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auto-shrink-compress-img.sh
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auto-shrink-compress-img.sh
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#!/bin/bash
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set -e
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SECTOR_SIZE=512
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PADDING_MB=4
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IMAGE=""
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RESIZED_IMAGE=""
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COMPRESSED_NAME=""
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echo "==== 🔍 Smart SD Image Shrinker ===="
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# === Step 1: Find .img files ===
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mapfile -t IMAGES < <(find . -maxdepth 1 -type f -name "*.img" | sort)
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if [ ${#IMAGES[@]} -eq 0 ]; then
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echo "❌ No .img files found in the current directory."
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exit 1
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fi
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echo ""
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echo "📂 Found the following .img files:"
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for i in "${!IMAGES[@]}"; do
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printf " [%d] %s\n" "$((i+1))" "${IMAGES[$i]}"
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done
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echo ""
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read -p "👉 Enter the number of the image you want to shrink: " SELECTION
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if ! [[ "$SELECTION" =~ ^[0-9]+$ ]] || [ "$SELECTION" -lt 1 ] || [ "$SELECTION" -gt "${#IMAGES[@]}" ]; then
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echo "❌ Invalid selection."
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exit 1
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fi
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IMAGE="${IMAGES[$((SELECTION-1))]}"
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BASENAME=$(basename "$IMAGE")
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echo "✅ Selected: $IMAGE"
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echo ""
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# === Step 2: Select auto or manual sizing ===
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echo "📏 Choose target size mode:"
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echo " [1] Auto-select smallest SD card (adds 2GB headroom)"
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echo " [2] Choose target SD card size manually"
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read -p "👉 Enter your choice [1-2]: " SIZE_MODE
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if [[ "$SIZE_MODE" != "1" && "$SIZE_MODE" != "2" ]]; then
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echo "❌ Invalid selection."
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exit 1
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fi
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# === Step 3: Auto-fix GPT if needed ===
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echo "[*] Pre-checking GPT for leftover space issues..."
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echo -e "w\ny\n" | sudo gdisk "$IMAGE" >/dev/null 2>&1 || true
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# === Step 4: Attach image to loop device ===
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echo "📌 Attaching image to loop device..."
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LOOP_DEV=$(sudo losetup --show -Pf "$IMAGE")
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# === Step 5: Detect rootfs ===
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PARTS=$(lsblk -nrpo NAME "$LOOP_DEV" | grep -E "$LOOP_DEV"p)
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ROOT_PART=$(for P in $PARTS; do lsblk -bno SIZE "$P" | awk -v p="$P" '{print $1, p}'; done | sort -nr | head -n1 | awk '{print $2}')
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if [ -z "$ROOT_PART" ]; then
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echo "❌ Error: Couldn't detect root partition."
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sudo losetup -d "$LOOP_DEV"
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exit 1
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fi
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PART_NUM=$(basename "$ROOT_PART" | grep -o '[0-9]*$')
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echo "🔍 Detected rootfs: $ROOT_PART (Partition #$PART_NUM)"
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# === Step 6: Unmount if mounted ===
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sudo umount "$ROOT_PART" 2>/dev/null || true
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# === Step 7: Determine used space + headroom ===
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USED_MB=$(sudo df -m "$ROOT_PART" | awk 'NR==2 {print $3}')
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REQUIRED_MB=$(( USED_MB + 2048 ))
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# === Define known SD card sizes (actual usable MB) ===
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declare -A SD_SIZES
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SD_SIZES=(
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["8GB"]=6900
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["16GB"]=13500
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["32GB"]=29000
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["64GB"]=59000
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["128GB"]=119000
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)
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# === Determine final TARGET_SIZE_MB ===
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if [ "$SIZE_MODE" == "1" ]; then
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echo "🧠 Auto-selecting smallest SD card size to fit $REQUIRED_MB MB..."
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for label in 8GB 16GB 32GB 64GB 128GB; do
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if [ "$REQUIRED_MB" -le "${SD_SIZES[$label]}" ]; then
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TARGET_SIZE_MB=${SD_SIZES[$label]}
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SIZE_LABEL=$label
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echo "✅ Selected size: $SIZE_LABEL (${TARGET_SIZE_MB} MB)"
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break
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fi
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done
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if [ -z "$SIZE_LABEL" ]; then
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echo "❌ No supported SD size large enough. Required: $REQUIRED_MB MB"
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sudo losetup -d "$LOOP_DEV"
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exit 1
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fi
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else
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echo ""
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echo "📐 Choose target SD card size:"
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OPTIONS=("8GB" "16GB" "32GB" "64GB" "128GB")
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for i in "${!OPTIONS[@]}"; do
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printf " [%d] %s\n" "$((i+1))" "${OPTIONS[$i]}"
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done
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read -p "👉 Enter your choice [1-5]: " SIZE_CHOICE
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if ! [[ "$SIZE_CHOICE" =~ ^[1-5]$ ]]; then
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echo "❌ Invalid selection."
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sudo losetup -d "$LOOP_DEV"
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exit 1
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fi
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SIZE_LABEL=${OPTIONS[$((SIZE_CHOICE-1))]}
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TARGET_SIZE_MB=${SD_SIZES[$SIZE_LABEL]}
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if [ "$REQUIRED_MB" -gt "$TARGET_SIZE_MB" ]; then
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echo "⚠️ $SIZE_LABEL is too small to hold this data (need $REQUIRED_MB MB)"
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echo "🔁 Auto-selecting next size up..."
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FOUND=0
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for label in 16GB 32GB 64GB 128GB; do
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if [ "$REQUIRED_MB" -le "${SD_SIZES[$label]}" ]; then
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TARGET_SIZE_MB=${SD_SIZES[$label]}
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SIZE_LABEL=$label
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echo "✅ Switched to: $SIZE_LABEL (${TARGET_SIZE_MB} MB)"
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FOUND=1
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break
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fi
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done
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if [ "$FOUND" -eq 0 ]; then
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echo "❌ No SD size large enough. Required: $REQUIRED_MB MB"
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sudo losetup -d "$LOOP_DEV"
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exit 1
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fi
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else
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echo "✅ Selected target: $SIZE_LABEL (${TARGET_SIZE_MB} MB)"
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fi
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fi
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# === Step 8: fsck and resize ===
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echo "🔧 Running fsck and shrinking rootfs..."
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sudo e2fsck -fy "$ROOT_PART" | tee fsck.log
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if grep -q "FILE SYSTEM WAS MODIFIED" fsck.log; then
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echo "🔁 FS was modified. Re-checking..."
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sudo e2fsck -fy "$ROOT_PART"
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fi
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rm -f fsck.log
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sudo resize2fs "$ROOT_PART" "${TARGET_SIZE_MB}M"
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# === Step 9: Resize partition ===
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START_SECTOR=$(sudo parted -s "$IMAGE" unit s print | grep "^ $PART_NUM" | awk '{print $2}' | sed 's/s//')
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TARGET_SECTORS=$((TARGET_SIZE_MB * 1024 * 1024 / SECTOR_SIZE))
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END_SECTOR=$((START_SECTOR + TARGET_SECTORS - 1))
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PART_TYPE=$(sudo parted -s "$IMAGE" print | grep "Partition Table" | awk '{print $3}')
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echo "🧠 Partition table type: $PART_TYPE"
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if [[ "$PART_TYPE" == "msdos" ]]; then
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echo "🔧 Updating MBR partition..."
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PART_DEV="./${BASENAME}${PART_NUM}"
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echo "🧪 Looking for partition entry named: $PART_DEV"
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echo "📄 sfdisk --dump preview:"
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sudo sfdisk --dump "$IMAGE" | grep "$PART_DEV"
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TEMP_SFDISK="temp-sfdisk-edit.txt"
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echo "📄 Updating partition entry for: $PART_DEV"
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sudo sfdisk --dump "$IMAGE" | awk -v dev="$PART_DEV" -v start="$START_SECTOR" -v end="$END_SECTOR" '
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BEGIN { updated = 0 }
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{
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if ($1 == dev) {
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size = end - start + 1
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print $1 " : start=" start ", size=" size ", type=83"
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updated = 1
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} else {
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print $0
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}
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}
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END {
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if (updated == 0) {
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print "❌ Failed to update partition: entry not found for " dev > "/dev/stderr"
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exit 1
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}
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}' > "$TEMP_SFDISK"
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sudo sfdisk "$IMAGE" < "$TEMP_SFDISK"
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rm -f "$TEMP_SFDISK"
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elif [[ "$PART_TYPE" == "gpt" ]]; then
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echo "🔧 Updating GPT partition..."
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sudo sgdisk --delete=$PART_NUM "$IMAGE"
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sudo sgdisk --new=$PART_NUM:$START_SECTOR:$END_SECTOR "$IMAGE"
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else
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echo "❌ Unknown partition type: $PART_TYPE"
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sudo losetup -d "$LOOP_DEV"
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exit 1
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fi
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# === Step 10: Detach + truncate resized image ===
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sudo losetup -d "$LOOP_DEV"
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TRUNC_SIZE=$(( (END_SECTOR + (PADDING_MB * 1024 * 1024 / SECTOR_SIZE)) * SECTOR_SIZE ))
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RESIZED_IMAGE="resized-${SIZE_LABEL}-${BASENAME}"
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echo "✂️ Creating resized image: $RESIZED_IMAGE"
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dd if="$IMAGE" of="$RESIZED_IMAGE" bs=1M count=$((TRUNC_SIZE / 1024 / 1024)) status=progress
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# === Step 11: Compress ===
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echo "📦 Compressing to .xz..."
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xz -T0 -9 "$RESIZED_IMAGE"
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echo ""
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echo "🔍 Verifying compressed image..."
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if xz -t "${RESIZED_IMAGE}.xz"; then
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echo "✅ Compression verified!"
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else
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echo "❌ Compression failed! The .xz file may be corrupted."
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exit 1
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fi
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echo ""
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echo "✅ Done! Output: ${RESIZED_IMAGE}.xz"
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75
create-image-sdcard-resize-optional.sh
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75
create-image-sdcard-resize-optional.sh
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#!/bin/bash
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set -e
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RESIZE_SCRIPT="./auto-shrink-compress-img.sh"
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echo "==== 🧠 SD Card Disk Imager + Auto Resize ===="
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# === Step 1: Detect likely SD card devices ===
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echo ""
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echo "📦 Scanning for removable storage devices..."
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mapfile -t DISKS < <(lsblk -dpno NAME,MODEL,SIZE,RM | awk '$4 == 1 { print $1 }')
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if [ ${#DISKS[@]} -eq 0 ]; then
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echo "❌ No removable (likely SD card) devices found!"
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exit 1
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fi
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echo ""
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echo "📂 Found the following removable block devices:"
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for i in "${!DISKS[@]}"; do
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disk_info=$(lsblk -dno NAME,MODEL,SIZE "${DISKS[$i]}")
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printf " [%d] %s\n" "$((i+1))" "$disk_info"
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done
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echo ""
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read -p "👉 Enter the number of the disk to back up: " SELECTION
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if ! [[ "$SELECTION" =~ ^[0-9]+$ ]] || [ "$SELECTION" -lt 1 ] || [ "$SELECTION" -gt "${#DISKS[@]}" ]; then
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echo "❌ Invalid selection."
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exit 1
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fi
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DISK="${DISKS[$((SELECTION-1))]}"
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echo "✅ Selected disk: $DISK"
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echo ""
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# === Step 2: Ask for image filename ===
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read -p "💾 Enter a name for the output image file (no extension): " IMG_NAME
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IMG_FILE="${IMG_NAME}.img"
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if [ -f "$IMG_FILE" ]; then
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echo "⚠️ File '$IMG_FILE' already exists! Please choose a different name."
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exit 1
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fi
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echo ""
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echo "📸 Creating disk image from $DISK..."
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sudo dd if="$DISK" of="$IMG_FILE" bs=4M status=progress conv=fsync
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echo ""
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echo "✅ Disk image created: $IMG_FILE"
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# === Step 3: Ask if user wants to auto-shrink ===
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echo ""
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if [ ! -f "$RESIZE_SCRIPT" ]; then
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echo "⚠️ Resize script '$RESIZE_SCRIPT' not found! Skipping auto-shrink."
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exit 0
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fi
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echo "⏳ Would you like to resize & compress this image using:"
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echo " $RESIZE_SCRIPT"
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echo ""
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echo "It will auto-run in 30 seconds if no answer is given."
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read -t 30 -p "Type 'n' to skip or press [Enter] to run: " ANSWER
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if [[ "$ANSWER" =~ ^[Nn]$ ]]; then
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echo "🚫 Skipping resize/compression."
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exit 0
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fi
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# === Step 4: Run the shrink script ===
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echo ""
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echo "🚀 Running auto-shrink script..."
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bash "$RESIZE_SCRIPT"
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