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Use deterministic SOURCE_DATE_EPOCH for embedded timestamps in generated documentation.
Written by Eduard Sanou.
https://bugzilla.gnome.org/show_bug.cgi?id=758148
--- libxslt-1.1.28.orig/libexslt/date.c
+++ libxslt-1.1.28/libexslt/date.c
@@ -46,6 +46,7 @@
#include "exslt.h"
#include <string.h>
+#include <errno.h>
#ifdef HAVE_MATH_H
#include <math.h>
@@ -747,21 +748,46 @@ static exsltDateValPtr
exsltDateCurrent (void)
{
struct tm localTm, gmTm;
+ struct tm *tb = NULL;
time_t secs;
int local_s, gm_s;
exsltDateValPtr ret;
+ char *source_date_epoch;
ret = exsltDateCreateDate(XS_DATETIME);
if (ret == NULL)
return NULL;
- /* get current time */
secs = time(NULL);
+ /*
+ * Allow the date and time to be set externally by an exported
+ * environment variable to enable reproducible builds.
+ */
+ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
+ if (source_date_epoch) {
+ errno = 0;
+ secs = (time_t) strtol (source_date_epoch, NULL, 10);
+ if (errno == 0) {
+ tb = gmtime(&secs);
+ if (tb == NULL) {
+ /* SOURCE_DATE_EPOCH is not a valid date */
+ return NULL;
+ } else {
+ localTm = *tb;
+ }
+ } else {
+ /* SOURCE_DATE_EPOCH is not a valid number */
+ return NULL;
+ }
+ } else {
+ /* get current time */
#if HAVE_LOCALTIME_R
- localtime_r(&secs, &localTm);
+ localtime_r(&secs, &localTm);
#else
- localTm = *localtime(&secs);
+ localTm = *localtime(&secs);
#endif
+ }
+
/* get real year, not years since 1900 */
ret->value.date.year = localTm.tm_year + 1900;
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