update installer and docs

installer/install.sh

@@ -46,6 +46,63 @@ pick() { # prompt, array-of-labels, defaults -> writes choice to $CHOICE
     fi
 }
 
+# ---- network check -------------------------------------------------------
+# The ISO carries only the installer. Everything else (kernels, init systems,
+# libcs, filesystems, tools) is fetched and built at install time, so a working
+# network connection is a hard prerequisite.
+require_network() {
+    local ok=0
+    # try a few reachability probes
+    for host in mirror.keru.org github.com 1.1.1.1; do
+        if command -v ping >/dev/null 2>&1 && ping -c1 -W2 "$host" >/dev/null 2>&1; then ok=1; break; fi
+        # fallback: plain connect test via /dev/tcp
+        case "$host" in
+            *.*.*.*) : ;; # ip already covered by ping
+        esac
+    done
+    if [ "$ok" = "0" ]; then
+        if command -v nc >/dev/null 2>&1; then
+            nc -z -w5 mirror.keru.org 443 >/dev/null 2>&1 && ok=1
+        fi
+    fi
+    [ "$ok" = "1" ]
+}
+
+# ---- network configuration ------------------------------------------------
+configure_network() {
+    msg "network configuration"
+    if command -v nmtui >/dev/null 2>&1; then
+        nmtui 2>/dev/null && return 0
+    fi
+    if command -v dialog >/dev/null 2>&1 && command -v wifi-menu >/dev/null 2>&1; then
+        dialog --stdout --menu "Network" 12 40 3 \
+            1 "Wireless (wifi-menu)" 2 "Ethernet (skip)" 3 "Manual (ip)" 2>/dev/null
+    fi
+    read -r -p "Bring up Ethernet (DHCP) now? [Y/n] " eth
+    case "$eth" in
+        n|N|no) : ;;
+        *) command -v dhcpcd >/dev/null 2>&1 && (dhcpcd >/dev/null 2>&1 &) || true ;;
+    esac
+}
+
+banner "Keru OS — network required"
+info "the ISO only carries the installer."
+info "the system you choose (init, libc, fs, kernel, tools) is fetched and"
+info "built from the network during installation. a connection is required."
+
+if require_network; then
+    msg "network: connected"
+else
+    warn "network: not detected"
+    read -r -p "Configure the network now? [Y/n] " cfg
+    case "$cfg" in
+        n|N|no) die "a network connection is required to install Keru" ;;
+        *) configure_network ;;
+    esac
+    require_network || die "still no network connection — cannot install"
+    msg "network: connected"
+fi
+
 # ---- swappable selections ------------------------------------------------
 banner "Keru OS — craft your system"
 
@@ -61,7 +118,10 @@ TARGET_FS="$CHOICE"
 pick "Kernel" linux linux linux-lts linux-hardened linux-cachyos linux-zen
 KERNEL="$CHOICE"
 
-pick "Network tools" nmtui networkmanager nmtui connman
+pick "Privilege elevation (sudo alternative)" doas doas sudo opendoas su
+SUDO="$CHOICE"
+
+pick "Network tools" nmtui nmtui networkmanager connman systemd-networkd
 NET="$CHOICE"
 
 # ---- assemble make.conf ------------------------------------------------
@@ -72,6 +132,7 @@ INIT=$INIT
 LIBC=$LIBC
 TARGET_FS=$TARGET_FS
 KERNEL=$KERNEL
+SUDO=$SUDO
 NET=$NET
 LICENSE_ACCEPT=(*)
 EOF