merge_sysroot.sh

#!/bin/bash
# merge-sdk.sh
# Merges extracted SDK with existing crosstool-ng sysroot

set -e

# Configuration
CROSSTOOL_SYSROOT="/path/to/your/crosstool/sysroot"  # Change this
EXTRACTED_SDK="./sysroot"
BACKUP_DIR="./sysroot_backup_$(date +%Y%m%d_%H%M%S)"

# Verify paths
if [ ! -d "$CROSSTOOL_SYSROOT" ]; then
    echo "Error: Crosstool sysroot directory not found: $CROSSTOOL_SYSROOT"
    exit 1
fi

if [ ! -d "$EXTRACTED_SDK" ]; then
    echo "Error: Extracted SDK directory not found: $EXTRACTED_SDK"
    exit 1
fi

# Create backup of crosstool sysroot
echo "Creating backup of crosstool sysroot..."
cp -a "$CROSSTOOL_SYSROOT" "$BACKUP_DIR"

# Function to merge directories
merge_directory() {
    local src="$1"
    local dst="$2"
    local dir="$3"
    
    if [ -d "${src}${dir}" ]; then
        mkdir -p "${dst}${dir}"
        # Copy with dereferencing symlinks (-L) and preserve attributes (-p)
        cp -a -L "${src}${dir}"/* "${dst}${dir}/" 2>/dev/null || true
    fi
}

echo "Merging SDK into crosstool sysroot..."

# Merge key directories
merge_directory "$EXTRACTED_SDK" "$CROSSTOOL_SYSROOT" "/usr/include"
merge_directory "$EXTRACTED_SDK" "$CROSSTOOL_SYSROOT" "/usr/lib"
merge_directory "$EXTRACTED_SDK" "$CROSSTOOL_SYSROOT" "/usr/lib/pkgconfig"
merge_directory "$EXTRACTED_SDK" "$CROSSTOOL_SYSROOT" "/usr/share/pkgconfig"

# Fix pkg-config files
echo "Updating pkg-config files..."
find "$CROSSTOOL_SYSROOT" -name '*.pc' -type f -exec sed -i "s|^prefix=.*|prefix=${CROSSTOOL_SYSROOT}/usr|" {} \;

# Fix symlinks
echo "Fixing symlinks..."
find "$CROSSTOOL_SYSROOT" -type l | while read -r link; do
    target=$(readlink "$link")
    if [[ "$target" == /* ]]; then
        # Convert absolute symlinks to relative
        rel_target=$(realpath --relative-to="$(dirname "$link")" "${CROSSTOOL_SYSROOT}${target}")
        ln -sf "$rel_target" "$link"
    fi
done

echo "Merge complete."
echo "Backup of original sysroot saved in: $BACKUP_DIR"
echo "Remember to check pkg-config and library paths in your build configuration."