new file mode 100644
@@ -0,0 +1,158 @@
+From 8da7bc93315cb0c32ad868f17808468b81fa76ec Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Bj=C3=B8rn=20Forsman?= <bjorn.forsman@gmail.com>
+Date: Wed, 5 Dec 2018 19:52:51 +0100
+Subject: [PATCH] Honor the SOURCE_DATE_EPOCH variable
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Implement the SOURCE_DATE_EPOCH specification[1] for reproducible
+builds. If SOURCE_DATE_EPOCH is set, use it as timestamp instead of the
+current time.
+
+[1] https://reproducible-builds.org/specs/source-date-epoch/
+
+Upstream-Status: Backport [https://github.com/dosfstools/dosfstools/commit/8da7bc93315cb0c32ad868f17808468b81fa76ec]
+Signed-off-by: Bjørn Forsman <bjorn.forsman@gmail.com>
+---
+ src/boot.c | 23 +++++++++++++++++++++--
+ src/common.c | 18 ++++++++++++++++--
+ src/mkfs.fat.c | 19 ++++++++++++++++---
+ 3 files changed, 53 insertions(+), 7 deletions(-)
+
+diff --git a/src/boot.c b/src/boot.c
+index 4de450d..8f78e1c 100644
+--- a/src/boot.c
++++ b/src/boot.c
+@@ -33,6 +33,8 @@
+ #include <stdlib.h>
+ #include <sys/types.h>
+ #include <time.h>
++#include <errno.h>
++#include <ctype.h>
+
+ #include "common.h"
+ #include "fsck.fat.h"
+@@ -672,6 +674,7 @@ void write_volume_label(DOS_FS * fs, char *label)
+ {
+ time_t now;
+ struct tm *mtime;
++ char *source_date_epoch = NULL;
+ off_t offset;
+ int created;
+ DIR_ENT de;
+@@ -687,8 +690,24 @@ void write_volume_label(DOS_FS * fs, char *label)
+ if (de.name[0] == 0xe5)
+ de.name[0] = 0x05;
+
+- now = time(NULL);
+- mtime = (now != (time_t)-1) ? localtime(&now) : NULL;
++ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
++ if (source_date_epoch) {
++ char *tmp = NULL;
++ long long conversion = 0;
++ errno = 0;
++ conversion = strtoll(source_date_epoch, &tmp, 10);
++ now = conversion;
++ if (!isdigit((unsigned char)*source_date_epoch) || *tmp != '\0'
++ || errno != 0 || (long long)now != conversion) {
++ die("SOURCE_DATE_EPOCH is too big or contains non-digits: \"%s\"",
++ source_date_epoch);
++ }
++ mtime = gmtime(&now);
++ } else {
++ now = time(NULL);
++ mtime = (now != (time_t)-1) ? localtime(&now) : NULL;
++ }
++
+ if (mtime && mtime->tm_year >= 80 && mtime->tm_year <= 207) {
+ de.time = htole16((unsigned short)((mtime->tm_sec >> 1) +
+ (mtime->tm_min << 5) +
+diff --git a/src/common.c b/src/common.c
+index 6a2e396..4f1afcb 100644
+--- a/src/common.c
++++ b/src/common.c
+@@ -30,6 +30,7 @@
+ #include <string.h>
+ #include <stdarg.h>
+ #include <errno.h>
++#include <ctype.h>
+ #include <wctype.h>
+ #include <termios.h>
+ #include <sys/time.h>
+@@ -298,8 +299,21 @@ void check_atari(void)
+ uint32_t generate_volume_id(void)
+ {
+ struct timeval now;
+-
+- if (gettimeofday(&now, NULL) != 0 || now.tv_sec == (time_t)-1 || now.tv_sec < 0) {
++ char *source_date_epoch = NULL;
++
++ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
++ if (source_date_epoch) {
++ char *tmp = NULL;
++ long long conversion = 0;
++ errno = 0;
++ conversion = strtoll(source_date_epoch, &tmp, 10);
++ if (!isdigit((unsigned char)*source_date_epoch) || *tmp != '\0'
++ || errno != 0) {
++ die("SOURCE_DATE_EPOCH is too big or contains non-digits: \"%s\"",
++ source_date_epoch);
++ }
++ return (uint32_t)conversion;
++ } else if (gettimeofday(&now, NULL) != 0 || now.tv_sec == (time_t)-1 || now.tv_sec < 0) {
+ srand(getpid());
+ /* rand() returns int from [0,RAND_MAX], therefore only 31 bits */
+ return (((uint32_t)(rand() & 0xFFFF)) << 16) | ((uint32_t)(rand() & 0xFFFF));
+diff --git a/src/mkfs.fat.c b/src/mkfs.fat.c
+index 37fc8ff..1948635 100644
+--- a/src/mkfs.fat.c
++++ b/src/mkfs.fat.c
+@@ -1074,7 +1074,7 @@ static void setup_tables(void)
+ }
+
+ /* If is not available then generate random 32 bit disk signature */
+- if (invariant)
++ if (invariant || getenv("SOURCE_DATE_EPOCH"))
+ disk_sig = volume_id;
+ else if (!disk_sig)
+ disk_sig = generate_volume_id();
+@@ -1287,7 +1287,7 @@ static void setup_tables(void)
+ de->name[0] = 0x05;
+ de->attr = ATTR_VOLUME;
+ if (create_time != (time_t)-1) {
+- if (!invariant)
++ if (!invariant && !getenv("SOURCE_DATE_EPOCH"))
+ ctime = localtime(&create_time);
+ else
+ ctime = gmtime(&create_time);
+@@ -1477,6 +1477,7 @@ int main(int argc, char **argv)
+ int blocks_specified = 0;
+ struct timeval create_timeval;
+ long long conversion;
++ char *source_date_epoch = NULL;
+
+ enum {OPT_HELP=1000, OPT_INVARIANT, OPT_MBR, OPT_VARIANT, OPT_CODEPAGE, OPT_OFFSET};
+ const struct option long_options[] = {
+@@ -1497,8 +1498,20 @@ int main(int argc, char **argv)
+ program_name = p + 1;
+ }
+
+- if (gettimeofday(&create_timeval, NULL) == 0 && create_timeval.tv_sec != (time_t)-1)
++ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
++ if (source_date_epoch) {
++ errno = 0;
++ conversion = strtoll(source_date_epoch, &tmp, 10);
++ create_time = conversion;
++ if (!isdigit((unsigned char)*source_date_epoch) || *tmp != '\0'
++ || errno != 0 || (long long)create_time != conversion) {
++ die("SOURCE_DATE_EPOCH is too big or contains non-digits: \"%s\"",
++ source_date_epoch);
++ }
++ } else if (gettimeofday(&create_timeval, NULL) == 0 && create_timeval.tv_sec != (time_t)-1) {
+ create_time = create_timeval.tv_sec;
++ }
++
+ volume_id = generate_volume_id();
+ check_atari();
+
@@ -13,6 +13,8 @@ SRC_URI = "${GITHUB_BASE_URI}/download/v${PV}/${BP}.tar.gz \
"
SRC_URI[sha256sum] = "64926eebf90092dca21b14259a5301b7b98e7b1943e8a201c7d726084809b527"
+SRC_URI += "file://source-date-epoch.patch"
+
inherit autotools gettext pkgconfig update-alternatives github-releases
EXTRA_OECONF = "--enable-compat-symlinks --without-iconv"