ghostscript/trunk/2010_add_build_timestamp_setting.patch

   1 Description: Allow the build timestamp to be externally set
   2  In order to make Ghostscript output reproducible, we need a way to
   3  set the build timestamp to other values than the current time.
   4  We now consistently use gp_get_realtime() instead of directly calling
   5  time() or gp_get_usertime() and make gp_get_realtime() use the value
   6  found in the SOURCE_DATE_EPOCH environment variable if set. Also,
   7  environment timezone is fixed to UTC if SOURCE_DATE_EPOCH is used to
   8  avoid variations.
   9 Author: Eduard Sanou <dhole@openmailbox.org>
  10 Author: Peter De Wachter <pdewacht@gmail.com>
  11 Bug-Debian: https://bugs.debian.org/794004
  12 Last-Update: 2015-07-30
  13 ---
  14 This patch header follows DEP-3: https://dep.debian.net/deps/dep3/
  15 --- a/base/gp_unix.c
  16 +++ b/base/gp_unix.c
  17 @@ -19,6 +19,7 @@
  18  #ifdef __MINGW32__
  19  #  include "windows_.h"
  20  #endif
  21 +#include "errno_.h"
  22  #include "pipe_.h"
  23  #include "string_.h"
  24  #include "time_.h"
  25 @@ -148,6 +149,7 @@
  26  gp_get_realtime(long *pdt)
  27  {
  28      struct timeval tp;
  29 +    const char *env;
  30
  31  #if gettimeofday_no_timezone    /* older versions of SVR4 */
  32      {
  33 @@ -167,6 +169,26 @@
  34      }
  35  #endif
  36
  37 +    env = getenv("SOURCE_DATE_EPOCH");
  38 +    if (env) {
  39 +        char *end;
  40 +        long timestamp;
  41 +
  42 +        errno = 0;
  43 +        timestamp = strtol(env, &end, 10);
  44 +        if (env == end || *end || errno != 0) {
  45 +            lprintf("Ghostscript: SOURCE_DATE_EPOCH is not a number!\n");
  46 +            timestamp = 0;
  47 +        }
  48 +
  49 +        tp.tv_sec = timestamp;
  50 +        tp.tv_usec = 0;
  51 +
  52 +        /* We need to fix the environment timezone to get reproducible */
  53 +        /* results when parsing the result of gp_get_realtime. */
  54 +        setenv("TZ", "UTC", 1);
  55 +    }
  56 +
  57      /* tp.tv_sec is #secs since Jan 1, 1970 */
  58      pdt[0] = tp.tv_sec;
  59
  60 --- a/devices/vector/gdevpdf.c
  61 +++ b/devices/vector/gdevpdf.c
  62 @@ -427,6 +427,7 @@
  63       */
  64      {
  65          struct tm tms;
  66 +        long secs_ns[2];
  67          time_t t;
  68          char buf[1+2+4+2+2+2+2+2+1+2+1+2+1+1+1]; /* (D:yyyymmddhhmmssZhh'mm')\0 */
  69          int timeoffset;
  70 @@ -438,7 +439,8 @@
  71          timesign = 'Z';
  72          timeoffset = 0;
  73  #else
  74 -        time(&t);
  75 +        gp_get_realtime(secs_ns);
  76 +        t = secs_ns[0];
  77          tms = *gmtime(&t);
  78          tms.tm_isdst = -1;
  79          timeoffset = (int)difftime(t, mktime(&tms)); /* tz+dst in seconds */
  80 --- a/devices/vector/gdevpdfe.c
  81 +++ b/devices/vector/gdevpdfe.c
  82 @@ -199,6 +199,7 @@
  83  {
  84      /* We don't write a day time because we don't have a time zone. */
  85      struct tm tms;
  86 +    long secs_ns[2];
  87      time_t t;
  88      char buf1[4+1+2+1+2+1]; /* yyyy-mm-dd\0 */
  89
  90 @@ -206,7 +207,8 @@
  91      memset(&t, 0, sizeof(t));
  92      memset(&tms, 0, sizeof(tms));
  93  #else
  94 -    time(&t);
  95 +    gp_get_realtime(secs_ns);
  96 +    t = secs_ns[0];
  97      tms = *localtime(&t);
  98  #endif
  99      gs_sprintf(buf1,
 100 --- a/devices/vector/gdevpsu.c
 101 +++ b/devices/vector/gdevpsu.c
 102 @@ -183,6 +183,7 @@
 103      fprintf(f, "%%%%Creator: %s %ld (%s)\n", gs_product, (long)gs_revision,
 104              dev->dname);
 105      {
 106 +        long secs_ns[2];
 107          time_t t;
 108          struct tm tms;
 109
 110 @@ -190,7 +191,8 @@
 111          memset(&t, 0, sizeof(t));
 112          memset(&tms, 0, sizeof(tms));
 113  #else
 114 -        time(&t);
 115 +        gp_get_realtime(secs_ns);
 116 +        t = secs_ns[0];
 117          tms = *localtime(&t);
 118  #endif
 119          fprintf(f, "%%%%CreationDate: %d/%02d/%02d %02d:%02d:%02d\n",