81 lines
2.7 KiB
Diff
81 lines
2.7 KiB
Diff
From 59f773ee81a8945321f4aa20abc5e9577e6483e4 Mon Sep 17 00:00:00 2001
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From: Paul Spooren <mail@aparcar.org>
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Date: Thu, 13 May 2021 11:25:34 +0200
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Subject: [PATCH] use SOURCE_DATE_EPOCH for timestamp if available
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The SOURCE_DATE_EPOCH is an effort of the Reproducible Builds
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organization to make timestamps/build dates in compiled tools
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deterministic over several repetitive builds.
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Busybox shows by default the build date timestamp which changes whenever
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compiled. To have a reasonable accurate build date while staying
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reproducible, it's possible to use the *date of last source
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modification* rather than the current time and date.
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Further information on SOURCE_DATE_EPOCH are available online [1].
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This patch modifies `confdata.c` so that the content of the
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SOURCE_DATE_EPOCH env variable is used as timestamp.
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To be independent of different timezones between builds, whenever
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SOURCE_DATE_EPOCH is defined the GMT time is used.
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[1]: https://reproducible-builds.org/docs/source-date-epoch/
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Signed-off-by: Paul Spooren <mail@aparcar.org>
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---
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scripts/kconfig/confdata.c | 17 ++++++++++++++---
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1 file changed, 14 insertions(+), 3 deletions(-)
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diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
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index b05b96e45..73c25e3a8 100644
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--- a/scripts/kconfig/confdata.c
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+++ b/scripts/kconfig/confdata.c
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@@ -342,6 +342,8 @@ int conf_write(const char *name)
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time_t now;
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int use_timestamp = 1;
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char *env;
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+ char *source_date_epoch;
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+ struct tm *build_time;
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dirname[0] = 0;
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if (name && name[0]) {
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@@ -378,7 +380,16 @@ int conf_write(const char *name)
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}
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sym = sym_lookup("KERNELVERSION", 0);
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sym_calc_value(sym);
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- time(&now);
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+
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+ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
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+ if (source_date_epoch && *source_date_epoch) {
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+ now = strtoull(source_date_epoch, NULL, 10);
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+ build_time = gmtime(&now);
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+ } else {
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+ time(&now);
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+ build_time = localtime(&now);
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+ }
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+
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env = getenv("KCONFIG_NOTIMESTAMP");
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if (env && *env)
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use_timestamp = 0;
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@@ -398,14 +409,14 @@ int conf_write(const char *name)
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if (use_timestamp) {
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size_t ret = \
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strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
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- "\"%Y-%m-%d %H:%M:%S %Z\"\n", localtime(&now));
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+ "\"%Y-%m-%d %H:%M:%S %Z\"\n", build_time);
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/* if user has Factory timezone or some other odd install, the
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* %Z above will overflow the string leaving us with undefined
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* results ... so let's try again without the timezone.
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*/
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if (ret == 0)
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strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
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- "\"%Y-%m-%d %H:%M:%S\"\n", localtime(&now));
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+ "\"%Y-%m-%d %H:%M:%S\"\n", build_time);
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} else { /* bbox */
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strcpy(buf, "#define AUTOCONF_TIMESTAMP \"\"\n");
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}
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--
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2.30.2
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