bash script to extract compressed super.img's

extract_super.sh

#!/bin/bash
set -e

XZ="meta-quest_eureka_userdebug_v71_super.img.xz"
SUPER="super.img"
TMP="temp_partitions"
OUT="extracted_fs_userdebug"

[ ! -f $SUPER ] && xz -dkc "$XZ" > $SUPER
mkdir -p "$TMP" "$OUT"

# unsparse super.img
simg2img $SUPER $SUPER.raw 2>/dev/null || cp $SUPER $SUPER.raw
# unpack the raw super image into temp dir
lpunpack $SUPER.raw "$TMP" && rm $SUPER.raw

# sort images to ensure 'system' is processed first as 'system' is the root
IMG_LIST=$(ls $TMP/*_a.img | grep "system_a.img")
IMG_LIST="$IMG_LIST $(ls $TMP/*_a.img | grep -v "system_a.img")"

for img in $IMG_LIST; do
    name=$(basename "$img" _a.img)
    # system maps to root, others map to their respective subdirectories
    if [ "$name" == "system" ]; then
        dest="$OUT"
    else
        dest="$OUT/$name"
        # wipe existing mount point to ensure clean extraction
        rm -rf "$dest" && mkdir -p "$dest"
    fi

    # attempt to unsparse all partition images
    simg2img "$img" "$img.raw" 2>/dev/null && mv "$img.raw" "$img"
    # try debugfs (for things such as 'system_ext'), fallback to 7z for everything else
    debugfs -R "rdump / \"$dest\"" "$img" 2>/dev/null || 7z x "$img" -o"$dest" -aoa >/dev/null
done
rm -rf "$TMP"