sysinfo: add a trivial system stats dump function

CMakeLists.txt

@@ -210,6 +210,13 @@ else ()
 endif ()
 
 
+if (WIN32)
+    list (APPEND UTIL_FILES sysinfo_win32.cpp)
+else ()
+    list (APPEND UTIL_FILES sysinfo_posix.cpp)
+endif ()
+
+
 ###############################################################################
 # Common files
 list (
@@ -467,6 +474,7 @@ list (
     stringid.hpp
     strongdef.cpp
     strongdef.hpp
+    sysinfo.hpp
     tap.cpp
     tap.hpp
     term.cpp

meson.build

@@ -198,6 +198,15 @@ else
 endif
 
 
+if host_machine.system() == 'linux'
+    sources += [ 'sysinfo_posix.cpp' ]
+elif host_machine.system() == 'windows'
+    sources += [ 'sysinfo_win32.cpp' ]
+else
+    error('Unsupported system for sysinfo')
+endif
+
+
 #################################################################################
 ### Common files
 sources += [
@@ -452,6 +461,7 @@ sources += [
     'stringid.hpp',
     'strongdef.cpp',
     'strongdef.hpp',
+    'sysinfo.hpp',
     'tap.cpp',
     'tap.hpp',
     'term.cpp',

sysinfo.hpp

@@ -0,0 +1,25 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2019 Danny Robson <danny@nerdcruft.net>
+ */
+
+#pragma once
+
+#include <iosfwd>
+#include <string>
+
+namespace cruft::util {
+    /// A tag structure that can be passed to an ostream which will print a
+    /// collection of system environment values in a JSONish format that
+    /// might be suitable for triaging bug reports.
+    ///
+    /// If you want something specific it would be better to avoid populating
+    /// this structure directly and instead write a query that exposes the
+    /// value directly.
+    struct sysinfo { };
+
+    std::ostream& operator<< (std::ostream &, sysinfo const&);
+}

sysinfo_posix.cpp

@@ -0,0 +1,44 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2019 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "sysinfo.hpp"
+
+#include "posix/except.hpp"
+
+#include <ostream>
+
+#include <pwd.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+#include <unistd.h>
+
+using cruft::util::sysinfo;
+
+
+///////////////////////////////////////////////////////////////////////////////
+std::ostream&
+cruft::util::operator<< (std::ostream &os, sysinfo const &)
+{
+    os << "{ ";
+
+    {
+        struct utsname name;
+        cruft::posix::error::try_code (uname (&name));
+
+        os << "os: { name: " << name.sysname << ", version: " << name.version
+           << " }, hostname: " << name.nodename;
+    }
+
+    {
+        auto const uid = geteuid ();
+        auto const user = getpwuid (uid);
+        os << ", username: " << user->pw_name;
+    }
+
+    return os << " }";
+}

sysinfo_win32.cpp

@@ -0,0 +1,61 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2019 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "sysinfo.hpp"
+
+#include "win32/windows.hpp"
+#include "win32/except.hpp"
+
+#include <ostream>
+
+
+///////////////////////////////////////////////////////////////////////////////
+std::ostream&
+cruft::util::operator<< (std::ostream &os, sysinfo const &)
+{
+    os << "{ ";
+
+    {
+        OSVERSIONINFO version;
+        if (!GetVersionExA (&version))
+            win32::error::throw_code ();
+
+        os << "os: { name: win32, "
+               << ", version: " << +version.dwMajorVersion << '.'
+                                << +version.dwMinorVersion << '.'
+                                << +version.dwPlatformId
+               << "}";
+    }
+
+    DWORD size = 0;
+    std::string name;
+
+    {
+        if (!GetComputerNameExA (ComputerNamePhysicalNetBIOS, nullptr, &size))
+            win32::error::throw_code ();
+        name.resize (size);
+
+        if (!GetComputerNameExA (ComputerNamePhysicalNetBIOS, &name[0], &size))
+            win32::error::throw_code ();
+        os << ", hostname: " << name;
+    }
+
+    {
+        size = 0;
+        if (!GetUserNameA (nullptr, &size))
+            win32::error::throw_code ();
+        name.resize (size);
+
+        if (!GetUserNameA (&name[0], &size))
+            win32::error::throw_code ();
+
+        os << ", username: " << name;
+    }
+
+    return os << " }";
+}