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base-image-script/bootstrap-rootfs.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+DEBIAN_RELEASE=${VERSION:-"buster"}
+ROOTFS_DIR="debian-${DEBIAN_RELEASE}"
+
+echo "[INFO] Bootstrapping Debian $DEBIAN_RELEASE rootfs..."
+apt-get update
+apt-get install -y --no-install-recommends debootstrap bzip2
+
+debootstrap --verbose --variant=minbase --components=main,contrib,non-free \
+  --include=apt,ca-certificates --arch=amd64 "$DEBIAN_RELEASE" "$ROOTFS_DIR" \
+  http://deb.debian.org/debian/
+
+for dir in dev dev/pts proc sys; do
+  mount --bind "/$dir" "$ROOTFS_DIR/$dir"
+done
+
+echo "[CHROOT] Configuring Debian system..."
+chroot "$ROOTFS_DIR" /bin/bash <<'EOF'
+echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/10-assume_yes
+apt-get update
+apt-get upgrade
+apt-get install --no-install-recommends software-properties-common bash wget curl nano locales
+echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen
+locale-gen
+update-locale LANG=en_US.UTF-8
+apt-get remove --purge --allow-remove-essential pinentry-curses whiptail kmod iptables iproute2 dmidecode || true
+apt-get clean
+apt-get install -f
+find /var/lib/apt/lists/ -type f -delete
+EOF
+
+echo "[INFO] Unmounting system directories (ignore errors)..."
+for dir in sys proc dev/pts dev; do
+  umount -lf "$ROOTFS_DIR/$dir" 2>/dev/null || true
+done
+
+echo "[INFO] Creating compressed base image..."
+mkdir -p "/output/$DEBIAN_RELEASE"
+TARBALL="/output/$DEBIAN_RELEASE/debian-${DEBIAN_RELEASE}.tar.bz2"
+tar -cjf "$TARBALL" -C "$ROOTFS_DIR" .
+echo "[INFO] Tarball ready: $TARBALL"