From 90f881acdaf41b083922bb7ff3c9787d2182de93 Mon Sep 17 00:00:00 2001 From: C Freeman Date: Tue, 17 Oct 2023 14:01:00 -0400 Subject: [PATCH] Put the firmware build time update behind a build flag (#29691) * Add build flag for changing firmware build time Adding a default fallback firmware build time. This makes the firmware build more consistent, so you get the same binary unless you specifically ask for the build time to be updated. * Get fallback from from file so it can be updated This lets us update the fallback time via a script using a cron job if we want to. * Restyled by isort * Change filename --------- Co-authored-by: Restyled.io --- build/chip/fallback_last_known_good_time | 1 + build/chip/write_build_time_header.py | 50 +++++++++++++++++------- src/credentials/BUILD.gn | 4 ++ 3 files changed, 40 insertions(+), 15 deletions(-) create mode 100644 build/chip/fallback_last_known_good_time diff --git a/build/chip/fallback_last_known_good_time b/build/chip/fallback_last_known_good_time new file mode 100644 index 00000000000000..2a9cae328a14db --- /dev/null +++ b/build/chip/fallback_last_known_good_time @@ -0,0 +1 @@ +750561408 \ No newline at end of file diff --git a/build/chip/write_build_time_header.py b/build/chip/write_build_time_header.py index 7b421f19844c17..fbd8f87ce84d4b 100755 --- a/build/chip/write_build_time_header.py +++ b/build/chip/write_build_time_header.py @@ -17,11 +17,14 @@ import os from datetime import datetime, timezone +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')) -def utc_time_in_matter_epoch_s(): + +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 = datetime.now(tz=timezone.utc) - datetime(2000, 1, 1, 0, 0, 0, 0, timezone.utc) + utc_matter = time - datetime(2000, 1, 1, 0, 0, 0, 0, timezone.utc) return int(utc_matter.total_seconds()) @@ -32,31 +35,48 @@ def __init__(self, output, define_name, define_val): self.define_val = define_val -def GetOptions(): +def write_header(options): + with open(options.output, "w") as output_file: + output_file.write("// Generated by write_build_time_header.py\n") + output_file.write('#pragma once\n\n') + + output_file.write(f'#define {options.define_name} {options.define_val}\n') + + +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)))) + + +def main(): parser = argparse.ArgumentParser() parser.add_argument('--output', help="Output header name (inside gen dir)") parser.add_argument('--gen-dir', help="Path to root of generated file directory tree.") + parser.add_argument('--use-current-time', default=False, action='store_true', + help="Set the LKGT to the current time. If this flag is not used, the LKGT is set to a hardcoded time.") + parser.add_argument('--update-fallback-time-in-file', default=False, action='store_true', + help='Write the current UTC time out to the fallback file') cmdline_options = parser.parse_args() + if cmdline_options.update_fallback_time_in_file: + update_fallback_time_in_file() + return + # The actual output file is inside the gen dir. output = os.path.join(cmdline_options.gen_dir, cmdline_options.output) define_name = 'CHIP_DEVICE_CONFIG_FIRMWARE_BUILD_TIME_MATTER_EPOCH_S' - build_time = utc_time_in_matter_epoch_s() + if cmdline_options.use_current_time: + build_time = utc_time_in_matter_epoch_s(datetime.now(tz=timezone.utc)) + else: + with open(FALLBACK_LKGT_FILENAME, "r") as input_file: + build_time = int(input_file.read()) - return Options(output=output, + opts = Options(output=output, define_name=define_name, define_val=str(build_time)) + write_header(opts) -def WriteHeader(options): - with open(options.output, "w") as output_file: - output_file.write("// Generated by write_build_time_header.py\n") - output_file.write('#pragma once\n\n') - - output_file.write(f'#define {options.define_name} {options.define_val}\n') - - -options = GetOptions() -WriteHeader(options) +main() diff --git a/src/credentials/BUILD.gn b/src/credentials/BUILD.gn index 4e4cb93fe9965c..0e23eb497cf702 100644 --- a/src/credentials/BUILD.gn +++ b/src/credentials/BUILD.gn @@ -20,6 +20,7 @@ import("${chip_root}/src/platform/device.gni") declare_args() { chip_build_example_creds = true + update_last_known_good_time = false } action("gen_build_time_header") { @@ -35,6 +36,9 @@ action("gen_build_time_header") { "--gen-dir", rebase_path(include_dir, root_build_dir), ] + if (update_last_known_good_time) { + args += [ "--use-current-time" ] + } visibility = [ ":build_time_header" ] }