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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2022 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/loader.h>
#include <grub/dl.h>
#include <grub/command.h>
#include <grub/time.h>
#include <grub/emu/exec.h>
#include <grub/emu/hostfile.h>
#include <grub/emu/misc.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_dl_t my_mod;
static char *kernel_path;
static char *initrd_path;
static char *boot_cmdline;
static grub_err_t
grub_linux_boot (void)
{
grub_err_t rc = GRUB_ERR_NONE;
char *initrd_param;
const char *kexec[] = {"kexec", "-la", kernel_path, boot_cmdline, NULL, NULL};
const char *systemctl[] = {"systemctl", "kexec", NULL};
int kexecute = grub_util_get_kexecute ();
if (initrd_path)
{
initrd_param = grub_xasprintf ("--initrd=%s", initrd_path);
kexec[3] = initrd_param;
kexec[4] = boot_cmdline;
}
else
initrd_param = grub_xasprintf ("%s", "");
grub_dprintf ("linux", "%serforming 'kexec -la %s %s %s'\n",
(kexecute) ? "P" : "Not p",
kernel_path, initrd_param, boot_cmdline);
if (kexecute)
rc = grub_util_exec (kexec);
grub_free (initrd_param);
if (rc != GRUB_ERR_NONE)
{
grub_error (rc, N_("error trying to perform kexec load operation"));
grub_sleep (3);
return rc;
}
if (kexecute < 1)
grub_fatal (N_("use '%s %s' to force a system restart"), program_name, "--kexec");
grub_dprintf ("linux", "Performing 'systemctl kexec' (%s) ",
(kexecute==1) ? "do-or-die" : "just-in-case");
rc = grub_util_exec (systemctl);
/* `systemctl kexec` is "asynchronous" and will return even on success. */
if (rc == 0)
grub_sleep (10);
if (kexecute == 1)
grub_fatal (N_("error trying to perform 'systemctl kexec': %d"), rc);
/*
* WARNING: forcible reset should only be used in read-only environments.
* grub-emu cannot check for these - users beware.
*/
grub_dprintf ("linux", "Performing 'kexec -ex'");
kexec[1] = "-ex";
kexec[2] = NULL;
rc = grub_util_exec (kexec);
if (rc != GRUB_ERR_NONE)
grub_fatal (N_("error trying to directly perform 'kexec -ex': %d"), rc);
return rc;
}
static grub_err_t
grub_linux_unload (void)
{
/* Unloading: we're no longer in use. */
grub_dl_unref (my_mod);
grub_free (boot_cmdline);
boot_cmdline = NULL;
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), int argc,
char *argv[])
{
int i;
char *tempstr;
/* Mark ourselves as in-use. */
grub_dl_ref (my_mod);
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
if (!grub_util_is_regular (argv[0]))
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
N_("cannot find kernel file %s"), argv[0]);
grub_free (kernel_path);
kernel_path = grub_xasprintf ("%s", argv[0]);
grub_free (boot_cmdline);
boot_cmdline = NULL;
if (argc > 1)
{
boot_cmdline = grub_xasprintf ("--command-line=%s", argv[1]);
for (i = 2; i < argc; i++)
{
tempstr = grub_xasprintf ("%s %s", boot_cmdline, argv[i]);
grub_free (boot_cmdline);
boot_cmdline = tempstr;
}
}
grub_loader_set (grub_linux_boot, grub_linux_unload, 0);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), int argc,
char *argv[])
{
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
if (!grub_util_is_regular (argv[0]))
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
N_("Cannot find initrd file %s"), argv[0]);
grub_free (initrd_path);
initrd_path = grub_xasprintf ("%s", argv[0]);
/* We are done - mark ourselves as on longer in use. */
grub_dl_unref (my_mod);
return GRUB_ERR_NONE;
}
static grub_command_t cmd_linux, cmd_initrd;
GRUB_MOD_INIT (linux)
{
cmd_linux = grub_register_command ("linux", grub_cmd_linux, 0,
N_("Load Linux."));
cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, 0,
N_("Load initrd."));
my_mod = mod;
}
GRUB_MOD_FINI (linux)
{
grub_unregister_command (cmd_linux);
grub_unregister_command (cmd_initrd);
}
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