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-rw-r--r--package/utils/busybox/Makefile4
-rw-r--r--package/utils/busybox/patches/530-use-SOURCE_DATE_EPOCH-for-timestamp-if-available.patch80
2 files changed, 80 insertions, 4 deletions
diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile
index 242a2428ac..e4e176870c 100644
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -81,10 +81,6 @@ endef
Package/busybox-selinux/conffiles = $(Package/busybox/conffiles)
endif
-# don't create a version string containing the actual timestamp
-export KCONFIG_NOTIMESTAMP=1
-
-
ifndef CONFIG_USE_MUSL
LDLIBS:=m crypt
endif
diff --git a/package/utils/busybox/patches/530-use-SOURCE_DATE_EPOCH-for-timestamp-if-available.patch b/package/utils/busybox/patches/530-use-SOURCE_DATE_EPOCH-for-timestamp-if-available.patch
new file mode 100644
index 0000000000..af473622ed
--- /dev/null
+++ b/package/utils/busybox/patches/530-use-SOURCE_DATE_EPOCH-for-timestamp-if-available.patch
@@ -0,0 +1,80 @@
+From 59f773ee81a8945321f4aa20abc5e9577e6483e4 Mon Sep 17 00:00:00 2001
+From: Paul Spooren <mail@aparcar.org>
+Date: Thu, 13 May 2021 11:25:34 +0200
+Subject: [PATCH] use SOURCE_DATE_EPOCH for timestamp if available
+
+The SOURCE_DATE_EPOCH is an effort of the Reproducible Builds
+organization to make timestamps/build dates in compiled tools
+deterministic over several repetitive builds.
+
+Busybox shows by default the build date timestamp which changes whenever
+compiled. To have a reasonable accurate build date while staying
+reproducible, it's possible to use the *date of last source
+modification* rather than the current time and date.
+
+Further information on SOURCE_DATE_EPOCH are available online [1].
+
+This patch modifies `confdata.c` so that the content of the
+SOURCE_DATE_EPOCH env variable is used as timestamp.
+
+To be independent of different timezones between builds, whenever
+SOURCE_DATE_EPOCH is defined the GMT time is used.
+
+[1]: https://reproducible-builds.org/docs/source-date-epoch/
+
+Signed-off-by: Paul Spooren <mail@aparcar.org>
+---
+ scripts/kconfig/confdata.c | 17 ++++++++++++++---
+ 1 file changed, 14 insertions(+), 3 deletions(-)
+
+diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
+index b05b96e45..73c25e3a8 100644
+--- a/scripts/kconfig/confdata.c
++++ b/scripts/kconfig/confdata.c
+@@ -342,6 +342,8 @@ int conf_write(const char *name)
+ time_t now;
+ int use_timestamp = 1;
+ char *env;
++ char *source_date_epoch;
++ struct tm *build_time;
+
+ dirname[0] = 0;
+ if (name && name[0]) {
+@@ -378,7 +380,16 @@ int conf_write(const char *name)
+ }
+ sym = sym_lookup("KERNELVERSION", 0);
+ sym_calc_value(sym);
+- time(&now);
++
++ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
++ if (source_date_epoch && *source_date_epoch) {
++ now = strtoull(source_date_epoch, NULL, 10);
++ build_time = gmtime(&now);
++ } else {
++ time(&now);
++ build_time = localtime(&now);
++ }
++
+ env = getenv("KCONFIG_NOTIMESTAMP");
+ if (env && *env)
+ use_timestamp = 0;
+@@ -398,14 +409,14 @@ int conf_write(const char *name)
+ if (use_timestamp) {
+ size_t ret = \
+ strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
+- "\"%Y-%m-%d %H:%M:%S %Z\"\n", localtime(&now));
++ "\"%Y-%m-%d %H:%M:%S %Z\"\n", build_time);
+ /* if user has Factory timezone or some other odd install, the
+ * %Z above will overflow the string leaving us with undefined
+ * results ... so let's try again without the timezone.
+ */
+ if (ret == 0)
+ strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
+- "\"%Y-%m-%d %H:%M:%S\"\n", localtime(&now));
++ "\"%Y-%m-%d %H:%M:%S\"\n", build_time);
+ } else { /* bbox */
+ strcpy(buf, "#define AUTOCONF_TIMESTAMP \"\"\n");
+ }
+--
+2.30.2
+