From 2c959069b7f9385107570b4d441781ef8466f717 Mon Sep 17 00:00:00 2001
From: Jonas Kvinge <jonas@jkvinge.net>
Date: Sun, 22 Sep 2019 19:39:45 +0200
Subject: Use geteuid and getpwuid to get username on Unix, fallback to
 environment variable (#72)

* Use geteuid and getpwuid to get username on Unix, fallback to environment variable

* Remove QProcess include
---
 singleapplication_p.cpp | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/singleapplication_p.cpp b/singleapplication_p.cpp
index de4945e..a129aa0 100644
--- a/singleapplication_p.cpp
+++ b/singleapplication_p.cpp
@@ -33,11 +33,8 @@
 #include <cstddef>
 
 #include <QtCore/QDir>
-#include <QtCore/QProcess>
 #include <QtCore/QByteArray>
-#include <QtCore/QSemaphore>
 #include <QtCore/QDataStream>
-#include <QtCore/QStandardPaths>
 #include <QtCore/QCryptographicHash>
 #include <QtNetwork/QLocalServer>
 #include <QtNetwork/QLocalSocket>
@@ -45,6 +42,12 @@
 #include "singleapplication.h"
 #include "singleapplication_p.h"
 
+#ifdef Q_OS_UNIX
+    #include <unistd.h>
+    #include <sys/types.h>
+    #include <pwd.h>
+#endif
+
 #ifdef Q_OS_WIN
     #include <windows.h>
     #include <lmcons.h>
@@ -109,22 +112,22 @@ void SingleApplicationPrivate::genBlockServerName()
         if( GetUserNameW( username, &usernameLength ) ) {
             appData.addData( QString::fromWCharArray(username).toUtf8() );
         } else {
-            appData.addData( QStandardPaths::standardLocations( QStandardPaths::HomeLocation ).join("").toUtf8() );
+            appData.addData( qgetenv("USERNAME") );
         }
 #endif
 #ifdef Q_OS_UNIX
-        QProcess process;
-        process.start( "whoami" );
-        if( process.waitForFinished( 100 ) &&
-            process.exitCode() == QProcess::NormalExit) {
-            appData.addData( process.readLine() );
-        } else {
-            appData.addData(
-                QDir(
-                    QStandardPaths::standardLocations( QStandardPaths::HomeLocation ).first()
-                ).absolutePath().toUtf8()
-            );
+        QByteArray username;
+        uid_t uid = geteuid();
+        if( uid != -1 ) {
+            struct passwd *pw = getpwuid(uid);
+            if( pw ) {
+                username = pw->pw_name;
+            }
+        }
+        if( username.isEmpty() ) {
+            username = qgetenv("USER");
         }
+        appData.addData(username);
 #endif
     }
 
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