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1 file changed, 147 insertions
relativize_symlinks.sh(file created)
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| 1 | + | #!/bin/bash | |
| 2 | + | ||
| 3 | + | # Script to convert absolute symlinks to relative symlinks in a directory | |
| 4 | + | # Usage: ./relativize_symlinks.sh [directory] | |
| 5 | + | ||
| 6 | + | set -e | |
| 7 | + | ||
| 8 | + | # Function to calculate relative path from source to target | |
| 9 | + | calculate_relative_path() { | |
| 10 | + | local source="$1" | |
| 11 | + | local target="$2" | |
| 12 | + | ||
| 13 | + | # Convert to absolute paths to ensure consistency | |
| 14 | + | source=$(realpath -m "$source") | |
| 15 | + | target=$(realpath -m "$target") | |
| 16 | + | ||
| 17 | + | # Split paths into arrays | |
| 18 | + | IFS='/' read -ra source_parts <<< "${source#/}" | |
| 19 | + | IFS='/' read -ra target_parts <<< "${target#/}" | |
| 20 | + | ||
| 21 | + | # Find common prefix length | |
| 22 | + | local common_length=0 | |
| 23 | + | local min_length=$((${#source_parts[@]} < ${#target_parts[@]} ? ${#source_parts[@]} : ${#target_parts[@]})) | |
| 24 | + | ||
| 25 | + | for ((i=0; i<min_length; i++)); do | |
| 26 | + | if [[ "${source_parts[i]}" == "${target_parts[i]}" ]]; then | |
| 27 | + | ((common_length++)) | |
| 28 | + | else | |
| 29 | + | break | |
| 30 | + | fi | |
| 31 | + | done | |
| 32 | + | ||
| 33 | + | # Calculate number of directories to go up from source | |
| 34 | + | local up_dirs=$((${#source_parts[@]} - common_length - 1)) | |
| 35 | + | ||
| 36 | + | # Build relative path | |
| 37 | + | local relative_path="" | |
| 38 | + | ||
| 39 | + | # Add ../ for each directory we need to go up | |
| 40 | + | for ((i=0; i<up_dirs; i++)); do | |
| 41 | + | if [[ -n "$relative_path" ]]; then | |
| 42 | + | relative_path="${relative_path}/.." | |
| 43 | + | else | |
| 44 | + | relative_path=".." | |
| 45 | + | fi | |
| 46 | + | done | |
| 47 | + | ||
| 48 | + | # Add the remaining target path components | |
| 49 | + | for ((i=common_length; i<${#target_parts[@]}; i++)); do | |
| 50 | + | if [[ -n "$relative_path" ]]; then | |
| 51 | + | relative_path="${relative_path}/${target_parts[i]}" | |
| 52 | + | else | |
| 53 | + | relative_path="${target_parts[i]}" | |
| 54 | + | fi | |
| 55 | + | done | |
| 56 | + | ||
| 57 | + | # Handle case where source and target are the same | |
| 58 | + | if [[ -z "$relative_path" ]]; then | |
| 59 | + | relative_path="." | |
| 60 | + | fi | |
| 61 | + | ||
| 62 | + | echo "$relative_path" | |
| 63 | + | } | |
| 64 | + | ||
| 65 | + | # Function to process symlinks in a directory | |
| 66 | + | process_directory() { | |
| 67 | + | local dir="$1" | |
| 68 | + | local base_dir="$2" | |
| 69 | + | ||
| 70 | + | echo "Processing directory: $dir" | |
| 71 | + | ||
| 72 | + | # Find all symbolic links in the directory | |
| 73 | + | while IFS= read -r -d '' symlink; do | |
| 74 | + | # Get the target of the symlink | |
| 75 | + | local target | |
| 76 | + | target=$(readlink "$symlink") | |
| 77 | + | ||
| 78 | + | # Check if it's an absolute path | |
| 79 | + | if [[ "$target" == /* ]]; then | |
| 80 | + | echo "Found absolute symlink: $symlink -> $target" | |
| 81 | + | ||
| 82 | + | # Calculate the directory containing the symlink | |
| 83 | + | local symlink_dir | |
| 84 | + | symlink_dir=$(dirname "$symlink") | |
| 85 | + | ||
| 86 | + | # Convert absolute target to be relative to base directory | |
| 87 | + | local adjusted_target="${base_dir}${target}" | |
| 88 | + | ||
| 89 | + | # Calculate relative path from symlink location to target | |
| 90 | + | local relative_target | |
| 91 | + | relative_target=$(calculate_relative_path "$symlink_dir/dummy" "$adjusted_target") | |
| 92 | + | ||
| 93 | + | echo " Converting to: $symlink -> $relative_target" | |
| 94 | + | ||
| 95 | + | # Remove the old symlink and create the new relative one | |
| 96 | + | rm "$symlink" | |
| 97 | + | ln -s "$relative_target" "$symlink" | |
| 98 | + | ||
| 99 | + | echo " ✓ Converted successfully" | |
| 100 | + | fi | |
| 101 | + | done < <(find "$dir" -type l -print0) | |
| 102 | + | } | |
| 103 | + | ||
| 104 | + | # Main script | |
| 105 | + | main() { | |
| 106 | + | local target_dir="${1:-.}" | |
| 107 | + | ||
| 108 | + | # Validate directory exists | |
| 109 | + | if [[ ! -d "$target_dir" ]]; then | |
| 110 | + | echo "Error: Directory '$target_dir' does not exist" >&2 | |
| 111 | + | exit 1 | |
| 112 | + | fi | |
| 113 | + | ||
| 114 | + | # Get absolute path of target directory to use as base | |
| 115 | + | local abs_target_dir | |
| 116 | + | abs_target_dir=$(realpath "$target_dir") | |
| 117 | + | ||
| 118 | + | echo "Relativizing symlinks in: $abs_target_dir" | |
| 119 | + | echo "Using current directory as filesystem root" | |
| 120 | + | echo | |
| 121 | + | ||
| 122 | + | # Process the directory | |
| 123 | + | process_directory "$target_dir" "$abs_target_dir" | |
| 124 | + | ||
| 125 | + | echo | |
| 126 | + | echo "Symlink relativization complete!" | |
| 127 | + | } | |
| 128 | + | ||
| 129 | + | # Show usage if --help is passed | |
| 130 | + | if [[ "$1" == "--help" || "$1" == "-h" ]]; then | |
| 131 | + | echo "Usage: $0 [directory]" | |
| 132 | + | echo | |
| 133 | + | echo "Convert absolute symlinks to relative symlinks in the specified directory." | |
| 134 | + | echo "If no directory is specified, the current directory is used." | |
| 135 | + | echo | |
| 136 | + | echo "Example:" | |
| 137 | + | echo " $0 ./extracted_filesystem" | |
| 138 | + | echo | |
| 139 | + | echo "This will convert symlinks like:" | |
| 140 | + | echo " usr/lib/libz.so -> /lib/libz.so.1.2.11" | |
| 141 | + | echo "To:" | |
| 142 | + | echo " usr/lib/libz.so -> ../../lib/libz.so.1.2.11" | |
| 143 | + | exit 0 | |
| 144 | + | fi | |
| 145 | + | ||
| 146 | + | # Run main function | |
| 147 | + | main "$@" | |
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