Scripts fail on Windows under WSL; SSE parser drops output on Git Bash & WSL

[mike-thompson-day8]

Two related bugs hit users on Windows-hosted bash environments where marimo runs natively on Windows but the agent scripts run under a non-MSYS bash. Both come from scripts/discover-servers.sh and scripts/execute-code.sh assuming a POSIX shell on a POSIX OS.

Bug 1 — discovery picks the wrong registry path under WSL

Both scripts gate Windows-style location lookup on OSTYPE:

if [[ "$OSTYPE" == msys* || "$OSTYPE" == cygwin* ]]; then
  servers_dir="$HOME/.marimo/servers"
else
  servers_dir="${XDG_STATE_HOME:-$HOME/.local/state}/marimo/servers"
fi

Under WSL pointed at a Windows-native marimo install, OSTYPE=linux-gnu, so the script reads ~/.local/state/marimo/servers and never sees the real registry at $USERPROFILE\.marimo\servers.

Reproducer:

• Marimo running natively on Windows with --no-token; registry file present at C:\Users\<u>\.marimo\servers\127.0.0.1_2718.json.
• curl http://127.0.0.1:2718/api/sessions from inside WSL shows the live session.
• bash scripts/discover-servers.sh returns [].

Bug 2 — SSE parser silently drops every event on Windows

execute-code.sh reads the event stream with IFS= read -r line and matches event: / data: literally:

while IFS= read -r line && [[ "$done_received" == false ]]; do
  case "$line" in
    event:*) current_event=\"\${line#event: }\" ;;
    data:*)  ...
  esac
done < <(curl -sN ...)

marimo's HTTP server emits CRLF terminators (per the SSE spec). read -r only strips the LF, so the trailing \r keeps every literal-prefix pattern from matching on Git Bash and WSL. Result: stdout / stderr / done events are all dropped — the user sees no output even though the code ran.

Reproducer:

• bash scripts/execute-code.sh --url http://127.0.0.1:2718 --session <id> -c \"print(1 + 1)\" prints nothing.
• Same POST via curl.exe returns the expected event: stdout\ndata: {\"data\":\"2\n\"}.

Suggested fix

PR coming separately:

• For (1): probe a candidate list — XDG path, ~/.marimo/servers, and (if $USERPROFILE is set) a wslpath/cygpath translation of it — and pick the first directory that has registry files. Infer the "is Windows-native registry?" liveness-probe choice from the chosen path (e.g. */.marimo/servers), not from OSTYPE.
• For (2): one-line line=\"\${line%$'\r'}\" immediately after the read. Cheap to do unconditionally.

Tested both fixes on Windows 11 / Git Bash with a live marimo session.