Now prints a more user-friendly error message when installed as a Snap package and permission errors are encountered. Updated the Snap build process as well.

build_snap.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+
+#
+#   The MIT License (MIT)
+#
+#   Copyright (C) 2021 Joe Testa (jtesta@positronsecurity.com)
+#
+#   Permission is hereby granted, free of charge, to any person obtaining a copy
+#   of this software and associated documentation files (the "Software"), to deal
+#   in the Software without restriction, including without limitation the rights
+#   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+#   copies of the Software, and to permit persons to whom the Software is
+#   furnished to do so, subject to the following conditions:
+#
+#   The above copyright notice and this permission notice shall be included in
+#   all copies or substantial portions of the Software.
+#
+#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+#   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+#   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+#   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+#   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+#   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+#   THE SOFTWARE.
+#
+
+################################################################################
+# build_snap.sh
+#
+# Builds a Snap package.
+################################################################################
+
+
+# Pre-requisites
+sudo apt install -y make snapcraft
+sudo snap install review-tools lxd 2> /dev/null
+
+# Initialize LXD.
+sudo lxd init --auto
+
+# Reset the filesystem from any previous runs.
+rm -rf parts/ prime/ snap/ stage/ build/ dist/ src/*.egg-info/ ssh-audit*.snap
+git checkout snapcraft.yaml 2> /dev/null
+git checkout src/ssh_audit/globals.py 2> /dev/null
+
+# Get the version from the globals.py file.
+version=$(grep VERSION src/ssh_audit/globals.py | awk 'BEGIN {FS="="} ; {print $2}' | tr -d '[:space:]')
+
+# Strip the quotes around the version (along with the initial 'v' character) and append "-1" to make the default Snap version (i.e.: 'v2.5.0' => '2.5.0-1')
+default_snap_version="${version:2:-1}-1"
+echo -e -n "\nEnter Snap package version [default: ${default_snap_version}]: "
+read -r snap_version
+
+# If no version was specified, use the default version.
+if [[ $snap_version == '' ]]; then
+    snap_version=$default_snap_version
+    echo -e "Using default snap version: ${snap_version}\n"
+fi
+
+# Ensure that the snap version fits the format of X.X.X-X.
+if [[ ! $snap_version =~ ^[0-9]\.[0-9]\.[0-9]\-[0-9]$ ]]; then
+   echo "Error: version string does not match format X.X.X-X!"
+   exit 1
+fi
+
+# Append the version field to the end of the file.  Not pretty, but it works.
+echo -e "\nversion: '${snap_version}'" >> snapcraft.yaml
+
+# Set the SNAP_PACKAGE variable to True so that file permission errors give more user-friendly 
+sed -i 's/SNAP_PACKAGE = False/SNAP_PACKAGE = True/' src/ssh_audit/globals.py
+
+snapcraft --use-lxd && echo -e "\nDone.\n"