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42 lines
1.2 KiB
Diff
42 lines
1.2 KiB
Diff
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From 501ae4e93fd6fa2f7d20d00d1b011f9006802eae Mon Sep 17 00:00:00 2001
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From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
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Date: Fri, 3 May 2019 16:32:24 +0200
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Subject: [PATCH] Override mtime with zip -X
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with SOURCE_DATE_EPOCH
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to allow for reproducible builds of .zip files
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See https://reproducible-builds.org/ for why this is good
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and https://reproducible-builds.org/specs/source-date-epoch/
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for the definition of this variable.
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Uses clamping to keep older mtimes than SOURCE_DATE_EPOCH intact.
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---
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zipup.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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--- a/zipup.c
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+++ b/zipup.c
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@@ -414,6 +414,7 @@ struct zlist far *z; /* zip entry to
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ush tempcext = 0;
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char *tempextra = NULL;
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char *tempcextra = NULL;
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+ const char *source_date_epoch;
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#ifdef WINDLL
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@@ -674,6 +675,13 @@ struct zlist far *z; /* zip entry to
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} /* strcmp(z->name, "-") == 0 */
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+ if (extra_fields == 0 && (source_date_epoch = getenv("SOURCE_DATE_EPOCH")) != NULL) {
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+ time_t epoch = strtoull(source_date_epoch, NULL, 10);
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+ if (epoch > 0) {
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+ ulg epochtim = unix2dostime(&epoch);
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+ if (z->tim > epochtim) z->tim = epochtim;
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+ }
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+ }
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if (extra_fields == 2) {
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unsigned len;
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char *p;
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