#!/bin/bash

USTD="./ustd/ustd"
LIBINTERFORK="./libinterfork/.libs/libinterfork.so"

BASE_TRACE_DIR="$HOME/.usttraces"

function usage () {
	echo "usage:  $0 COMMAND" 2>/dev/stderr
}

function error() {
	echo "$0: error: $1" 2>/dev/stderr
}

# Prepare vars
CMD=$1

# Validate input
if [ -z "$HOME" ];
then
	error "no home specified"
fi

if [ -z "$CMD" ];
then
	error "no command specified"
	usage;
	exit 1
fi

# Create directory for trace output
DATESTRING="$(hostname)-$(date +%Y%m%d%H%M%S)"
OUTDIR="$BASE_TRACE_DIR/$DATESTRING"
mkdir -p "$OUTDIR"

# Choose socket path
SOCKPATH="/tmp/ust-sock-$$"

# Start daemon
$USTD -s "$SOCKPATH" -o "$OUTDIR" >"$OUTDIR/ustd.log" 2>&1 &
USTDPID=$!

# Establish the environment for the command
export UST_TRACE=1
export UST_AUTOPROBE=1
export UST_DAEMON_SOCKET="$SOCKPATH"

# Execute the command
bash -c "$CMD"

## Because of the keepalive mechanism, we're sure that by the time
## we get here, the daemon is connected to all the buffers that still exist.
## Therefore we can politely ask it to die when it's done.

kill -SIGTERM "$USTDPID"

# Tell the daemon to die
echo "Waiting for ustd to shutdown..."
wait "$USTDPID"