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