[PATCH rebase 1/2] peflags: Add -p, --timestamp option

[Christian Franke]

Running 'peflags -p /bin/*.exe' with the patch applied suggests that 
objcopy/strip recently changed behavior and no longer set timestamps to 0.

Related: https://sourceware.org/bugzilla/show_bug.cgi?id=30702

-- 
Regards,
Christian

-------------- next part --------------
From 68d42574e4b7bbc0659708ce801b6cd25b88dc11 Mon Sep 17 00:00:00 2001
From: Christian Franke <christian.franke@t-online.de>
Date: Mon, 7 Aug 2023 14:02:12 +0200
Subject: [PATCH] peflags: Add -p, --timestamp option

This allows to set the header timestamp to 0 or some other fixed
value (SOURCE_DATE_EPOCH) to support reproducible builds.

Signed-off-by: Christian Franke <christian.franke@t-online.de>
---
 peflags.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/peflags.c b/peflags.c
index d98b121..f4b1812 100644
--- a/peflags.c
+++ b/peflags.c
@@ -131,6 +131,7 @@ enum {
   SIZEOF_HEAP_RESERVE,
   SIZEOF_HEAP_COMMIT,
   SIZEOF_CYGWIN_HEAP,
+  SIZEOF_TIMESTAMP,
   NUM_SIZEOF_VALUES		/* Keep at the end */
 };
 
@@ -152,7 +153,7 @@ typedef struct {
   ULONG       offset32;
 } sizeof_values_t;
 
-sizeof_values_t sizeof_vals[5] = {
+static sizeof_values_t sizeof_vals[NUM_SIZEOF_VALUES] = {
   { 0, "stack reserve size"      , "bytes", 0, FALSE,
     offsetof (IMAGE_NT_HEADERS64, OptionalHeader.SizeOfStackReserve),
     offsetof (IMAGE_NT_HEADERS32, OptionalHeader.SizeOfStackReserve),
@@ -172,6 +173,10 @@ sizeof_values_t sizeof_vals[5] = {
   { 0, "initial Cygwin heap size", "MB", 0, TRUE,
     offsetof (IMAGE_NT_HEADERS64, OptionalHeader.LoaderFlags),
     offsetof (IMAGE_NT_HEADERS32, OptionalHeader.LoaderFlags),
+  },
+  { 0, "file header timestamp", "seconds", 0, TRUE,
+    offsetof (IMAGE_NT_HEADERS64, FileHeader.TimeDateStamp),
+    offsetof (IMAGE_NT_HEADERS32, FileHeader.TimeDateStamp),
   }
 };
 
@@ -197,6 +202,7 @@ static struct option long_options[] = {
   {"heap-reserve", optional_argument, NULL, 'y'},
   {"heap-commit",  optional_argument, NULL, 'Y'},
   {"cygwin-heap",  optional_argument, NULL, 'z'},
+  {"timestamp",    optional_argument, NULL, 'p'},
   {"filelist",     no_argument, NULL, 'T'},
   {"verbose",      no_argument, NULL, 'v'},
   {"help",         no_argument, NULL, 'h'},
@@ -204,7 +210,7 @@ static struct option long_options[] = {
   {NULL, no_argument, NULL, 0}
 };
 static const char *short_options
-	= "d::e::c::f::n::i::s::b::W::t::w::l::S::x::X::y::Y::z::T:vhV";
+	= "d::e::c::f::n::i::s::b::W::t::w::l::S::x::X::y::Y::z::p::T:vhV";
 
 static void short_usage (FILE *f);
 static void help (FILE *f);
@@ -459,13 +465,22 @@ do_mark (const char *pathname)
 	{
 	  if (sizeof_vals[i].handle != DONT_HANDLE)
 	    {
-	      printf ("%*s%-24s: %" PRIu64 " (0x%" PRIx64 ") %s\n",
+              char extra[32] = "";
+	      if (verbose && i == SIZEOF_TIMESTAMP)
+		{
+		  time_t t = (time_t)sizeof_vals[i].value;
+		  const struct tm * tp = gmtime (&t);
+		  if (tp)
+		    strftime (extra, sizeof(extra), " [%Y-%m-%d %H:%M:%S UTC]", tp);
+		}
+
+	      printf ("%*s%-24s: %" PRIu64 " (0x%" PRIx64 ") %s%s\n",
 		      printed_characteristic ? (int) strlen (pathname) + 2
 					     : 0, "",
 		      sizeof_vals[i].name,
 		      (uint64_t) sizeof_vals[i].value,
 		      (uint64_t) sizeof_vals[i].value,
-		      sizeof_vals[i].unit);
+		      sizeof_vals[i].unit, extra);
 	      printed_characteristic = TRUE;
 	    }
 	}
@@ -786,6 +801,11 @@ parse_args (int argc, char *argv[])
 			     optarg,
 			     SIZEOF_CYGWIN_HEAP);
 	  break;
+	case 'p':
+	  handle_num_option (long_options[option_index].name,
+			     optarg,
+			     SIZEOF_TIMESTAMP);
+	  break;
 	case 'T':
 	  file_list = optarg;
 	  break;
@@ -1118,6 +1138,7 @@ help (FILE *f)
 "                              Useful values are between 4 and 2048.  If 0,\n"
 "                              Cygwin uses the default heap size of 384 Megs.\n"
 "                              Has no meaning for non-Cygwin applications.\n"
+"  -p, --timestamp     [NUM]   Timestamp in file header (seconds since epoch).\n"
 "  -T, --filelist FILE         Indicate that FILE contains a list\n"
 "                              of PE files to process\n"
 "  -v, --verbose               Display diagnostic information\n"
-- 
2.39.0