From 6f2ad916ae98a8a463ae132d02b86c6c0529fab4 Mon Sep 17 00:00:00 2001 From: Thomas Deutschmann Date: Thu, 30 Jul 2015 11:59:03 +0200 Subject: [PATCH 2/4] 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. Origin: https://salsa.debian.org/printing-team/ghostscript/-/blob/e4280f77c6f710a8b98ebe41e564e5fef9d23964/debian/patches/2010_add_build_timestamp_setting.patch Signed-off-by: Thomas Deutschmann Signed-off-by: Sam James --- base/gp_unix.c | 22 ++++++++++++++++++++++ devices/vector/gdevpdf.c | 4 +++- devices/vector/gdevpdfe.c | 4 +++- devices/vector/gdevpsu.c | 4 +++- 4 files changed, 31 insertions(+), 3 deletions(-) diff --git a/base/gp_unix.c b/base/gp_unix.c index 98db2ddf..8eee6a89 100644 --- 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 @@ void gp_get_realtime(long *pdt) { struct timeval tp; + const char *env; #if gettimeofday_no_timezone /* older versions of SVR4 */ { @@ -167,6 +169,26 @@ gp_get_realtime(long *pdt) } #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; diff --git a/devices/vector/gdevpdf.c b/devices/vector/gdevpdf.c index 40beb06a..f34055cf 100644 --- a/devices/vector/gdevpdf.c +++ b/devices/vector/gdevpdf.c @@ -428,6 +428,7 @@ pdf_initialize_ids(gx_device_pdf * pdev) 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 @@ pdf_initialize_ids(gx_device_pdf * pdev) 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 */ diff --git a/devices/vector/gdevpdfe.c b/devices/vector/gdevpdfe.c index 66767bd9..23557fad 100644 --- a/devices/vector/gdevpdfe.c +++ b/devices/vector/gdevpdfe.c @@ -199,6 +199,7 @@ pdf_xmp_time(char *buf, int buf_length) { /* 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 @@ pdf_xmp_time(char *buf, int buf_length) 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), diff --git a/devices/vector/gdevpsu.c b/devices/vector/gdevpsu.c index 123dda69..3eaa49aa 100644 --- a/devices/vector/gdevpsu.c +++ b/devices/vector/gdevpsu.c @@ -187,6 +187,7 @@ psw_begin_file_header(gp_file *f, const gx_device *dev, const gs_rect *pbbox, dev->dname); #endif { + long secs_ns[2]; time_t t; struct tm tms; @@ -194,7 +195,8 @@ psw_begin_file_header(gp_file *f, const gx_device *dev, const gs_rect *pbbox, 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", -- 2.55.0