Description: Allow the build timestamp to be externally set

 In order to make Ghostscript output reproducible, we need a way to

 set the build timestamp to other values than the current time.

 We now consistently use gp_get_realtime() instead of directly calling

 time() or gp_get_usertime() and make gp_get_realtime() use the value

 found in the SOURCE_DATE_EPOCH environment variable if set. Also,

 environment timezone is fixed to UTC if SOURCE_DATE_EPOCH is used to

 avoid variations.

Author: Eduard Sanou <dhole@openmailbox.org>

Author: Peter De Wachter <pdewacht@gmail.com>

Bug-Debian: https://bugs.debian.org/794004

Last-Update: 2015-07-30

---

This patch header follows DEP-3: https://dep.debian.net/deps/dep3/

--- a/base/gp_unix.c

+++ b/base/gp_unix.c

@@ -19,6 +19,7 @@

 #ifdef __MINGW32__

 #  include "windows_.h"

 #endif

+#include "errno_.h"

 #include "pipe_.h"

 #include "string_.h"

 #include "time_.h"

@@ -148,6 +149,7 @@

 gp_get_realtime(long *pdt)

 {

     struct timeval tp;

+    const char *env;

 #if gettimeofday_no_timezone    /* older versions of SVR4 */

     {

@@ -167,6 +169,26 @@

     }

 #endif

+    env = getenv("SOURCE_DATE_EPOCH");

+    if (env) {

+        char *end;

+        long timestamp;

+

+        errno = 0;

+        timestamp = strtol(env, &end, 10);

+        if (env == end || *end || errno != 0) {

+            lprintf("Ghostscript: SOURCE_DATE_EPOCH is not a number!\n");

+            timestamp = 0;

+        }

+

+        tp.tv_sec = timestamp;

+        tp.tv_usec = 0;

+

+        /* We need to fix the environment timezone to get reproducible */

+        /* results when parsing the result of gp_get_realtime. */

+        setenv("TZ", "UTC", 1);

+    }

+

     /* tp.tv_sec is #secs since Jan 1, 1970 */

     pdt[0] = tp.tv_sec;

--- a/devices/vector/gdevpdf.c

+++ b/devices/vector/gdevpdf.c

@@ -428,6 +428,7 @@

     if (!pdev->OmitInfoDate)

     {

         struct tm tms;

+        long secs_ns[2];

         time_t t;

         char buf[1+2+4+2+2+2+2+2+1+2+1+2+1+1+1]; /* (D:yyyymmddhhmmssZhh'mm')\0 */

         int timeoffset;

@@ -439,7 +440,8 @@

         timesign = 'Z';

         timeoffset = 0;

 #else

-        time(&t);

+        gp_get_realtime(secs_ns);

+        t = secs_ns[0];

         tms = *gmtime(&t);

         tms.tm_isdst = -1;

         timeoffset = (int)difftime(t, mktime(&tms)); /* tz+dst in seconds */

--- a/devices/vector/gdevpdfe.c

+++ b/devices/vector/gdevpdfe.c

@@ -199,6 +199,7 @@

 {

     /* We don't write a day time because we don't have a time zone. */

     struct tm tms;

+    long secs_ns[2];

     time_t t;

     char buf1[4+1+2+1+2+1]; /* yyyy-mm-dd\0 */

@@ -206,7 +207,8 @@

     memset(&t, 0, sizeof(t));

     memset(&tms, 0, sizeof(tms));

 #else

-    time(&t);

+    gp_get_realtime(secs_ns);

+    t = secs_ns[0];

     tms = *localtime(&t);

 #endif

     gs_snprintf(buf1, sizeof(buf1),

--- a/devices/vector/gdevpsu.c

+++ b/devices/vector/gdevpsu.c

@@ -187,6 +187,7 @@

             dev->dname);

 #endif

     {

+        long secs_ns[2];

         time_t t;

         struct tm tms;

@@ -194,7 +195,8 @@

         memset(&t, 0, sizeof(t));

         memset(&tms, 0, sizeof(tms));

 #else

-        time(&t);

+        gp_get_realtime(secs_ns);

+        t = secs_ns[0];

         tms = *localtime(&t);

 #endif

         fprintf(f, "%%%%CreationDate: %d/%02d/%02d %02d:%02d:%02d\n",