Bug 751984 - PATCH: Honour SOURCE_DATE_EPOCH environment variable for reproducible output

1 files changed, 30 insertions, 0 deletions

diff --git a/src/util.cpp b/src/util.cpp
index d367c40..db6a19c 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -18,6 +18,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <math.h>
+#include <limits.h>
 
 #include "md5.h"
 
@@ -2472,6 +2473,35 @@ QCString fileToString(const char *name,bool filter,bool isSourceCode)
 QCString dateToString(bool includeTime)
 {
   QDateTime current = QDateTime::currentDateTime();
+  QCString sourceDateEpoch = portable_getenv("SOURCE_DATE_EPOCH");
+  if (!sourceDateEpoch.isEmpty())
+  {
+    bool ok;
+    uint64 epoch = sourceDateEpoch.toUInt64(&ok);
+    if (!ok)
+    {
+      static bool warnedOnce=FALSE;
+      if (!warnedOnce)
+      {
+        warn_uncond("Environment variable SOURCE_DATE_EPOCH does not contain a valid number; value is '%s'\n",
+            sourceDateEpoch.data());
+        warnedOnce=TRUE;
+      }
+    }
+    else if (epoch>UINT_MAX)
+    {
+      static bool warnedOnce=FALSE;
+      if (!warnedOnce)
+      {
+        warn_uncond("Environment variable SOURCE_DATA_EPOCH must have a value smaller than or equal to %llu; actual value %llu\n",UINT_MAX,epoch);
+        warnedOnce=TRUE;
+      }
+    }
+    else // all ok, replace current time with epoch value
+    {
+      current.setTime_t((ulong)epoch); // TODO: add support for 64bit epoch value
+    }
+  }
   return theTranslator->trDateTime(current.date().year(),
                                    current.date().month(),
                                    current.date().day(),