[autopkgtest] Convert the snapd-seed-glue autopkgtest to C++.

debian/changelog

@@ -1,3 +1,9 @@
+snapd-extra-utils (1.0.5) UNRELEASED; urgency=medium
+
+  * [autopkgtest] Convert the snapd-seed-glue autopkgtest to C++.
+
+ -- Simon Quigley <tsimonq2@ubuntu.com>  Sun, 24 Nov 2024 23:07:39 -0600
+
 snapd-extra-utils (1.0.4) plucky; urgency=medium
 
   * [autopkgtest] Use snaps that are available on all arches, to fix armhf,

debian/rules

@@ -9,4 +9,5 @@ export GOCACHE=$(CURDIR)/.gocache
 
 override_dh_auto_build:
 	(cd snapd-seed-glue && go build -gcflags="all=-N -l" -ldflags="-compressdwarf=false" -o snapd-seed-glue)
-	(cd snapd-installation-monitor && cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo . && make)
+	(cd snapd-seed-glue/tests && cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo . && make -j2 && mv snapd_seed_glue_test ../../debian/tests/snapd-seed-glue)
+	(cd snapd-installation-monitor && cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo . && make -j2)

debian/tests/snapd-seed-glue

@@ -1,40 +0,0 @@
-#!/bin/bash
-
-set -e
-
-# File to track command output, so we can check for successful completion
-OUTPUT_FILE=$(mktemp)
-
-# If the command output does not contain a final confirmation of success, exit 1
-confirm_success () {
-    if grep -q "Cleanup and validation completed" "$OUTPUT_FILE"; then
-        rm -f "$OUTPUT_FILE"
-    else
-        exit 1
-    fi
-}
-
-# Function to run snapd-seed-glue with given arguments
-run_snapd_seed_glue () {
-    /usr/bin/snapd-seed-glue --verbose --seed hello_test "$@" > >(tee -a "$OUTPUT_FILE") 2>&1
-    confirm_success
-}
-
-echo "[snapd-seed-glue autopkgtest] Testing snapd-seed-glue with hello..."
-
-run_snapd_seed_glue hello
-
-echo "[snapd-seed-glue autopkgtest] Add htop to the same seed..."
-
-run_snapd_seed_glue hello htop
-
-echo "[snapd-seed-glue autopkgtest] Remove htop and replace it with btop..."
-
-run_snapd_seed_glue hello btop
-
-echo "[snapd-seed-glue autopkgtest] Confirm that non-existent snaps will fail..."
-
-/usr/bin/snapd-seed-glue --verbose --seed test_dir absolutelyridiculouslongnamethatwilldefinitelyneverexist > >(tee -a "$OUTPUT_FILE") 2>&1 || echo "Fail expected"
-if ! grep -q "cannot install snap \"absolutelyridiculouslongnamethatwilldefinitelyneverexist\": snap not found" "$OUTPUT_FILE"; then
-    exit 1
-fi

snapd-seed-glue/tests/CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.14)
+project(snapd_seed_glue_test)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+add_executable(snapd_seed_glue_test cli-tests.cpp)

snapd-seed-glue/tests/cli-tests.cpp

@@ -0,0 +1,88 @@
+// Copyright (C) 2024 Simon Quigley <tsimonq2@ubuntu.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 3
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <cstdlib>
+#include <cstdio>
+#include <array>
+#include <stdexcept>
+#include <utility>
+
+std::string OUTPUT_FILE_CONTENTS;
+
+std::pair<std::string, int> execute_command(const std::string& cmd) {
+    std::array<char, 128> buffer{};
+    std::string result;
+    // Redirect stderr to stdout
+    std::string cmd_with_redirect = cmd + " 2>&1";
+    FILE* pipe = popen(cmd_with_redirect.c_str(), "r");
+    if (!pipe) throw std::runtime_error("popen() failed!");
+    while (fgets(buffer.data(), buffer.size(), pipe) != nullptr) {
+        result += buffer.data();
+        // Also echo the output to stdout
+        std::cout << buffer.data();
+    }
+    int rc = pclose(pipe);
+    int exit_code = WEXITSTATUS(rc);
+    return {result, exit_code};
+}
+
+void confirm_success() {
+    if (OUTPUT_FILE_CONTENTS.find("Cleanup and validation completed") != std::string::npos) {
+        // Success, clear OUTPUT_FILE_CONTENTS
+        OUTPUT_FILE_CONTENTS.clear();
+    } else {
+        exit(1);
+    }
+}
+
+void run_snapd_seed_glue(const std::vector<std::string>& args) {
+    std::string cmd = "/usr/bin/snapd-seed-glue --verbose --seed hello_test";
+    for (const auto& arg : args) {
+        cmd += " " + arg;
+    }
+    auto [output, exit_code] = execute_command(cmd);
+    // Append output to OUTPUT_FILE_CONTENTS
+    OUTPUT_FILE_CONTENTS += output;
+    if (exit_code != 0) {
+        exit(1);
+    }
+    confirm_success();
+}
+
+int main() {
+    std::cout << "[snapd-seed-glue autopkgtest] Testing snapd-seed-glue with hello...\n";
+    run_snapd_seed_glue({"hello"});
+
+    std::cout << "[snapd-seed-glue autopkgtest] Add htop to the same seed...\n";
+    run_snapd_seed_glue({"hello", "htop"});
+
+    std::cout << "[snapd-seed-glue autopkgtest] Remove htop and replace it with btop...\n";
+    run_snapd_seed_glue({"hello", "btop"});
+
+    std::cout << "[snapd-seed-glue autopkgtest] Confirm that non-existent snaps will fail...\n";
+    std::string invalid_snap = "absolutelyridiculouslongnamethatwilldefinitelyneverexist";
+    std::string cmd = "/usr/bin/snapd-seed-glue --verbose --seed test_dir " + invalid_snap;
+    auto [output, exit_code] = execute_command(cmd);
+    OUTPUT_FILE_CONTENTS += output;
+    if (exit_code != 0) {
+        std::cout << "Fail expected\n";
+    }
+    if (OUTPUT_FILE_CONTENTS.find("cannot install snap \"" + invalid_snap + "\": snap not found") != std::string::npos) {
+        // Expected error message found
+    } else {
+        exit(1);
+    }
+    return 0;
+}