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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (C) 2026 by Richard Qin
dc_create_image() {
local size=$1
mkdir -p "$DC_INSTANCE_DIR" "$DC_ROOT"
truncate -s "$size" "$DC_IMAGE"
mkfs.ext4 -F -q -L DEBIAN_CONTAINER "$DC_IMAGE"
}
dc_resize_image() {
local size=$1
local current_size
local target_size
local allocated_blocks
local block_size
dc_require_commands e2fsck findmnt numfmt resize2fs stat truncate
if findmnt --mountpoint "$DC_ROOT" >/dev/null 2>&1; then
dc_die "实例仍处于挂载状态：$DC_INSTANCE"
fi
current_size=$(stat -c '%s' "$DC_IMAGE")
target_size=$(numfmt --from=iec "$size")
((target_size > current_size)) || dc_die "扩容大小必须大于当前镜像大小：$current_size bytes"
truncate -s "$size" "$DC_IMAGE"
if e2fsck -f -y "$DC_IMAGE"; then
:
else
[[ $? -eq 1 ]] || dc_die "文件系统检查失败：$DC_IMAGE"
fi
resize2fs "$DC_IMAGE"
}
dc_status_image() {
local allocated_blocks
local block_size
if [[ -f "$DC_IMAGE" ]]; then
allocated_blocks=$(stat -c '%b' "$DC_IMAGE")
block_size=$(stat -c '%B' "$DC_IMAGE")
echo "逻辑大小：$(stat -c '%s' "$DC_IMAGE") bytes"
echo "实际占用：$((allocated_blocks * block_size)) bytes"
else
echo '镜像：不存在'
fi
}
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