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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (C) 2026 by Richard Qin
dc_init() {
local tarball=
while (($# > 0)); do
case "$1" in
--tarball)
(($# >= 2)) || dc_die '--tarball 需要一个文件路径。'
tarball=$2
shift 2
;;
--help|-h)
dc_usage
return 0
;;
*)
dc_die "未知的 init 选项：$1"
;;
esac
done
dc_require_commands debootstrap unshare mkfs.ext4 mount chroot setpriv flock
if [[ -n "$tarball" ]]; then
tarball=$(readlink -f -- "$tarball")
[[ -f "$tarball" ]] || dc_die "找不到 tarball：$tarball"
fi
if [[ -e "$DC_INSTANCE_DIR" ]]; then
dc_die "实例已存在：$DC_INSTANCE。请使用 enter 进入，避免覆盖容器数据。"
fi
mkdir -p "$DC_INSTANCE_DIR" "$DC_ROOT"
truncate -s 3G "$DC_IMAGE"
mkfs.ext4 -F -q -L DEBIAN_CONTAINER "$DC_IMAGE"
if [[ -n "$tarball" ]]; then
unshare --mount --propagation private -- bash "$DC_SCRIPT" _init "$DC_INSTANCE" "$tarball"
else
unshare --mount --propagation private -- bash "$DC_SCRIPT" _init "$DC_INSTANCE"
fi
echo "初始化完成。执行 sudo bash $DC_SCRIPT enter $DC_INSTANCE 进入容器。"
}
dc_init_rootfs() {
local tarball=${1:-}
local -a include_packages=()
dc_mount_root
trap dc_cleanup_mounts EXIT
if [[ -n "$tarball" ]]; then
debootstrap \
--variant=minbase \
--unpack-tarball="$tarball" \
"$DC_SUITE" "$DC_ROOT" "$DC_MIRROR"
else
debootstrap \
--variant=minbase \
"$DC_SUITE" "$DC_ROOT" "$DC_MIRROR"
fi
rm -f "$DC_ROOT/etc/resolv.conf"
cp -L /etc/resolv.conf "$DC_ROOT/etc/resolv.conf"
dc_mount_virtual_filesystems
if [[ -z "$tarball" ]]; then
IFS=, read -r -a include_packages <<< "$DC_INCLUDE"
chroot "$DC_ROOT" /usr/bin/env DEBIAN_FRONTEND=noninteractive /usr/bin/apt-get update
chroot "$DC_ROOT" /usr/bin/env DEBIAN_FRONTEND=noninteractive /usr/bin/apt-get install -y "${include_packages[@]}"
fi
echo debian-container > "$DC_ROOT/etc/hostname"
}
dc_base_create() {
local output=${1:-$DC_TARBALL}
local temporary_root
(($# <= 1)) || dc_die '用法：base-create [tarball 路径]'
output=$(readlink -m -- "$output")
[[ ! -e "$output" ]] || dc_die "tarball 已存在：$output"
dc_require_commands debootstrap mktemp readlink
mkdir -p "$(dirname -- "$output")"
temporary_root=$(mktemp -d)
(
trap 'rm -rf -- "$temporary_root"' EXIT
debootstrap \
--variant=minbase \
--include="$DC_INCLUDE" \
--make-tarball="$output" \
"$DC_SUITE" "$temporary_root" "$DC_MIRROR"
)
echo "基础 tarball 已创建：$output"
}
dc_enter() {
[[ -f "$DC_IMAGE" ]] || dc_die '没有找到镜像，请先运行 init。'
# 单独创建网络命名空间，暂时没有联网功能。
unshare --mount --uts --ipc --pid --net --fork --propagation private -- bash "$DC_SCRIPT" _enter "$DC_INSTANCE"
}
dc_enter_rootfs() {
dc_mount_root
trap dc_cleanup_mounts EXIT
dc_mount_virtual_filesystems
hostname debian-container
echo '已进入独立的 Debian 实验环境；输入 exit 可退出容器。'
# 完成挂载后撤销一些宿主级危险权限，保留 CAP_LINUX_IMMUTABLE。
setpriv --bounding-set=-sys_admin,-net_admin,-net_raw,-sys_module,-sys_boot,-sys_time,-sys_rawio,-sys_ptrace,-syslog -- \
chroot "$DC_ROOT" /bin/bash -l
}
dc_exec() {
(($# > 0)) || dc_die '用法：exec NAME -- 命令 [参数...]'
[[ "$1" == -- ]] || dc_die '用法：exec NAME -- 命令 [参数...]'
shift
(($# > 0)) || dc_die 'exec 需要一个命令。'
[[ -f "$DC_IMAGE" ]] || dc_die '没有找到镜像，请先运行 init。'
unshare --mount --uts --ipc --pid --net --fork --propagation private -- \
bash "$DC_SCRIPT" _exec "$DC_INSTANCE" "$@"
}
dc_exec_rootfs() {
dc_mount_root
trap dc_cleanup_mounts EXIT
dc_mount_virtual_filesystems
hostname debian-container
setpriv --bounding-set=-sys_admin,-net_admin,-net_raw,-sys_module,-sys_boot,-sys_time,-sys_rawio,-sys_ptrace,-syslog -- \
chroot "$DC_ROOT" "$@"
}
dc_status() {
echo "实例：$DC_INSTANCE"
echo "目录：$DC_INSTANCE_DIR"
if [[ -f "$DC_IMAGE" ]]; then
echo '镜像：存在'
else
echo '镜像：不存在'
fi
}
dc_delete() {
[[ -d "$DC_INSTANCE_DIR" ]] || { echo 'Debian 实例已不存在。'; return 0; }
dc_require_commands findmnt
if findmnt --mountpoint "$DC_ROOT" >/dev/null 2>&1; then
dc_die "实例仍处于挂载状态：$DC_INSTANCE"
fi
rm -rf -- "$DC_INSTANCE_DIR"
echo "Debian 实例已删除：$DC_INSTANCE"
}
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