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honor SOURCE_DATE_EPOCH variable when timestamping MacBinary files

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Wolfgang Thaller 2024-01-21 11:52:12 +01:00
parent e43fee2701
commit e187bd21c2
1 changed files with 13 additions and 0 deletions
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13
ResourceFiles/ResourceFile.cc
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@ -75,6 +75,19 @@ static void writeMacBinary(std::ostream& out, std::string filename,
const std::string& rsrcBytes = resstream.str();
// MacBinary files contain mandatory timestamps (creation date and modification date)
// We set both of them, but to make reproducible builds possible, this optionally
// takes the time from the $SOURCE_DATE_EPOCH environment variable instead of the system clock.
// When building under `nix`, this is automatically set to the modification date of the newest source
// file.
auto timestamp = std::invoke([&] -> std::chrono::system_clock::time_point {
const char *sourceDateEpochEnvVar = getenv("SOURCE_DATE_EPOCH");
if (sourceDateEpochEnvVar && *sourceDateEpochEnvVar)
return std::chrono::system_clock::from_time_t((time_t)std::atoll(sourceDateEpochEnvVar));
else
return std::chrono::system_clock::now();
});
// Calculate Mac-style timestamp (seconds since 1 January 1904 00:00:00)
std::tm mac_epoch_tm = {
0, 0, 0, // 00:00:00