Author: Danny Milosavljevic <dannym@friendly-machines.com>
Date: Mon Jun  9 01:19:28 PM CEST 2025
Subject: Make mono 2.4.2.3 reprodubile.

diff -ru orig/mono-1.9.1-checkout/mcs/class/corlib/System.Reflection.Emit/ModuleBuilder.cs mono-1.9.1-checkout/mcs/class/corlib/System.Reflection.Emit/ModuleBuilder.cs
--- orig/mono-1.9.1-checkout/mcs/class/corlib/System.Reflection.Emit/ModuleBuilder.cs	2025-06-09 11:58:58.679365113 +0200
+++ mono-1.9.1-checkout/mcs/class/corlib/System.Reflection.Emit/ModuleBuilder.cs	2025-06-09 19:10:46.839764717 +0200
@@ -80,7 +80,7 @@
 			this.assembly = this.assemblyb = assb;
 			this.transient = transient;
 			// to keep mcs fast we do not want CryptoConfig wo be involved to create the RNG
-			guid = Guid.FastNewGuidArray ();
+			guid = new byte[16]; // = Guid.Empty.ToByteArray();
 			// guid = Guid.NewGuid().ToByteArray ();
 			table_idx = get_next_table_index (this, 0x00, true);
 			name_cache = new Hashtable ();
diff -ru orig/mono-1.9.1-checkout/mcs/class/Mono.Cecil/Mono.Cecil.Binary/ImageInitializer.cs mono-1.9.1-checkout/mcs/class/Mono.Cecil/Mono.Cecil.Binary/ImageInitializer.cs
--- orig/mono-1.9.1-checkout/mcs/class/Mono.Cecil/Mono.Cecil.Binary/ImageInitializer.cs	2025-06-09 11:58:58.233978153 +0200
+++ mono-1.9.1-checkout/mcs/class/Mono.Cecil/Mono.Cecil.Binary/ImageInitializer.cs	2025-06-09 16:46:46.086454131 +0200
@@ -132,6 +132,15 @@
 
 		public static uint TimeDateStampFromEpoch ()
 		{
+			string sourceDateEpoch = Environment.GetEnvironmentVariable("SOURCE_DATE_EPOCH");
+			if (sourceDateEpoch != null && sourceDateEpoch != "") {
+				try {
+					return uint.Parse(sourceDateEpoch);
+				} catch {
+					// fallthrough
+				}
+			}
+			
 			return (uint) DateTime.UtcNow.Subtract (
 				new DateTime (1970, 1, 1)).TotalSeconds;
 		}
diff -ru orig/mono-1.9.1-checkout/mono/metadata/reflection.c mono-1.9.1-checkout/mono/metadata/reflection.c
--- orig/mono-1.9.1-checkout/mono/metadata/reflection.c	2025-06-09 11:58:58.903462701 +0200
+++ mono-1.9.1-checkout/mono/metadata/reflection.c	2025-06-09 18:44:58.063693593 +0200
@@ -4851,7 +4851,7 @@
 	
 	header->coff.coff_machine = GUINT16_FROM_LE (assemblyb->machine);
 	header->coff.coff_sections = GUINT16_FROM_LE (nsections);
-	header->coff.coff_time = GUINT32_FROM_LE (time (NULL));
+	header->coff.coff_time = GUINT32_FROM_LE (getenv("SOURCE_DATE_EPOCH") ? atoi(getenv("SOURCE_DATE_EPOCH")) : time (NULL));
 	header->coff.coff_opt_header_size = GUINT16_FROM_LE (sizeof (MonoDotNetHeader) - sizeof (MonoCOFFHeader) - 4);
 	if (assemblyb->pekind == 1) {
 		/* it's a dll */