One copy per app: a second is refused and names the running process (X-03)

tests/scripts/one-instance.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# A second ElyDoc is refused; the first keeps its data.
+set -euo pipefail
+
+root=$(cd "$(dirname "$0")/../.." && pwd)
+[ "$(uname)" = Darwin ] || { echo "SKIP: macOS only"; exit 0; }
+work=$(mktemp -d)
+cleanup() {
+  if [ -n "${pid:-}" ]; then
+    # Its worker writes into the folder too.
+    pkill -9 -P "$pid" 2>/dev/null || true
+    kill "$pid" 2>/dev/null || true
+    wait "$pid" 2>/dev/null || true
+  fi
+  rm -rf "$work"
+}
+trap cleanup EXIT
+fail() { echo "FAIL: $*" >&2; exit 1; }
+
+cargo build -q -p ely-lok --bins -p ely-doc --manifest-path "$root/Cargo.toml"
+run() { HOME="$work/home" ELY_LOG=info ELY_LOCALE=en ELY_NO_DIALOG=1 ELY_SMOKE=hold exec "$root/target/debug/ely-doc"; }
+run >"$work/first" 2>&1 &
+pid=$!
+for _ in $(seq 90); do grep -q "lok: first tile drawn" "$work/first" && break; sleep 1; done
+grep -q "lok: first tile drawn" "$work/first" || fail "the first copy did not start: $(tail -5 "$work/first")"
+data="$work/home/Library/Application Support/ElyOffice/ely-doc"
+[ -d "$data/work" ] || fail "no work folder"
+touch "$data/work/kept"
+status=0
+(run) >"$work/second" 2>&1 || status=$?
+[ "$status" != 0 ] || fail "the second copy started"
+grep -q "already running (process $pid)" "$work/second" || fail "the refusal: $(tail -3 "$work/second")"
+[ -e "$data/work/kept" ] || fail "the second copy wiped the first's work folder"
+kill -0 "$pid" || fail "the first copy died"
+echo "ok: a second ElyDoc is refused and the first keeps its data"