265 lines
6.5 KiB
Text
265 lines
6.5 KiB
Text
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#!/usr/bin/env bash
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# Purpose: plain text tar format
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# Limitations: - only suitable for text files, directories, and symlinks
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# - stores only filename, content, and mode
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# - not designed for untrusted input
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# Note: must work with bash version 3.2 (macOS)
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set -o errexit -o nounset
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# Sanitize environment (for instance, standard sorting of glob matches)
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export LC_ALL=C
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path=""
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CMD=""
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function usage {
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bname=$(basename "$0")
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cat << USAGE
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Usage: $bname [-C <DIR>] -c -f <ARCHIVE> <FILE...> (create archive)
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$bname -t -f <ARCHIVE> (list archive contents)
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$bname [-C <DIR>] -x -f <ARCHIVE> (extract archive)
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Options:
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-C <DIR> (change directory)
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Example: Change to sysfs directory, create ttar file from fixtures directory
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$bname -C sysfs -c -f sysfs/fixtures.ttar fixtures/
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USAGE
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exit "$1"
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}
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function vecho {
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if [ "${VERBOSE:-}" == "yes" ]; then
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echo >&7 "$@"
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fi
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}
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function set_cmd {
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if [ -n "$CMD" ]; then
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echo "ERROR: more than one command given"
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echo
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usage 2
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fi
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CMD=$1
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}
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while getopts :cf:htxvC: opt; do
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case $opt in
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c)
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set_cmd "create"
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;;
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f)
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ARCHIVE=$OPTARG
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;;
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h)
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usage 0
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;;
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t)
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set_cmd "list"
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;;
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x)
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set_cmd "extract"
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;;
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v)
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VERBOSE=yes
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exec 7>&1
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;;
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C)
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CDIR=$OPTARG
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;;
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*)
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echo >&2 "ERROR: invalid option -$OPTARG"
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echo
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usage 1
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;;
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esac
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done
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# Remove processed options from arguments
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shift $(( OPTIND - 1 ));
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if [ "${CMD:-}" == "" ]; then
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echo >&2 "ERROR: no command given"
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echo
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usage 1
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elif [ "${ARCHIVE:-}" == "" ]; then
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echo >&2 "ERROR: no archive name given"
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echo
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usage 1
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fi
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function list {
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local path=""
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local size=0
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local line_no=0
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local ttar_file=$1
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if [ -n "${2:-}" ]; then
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echo >&2 "ERROR: too many arguments."
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echo
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usage 1
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fi
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if [ ! -e "$ttar_file" ]; then
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echo >&2 "ERROR: file not found ($ttar_file)"
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echo
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usage 1
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fi
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while read -r line; do
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line_no=$(( line_no + 1 ))
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if [ $size -gt 0 ]; then
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size=$(( size - 1 ))
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continue
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fi
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if [[ $line =~ ^Path:\ (.*)$ ]]; then
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path=${BASH_REMATCH[1]}
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elif [[ $line =~ ^Lines:\ (.*)$ ]]; then
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size=${BASH_REMATCH[1]}
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echo "$path"
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elif [[ $line =~ ^Directory:\ (.*)$ ]]; then
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path=${BASH_REMATCH[1]}
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echo "$path/"
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elif [[ $line =~ ^SymlinkTo:\ (.*)$ ]]; then
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echo "$path -> ${BASH_REMATCH[1]}"
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fi
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done < "$ttar_file"
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}
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function extract {
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local path=""
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local size=0
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local line_no=0
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local ttar_file=$1
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if [ -n "${2:-}" ]; then
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echo >&2 "ERROR: too many arguments."
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echo
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usage 1
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fi
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if [ ! -e "$ttar_file" ]; then
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echo >&2 "ERROR: file not found ($ttar_file)"
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echo
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usage 1
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fi
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while IFS= read -r line; do
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line_no=$(( line_no + 1 ))
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if [ "$size" -gt 0 ]; then
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echo "$line" >> "$path"
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size=$(( size - 1 ))
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continue
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fi
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if [[ $line =~ ^Path:\ (.*)$ ]]; then
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path=${BASH_REMATCH[1]}
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if [ -e "$path" ] || [ -L "$path" ]; then
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rm "$path"
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fi
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elif [[ $line =~ ^Lines:\ (.*)$ ]]; then
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size=${BASH_REMATCH[1]}
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# Create file even if it is zero-length.
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touch "$path"
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vecho " $path"
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elif [[ $line =~ ^Mode:\ (.*)$ ]]; then
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mode=${BASH_REMATCH[1]}
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chmod "$mode" "$path"
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vecho "$mode"
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elif [[ $line =~ ^Directory:\ (.*)$ ]]; then
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path=${BASH_REMATCH[1]}
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mkdir -p "$path"
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vecho " $path/"
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elif [[ $line =~ ^SymlinkTo:\ (.*)$ ]]; then
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ln -s "${BASH_REMATCH[1]}" "$path"
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vecho " $path -> ${BASH_REMATCH[1]}"
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elif [[ $line =~ ^# ]]; then
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# Ignore comments between files
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continue
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else
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echo >&2 "ERROR: Unknown keyword on line $line_no: $line"
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exit 1
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fi
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done < "$ttar_file"
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}
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function div {
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echo "# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -" \
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"- - - - - -"
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}
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function get_mode {
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local mfile=$1
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if [ -z "${STAT_OPTION:-}" ]; then
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if stat -c '%a' "$mfile" >/dev/null 2>&1; then
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STAT_OPTION='-c'
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STAT_FORMAT='%a'
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else
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STAT_OPTION='-f'
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STAT_FORMAT='%A'
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fi
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fi
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stat "${STAT_OPTION}" "${STAT_FORMAT}" "$mfile"
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}
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function _create {
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shopt -s nullglob
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local mode
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while (( "$#" )); do
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file=$1
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if [ -L "$file" ]; then
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echo "Path: $file"
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symlinkTo=$(readlink "$file")
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echo "SymlinkTo: $symlinkTo"
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vecho " $file -> $symlinkTo"
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div
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elif [ -d "$file" ]; then
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# Strip trailing slash (if there is one)
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file=${file%/}
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echo "Directory: $file"
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mode=$(get_mode "$file")
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echo "Mode: $mode"
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vecho "$mode $file/"
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div
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# Find all files and dirs, including hidden/dot files
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for x in "$file/"{*,.[^.]*}; do
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_create "$x"
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done
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elif [ -f "$file" ]; then
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echo "Path: $file"
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lines=$(wc -l "$file"|awk '{print $1}')
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echo "Lines: $lines"
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cat "$file"
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mode=$(get_mode "$file")
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echo "Mode: $mode"
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vecho "$mode $file"
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div
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else
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echo >&2 "ERROR: file not found ($file in $(pwd))"
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exit 2
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fi
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shift
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done
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}
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function create {
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ttar_file=$1
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shift
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if [ -z "${1:-}" ]; then
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echo >&2 "ERROR: missing arguments."
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echo
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usage 1
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fi
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if [ -e "$ttar_file" ]; then
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rm "$ttar_file"
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fi
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exec > "$ttar_file"
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_create "$@"
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}
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if [ -n "${CDIR:-}" ]; then
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if [[ "$ARCHIVE" != /* ]]; then
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# Relative path: preserve the archive's location before changing
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# directory
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ARCHIVE="$(pwd)/$ARCHIVE"
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fi
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cd "$CDIR"
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fi
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"$CMD" "$ARCHIVE" "$@"
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