Add -u / --upgrade to update to latest release

README.md

@@ -117,6 +117,39 @@ Following command will create `wgclient_client_name.conf` file.
 
     ./easy-wg-quick client_name
 
+### Special usage
+
+#### -h / --help
+
+Displays help for all supported arguments.
+
+#### -i / --init
+
+Writes the initial configuration to text files without creating a client or
+hub configuration. This option is useful if you want to change auto-detected
+or default configuration values. Repeat the script with the client name to
+create the final configuration.
+
+#### -c / --clear
+
+To start over, manually remove all `*.bak`, `*.conf`, `*.key`, and `*.psk`
+files. If you need to remove initial configuration options as well, also
+delete all `*.txt` files. This script does not remove anything.
+
+#### -d / --install-wg-quick
+
+This option will download and install the wg-quick script from the official
+Wireguard GitHub mirror based on the current operating system (Linux, FreeBSD,
+OpenBSD and Darwin are supported).
+
+If run as `root`, it will install `wg-quick` in `/usr/local/sbin`. If run as
+a normal user, it will use `$HOME/.local/bin`.
+
+#### -u / --upgrade
+
+This will download the latest release of that script and replace the original
+file with the downloaded version.
+
 ### Sample output
 
 ```

easy-wg-quick

@@ -1,6 +1,6 @@
 #!/bin/sh
 # easy-wg-quick - Creates WireGuard configuration for hub and peers with ease
-# Copyright (C) 2019-2023 Krzysztof Burghardt <[email protected]>
+# Copyright (C) 2019-2024 Krzysztof Burghardt <[email protected]>
 #
 #
 # License
@@ -691,11 +691,49 @@ download_and_install_wg_quick() {
     }
 }
 
+upgrade_easy_wg_quick() {
+    REPO='burghardt/easy-wg-quick'
+    APIURL="https://api.github.com/repos/${REPO}/releases/latest"
+
+    APIDATA="$(curl -sL "${APIURL}" ||
+        wget -qO- "${APIURL}" ||
+        fetch -qo- "${APIURL}")"
+    TAG="$(echo "${APIDATA}" | grep -oP '"tag_name": "\K(.*?)(?=")')"
+    DLURL="https://raw.githubusercontent.com/${REPO}/${TAG}/easy-wg-quick"
+
+    DLFILE=$(mktemp -qt 'wg-quick.XXXXXXXXXX') || {
+        echo "Failed to create temporary file."
+        exit 1
+    }
+    cleanup() {
+        # until https://github.com/koalaman/shellcheck/issues/2660 resolved
+        # shellcheck disable=SC2317
+        rm -f "${DLFILE}"
+    }
+    trap cleanup EXIT
+
+    curl -sL "${DLURL}" -o "${DLFILE}" > /dev/null 2>&1 ||
+        wget -qO "${DLFILE}" "${DLURL}" > /dev/null 2>&1 ||
+        fetch -q -o "${DLFILE}" "${DLURL}" > /dev/null 2>&1 || {
+        echo "Download of ${DLURL} failed."
+        exit 1
+    }
+
+    echo "Installing easy-wg-quick ${TAG} to $0."
+    chmod +x "${DLFILE}"
+    mv "${DLFILE}" "$0" || {
+        echo "Failed to install ${DLFILE} as $0."
+        exit 1
+    }
+    true
+}
+
 print_usage() {
     echo "Usage: $0 [client_name] - create new client with optional [client_name]"
     echo "       $0 -i / --init   - create initial configuration without any clients"
     echo "       $0 -c / --clear  - clear the configuration and start over"
     echo "       $0 -d / --install-wg-quick - download and install wg-quick script"
+    echo "       $0 -u / --upgrade - update $0 from latest GitHub release"
     exit 1
 }
 
@@ -725,6 +763,10 @@ main() {
             download_and_install_wg_quick
             exit 0
             ;;
+        "-u" | "--upgrade")
+            upgrade_easy_wg_quick
+            exit 0
+            ;;
         *)
             CONF_NAME="$1"
             ;;

tests/arguments.bats

@@ -74,7 +74,7 @@ load teardown setup
 @test "run with -d parameter" {
     run ../easy-wg-quick -d
     [[ "$status" -eq 0 ]]
-    [[ "${#lines[@]}" -ge 0 ]]
+    [[ "${#lines[@]}" -ge 1 ]]
 
     if [[ "$(id -u)" -eq 0 ]]; then
         [[ -x /usr/local/sbin/wg-quick ]]
@@ -86,7 +86,7 @@ load teardown setup
 @test "run with --install-wg-quick parameter" {
     run ../easy-wg-quick --install-wg-quick
     [[ "$status" -eq 0 ]]
-    [[ "${#lines[@]}" -ge 0 ]]
+    [[ "${#lines[@]}" -ge 1 ]]
 
     if [[ "$(id -u)" -eq 0 ]]; then
         [[ -x /usr/local/sbin/wg-quick ]]
@@ -95,6 +95,22 @@ load teardown setup
     fi
 }
 
+@test "run with -u parameter" {
+    cp ../easy-wg-quick ./easy-wg-quick-to-upgrade
+    run ./easy-wg-quick-to-upgrade -u
+    [[ "$status" -eq 0 ]]
+    [[ "${#lines[@]}" -ge 1 ]]
+    rm ./easy-wg-quick-to-upgrade
+}
+
+@test "run with --upgrade parameter" {
+    cp ../easy-wg-quick ./easy-wg-quick-to-upgrade
+    run ./easy-wg-quick-to-upgrade --upgrade
+    [[ "$status" -eq 0 ]]
+    [[ "${#lines[@]}" -ge 1 ]]
+    rm ./easy-wg-quick-to-upgrade
+}
+
 @test "run with too many parameters" {
     run ../easy-wg-quick foo bar
     [[ "$status" -eq 1 ]]