From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Tue, 6 Feb 2018 09:09:00 +0100
Subject: [PATCH] Add linux and initrd commands for grub-emu
When using grub-emu, the linux and initrd commands are used as arguments
to the kexec command line tool, to allow booting the selected menu entry.
---
grub-core/Makefile.core.def | 1 -
grub-core/kern/emu/main.c | 4 +
grub-core/kern/emu/misc.c | 18 ++++-
grub-core/loader/emu/linux.c | 172 +++++++++++++++++++++++++++++++++++++++++++
include/grub/emu/exec.h | 4 +-
include/grub/emu/hostfile.h | 3 +-
include/grub/emu/misc.h | 3 +
grub-core/Makefile.am | 1 +
8 files changed, 202 insertions(+), 4 deletions(-)
create mode 100644 grub-core/loader/emu/linux.c
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 058c88ac3af..5354f9613d3 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1826,7 +1826,6 @@ module = {
common = loader/linux.c;
common = lib/cmdline.c;
- enable = noemu;
efi = loader/efi/linux.c;
};
diff --git a/grub-core/kern/emu/main.c b/grub-core/kern/emu/main.c
index 55ea5a11ccd..846fe9715ec 100644
--- a/grub-core/kern/emu/main.c
+++ b/grub-core/kern/emu/main.c
@@ -107,6 +107,7 @@ static struct argp_option options[] = {
N_("use GRUB files in the directory DIR [default=%s]"), 0},
{"verbose", 'v', 0, 0, N_("print verbose messages."), 0},
{"hold", 'H', N_("SECS"), OPTION_ARG_OPTIONAL, N_("wait until a debugger will attach"), 0},
+ {"kexec", 'X', 0, 0, N_("try the untryable."), 0},
{ 0, 0, 0, 0, 0, 0 }
};
@@ -164,6 +165,9 @@ argp_parser (int key, char *arg, struct argp_state *state)
case 'v':
verbosity++;
break;
+ case 'X':
+ grub_util_set_kexecute();
+ break;
case ARGP_KEY_ARG:
{
diff --git a/grub-core/kern/emu/misc.c b/grub-core/kern/emu/misc.c
index 0ff13bcaf8c..eeea092752d 100644
--- a/grub-core/kern/emu/misc.c
+++ b/grub-core/kern/emu/misc.c
@@ -39,6 +39,7 @@
#include <grub/emu/misc.h>
int verbosity;
+int kexecute;
void
grub_util_warn (const char *fmt, ...)
@@ -82,7 +83,7 @@ grub_util_error (const char *fmt, ...)
vfprintf (stderr, fmt, ap);
va_end (ap);
fprintf (stderr, ".\n");
- exit (1);
+ grub_exit (1);
}
void *
@@ -154,6 +155,9 @@ void
__attribute__ ((noreturn))
grub_exit (int rc)
{
+#if defined (GRUB_KERNEL)
+ grub_reboot();
+#endif
exit (rc < 0 ? 1 : rc);
}
#endif
@@ -215,3 +219,15 @@ grub_util_load_image (const char *path, char *buf)
fclose (fp);
}
+
+void
+grub_util_set_kexecute(void)
+{
+ kexecute++;
+}
+
+int
+grub_util_get_kexecute(void)
+{
+ return kexecute;
+}
diff --git a/grub-core/loader/emu/linux.c b/grub-core/loader/emu/linux.c
new file mode 100644
index 00000000000..fda9e00d24c
--- /dev/null
+++ b/grub-core/loader/emu/linux.c
@@ -0,0 +1,172 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2006,2007,2008,2009,2010 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", "-l", 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_printf("%serforming 'kexec -l %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 '"PACKAGE"-emu --kexec' to force a system restart."));
+
+ grub_printf("Performing 'systemctl kexec' (%s) ",
+ (kexecute==1) ? "do-or-die" : "just-in-case");
+ rc = grub_util_exec (systemctl);
+
+ if (kexecute == 1)
+ grub_fatal (N_("Error trying to perform 'systemctl kexec'"));
+
+ /* need to check read-only root before resetting hard!? */
+ grub_printf("Performing 'kexec -e'");
+ kexec[1] = "-e";
+ kexec[2] = NULL;
+ rc = grub_util_exec(kexec);
+ if ( rc != GRUB_ERR_NONE )
+ grub_fatal (N_("Error trying to directly perform 'kexec -e'."));
+
+ return rc;
+}
+
+static grub_err_t
+grub_linux_unload (void)
+{
+ grub_dl_unref (my_mod);
+ if ( boot_cmdline != NULL )
+ 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;
+
+ 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]);
+
+ if ( kernel_path != NULL )
+ grub_free(kernel_path);
+
+ kernel_path = grub_xasprintf("%s", argv[0]);
+
+ if ( boot_cmdline != NULL ) {
+ 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]);
+
+ if ( initrd_path != NULL )
+ grub_free(initrd_path);
+
+ initrd_path = grub_xasprintf("%s", argv[0]);
+
+ 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;
+ kernel_path = NULL;
+ initrd_path = NULL;
+ boot_cmdline = NULL;
+}
+
+GRUB_MOD_FINI(linux)
+{
+ grub_unregister_command (cmd_linux);
+ grub_unregister_command (cmd_initrd);
+}
diff --git a/include/grub/emu/exec.h b/include/grub/emu/exec.h
index d1073ef86af..1b61b4a2e5d 100644
--- a/include/grub/emu/exec.h
+++ b/include/grub/emu/exec.h
@@ -23,6 +23,8 @@
#include <stdarg.h>
#include <sys/types.h>
+#include <grub/symbol.h>
+
pid_t
grub_util_exec_pipe (const char *const *argv, int *fd);
pid_t
@@ -32,7 +34,7 @@ int
grub_util_exec_redirect_all (const char *const *argv, const char *stdin_file,
const char *stdout_file, const char *stderr_file);
int
-grub_util_exec (const char *const *argv);
+EXPORT_FUNC(grub_util_exec) (const char *const *argv);
int
grub_util_exec_redirect (const char *const *argv, const char *stdin_file,
const char *stdout_file);
diff --git a/include/grub/emu/hostfile.h b/include/grub/emu/hostfile.h
index cfb1e2b5661..a61568e36e9 100644
--- a/include/grub/emu/hostfile.h
+++ b/include/grub/emu/hostfile.h
@@ -22,6 +22,7 @@
#include <grub/disk.h>
#include <grub/partition.h>
#include <sys/types.h>
+#include <grub/symbol.h>
#include <grub/osdep/hostfile.h>
int
@@ -29,7 +30,7 @@ grub_util_is_directory (const char *path);
int
grub_util_is_special_file (const char *path);
int
-grub_util_is_regular (const char *path);
+EXPORT_FUNC(grub_util_is_regular) (const char *path);
char *
grub_util_path_concat (size_t n, ...);
diff --git a/include/grub/emu/misc.h b/include/grub/emu/misc.h
index ff9c48a6490..01056954b96 100644
--- a/include/grub/emu/misc.h
+++ b/include/grub/emu/misc.h
@@ -57,6 +57,9 @@ void EXPORT_FUNC(grub_util_warn) (const char *fmt, ...) __attribute__ ((format (
void EXPORT_FUNC(grub_util_info) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2)));
void EXPORT_FUNC(grub_util_error) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2), noreturn));
+void EXPORT_FUNC(grub_util_set_kexecute) (void);
+int EXPORT_FUNC(grub_util_get_kexecute) (void) WARN_UNUSED_RESULT;
+
grub_uint64_t EXPORT_FUNC (grub_util_get_cpu_time_ms) (void);
#ifdef HAVE_DEVICE_MAPPER
diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am
index ee88e44e97a..80e7a83edf9 100644
--- a/grub-core/Makefile.am
+++ b/grub-core/Makefile.am
@@ -307,6 +307,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/net.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/hostdisk.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/hostfile.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/extcmd.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/exec.h
if COND_GRUB_EMU_SDL
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/sdl.h
endif