mirror of
https://github.com/drakmor/ShadowMountPlus.git
synced 2026-10-22 06:32:25 -05:00
83 lines
2.6 KiB
Bash
83 lines
2.6 KiB
Bash
#!/bin/sh
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# For WSL2/Ubuntu/Debian: sudo apt-get install -y exfatprogs exfat-fuse fuse3 rsync
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# Create a 64 KiB-cluster exFAT image for the LVD type-5/BFS sdimg profile.
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# Usage: mkexfat.sh <input_dir> [output_file]
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set -e
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if [ -z "$1" ]; then
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echo "Usage: $0 <input_dir> [output_file]"
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exit 1
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fi
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INPUT_DIR="$1"
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OUTPUT="${2:-test.exfat}"
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if [ ! -d "$INPUT_DIR" ]; then
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echo "Error: input directory not found: $INPUT_DIR"
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exit 1
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fi
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if [ ! -f "$INPUT_DIR/eboot.bin" ]; then
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echo "Error: eboot.bin not found in source directory: $INPUT_DIR"
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exit 1
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fi
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# More accurate sizing for exFAT:
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# - file payload rounded to cluster size
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# - FAT + allocation bitmap estimates from cluster count
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# - directory/entry metadata estimate
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# - fixed metadata and runtime headroom
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CLUSTER_SIZE=65536
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MKFS_CLUSTER_ARG="64K"
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META_FIXED=$((32 * 1024 * 1024)) # boot region, upcase, root and misc
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MIN_SLACK=$((64 * 1024 * 1024)) # minimum copy/runtime safety margin
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SPARE_MIN=$((64 * 1024 * 1024)) # lower bound for dynamic headroom
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SPARE_MAX=$((512 * 1024 * 1024)) # upper bound for dynamic headroom
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ENTRY_META_BYTES=256
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FILE_COUNT=$(find "$INPUT_DIR" -type f | wc -l | tr -d ' ')
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DIR_COUNT=$(find "$INPUT_DIR" -type d | wc -l | tr -d ' ')
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RAW_FILE_BYTES=$(find "$INPUT_DIR" -type f -printf '%s\n' | \
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awk '{s += $1} END {print s + 0}')
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DATA_BYTES=$(find "$INPUT_DIR" -type f -printf '%s\n' | \
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awk -v cls="$CLUSTER_SIZE" '{s += int(($1 + cls - 1) / cls) * cls} END {print s + 0}')
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DATA_CLUSTERS=$(( (DATA_BYTES + CLUSTER_SIZE - 1) / CLUSTER_SIZE ))
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FAT_BYTES=$((DATA_CLUSTERS * 4))
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BITMAP_BYTES=$(( (DATA_CLUSTERS + 7) / 8 ))
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ENTRY_BYTES=$(( (FILE_COUNT + DIR_COUNT) * ENTRY_META_BYTES ))
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BASE_TOTAL=$((DATA_BYTES + FAT_BYTES + BITMAP_BYTES + ENTRY_BYTES + META_FIXED))
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SPARE_BYTES=$((BASE_TOTAL / 200)) # ~0.5%
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if [ "$SPARE_BYTES" -lt "$SPARE_MIN" ]; then
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SPARE_BYTES=$SPARE_MIN
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fi
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if [ "$SPARE_BYTES" -gt "$SPARE_MAX" ]; then
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SPARE_BYTES=$SPARE_MAX
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fi
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TOTAL=$((BASE_TOTAL + SPARE_BYTES))
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MIN_TOTAL=$((RAW_FILE_BYTES + MIN_SLACK))
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if [ "$TOTAL" -lt "$MIN_TOTAL" ]; then
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TOTAL=$MIN_TOTAL
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fi
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# Round up to nearest MB
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MB=$(( (TOTAL + 1024*1024 - 1) / (1024*1024) ))
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echo "Input size (raw files): $RAW_FILE_BYTES bytes"
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echo "Input size (exFAT alloc): $DATA_BYTES bytes"
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echo "Files: $FILE_COUNT, Dirs: $DIR_COUNT"
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echo "exFAT LVD/BFS profile: -c $MKFS_CLUSTER_ARG (fixed 64 KiB cluster)"
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echo "Image size: ${MB}MB"
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truncate -s "${MB}M" "$OUTPUT"
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mkfs.exfat -c "$MKFS_CLUSTER_ARG" "$OUTPUT"
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mkdir -p /mnt/exfat
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mount -t exfat-fuse -o loop "$OUTPUT" /mnt/exfat
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rsync -r --info=progress2 "$INPUT_DIR"/ /mnt/exfat/
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umount /mnt/exfat
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echo "Created $OUTPUT"
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