Script to update Element.im to its latest version

update_element_im.sh

@@ -0,0 +1,83 @@
+#!/bin/bash
+
+set -e
+set -o errexit
+set -o pipefail
+set -o nounset
+set -x
+
+function version_gt() {
+    test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1";
+}
+
+function cleanup() {
+    local tmpdir=$1
+    rm -r "${tmpdir:?}"/*
+    rmdir "${tmpdir}"
+
+}
+
+function update() {
+    local tarball_url=$1
+    local gpg_url=$2
+    local tempdir=$3
+    local destination=$4
+
+    tarball_file=$(basename "${tarball_url}")
+    gpg_file=$(basename "${gpg_url}")
+
+    pushd "${tempdir}"
+    echo "Downloading..."
+    echo "Debug - ${tempdir} ${tarball_url}"
+    curl -L -O "${tarball_url}"
+    curl -L -O "${gpg_url}"
+
+    # GPG key of project
+    echo "Verifying the archive integrity..."
+    curl -s -O "https://github.com/RiotRobot.gpg"
+    gpg -o RiotRobot.ring --dearmor RiotRobot.gpg
+    gpg --no-default-keyring --keyring ./RiotRobot.ring --verify "${gpg_file}"
+
+    echo "Extracting archive..."
+    tar xfv "${tarball_file}"
+    folder_name=$(basename "${tarball_file}" .tar.gz)
+    # Update Element, but don't destroy the existing configuration
+    echo "Copying new files..."
+    rsync -rXH "${folder_name}/" "${destination}/" \
+        --delete \
+        --exclude config.json \
+        --chown "${WEB_USER}":"${WEB_USER}"
+    echo "Update complete."
+    popd
+}
+
+tmpdir=$(mktemp -d)
+
+trap 'cleanup ${tmpdir}' EXIT
+
+HOMESERVER_URL="https://chat.dennogumi.org"
+DESTINATION_PATH="/srv/www/htdocs/chat.dennogumi.org"
+WEB_USER="nginx"
+github_data=$(curl -s https://api.github.com/repos/vector-im/element-web/releases/latest)
+
+current_version=$(curl -s "${HOMESERVER_URL}/version")
+remote_version=$(echo "${github_data}" | jq '.name')
+
+echo "Checking for version updates..."
+
+if version_gt "${remote_version}" "${current_version}"
+then
+    asset_name=$(echo "${github_data}" | jq -r '.assets[] |
+            select(.browser_download_url|endswith("tar.gz")) |
+            select(.name|startswith("riot")).browser_download_url')
+    gpg_key_name=$(
+        echo "${github_data}" | jq -r '.assets[] |
+            select(.browser_download_url|endswith("asc")) |
+            select(.name|startswith("riot")).browser_download_url')
+    echo "Updating Element.im from ${current_version} to ${remote_version}..."
+    update "${asset_name}" "${gpg_key_name}" "${tmpdir}" "${DESTINATION_PATH}"
+else
+    echo "No new update: nothing to do."
+fi
+
+exit 0