commit 95f1c7e9081866ea1e716743ea039a74565f80c6
Author: Louis Sautier <sautier.louis@gmail.com>
Date:   Sun Jul 15 15:36:21 2018 +0200

    Allow integration tests to be run inside a different root
    
    Based on DarthGandalf's patch submitted in
    https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=15112014e7605d13624297d7601504b5d187a6de

diff --git a/include/znc/znc.h b/include/znc/znc.h
index ecb2b41a..a791a648 100644
--- a/include/znc/znc.h
+++ b/include/znc/znc.h
@@ -251,6 +251,7 @@ class CZNC : private CCoreTranslationMixin {
     void DisableConfigTimer();
 
     static void DumpConfig(const CConfig* Config);
+    static CString UnusualRoot();
 
   private:
     static CString FormatBindError();
diff --git a/src/Modules.cpp b/src/Modules.cpp
index 5aec7805..6f9c34ae 100644
--- a/src/Modules.cpp
+++ b/src/Modules.cpp
@@ -1899,9 +1899,10 @@ CModules::ModDirList CModules::GetModDirs() {
     sDir = CZNC::Get().GetModPath() + "/";
     ret.push(std::make_pair(sDir, sDir));
 
+    CString sUnusualRoot = CZNC::UnusualRoot();
     // <moduledir> and <datadir> (<prefix>/lib/znc)
-    ret.push(std::make_pair(_MODDIR_ + CString("/"),
-                            _DATADIR_ + CString("/modules/")));
+    ret.push(std::make_pair(sUnusualRoot + _MODDIR_ + CString("/"),
+                            sUnusualRoot + _DATADIR_ + CString("/modules/")));
 
     return ret;
 }
diff --git a/src/WebModules.cpp b/src/WebModules.cpp
index a5841987..f1b8a421 100644
--- a/src/WebModules.cpp
+++ b/src/WebModules.cpp
@@ -565,7 +565,7 @@ CString CWebSock::GetSkinPath(const CString& sSkinName) {
         sRet = CZNC::Get().GetCurPath() + "/webskins/" + sSkin;
 
         if (!CFile::IsDir(sRet)) {
-            sRet = CString(_SKINDIR_) + "/" + sSkin;
+            sRet = CZNC::UnusualRoot() + CString(_SKINDIR_) + "/" + sSkin;
         }
     }
 
diff --git a/src/znc.cpp b/src/znc.cpp
index 4e7216ee..dd901497 100644
--- a/src/znc.cpp
+++ b/src/znc.cpp
@@ -2130,3 +2130,8 @@ void CZNC::DisableConfigTimer() {
         m_pConfigTimer = nullptr;
     }
 }
+
+CString CZNC::UnusualRoot() {
+    char* szUnusualRoot = getenv("ZNC_UNUSUAL_ROOT");
+    return szUnusualRoot ? szUnusualRoot : "";
+}