51 lines
1.2 KiB
Text
51 lines
1.2 KiB
Text
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#!/usr/bin/env bash
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usage() {
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# shellcheck disable=SC2016
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echo 'encrypted-dir-archive <dir>
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This script streams an gpg-encrypted byte-stream of a zstd-compressed \
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tarball this can be redirected to a file for an encrypted backup.
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Very roughly, this is a small wrapper around `tar cf . | zstd | gpg --encrypt` \
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so you can go backwards to reverse the process `gpg --decrypt | zstd -d | tar xf`.
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You can stream over ssh as a remote backup by piping to something like this: \
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`ssh "$HOST" "cat - > '\$REMOTE_FILE'"`'.
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}
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if [ "$1" = '-h' ] || [ "$1" = "--help" ]; then
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usage
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exit 0
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fi
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dir="$1"
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if [ -z "$dir" ]; then
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echo "no directory argument provided" >&2
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usage
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exit 1
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fi
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if [ ! -d "$dir" ]; then
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echo "'$dir' is not a directory" >&2
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usage
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exit 2
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fi
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# go to directory containing target directory
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parent="$(dirname "$dir")"
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pushd "$parent" >/dev/null || { echo "failed to cd to '$parent'" >&2; exit 3; }
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# https://stackoverflow.com/a/30520299
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if [ -t 1 ]; then
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echo "not dumping encrypted data to terminal"
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exit 4
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fi
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tar cf - "$(basename "$dir")" \
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| zstd --ultra -T2 -22 \
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| gpg --encrypt --recipient daniel@lyte.dev
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popd || echo "failed to return to original directory" >&2
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