Added basic archiving script

modules/archive.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+archive_dir="$(dirname "$0")/../archives"
+
+input_file="${1}"
+archive_pwd="${2}"
+size="$3"
+
+check_dependencies() {
+	if ! mkdir -p "$archive_dir"; then
+		echo "ERROR: Unable to create archive directory"
+		exit 1
+	fi
+
+	if ! command -v 7z 2>&1 >/dev/null; then
+		echo "ERROR: 7z must be installed"
+		exit 1
+	fi
+}
+
+check_input() {
+	if [[ ! -e "${input_file}" ]]; then
+		echo "ERROR: Input file '${input_file}' does not exist"
+		exit 2
+	fi
+
+	echo "Archiving file/directory '${input_file}'" >&2
+}
+
+set_volumes() {
+	volumes=
+
+	if [[ "$size" =~ ^[1-9][0-9]*$ ]]; then
+		volumes="-v${size}m"
+	elif [[ -n "$size" ]]; then
+		echo "Invalid size $size, must be a number"
+		exit 2
+	fi
+
+	echo "Volumes set to '$volumes'" >&2
+}
+
+generate_name() {
+	archive="$archive_dir/$(base64 /dev/urandom | tr -dc [:alnum:] | head -c 20).7z"
+
+	echo "Generated archive name $archive" >&2
+}
+
+create_archive() {
+	echo "Packing ${input_file} into archive $archive with password ${archive_pwd}"
+	[[ -n "$volumes" ]] && echo "and volumes of size $size MB"
+
+	7z a -mhe=on "-p${archive_pwd}" "$volumes" "$archive" "${input_file}" >&2
+}
+
+check_dependencies
+check_input
+set_volumes
+generate_name
+create_archive