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#!/usr/bin/env bash
# One-tape wrapper: starts the background workload, runs vhs <tape>, kills the
# workload. Tapes themselves don't need to know about the workload — they just
# launch ior and drive the TUI.
#
# vhs is invoked with cwd set to the repo root, so all paths inside tapes
# (Output, Screenshot, the ./ior binary) are repo-relative.
#
# Usage: run-tape.sh <path-to-tape>
set -euo pipefail
if [ $# -ne 1 ]; then
echo "usage: $0 <tape-file>" >&2
exit 2
fi
TAPE="$(realpath "$1")"
ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
WORKLOAD="${ROOT}/demo/scripts/workload.sh"
if [ ! -f "$TAPE" ]; then
echo "tape not found: $TAPE" >&2
exit 2
fi
# Pre-flight: vhs and ttyd must be on PATH; sudo timestamp must be live.
command -v vhs >/dev/null || { echo "vhs not on PATH (run: mage installDemoTools)" >&2; exit 3; }
command -v ttyd >/dev/null || { echo "ttyd not on PATH (run: mage installDemoTools)" >&2; exit 3; }
sudo -n true 2>/dev/null || { echo "sudo timestamp expired (run: sudo -v)" >&2; exit 4; }
# Start workload in its own session/process group so we can kill the whole tree.
setsid "$WORKLOAD" </dev/null >/dev/null 2>&1 &
WL_PID=$!
cleanup() {
if kill -0 "$WL_PID" 2>/dev/null; then
# The workload runs `setsid` so its PID == its PGID.
kill -TERM -- "-$WL_PID" 2>/dev/null || true
sleep 0.5
kill -KILL -- "-$WL_PID" 2>/dev/null || true
fi
# Best-effort: stop any straggling ior processes from this tape.
sudo -n pkill -TERM -f '/ior$' 2>/dev/null || true
}
trap cleanup EXIT INT TERM
# Give the workload a moment to spool up before recording.
sleep 2
cd "$ROOT"
vhs "$TAPE"
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