parse_xiaomi_fingerprint.sh

#!/bin/bash

if [[ -z "$1" ]]; then
    echo "Usage: $0 <rom_root_directory>"
    exit 1
fi

ROM_DIR="$(cd "$1" 2>/dev/null && pwd)"
if [[ -z "$ROM_DIR" ]]; then
    echo "Error: invalid directory: $1"
    exit 1
fi

ODM_PROP="${ROM_DIR}/odm/etc/build.prop"
SYSTEM_PROP_PRIMARY="${ROM_DIR}/system/build.prop"
SYSTEM_PROP_FALLBACK="${ROM_DIR}/system/system/build.prop"

missing=0

# helper: read property value from build.prop
getprop_from_file() {
    local key="$1"
    local file="$2"
    [[ -f "$file" ]] || return
    grep -m1 "^${key}=" "$file" | cut -d= -f2-
}

# helper: try system primary, then fallback
get_system_prop() {
    local key="$1"
    local val

    val=$(getprop_from_file "$key" "$SYSTEM_PROP_PRIMARY")
    [[ -n "$val" ]] && echo "$val" && return

    getprop_from_file "$key" "$SYSTEM_PROP_FALLBACK"
}

check_prop() {
    local value="$1"
    local key="$2"
    local file="$3"

    if [[ -z "$value" ]]; then
        echo "Missing property: ${key} (from ${file})"
        missing=1
    fi
}

# ---- ODM properties ----
ODM_BRAND=$(getprop_from_file ro.product.odm.brand "$ODM_PROP")
ODM_NAME=$(getprop_from_file ro.product.odm.name "$ODM_PROP")
ODM_DEVICE=$(getprop_from_file ro.product.odm.device "$ODM_PROP")

check_prop "$ODM_BRAND"  "ro.product.odm.brand"  "$ODM_PROP"
check_prop "$ODM_NAME"   "ro.product.odm.name"   "$ODM_PROP"
check_prop "$ODM_DEVICE" "ro.product.odm.device" "$ODM_PROP"

# ---- SYSTEM properties (with fallback) ----
ANDROID_RELEASE=$(get_system_prop ro.system.build.version.release)
BUILD_ID=$(get_system_prop ro.system.build.id)
INCREMENTAL=$(get_system_prop ro.system.build.version.incremental)
BUILD_TYPE=$(get_system_prop ro.build.type)
BUILD_TAGS=$(get_system_prop ro.build.tags)

check_prop "$ANDROID_RELEASE" "ro.system.build.version.release" \
    "${SYSTEM_PROP_PRIMARY} or ${SYSTEM_PROP_FALLBACK}"
check_prop "$BUILD_ID" "ro.system.build.id" \
    "${SYSTEM_PROP_PRIMARY} or ${SYSTEM_PROP_FALLBACK}"
check_prop "$INCREMENTAL" "ro.system.build.version.incremental" \
    "${SYSTEM_PROP_PRIMARY} or ${SYSTEM_PROP_FALLBACK}"
check_prop "$BUILD_TYPE" "ro.build.type" \
    "${SYSTEM_PROP_PRIMARY} or ${SYSTEM_PROP_FALLBACK}"
check_prop "$BUILD_TAGS" "ro.build.tags" \
    "${SYSTEM_PROP_PRIMARY} or ${SYSTEM_PROP_FALLBACK}"

# stop if anything missing
if [[ $missing -eq 1 ]]; then
    echo "Aborting: one or more required properties are missing."
    exit 1
fi

# assemble fingerprint
FINGERPRINT="${ODM_BRAND}/${ODM_NAME}/${ODM_DEVICE}:${ANDROID_RELEASE}/${BUILD_ID}/${INCREMENTAL}:${BUILD_TYPE}/${BUILD_TAGS}"

echo "$FINGERPRINT"