127 lines
4 KiB
Bash
Executable file
127 lines
4 KiB
Bash
Executable file
#!/bin/sh
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set -eu
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XDG_DATA_HOME="${XDG_DATA_HOME:-$HOME/.local/share}"
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XDG_DATA_DIRS="${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
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TARBACK_REMOTE_DEFAULT=
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TARBACK_TRANSFORM_REMOTE_COMMAND_DEFAULT=
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# shellcheck disable=SC2016 # disable variable not expanding hint
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TARBACK_TAR_CREATE_COMMAND_DEFAULT='tar c -C "$(dirname "$1")" "$(basename "$1")"'
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# shellcheck disable=SC2016 # disable variable not expanding hint
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TARBACK_TAR_EXTRACT_COMMAND_DEFAULT='tar x -C "$(dirname "$1")"'
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TARBACK_COMPRESSION_DEFAULT='xz'
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TARBACK_SPLIT_DEFAULT="split -b $((128*1024*1024)) -"
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TARBACK_MERGE_DEFAULT='cat'
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TARBACK_PLUGIN_SEARCH_PATH_DEFAULT="$(dirname "$0"):$XDG_DATA_HOME:$XDG_DATA_DIRS"
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# example: TARBACK_REMOTE="ssh myuser@myserver" ./tarback ...
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TARBACK_REMOTE="${TARBACK_REMOTE:-$TARBACK_REMOTE_DEFAULT}"
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# maybe the command needs to be transformed before being passed to the
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# remote command, see _transform_ssh_command for an example
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TARBACK_TRANSFORM_REMOTE_COMMAND="${TARBACK_TRANSFORM_REMOTE_COMMAND:-$TARBACK_TRANSFORM_REMOTE_COMMAND_DEFAULT}"
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TARBACK_TAR_CREATE_COMMAND="${TARBACK_TAR_CREATE_COMMAND:-$TARBACK_TAR_CREATE_COMMAND_DEFAULT}"
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TARBACK_TAR_EXTRACT_COMMAND="${TARBACK_TAR_EXTRACT_COMMAND:-$TARBACK_TAR_EXTRACT_COMMAND_DEFAULT}"
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TARBACK_COMPRESSION="${TARBACK_COMPRESSION:-$TARBACK_COMPRESSION_DEFAULT}"
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TARBACK_SPLIT="${TARBACK_SPLIT:-$TARBACK_SPLIT_DEFAULT}"
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TARBACK_MERGE="${TARBACK_MERGE:-$TARBACK_MERGE_DEFAULT}"
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TARBACK_PLUGIN_SEARCH_PATH="${TARBACK_PLUGIN_SEARCH_PATH:-$TARBACK_PLUGIN_SEARCH_PATH_DEFAULT}"
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TARBACK_PLUGIN_SEARCH_PATH="$(echo "$TARBACK_PLUGIN_SEARCH_PATH" | tr ':' '\n')"
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_transform_split_name() {
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command_name="$(echo "$TARBACK_SPLIT" | awk '{print $1}')"
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if echo "$command_name" | grep -q 'split'; then
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echo "$1.part"
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else
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echo "$1"
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fi
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}
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_transform_ssh_command() {
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command_name="$(echo "$TARBACK_REMOTE" | awk '{print $1}')"
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if echo "$command_name" | grep -q 'ssh'; then
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echo "'$1'"
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else
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echo "$1"
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fi
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}
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_transform_remote() {
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r="$1"
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# TODO add more transformers
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for t in _transform_ssh_command "$TARBACK_TRANSFORM_REMOTE_COMMAND"; do
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[ -z "$t" ] && continue # skip empty transformers
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r="$("$t" "$r")"
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done
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echo "$r"
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}
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create() {
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# $1 ... src
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# $2 ... dst
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src="$1"
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dst="$(_transform_split_name "$2")"
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tarback_tar_create_command="$(_transform_remote "$TARBACK_TAR_CREATE_COMMAND")"
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$TARBACK_REMOTE sh -c "$tarback_tar_create_command" - "$src" \
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| $TARBACK_COMPRESSION \
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| $TARBACK_SPLIT "$dst"
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}
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restore() {
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src="$(_transform_split_name "$1")"
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dst="$2"
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tarback_tar_extract_command="$(_transform_remote "$TARBACK_TAR_EXTRACT_COMMAND")"
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$TARBACK_MERGE "$src"* \
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| $TARBACK_COMPRESSION --decompress --stdout \
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| $TARBACK_REMOTE sh -c "$tarback_tar_extract_command" - "$dst"
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}
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short_options='p:'
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while getopts "$short_options" arg; do
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case "$arg" in
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p)
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# source plugin file
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sourced=false
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for loc in $TARBACK_PLUGIN_SEARCH_PATH; do
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if [ -e "$loc/tarback/$OPTARG.sh" ]; then
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# shellcheck disable=SC1090 # disable cannot follow source
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. "$loc/tarback/$OPTARG.sh"
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sourced=true
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break
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fi
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done
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if ! "$sourced"; then
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echo "couldn't find plugin $OPTARG" >&2
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exit 1
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fi
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shift 2
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;;
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*)
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echo "unknown option $1" >&2
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exit 1
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;;
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esac
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done
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case "$1" in
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create)
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shift
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if [ "$#" -eq 2 ]; then
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create "$@"
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else
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echo 'not enough arguments, expected 2: src dest' >&2
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exit 1
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fi
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;;
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restore)
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shift
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if [ "$#" -eq 2 ]; then
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restore "$@"
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else
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echo 'not enough arguments, expected 2: src dest' >&2
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exit 1
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fi
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;;
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esac
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