boot straight into the installer from the live ISO

live/init

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+#!/bin/sh
+# Keru live ISO init — jumps straight into the installer.
+#
+# The live ISO carries only the installer. On boot this script:
+#   1. mounts the virtual filesystems
+#   2. attaches the read-only installer root (squashfs, plain initramfs, or
+#      an unattached block device)
+#   3. execs installer/install.sh on the console — so you boot, choose, and it
+#      crafts and installs the system. No shell prompt in the way.
+#   4. if the installer exits (e.g. you declined to build), drops to an
+#      emergency shell instead of leaving you stranded.
+#
+# Ultra-minimal by design: /bin/sh is busybox. No init system in the live env.
+
+# ---- console -----------------------------------------------------------
+# Redirect the console early so messages land where you can see them.
+CONSOLE="${console:-/dev/tty1}"
+exec <"$CONSOLE" >"$CONSOLE" 2>"$CONSOLE"
+
+# ---- virtual filesystems ----------------------------------------------
+mount -t proc     proc /proc 2>/dev/null
+mount -t sysfs    sys  /sys  2>/dev/null
+mount -t devtmpfs dev  /dev  2>/dev/null || (mkdir -p /dev && mount -t tmpfs dev /dev 2>/dev/null)
+mkdir -p /dev/pts /dev/shm
+mount -t devpts   devpts /dev/pts 2>/dev/null
+mount -t tmpfs    tmpfs  /dev/shm  2>/dev/null
+
+# ---- locate the installer root ----------------------------------------
+# Where the installer payload lives. Tried in order:
+#   1. $root — whatever the kernel booted (a squashfs / overlay already handled
+#      by an initramfs that then hands off here).
+#   2. a squashfs node named *.sfs on a known device (label=KERU).
+#   3. nothing — the installer is already on the root we're running from.
+case "${root:-}" in
+    /dev/*)
+        # re-mount as the boot-time root: cannot pivot here, so use it directly
+        /bin/busybox mount -o move / "$root" 2>/dev/null || true
+        ;;
+    '')
+        for _dev in /dev/disk/by-label/KERU*; do
+            [ -e "$_dev" ] || continue
+            _node="$(readlink -f "$_dev")"
+            mount "$_node" /squash 2>/dev/null || continue
+            INSTALLER=/squash
+            break
+        done
+        ;;
+esac
+INSTALLER="${INSTALLER:-/}"
+
+# ---- launch the installer ---------------------------------------------
+if [ -e "$INSTALLER/installer/install.sh" ]; then
+    printf '\n[ keru ] booting installer...\n'
+    cd "$INSTALLER" && exec /bin/sh "$INSTALLER/installer/install.sh"
+fi
+
+# If we land here the installer is missing or returned. Never strand someone:
+# fall back to an interactive rescue shell.
+printf '\n[ keru ] installer not found or exited.\n'
+printf '[ keru ] dropping to an emergency shell. (installer path: %s)\n' "$INSTALLER"
+exec /bin/sh