8000 Use SOURCE_DATE_EPOCH from environment if present by ksperling-apple · Pull Request #38929 · project-chip/connectedhomeip · GitHub
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Use SOURCE_DATE_EPOCH from environment if present #38929

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Merged
merged 1 commit into from
May 14, 2025
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Use SOURCE_DATE_EPOCH from environment if present #38929

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25 changes: 17 additions & 8 deletions build/chip/write_build_time_header.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,17 +15,18 @@

import argparse
import os
from datetime import datetime, timezone
from time import time

SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))
FALLBACK_LKGT_FILENAME = os.path.abspath(os.path.join(SCRIPT_DIR, 'fallback_last_known_good_time'))

# Offset between the Unix epoch (1970-01-01) and the Matter epoch (2000-01-01)
MATTER_UNIX_EPOCH_OFFSET = 10957 * 24 * 60 * 60 # 10957 days, see src/lib/support/TimeUtils.h

def utc_time_in_matter_epoch_s(time: datetime):
""" Returns the time in matter epoch in s. """
# Matter epoch is 0 hours, 0 minutes, 0 seconds on Jan 1, 2000 UTC
utc_matter = time - datetime(2000, 1, 1, 0, 0, 0, 0, timezone.utc)
return int(utc_matter.total_seconds())

def posix_time_in_matter_epoch_s(posix_epoch_time: int) -> int:
"""Converts a POSIX epoch time to Matter epoch time."""
return posix_epoch_time - MATTER_UNIX_EPOCH_OFFSET


class Options:
Expand All @@ -45,7 +46,7 @@ def write_header(options):

def update_fallback_time_in_file():
with open(FALLBACK_LKGT_FILENAME, "w") as output_file:
output_file.write(str(utc_time_in_matter_epoch_s(datetime.now(tz=timezone.utc))))
output_file.write(str(posix_time_in_matter_epoch_s(int(time()))))


def main():
Expand All @@ -68,11 +69,19 @@ def main():

define_name = 'CHIP_DEVICE_CONFIG_FIRMWARE_BUILD_TIME_MATTER_EPOCH_S'
if cmdline_options.use_current_time:
build_time = utc_time_in_matter_epoch_s(datetime.now(tz=timezone.utc))
build_time = posix_time_in_matter_epoch_s(int(time()))
else:
with open(FALLBACK_LKGT_FILENAME, "r") as input_file:
build_time = int(input_file.read())

# If SOURCE_DATE_EPOCH is set in the environment and is ahead of the fallback time, use it.
# See https://reproducible-builds.org/specs/source-date-epoch/
source_date_epoch = os.environ.get('SOURCE_DATE_EPOCH')
if source_date_epoch is not None:
source_date_time = posix_time_in_matter_epoch_s(int(source_date_epoch))
if source_date_time > build_time:
build_time = source_date_time

opts = Options(output=output,
define_name=define_name,
define_val=str(build_time))
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