Add `-debuglogfile` option

This patch adds an option to configure the name and/or directory of the
debug log.

The user can specify either a relative path, in which case the path
is relative to the data directory. They can also specify an absolute
path to put the log anywhere else in the file system.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/init.cpp b/src/init.cpp
index 9356862999..871a585267 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -342,6 +342,7 @@ std::string HelpMessage(HelpMessageMode mode)
     if (showDebug)
         strUsage += HelpMessageOpt("-feefilter", strprintf("Tell other nodes to filter invs to us by our mempool min fee (default: %u)", DEFAULT_FEEFILTER));
     strUsage += HelpMessageOpt("-loadblock=<file>", _("Imports blocks from external blk000??.dat file on startup"));
+    strUsage += HelpMessageOpt("-debuglogfile=<file>", strprintf(_("Specify location of debug log file: this can be an absolute path or a path relative to the data directory (default: %s)"), DEFAULT_DEBUGLOGFILE));
     strUsage += HelpMessageOpt("-maxorphantx=<n>", strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS));
     strUsage += HelpMessageOpt("-maxmempool=<n>", strprintf(_("Keep the transaction memory pool below <n> megabytes (default: %u)"), DEFAULT_MAX_MEMPOOL_SIZE));
     strUsage += HelpMessageOpt("-mempoolexpiry=<n>", strprintf(_("Do not keep transactions in the mempool longer than <n> hours (default: %u)"), DEFAULT_MEMPOOL_EXPIRY));
@@ -1209,8 +1210,11 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
         ShrinkDebugFile();
     }
 
-    if (fPrintToDebugLog)
-        OpenDebugLog();
+    if (fPrintToDebugLog) {
+        if (!OpenDebugLog()) {
+            return InitError(strprintf("Could not open debug log file %s", GetDebugLogPath().string()));
+        }
+    }
 
     if (!fLogTimestamps)
         LogPrintf("Startup time: %s\n", DateTimeStrFormat("%Y-%m-%d %H:%M:%S", GetTime()));