mirror of
https://github.com/erenfro/gen2stage4.git
synced 2024-11-13 18:58:57 -05:00
163 lines
3.5 KiB
Bash
Executable file
163 lines
3.5 KiB
Bash
Executable file
#!/usr/bin/env bash
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# get available compression types
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declare -A compressTypes
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compressTypes=(
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["bz2"]="bzip2 pbzip2 lbzip2"
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["gz"]="gzip pigz"
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["lrz"]="lrzip"
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["lz"]="lzip plzip"
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["lz4"]="lz4"
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["lzo"]="lzop"
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["xz"]="xz pixz"
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["zst"]="zstd"
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)
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declare -A compressAvail
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for ext in "${!compressTypes[@]}"; do
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for exechk in ${compressTypes[${ext}]}; do
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binchk=$(command -v "${exechk}")
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if [[ -n "$binchk" ]]; then
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compressAvail+=(["${ext}"]="$binchk")
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fi
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done
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done
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# set flag variables to null/default
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optQuiet=false
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function showHelp() {
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echo "Usage:"
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echo "$(basename "$0") [-q ] [-s || -t <target>] <archivename> [-- [additional-tar-options]]"
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echo
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echo "-q activates quiet mode (no confirmation)"
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echo "-s extracts archive in current directory"
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echo "-t <path> extracts archive in target <path>"
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echo "-h display this help message."
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if [[ "$1" -ge 0 ]]; then
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exit "$1"
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else
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exit 0
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fi
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}
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function errorMsg() {
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local rc=0
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if [[ "$1" -gt 0 ]]; then
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rc="$1"
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shift
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fi
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echo "$*" >&2
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if [[ "$rc" -gt 0 ]]; then
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exit "$rc"
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fi
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}
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# reads options:
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tarArgs=()
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while [[ $# -gt 0 ]]; do
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while getopts ":t:sqh" flag; do
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case "$flag" in
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t) targetPath="$OPTARG";;
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s) targetPath="$(pwd)";;
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q) optQuiet=true;;
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h) showHelp 0;;
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\?) errorMsg 1 "Invalid option: -$OPTARG";;
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:) errorMsg 1 "Option -$OPTARG requires an argument.";;
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esac
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done || exit 1
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[[ $OPTIND -gt $# ]] && break # reached the end of parameters
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shift $((OPTIND - 1)) # Free processed options so far
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OPTIND=1 # we must reset OPTIND
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if [[ -z "$archiveFile" ]]; then
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archiveFile=$1
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else
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tarArgs[${#tarArgs[*]}]=$1
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fi
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shift # remove saved arg
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done
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# checks if run as root:
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if [[ "$(id -u)" -ne 0 ]]; then
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echo "$(basename "$0"): must run as root"
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exit 250
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fi
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if [[ ! -r "$archiveFile" ]]; then
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echo "ERROR: archive file (\`$archiveFile\`) does not exist"
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exit 1
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fi
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archiveExt="${archiveFile##*.}"
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if [[ "${archiveFile%%."$archiveExt"}" != *.tar ]]; then
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echo "The stage file you are trying to unpack (\`$archiveFile\`) does not appear to be an archived TAR file"
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echo "${archiveFile%%."$archiveExt"}"
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exit 1
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fi
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if [[ -n "$targetPath" ]]; then
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if [[ ! -d "$targetPath" ]]; then
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echo "$(basename "$0"): target path '$targetPath' does not exist"
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exit 1
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fi
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# make sure targetPath path ends with slash
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if [[ "$targetPath" != */ ]]; then
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targetPath="${targetPath}/"
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fi
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else
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echo "ERROR: Neither -s or -t <path> provided"
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exit 2
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fi
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# Check if specified type is available
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if [[ -z "${compressAvail[$archiveExt]}" ]]; then
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echo "$(basename "$0"): specified archive compression type not supported."
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echo "Supported: ${compressAvail[*]}"
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exit 1
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fi
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compressOptions=("${compressAvail[$archiveExt]}")
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case "$archiveExt" in
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xz) compressOptions+=("-T0");;
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zst) compressOptions+=("-T0");;
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esac
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tarOptions=(
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"-x"
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"--xattrs-include=*.*"
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"--numeric-owner"
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"--use-compress-prog=${compressOptions[*]}"
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)
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tarOptions+=("${tarArgs[@]}")
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# if not in optQuiet mode, this message will be displayed:
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if ! $optQuiet; then
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echo "Are you sure that you want to extract a stage archive to the system"
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echo "to the destination path?"
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echo "$targetPath"
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echo
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echo "COMMAND LINE PREVIEW:"
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echo 'tar' "${tarOptions[@]}" -f "$archiveFile" -C "$targetPath"
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echo
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echo -n 'Type "yes" to continue or anything else to quit: '
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read -r promptAgree
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if [[ "${promptAgree,,}" == "yes" ]]; then
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optQuiet=true
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fi
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fi
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# start stage4 creation:
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if $optQuiet; then
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tar "${tarOptions[@]}" -f "$archiveFile" -C "$targetPath"
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fi
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