Add configurable container image sizing with support for creating and resizing ext4 images.

Signed-off-by: Richard Qin <richard.qin.x@gmail.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/debian-container/lib/storage.sh b/debian-container/lib/storage.sh
new file mode 100644
index 0000000..e72c0b9
--- /dev/null
+++ b/debian-container/lib/storage.sh
@@ -0,0 +1,50 @@
+#!/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
+}