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Do not add a reference to the session if no session is present.

/* $OpenBSD: cmd-run-shell.c,v 1.61 2020/03/13 06:19:33 nicm Exp $ */

/*
 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
 * Copyright (c) 2009 Nicholas Marriott <nicm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/wait.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Runs a command without a window.
 */

static enum cmd_retval	cmd_run_shell_exec(struct cmd *, struct cmdq_item *);

static void	cmd_run_shell_timer(int, short, void *);
static void	cmd_run_shell_callback(struct job *);
static void	cmd_run_shell_free(void *);
static void	cmd_run_shell_print(struct job *, const char *);

const struct cmd_entry cmd_run_shell_entry = {
	.name = "run-shell",
	.alias = "run",

	.args = { "bd:t:", 0, 1 },
	.usage = "[-b] [-d delay] " CMD_TARGET_PANE_USAGE " [shell-command]",

	.target = { 't', CMD_FIND_PANE, CMD_FIND_CANFAIL },

	.flags = 0,
	.exec = cmd_run_shell_exec
};

struct cmd_run_shell_data {
	char			*cmd;
	char			*cwd;
	struct cmdq_item	*item;
	struct session		*s;
	int			 wp_id;
	struct event		 timer;
};

static void
cmd_run_shell_print(struct job *job, const char *msg)
{
	struct cmd_run_shell_data	*cdata = job_get_data(job);
	struct window_pane		*wp = NULL;
	struct cmd_find_state		 fs;
	struct window_mode_entry	*wme;

	if (cdata->wp_id != -1)
		wp = window_pane_find_by_id(cdata->wp_id);
	if (wp == NULL) {
		if (cdata->item != NULL) {
			cmdq_print(cdata->item, "%s", msg);
			return;
		}
		if (cmd_find_from_nothing(&fs, 0) != 0)
			return;
		wp = fs.wp;
		if (wp == NULL)
			return;
	}

	wme = TAILQ_FIRST(&wp->modes);
	if (wme == NULL || wme->mode != &window_view_mode)
		window_pane_set_mode(wp, &window_view_mode, NULL, NULL);
	window_copy_add(wp, "%s", msg);
}

static enum cmd_retval
cmd_run_shell_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args			*args = self->args;
	struct cmd_run_shell_data	*cdata;
	struct client			*c = cmd_find_client(item, NULL, 1);
	struct session			*s = item->target.s;
	struct winlink			*wl = item->target.wl;
	struct window_pane		*wp = item->target.wp;
	const char			*delay;
	double				 d;
	struct timeval			 tv;
	char				*end;

	cdata = xcalloc(1, sizeof *cdata);
	if (args->argc != 0)
		cdata->cmd = format_single(item, args->argv[0], c, s, wl, wp);

	if (args_has(args, 't') && wp != NULL)
		cdata->wp_id = wp->id;
	else
		cdata->wp_id = -1;

	if (!args_has(args, 'b'))
		cdata->item = item;

	cdata->cwd = xstrdup(server_client_get_cwd(item->client, s));
	cdata->s = s;
	if (s != NULL)
		session_add_ref(s, __func__);

	evtimer_set(&cdata->timer, cmd_run_shell_timer, cdata);

	if ((delay = args_get(args, 'd')) != NULL) {
		d = strtod(delay, &end);
		if (*end != '\0') {
			cmdq_error(item, "invalid delay time: %s", delay);
			cmd_run_shell_free(cdata);
			return (CMD_RETURN_ERROR);
		}
		timerclear(&tv);
		tv.tv_sec = (time_t)d;
		tv.tv_usec = (d - (double)tv.tv_sec) * 1000000U;
		evtimer_add(&cdata->timer, &tv);
	} else
		cmd_run_shell_timer(-1, 0, cdata);

	if (args_has(args, 'b'))
		return (CMD_RETURN_NORMAL);
	return (CMD_RETURN_WAIT);
}

static void
cmd_run_shell_timer(__unused int fd, __unused short events, void* arg)
{
	struct cmd_run_shell_data	*cdata = arg;

	if (cdata->cmd != NULL) {
		if (job_run(cdata->cmd, cdata->s, cdata->cwd, NULL,
		    cmd_run_shell_callback, cmd_run_shell_free, cdata,
		    0) == NULL)
			cmd_run_shell_free(cdata);
	} else {
		if (cdata->item != NULL)
			cmdq_continue(cdata->item);
		cmd_run_shell_free(cdata);
	}
}

static void
cmd_run_shell_callback(struct job *job)
{
	struct cmd_run_shell_data	*cdata = job_get_data(job);
	struct bufferevent		*event = job_get_event(job);
	char				*cmd = cdata->cmd, *msg = NULL, *line;
	size_t				 size;
	int				 retcode, status;

	do {
		if ((line = evbuffer_readline(event->input)) != NULL) {
			cmd_run_shell_print(job, line);
			free(line);
		}
	} while (line != NULL);

	size = EVBUFFER_LENGTH(event->input);
	if (size != 0) {
		line = xmalloc(size + 1);
		memcpy(line, EVBUFFER_DATA(event->input), size);
		line[size] = '\0';

		cmd_run_shell_print(job, line);

		free(line);
	}

	status = job_get_status(job);
	if (WIFEXITED(status)) {
		if ((retcode = WEXITSTATUS(status)) != 0)
			xasprintf(&msg, "'%s' returned %d", cmd, retcode);
	} else if (WIFSIGNALED(status)) {
		retcode = WTERMSIG(status);
		xasprintf(&msg, "'%s' terminated by signal %d", cmd, retcode);
	}
	if (msg != NULL)
		cmd_run_shell_print(job, msg);
	free(msg);

	if (cdata->item != NULL)
		cmdq_continue(cdata->item);
}

static void
cmd_run_shell_free(void *data)
{
	struct cmd_run_shell_data	*cdata = data;

	evtimer_del(&cdata->timer);
	if (cdata->s != NULL)
		session_remove_ref(cdata->s, __func__);
	free(cdata->cwd);
	free(cdata->cmd);
	free(cdata);
}