})"
+
+    if command -v apt-get >/dev/null 2>&1; then
+        log_info "Package manager detected: apt-get"
+        export DOTS_PKG_MGR=apt
+    elif command -v pacman >/dev/null 2>&1; then
+        log_info "Package manager detected: pacman"
+        export DOTS_PKG_MGR=pacman
+    else
+        log_warn "No known package manager (apt-get/pacman) found on Linux."
+    fi
+
 else
     log_error "Unknown OS: $OSTYPE"
 fi