64 lines
1.5 KiB
Bash
64 lines
1.5 KiB
Bash
#!/bin/sh
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# 增量更新 /data 分区
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# swupdate 已将 data_update.tar.gz 写到 /tmp/data_update.tar.gz
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# 只在 postinst 阶段执行（此时 rawfile 已经复制完成）
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if [ "$1" = "preinst" ]; then
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echo "[update_data] preinst: skip"
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exit 0
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fi
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TAR="/tmp/data_update.tar.gz"
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SRC="/tmp/data_update_src"
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DST="/mnt/data_update"
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if [ ! -f "$TAR" ]; then
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echo "[update_data] ERROR: $TAR not found"
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exit 1
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fi
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# 挂载 data 分区到临时挂载点
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mkdir -p "$DST"
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if ! mount -t ubifs ubi2:data "$DST"; then
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echo "[update_data] ERROR: failed to mount ubi2:data"
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exit 1
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fi
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echo "[update_data] mounted ubi2:data on $DST"
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# 解压到临时目录
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mkdir -p "$SRC"
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tar -xzf "$TAR" -C "$SRC"
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# 遍历升级包中的所有文件，只覆盖不一样的
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find "$SRC" -type f | while read src_file; do
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rel_path="${src_file#$SRC/}"
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dst_file="$DST/$rel_path"
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# 目标目录不存在则创建
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dst_dir=$(dirname "$dst_file")
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[ -d "$dst_dir" ] || mkdir -p "$dst_dir"
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if [ -f "$dst_file" ]; then
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src_md5=$(md5sum "$src_file" | cut -d' ' -f1)
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dst_md5=$(md5sum "$dst_file" | cut -d' ' -f1)
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if [ "$src_md5" = "$dst_md5" ]; then
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echo "[update_data] unchanged: $rel_path"
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continue
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fi
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fi
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cp "$src_file" "$dst_file"
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echo "[update_data] updated: $rel_path"
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done
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# 清理临时文件
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rm -rf "$SRC" "$TAR"
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# 卸载 data 分区
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sync
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umount "$DST"
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echo "[update_data] unmounted $DST"
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echo "[update_data] done"
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exit 0
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