source: mainline/uspace/app/init/init.c

/*
 * Copyright (c) 2024 Jiri Svoboda
 * Copyright (c) 2005 Martin Decky
 * 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.
 */

/** @addtogroup init
 * @{
 */
/**
 * @file
 */

#include <stdio.h>
#include <stdarg.h>
#include <vfs/vfs.h>
#include <stdbool.h>
#include <errno.h>
#include <task.h>
#include <stdlib.h>
#include <macros.h>
#include <str.h>
#include <loc.h>
#include <str_error.h>
#include <io/logctl.h>
#include <vfs/vfs.h>
#include "untar.h"
#include "init.h"

#define BANNER_LEFT   "######> "
#define BANNER_RIGHT  " <######"

#define ROOT_DEVICE       "bd/initrd"
#define ROOT_MOUNT_POINT  "/"

#define srv_start(path, ...) \
        srv_startl(path, path, ##__VA_ARGS__, NULL)

/** Print banner */
static void info_print(void)
{
        printf("%s: HelenOS init\n", NAME);
}

static void oom_check(errno_t rc, const char *path)
{
        if (rc == ENOMEM) {
                printf("%sOut-of-memory condition detected%s\n", BANNER_LEFT,
                    BANNER_RIGHT);
                printf("%sBailing out of the boot process after %s%s\n",
                    BANNER_LEFT, path, BANNER_RIGHT);
                printf("%sMore physical memory is required%s\n", BANNER_LEFT,
                    BANNER_RIGHT);
                exit(ENOMEM);
        }
}

/** Report mount operation success */
static bool mount_report(const char *desc, const char *mntpt,
    const char *fstype, const char *dev, errno_t rc)
{
        switch (rc) {
        case EOK:
                if ((dev != NULL) && (str_cmp(dev, "") != 0))
                        printf("%s: %s mounted on %s (%s at %s)\n", NAME, desc, mntpt,
                            fstype, dev);
                else
                        printf("%s: %s mounted on %s (%s)\n", NAME, desc, mntpt, fstype);
                break;
        case EBUSY:
                printf("%s: %s already mounted on %s\n", NAME, desc, mntpt);
                return false;
        case ELIMIT:
                printf("%s: %s limit exceeded\n", NAME, desc);
                return false;
        case ENOENT:
                printf("%s: %s unknown type (%s)\n", NAME, desc, fstype);
                return false;
        default:
                printf("%s: %s not mounted on %s (%s)\n", NAME, desc, mntpt,
                    str_error(rc));
                return false;
        }

        return true;
}

/** Mount root file system
 *
 * The operation blocks until the root file system
 * server is ready for mounting.
 *
 * @param[in] fstype Root file system type.
 *
 * @return True on success.
 * @return False on failure.
 *
 */
static bool mount_root(const char *fstype)
{
        const char *root_device = "";

        if (str_cmp(fstype, "tmpfs") != 0)
                root_device = ROOT_DEVICE;

        errno_t rc = vfs_mount_path(ROOT_MOUNT_POINT, fstype, root_device, "",
            IPC_FLAG_BLOCKING, 0);
        if (rc == EOK)
                logctl_set_root();

        bool ret = mount_report("Root file system", ROOT_MOUNT_POINT, fstype,
            root_device, rc);

        rc = vfs_cwd_set(ROOT_MOUNT_POINT);
        if (rc != EOK) {
                printf("%s: Unable to set current directory to %s (%s)\n",
                    NAME, ROOT_MOUNT_POINT, str_error(ret));
                return false;
        }

        if ((ret) && (str_cmp(fstype, "tmpfs") == 0)) {
                printf("%s: Extracting root file system archive\n", NAME);
                ret = bd_untar(ROOT_DEVICE);
        }

        return ret;
}

static errno_t srv_startl(const char *path, ...)
{
        vfs_stat_t s;
        if (vfs_stat_path(path, &s) != EOK) {
                printf("%s: Unable to stat %s\n", NAME, path);
                return ENOENT;
        }

        printf("%s: Starting %s\n", NAME, path);

        va_list ap;
        const char *arg;
        int cnt = 0;

        va_start(ap, path);
        do {
                arg = va_arg(ap, const char *);
                cnt++;
        } while (arg != NULL);
        va_end(ap);

        va_start(ap, path);
        task_id_t id;
        task_wait_t wait;
        errno_t rc = task_spawn(&id, &wait, path, cnt, ap);
        va_end(ap);

        if (rc != EOK) {
                oom_check(rc, path);
                printf("%s: Error spawning %s (%s)\n", NAME, path,
                    str_error(rc));
                return rc;
        }

        if (!id) {
                printf("%s: Error spawning %s (invalid task id)\n", NAME,
                    path);
                return EINVAL;
        }

        task_exit_t texit;
        int retval;
        rc = task_wait(&wait, &texit, &retval);
        if (rc != EOK) {
                printf("%s: Error waiting for %s (%s)\n", NAME, path,
                    str_error(rc));
                return rc;
        }

        if (texit != TASK_EXIT_NORMAL) {
                printf("%s: Server %s failed to start (unexpectedly "
                    "terminated)\n", NAME, path);
                return EINVAL;
        }

        if (retval != 0)
                printf("%s: Server %s failed to start (exit code %d)\n", NAME,
                    path, retval);

        return retval == 0 ? EOK : EPARTY;
}

int main(int argc, char *argv[])
{
        info_print();

        if (!mount_root(STRING(RDFMT))) {
                printf("%s: Exiting\n", NAME);
                return 1;
        }

        /* System server takes over once root is mounted */
        srv_start("/srv/system");
        return 0;
}

/** @}
 */