source: mainline/uspace/srv/sysman/main.c@ c1b2084

/*
 * Copyright (c) 2015 Michal Koutny
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <async.h>
#include <errno.h>
#include <fibril.h>
#include <ipc/sysman.h>
#include <macros.h>
#include <ns.h>
#include <stddef.h>
#include <stdio.h>
#include <str.h>

#include "configuration.h"
#include "connection_broker.h"
#include "connection_ctl.h"
#include "dep.h"
#include "job.h"
#include "log.h"
#include "sysman.h"
#include "unit.h"

#define NAME "sysman"

#define INITRD_DEVICE       "bd/initrd"
#define INITRD_MOUNT_POINT  "/"
#define INITRD_CFG_PATH     "/cfg/sysman"

#define TARGET_INIT     "initrd.tgt"
#define TARGET_ROOTFS   "rootfs.tgt"
#define TARGET_DEFAULT  "default.tgt"

#define UNIT_MNT_INITRD "initrd.mnt"
#define UNIT_CFG_INITRD "init.cfg"

static const char *target_sequence[] = {
        TARGET_INIT,
        TARGET_ROOTFS,
        TARGET_DEFAULT,
        NULL
};

/*
 * Forward declarations
 */
static void prepare_and_run_job(const char **target_name_ptr);

/*
 * Static functions
 */

static void sysman_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        sysman_interface_t iface = IPC_GET_ARG1(*icall);
        switch (iface) {
        case SYSMAN_PORT_BROKER:
                sysman_connection_broker(iid, icall);
                break;
        case SYSMAN_PORT_CTL:
                sysman_connection_ctl(iid, icall);
                break;
        default:
                /* Unknown interface */
                async_answer_0(iid, ENOENT);
        }
}

/** Build hard coded configuration */
static int create_entry_configuration(void) {
        int rc;
        unit_t *mnt_initrd = NULL;
        unit_t *cfg_init = NULL;
        unit_t *tgt_init = NULL;

        mnt_initrd = unit_create(UNIT_MOUNT);
        if (mnt_initrd == NULL) {
                rc = ENOMEM;
                goto fail;
        }
        mnt_initrd->name                 = str_dup(UNIT_MNT_INITRD);
        CAST_MNT(mnt_initrd)->type       = str_dup(STRING(RDFMT));
        CAST_MNT(mnt_initrd)->mountpoint = str_dup(INITRD_MOUNT_POINT);
        CAST_MNT(mnt_initrd)->device     = str_dup(INITRD_DEVICE);
        CAST_MNT(mnt_initrd)->autostart  = false;
        CAST_MNT(mnt_initrd)->blocking   = true;

        cfg_init = unit_create(UNIT_CONFIGURATION);
        if (cfg_init == NULL) {
                rc = ENOMEM;
                goto fail;
        }
        cfg_init->name           = str_dup(UNIT_CFG_INITRD);
        CAST_CFG(cfg_init)->path = str_dup(INITRD_CFG_PATH);
        
        tgt_init = unit_create(UNIT_TARGET);
        if (tgt_init == NULL) {
                rc = ENOMEM;
                goto fail;
        }
        tgt_init->name = str_dup(TARGET_INIT);
        

        /*
         * Add units to configuration and start the default target.
         */
        configuration_start_update();

        configuration_add_unit(mnt_initrd);
        configuration_add_unit(cfg_init);
        configuration_add_unit(tgt_init);

        rc = dep_add_dependency(tgt_init, cfg_init);
        if (rc != EOK) {
                goto rollback;
        }

        rc = dep_add_dependency(cfg_init, mnt_initrd);
        if (rc != EOK) {
                goto rollback;
        }

        configuration_commit();

        return EOK;

fail:
        unit_destroy(&tgt_init);
        unit_destroy(&cfg_init);
        unit_destroy(&mnt_initrd);
        return rc;

rollback:
        configuration_rollback();
        return rc;
}

static void sequence_job_handler(void *object, void *arg)
{
        job_t *job = object;
        if (job->retval == JOB_FAILED) {
                sysman_log(LVL_ERROR, "Failed to start '%s'.", unit_name(job->unit));
                job_del_ref(&job);
                return;
        }
        job_del_ref(&job);
        
        const char **target_name_ptr = arg;
        prepare_and_run_job(target_name_ptr + 1);
}

static void prepare_and_run_job(const char **target_name_ptr)
{
        const char *target_name = *target_name_ptr;

        if (target_name == NULL) {
                sysman_log(LVL_NOTE, "All initial units started.");
                return;
        }

        /* Previous targets should have loaded new units */
        unit_t *tgt = configuration_find_unit_by_name(target_name);
        if (tgt == NULL) {
                sysman_log(LVL_ERROR,
                    "Expected unit '%s' not found in configuration.",
                    target_name);
                return;
        }

        int rc = sysman_queue_job(tgt, STATE_STARTED, &sequence_job_handler,
            target_name_ptr);

        if (rc != EOK) {
                sysman_log(LVL_FATAL, "Cannot create job for '%s'.", target_name);
        }
}

int main(int argc, char *argv[])
{
        printf(NAME ": HelenOS system daemon\n");

        /*
         * Initialize global structures
         */
        configuration_init();
        sysman_events_init();
        job_queue_init();

        /*
         * Create initial configuration while we are in a single fibril
         */
        int rc = create_entry_configuration();
        if (rc != EOK) {
                sysman_log(LVL_FATAL,
                    "Could not create initial configuration (%i).", rc);
                return rc;
        }

        /*
         * Event loop runs in separate fibril, all consequent access to global
         * structure is made from this fibril only.
         */
        fid_t event_loop_fibril = fibril_create(sysman_events_loop, NULL);
        fibril_add_ready(event_loop_fibril);

        /* Queue first job from sequence */
        prepare_and_run_job(&target_sequence[0]);

        /* We're service too */
        rc = service_register(SERVICE_SYSMAN);
        if (rc != EOK) {
                sysman_log(LVL_FATAL,
                    "Cannot register at naming service (%i).", rc);
                return rc;
        }

        /* Start sysman server */
        async_set_client_connection(sysman_connection);

        printf(NAME ": Accepting connections\n");
        async_manager();

        /* not reached */
        return 0;
}