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Exports: SOURCE_DATE_EPOCH stands in for the clock, so output repeats

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PNG, PDF, EPS, legacy `.ai`, packaged zips and saved `.vectorcraft` files
record the wall-clock time they were made in, so the same commands run twice
gave different bytes although the pixels matched (#2880):

  PDF   /CreationDate and /ModDate   D:20261018155816 vs D:20261018155817
  PNG   the `Creation Time` tEXt entry
  .vectorcraft  one byte of the stored date
  SVG   carries no time, and already repeated

`metadata::output_time` is the time a file records: `SOURCE_DATE_EPOCH` when it
holds a non-negative whole number of seconds, else the clock, as the
reproducible-builds specification defines it. A date a command is given
(`file.new {created}`, a save's `modified`) still wins over the variable, and a
blank, negative or non-numeric value is ignored so that an export is never
refused over the environment.

`metadata::now_unix` keeps the real clock and now has exactly two callers, both
of which must not be pinnable from the environment: the recovery heartbeat, and
the seed PDF encryption draws on.
This commit is contained in:
Hamza
2026-10-19 00:37:55 +07:00
committed by bflatastic
parent c9a2491ef7
commit 1c80b23745
16 changed files with 88 additions and 15 deletions
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crates/engine/src/cmd/package.rs
+1 -1
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@@ -400,7 +400,7 @@ fn check_no_overwrite(root: &Path, entries: &[Entry], sources: &[&str]) -> Resul
/// The MS-DOS time and date a zip entry records: now (UTC), else 1980-01-01.
fn dos_time() -> (u16, u16) {
let Some(t) = vectorcraft_doc::metadata::now_unix() else { return (0, 0x21) };
let Some(t) = vectorcraft_doc::metadata::output_time() else { return (0, 0x21) };
let [y, mo, d, h, mi, s] = vectorcraft_doc::metadata::civil(t);
let date = (((y - 1980).clamp(0, 127) << 9) | (mo << 5) | d) as u16;
(((h << 11) | (mi << 5) | (s / 2)) as u16, date)