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firmware-utils: mkdlinkfw: create reproducible header

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Use the SOURCE_DATE_EPOCH environment variable if set instead of the
current time. The used timestamp matches the timestamp of the latest
commit this way and make the images reproducible.

Signed-off-by: Mathias Kresin <dev@kresin.me>
This commit is contained in:
Mathias Kresin 2019-01-05 07:34:02 +01:00
parent f4aa9d8839
commit e428b127e7
1 changed files with 18 additions and 3 deletions
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21
tools/firmware-utils/src/mkdlinkfw-lib.c
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@ -34,9 +34,24 @@ extern char *progname;
uint32_t jboot_timestamp(void)
{
time_t rawtime;
time(&rawtime);
return (((uint32_t) rawtime) - TIMESTAMP_MAGIC) >> 2;
char *env = getenv("SOURCE_DATE_EPOCH");
char *endptr = env;
time_t fixed_timestamp = -1;
errno = 0;
if (env && *env) {
fixed_timestamp = strtoull(env, &endptr, 10);
if (errno || (endptr && *endptr != '\0')) {
fprintf(stderr, "Invalid SOURCE_DATE_EPOCH");
fixed_timestamp = -1;
}
}
if (fixed_timestamp == -1)
time(&fixed_timestamp);
return (((uint32_t) fixed_timestamp) - TIMESTAMP_MAGIC) >> 2;
}
uint16_t jboot_checksum(uint16_t start_val, uint16_t *data, int size)