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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
@@ -427,6 +427,7 @@
*/
{
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;
@@ -438,7 +439,8 @@
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_sprintf(buf1,
--- a/devices/vector/gdevpsu.c
+++ b/devices/vector/gdevpsu.c
@@ -183,6 +183,7 @@
fprintf(f, "%%%%Creator: %s %ld (%s)\n", gs_product, (long)gs_revision,
dev->dname);
{
+ long secs_ns[2];
time_t t;
struct tm tms;
@@ -190,7 +191,8 @@
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",
|