`marmot message react "$gid" "$id" "🍕"` was producing a kind:7 whose
inner content was four `U+FFFD` replacement characters instead of the
emoji. Whitenoise's `message_aggregator::emoji_utils` rejected it with
`Invalid reaction content: ����`, and the openmls receiver retried the
event ten times before giving up — by which point the secret tree had
already consumed that generation, so the retry surfaced as a confusing
`Ciphertext generation out of bounds 1 / SecretReuseError`. That last
error was a downstream symptom; the root cause is argv decoding.
Why it happens: JEP 400 (Java 18+) pins `file.encoding` to UTF-8 but
deliberately leaves `sun.jnu.encoding` — the encoding the JVM uses to
decode argv, filenames, and native interop strings — tied to the OS
locale, and `sun.jnu.encoding` is read **before** the JVM parses any
`-D` flag, so it can't be overridden via `applicationDefaultJvmArgs`.
Under POSIX/C locales (no `LANG`/`LC_ALL` set, common on CI runners
and stripped-down containers) `sun.jnu.encoding` ends up at
`ANSI_X3.4-1968` — i.e. ASCII — and every byte > 0x7F in argv lands
as `U+FFFD` before our code ever sees it. The four UTF-8 bytes of 🍕
(F0 9F 8D 95) become four replacement chars, get signed into the kind:7
content, and the test fails on receipt.
The only place we can set the encoding from is the launching shell.
Patch the gradle-generated start scripts (POSIX `amy`, Windows
`amy.bat`) right after `:cli:startScripts`:
* POSIX: if neither `LANG` nor `LC_ALL` is set, `export LANG=C.UTF-8`
before invoking Java. Existing locale settings are respected.
* Windows: `chcp 65001` to switch the console to UTF-8 before Java
runs.
Tested manually: with `LANG=` (sandbox default) `amy` previously sent
`argv[0]=????` for an emoji argument; with the patch it sends `🍕` and
`sun.jnu.encoding=UTF-8`, and whitenoise accepts the kind:7 reaction.
The interop test 09 polling also needed a fix unrelated to the
encoding bug: wn aggregates kind:7 reactions onto the anchor message
under `.reactions.by_emoji.<emoji>` instead of surfacing them as
standalone messages whose `.content` is the emoji, so the previous
`wait_for_message B "$mls_gid" "🍕"` would have failed even with a
correctly-decoded reaction. The new poll inspects each message's
`.reactions.by_emoji` keys for the emoji literal.
Marmot interop score: 15/16 → **16/16** 🎉https://claude.ai/code/session_013VYkpz8P1mPh9Ejxy9anhJ
Claude
fc99bed55a