finit/conf.c

/* Parser for finit.conf
 *
 * Copyright (c) 2012  Joachim Nilsson <troglobit@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <ctype.h>
#include <string.h>

#include "finit.h"
#include "svc.h"
#include "lite.h"
#include "helpers.h"

#define MATCH_CMD(l, c, x) \
	(!strncmp(l, c, strlen(c)) && (x = (l) + strlen(c)))

static char *strip_line(char *line)
{
	char *ptr;

	/* Trim leading whitespace */
	while (*line && isblank(*line))
		line++;

	/* Strip any comment at end of line */
	ptr = line;
	while (*ptr && *ptr != '#')
		ptr++;
	*ptr = 0;

	return line;
}

void parse_finit_conf(char *file)
{
	FILE *fp;
	char line[LINE_SIZE];
	char cmd[CMD_SIZE];

	username = strdup(DEFUSER);
	hostname = strdup(DEFHOST);
	rcsd     = strdup(FINIT_RCSD);

	if ((fp = fopen(file, "r")) != NULL) {
		char *x;
		const char *err = NULL;

		_d("Parse %s ...", file);
		while (!feof(fp)) {
			if (!fgets(line, sizeof(line), fp))
				continue;

			_d("conf: %s", line);
			chomp(line);

			/* Skip comments. */
			if (MATCH_CMD(line, "#", x))
				continue;

			/* Do this before mounting / read-write
			 * XXX: Move to plugin which checks /etc/fstab instead */
			if (MATCH_CMD(line, "check ", x)) {
				char *dev = strip_line(x);

				strcpy(cmd, "/sbin/fsck -C -a ");
				strlcat(cmd, dev, sizeof(cmd));
				run_interactive(cmd, "Checking file system %s", dev);

				continue;
			}

			if (MATCH_CMD(line, "user ", x)) {
				if (username) free(username);
				username = strdup(strip_line(x));
				continue;
			}
			if (MATCH_CMD(line, "host ", x)) {
				if (hostname) free(hostname);
				hostname = strdup(strip_line(x));
				continue;
			}

			if (MATCH_CMD(line, "module ", x)) {
				char *mod = strip_line(x);

				strcpy(cmd, "/sbin/modprobe ");
				strlcat(cmd, mod, sizeof(cmd));
				run_interactive(cmd, "Loading kernel module %s", mod);

				continue;
			}
			if (MATCH_CMD(line, "mknod ", x)) {
				char *dev = strip_line(x);

				strcpy(cmd, "/bin/mknod ");
				strlcat(cmd, dev, sizeof(cmd));
				run_interactive(cmd, "Creating device node %s", dev);

				continue;
			}

			if (MATCH_CMD(line, "network ", x)) {
				if (network) free(network);
				network = strdup(strip_line(x));
				continue;
			}
			if (MATCH_CMD(line, "runparts ", x)) {
				if (rcsd) free(rcsd);
				rcsd = strdup(strip_line(x));
				continue;
			}
			if (MATCH_CMD(line, "startx ", x)) {
				svc_register(SVC_CMD_SERVICE, strip_line(x), username);
				continue;
			}
			if (MATCH_CMD(line, "shutdown ", x)) {
				if (sdown) free(sdown);
				sdown = strdup(strip_line(x));
				continue;
			}

			/* The desired runlevel to start when leaving
			 * bootstrap (S).  Finit supports 1-9, but most
			 * systems only use 1-6, where 6 is reserved for
			 * reboot */
			if (MATCH_CMD(line, "runlevel ", x)) {
				char *token = strip_line(x);

				cfglevel = strtonum(token, 1, 9, &err);
				if (err)
					cfglevel = RUNLEVEL;
				if (cfglevel < 1 || cfglevel > 9 || cfglevel == 6)
					cfglevel = 2; /* Fallback */
				continue;
			}

			/* Monitored daemon, will be respawned on exit, as
			 * long as the (optional) service callback returns
			 * non-zero */
			if (MATCH_CMD(line, "service ", x)) {
				svc_register(SVC_CMD_SERVICE, x, NULL);
				continue;
			}

			/* One-shot task, will not be respawned. Only runs if
			 * the (optional) service callback returns true */
			if (MATCH_CMD(line, "task ", x)) {
				svc_register(SVC_CMD_TASK, x, NULL);
				continue;
			}

			/* Like task but waits for completion, useful w/ [S] */
			if (MATCH_CMD(line, "run ", x)) {
				svc_register(SVC_CMD_RUN, x, NULL);
				continue;
			}

			if (MATCH_CMD(line, "console ", x)) {
				if (console) free(console);
				console = strdup(strip_line(x));
				continue;
			}
			if (MATCH_CMD(line, "tty ", x)) {
				char *tty = strdup(strip_line(x));
				int baud  = 115200; /* XXX - Read from config file */
				tty_add(tty, baud);
				continue;
			}
		}
		fclose(fp);
	}
}


/**
 * Local Variables:
 *  version-control: t
 *  indent-tabs-mode: t
 *  c-file-style: "linux"
 * End:
 */