in order to make builds reproducible.
See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.
---
1st draft: probably has some year-2038 problems left
---
zip.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/zip.c b/zip.c
index 337932c..b5c8867 100644
--- a/zip.c
+++ b/zip.c
@@ -19,6 +19,7 @@
#include <config.h>
#include <ctype.h>
+#include <stdlib.h>
#include "tailor.h"
#include "gzip.h"
@@ -34,6 +35,7 @@ off_t header_bytes; /* number of bytes in gzip header */
int zip(in, out)
int in, out; /* input and output file descriptors */
{
+ char *source_date_epoch;
uch flags = 0; /* general purpose bit flags */
ush attr = 0; /* ascii/binary flag */
ush deflate_flags = 0; /* pkzip -es, -en or -ex equivalent */
@@ -57,7 +59,10 @@ int zip(in, out)
if (time_stamp.tv_nsec < 0)
stamp = 0;
else if (0 < time_stamp.tv_sec && time_stamp.tv_sec <= 0xffffffff)
- stamp = time_stamp.tv_sec;
+ {
+ if ((source_date_epoch = getenv("SOURCE_DATE_EPOCH")) == NULL ||
(stamp = strtol(source_date_epoch, NULL, 10)) <= 0)
+ stamp = time_stamp.tv_sec;
+ }
else
{
/* It's intended that timestamp 0 generates this warning,
--
2.16.4
