Move XRD debug settings to copy shell command

To avoid interference of ALIENPY_DEBUG and XRD_LOGLEVEL set for CTF copy failures debugging
with CCDB fetches from alien, which pollute stdout.

Author: shahor02

Common/Utils/src/FileFetcher.cxx

@@ -329,6 +329,7 @@ bool FileFetcher::copyFile(size_t id)
   bool aliencpMode = false;
   std::string uuid{};
   std::vector<std::string> logsToClean;
+  std::string dbgset{};
   if (mCopyCmd.find("alien") != std::string::npos) {
     if (!gGrid && !TGrid::Connect("alien://")) {
       LOG(error) << "Copy command refers to alien but connection to Grid failed";
@@ -339,18 +340,18 @@ bool FileFetcher::copyFile(size_t id)
         c = '_';
       }
     }
-    gSystem->Setenv("ALIENPY_DEBUG", "1");
-    logsToClean.push_back(fmt::format("log_alienpy_{}.txt", uuid));
-    gSystem->Setenv("ALIENPY_DEBUG_FILE", logsToClean.back().c_str());
-    gSystem->Setenv("XRD_LOGLEVEL", "Dump");
-    logsToClean.push_back(fmt::format("log_xrd_{}.txt", uuid));
-    gSystem->Setenv("XRD_LOGFILE", logsToClean.back().c_str());
-    LOGP(info, "debug log files for {}: ALIENPY_DEBUG_FILE={} XRD_LOGFILE={}", mInputFiles[id].getOrigName(),
-         getenv("ALIENPY_DEBUG_FILE") ? getenv("ALIENPY_DEBUG_FILE") : "",
-         getenv("XRD_LOGFILE") ? getenv("XRD_LOGFILE") : "");
+    if (!(getenv("ALIENPY_DEBUG") && std::stoi(getenv("ALIENPY_DEBUG")) == 1)) {
+      logsToClean.push_back(fmt::format("log_alienpy_{}.txt", uuid));
+      dbgset += fmt::format("ALIENPY_DEBUG=1 ALIENPY_DEBUG_FILE={} ", logsToClean.back());
+    }
+    if (!(getenv("XRD_LOGLEVEL") && strcmp(getenv("XRD_LOGLEVEL"), "Dump") == 0)) {
+      logsToClean.push_back(fmt::format("log_xrd_{}.txt", uuid));
+      dbgset += fmt::format("XRD_LOGLEVEL=Dump XRD_LOGFILE={} ", logsToClean.back());
+    }
+    LOGP(debug, "debug setting for for {}: {}", mInputFiles[id].getOrigName(), dbgset);
   }
   auto realCmd = std::regex_replace(std::regex_replace(mCopyCmd, std::regex(R"(\?src)"), mInputFiles[id].getOrigName()), std::regex(R"(\?dst)"), mInputFiles[id].getLocalName());
-  auto fullCmd = fmt::format(R"(sh -c "{}" >> {}  2>&1)", realCmd, mCopyCmdLogFile);
+  auto fullCmd = fmt::format(R"(sh -c "{}{}" >> {}  2>&1)", dbgset, realCmd, mCopyCmdLogFile);
   LOG(info) << "Executing " << fullCmd;
   const auto sysRet = gSystem->Exec(fullCmd.c_str());
   if (sysRet != 0) {