352 lines
10 KiB
Diff
352 lines
10 KiB
Diff
From 66022d237950cdae4686ed2d2f82d1cee3bba481 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Tue, 6 Feb 2018 09:09:00 +0100
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Subject: [PATCH] Add linux and initrd commands for grub-emu
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When using grub-emu, the linux and initrd commands are used as arguments
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to the kexec command line tool, to allow booting the selected menu entry.
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---
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grub-core/Makefile.core.def | 2 +-
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grub-core/kern/emu/main.c | 4 +
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grub-core/kern/emu/misc.c | 18 ++++-
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grub-core/loader/emu/linux.c | 172 +++++++++++++++++++++++++++++++++++++++++++
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include/grub/emu/exec.h | 4 +-
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include/grub/emu/hostfile.h | 3 +-
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include/grub/emu/misc.h | 3 +
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grub-core/Makefile.am | 1 +
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8 files changed, 203 insertions(+), 4 deletions(-)
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create mode 100644 grub-core/loader/emu/linux.c
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diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
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index 8e6110e4bb6..7edff60ccd4 100644
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--- a/grub-core/Makefile.core.def
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+++ b/grub-core/Makefile.core.def
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@@ -1710,10 +1710,10 @@ module = {
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arm = loader/arm/linux.c;
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arm64 = loader/arm64/linux.c;
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arm64 = loader/efi/linux.c;
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+ emu = loader/emu/linux.c;
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fdt = lib/fdt.c;
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common = loader/linux.c;
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common = lib/cmdline.c;
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- enable = noemu;
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};
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module = {
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diff --git a/grub-core/kern/emu/main.c b/grub-core/kern/emu/main.c
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index 55ea5a11ccd..846fe9715ec 100644
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--- a/grub-core/kern/emu/main.c
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+++ b/grub-core/kern/emu/main.c
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@@ -107,6 +107,7 @@ static struct argp_option options[] = {
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N_("use GRUB files in the directory DIR [default=%s]"), 0},
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{"verbose", 'v', 0, 0, N_("print verbose messages."), 0},
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{"hold", 'H', N_("SECS"), OPTION_ARG_OPTIONAL, N_("wait until a debugger will attach"), 0},
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+ {"kexec", 'X', 0, 0, N_("try the untryable."), 0},
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{ 0, 0, 0, 0, 0, 0 }
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};
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@@ -164,6 +165,9 @@ argp_parser (int key, char *arg, struct argp_state *state)
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case 'v':
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verbosity++;
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break;
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+ case 'X':
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+ grub_util_set_kexecute();
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+ break;
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case ARGP_KEY_ARG:
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{
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diff --git a/grub-core/kern/emu/misc.c b/grub-core/kern/emu/misc.c
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index 82012a72fcb..3d3a4a4a975 100644
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--- a/grub-core/kern/emu/misc.c
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+++ b/grub-core/kern/emu/misc.c
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@@ -37,6 +37,7 @@
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#include <grub/emu/misc.h>
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int verbosity;
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+int kexecute;
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void
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grub_util_warn (const char *fmt, ...)
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@@ -80,7 +81,7 @@ grub_util_error (const char *fmt, ...)
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vfprintf (stderr, fmt, ap);
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va_end (ap);
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fprintf (stderr, ".\n");
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- exit (1);
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+ grub_exit (1);
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}
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void *
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@@ -140,6 +141,9 @@ void
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__attribute__ ((noreturn))
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grub_exit (int rc)
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{
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+#if defined (GRUB_KERNEL)
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+ grub_reboot();
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+#endif
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exit (rc < 0 ? 1 : rc);
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}
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#endif
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@@ -201,3 +205,15 @@ grub_util_load_image (const char *path, char *buf)
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fclose (fp);
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}
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+
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+void
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+grub_util_set_kexecute(void)
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+{
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+ kexecute++;
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+}
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+
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+int
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+grub_util_get_kexecute(void)
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+{
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+ return kexecute;
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+}
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diff --git a/grub-core/loader/emu/linux.c b/grub-core/loader/emu/linux.c
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new file mode 100644
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index 00000000000..fda9e00d24c
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--- /dev/null
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+++ b/grub-core/loader/emu/linux.c
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@@ -0,0 +1,172 @@
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+/*
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+ * GRUB -- GRand Unified Bootloader
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+ * Copyright (C) 2006,2007,2008,2009,2010 Free Software Foundation, Inc.
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+ *
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+ * GRUB is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * GRUB is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <grub/loader.h>
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+#include <grub/dl.h>
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+#include <grub/command.h>
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+#include <grub/time.h>
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+
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+#include <grub/emu/exec.h>
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+#include <grub/emu/hostfile.h>
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+#include <grub/emu/misc.h>
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+
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+GRUB_MOD_LICENSE ("GPLv3+");
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+
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+static grub_dl_t my_mod;
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+
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+static char *kernel_path;
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+static char *initrd_path;
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+static char *boot_cmdline;
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+
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+static grub_err_t
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+grub_linux_boot (void)
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+{
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+ grub_err_t rc = GRUB_ERR_NONE;
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+ char *initrd_param;
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+ const char *kexec[] = { "kexec", "-l", kernel_path, boot_cmdline, NULL, NULL };
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+ const char *systemctl[] = { "systemctl", "kexec", NULL };
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+ int kexecute = grub_util_get_kexecute();
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+
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+ if (initrd_path) {
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+ initrd_param = grub_xasprintf("--initrd=%s", initrd_path);
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+ kexec[3] = initrd_param;
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+ kexec[4] = boot_cmdline;
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+ } else {
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+ initrd_param = grub_xasprintf("%s", "");
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+ }
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+
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+ grub_printf("%serforming 'kexec -l %s %s %s'\n",
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+ (kexecute) ? "P" : "Not p",
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+ kernel_path, initrd_param, boot_cmdline);
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+
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+ if (kexecute)
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+ rc = grub_util_exec(kexec);
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+
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+ grub_free(initrd_param);
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+
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+ if (rc != GRUB_ERR_NONE) {
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+ grub_error (rc, N_("Error trying to perform kexec load operation."));
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+ grub_sleep (3);
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+ return rc;
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+ }
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+ if (kexecute < 1)
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+ grub_fatal (N_("Use '"PACKAGE"-emu --kexec' to force a system restart."));
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+
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+ grub_printf("Performing 'systemctl kexec' (%s) ",
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+ (kexecute==1) ? "do-or-die" : "just-in-case");
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+ rc = grub_util_exec (systemctl);
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+
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+ if (kexecute == 1)
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+ grub_fatal (N_("Error trying to perform 'systemctl kexec'"));
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+
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+ /* need to check read-only root before resetting hard!? */
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+ grub_printf("Performing 'kexec -e'");
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+ kexec[1] = "-e";
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+ kexec[2] = NULL;
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+ rc = grub_util_exec(kexec);
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+ if ( rc != GRUB_ERR_NONE )
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+ grub_fatal (N_("Error trying to directly perform 'kexec -e'."));
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+
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+ return rc;
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+}
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+
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+static grub_err_t
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+grub_linux_unload (void)
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+{
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+ grub_dl_unref (my_mod);
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+ if ( boot_cmdline != NULL )
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+ grub_free (boot_cmdline);
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+ boot_cmdline = NULL;
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+ return GRUB_ERR_NONE;
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+}
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+
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+static grub_err_t
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+grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), int argc, char *argv[])
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+{
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+ int i;
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+ char *tempstr;
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+
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+ grub_dl_ref (my_mod);
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+
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+ if (argc == 0)
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+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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+
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+ if ( !grub_util_is_regular(argv[0]) )
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+ return grub_error(GRUB_ERR_FILE_NOT_FOUND, N_("Cannot find kernel file %s"), argv[0]);
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+
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+ if ( kernel_path != NULL )
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+ grub_free(kernel_path);
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+
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+ kernel_path = grub_xasprintf("%s", argv[0]);
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+
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+ if ( boot_cmdline != NULL ) {
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+ grub_free(boot_cmdline);
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+ boot_cmdline = NULL;
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+ }
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+
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+ if ( argc > 1 )
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+ {
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+ boot_cmdline = grub_xasprintf("--command-line=%s", argv[1]);
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+ for ( i = 2; i < argc; i++ ) {
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+ tempstr = grub_xasprintf("%s %s", boot_cmdline, argv[i]);
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+ grub_free(boot_cmdline);
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+ boot_cmdline = tempstr;
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+ }
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+ }
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+
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+ grub_loader_set (grub_linux_boot, grub_linux_unload, 0);
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+
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+ return GRUB_ERR_NONE;
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+}
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+
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+static grub_err_t
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+grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), int argc, char *argv[])
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+{
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+ if (argc == 0)
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+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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+
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+ if ( !grub_util_is_regular(argv[0]) )
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+ return grub_error(GRUB_ERR_FILE_NOT_FOUND, N_("Cannot find initrd file %s"), argv[0]);
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+
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+ if ( initrd_path != NULL )
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+ grub_free(initrd_path);
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+
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+ initrd_path = grub_xasprintf("%s", argv[0]);
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+
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+ grub_dl_unref (my_mod);
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+
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+ return GRUB_ERR_NONE;
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+}
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+
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+static grub_command_t cmd_linux, cmd_initrd;
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+
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+GRUB_MOD_INIT(linux)
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+{
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+ cmd_linux = grub_register_command ("linux", grub_cmd_linux, 0, N_("Load Linux."));
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+ cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, 0, N_("Load initrd."));
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+ my_mod = mod;
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+ kernel_path = NULL;
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+ initrd_path = NULL;
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+ boot_cmdline = NULL;
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+}
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+
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+GRUB_MOD_FINI(linux)
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+{
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+ grub_unregister_command (cmd_linux);
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+ grub_unregister_command (cmd_initrd);
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+}
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diff --git a/include/grub/emu/exec.h b/include/grub/emu/exec.h
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index d1073ef86af..1b61b4a2e5d 100644
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--- a/include/grub/emu/exec.h
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+++ b/include/grub/emu/exec.h
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@@ -23,6 +23,8 @@
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#include <stdarg.h>
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#include <sys/types.h>
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+#include <grub/symbol.h>
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+
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pid_t
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grub_util_exec_pipe (const char *const *argv, int *fd);
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pid_t
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@@ -32,7 +34,7 @@ int
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grub_util_exec_redirect_all (const char *const *argv, const char *stdin_file,
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const char *stdout_file, const char *stderr_file);
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int
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-grub_util_exec (const char *const *argv);
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+EXPORT_FUNC(grub_util_exec) (const char *const *argv);
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int
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grub_util_exec_redirect (const char *const *argv, const char *stdin_file,
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const char *stdout_file);
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diff --git a/include/grub/emu/hostfile.h b/include/grub/emu/hostfile.h
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index 8e37d5acb42..12c937a1af9 100644
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--- a/include/grub/emu/hostfile.h
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+++ b/include/grub/emu/hostfile.h
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@@ -22,6 +22,7 @@
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#include <grub/disk.h>
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#include <grub/partition.h>
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#include <sys/types.h>
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+#include <grub/symbol.h>
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#include <grub/osdep/hostfile.h>
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int
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@@ -29,7 +30,7 @@ grub_util_is_directory (const char *path);
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int
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grub_util_is_special_file (const char *path);
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int
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-grub_util_is_regular (const char *path);
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+EXPORT_FUNC(grub_util_is_regular) (const char *path);
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char *
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grub_util_path_concat (size_t n, ...);
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diff --git a/include/grub/emu/misc.h b/include/grub/emu/misc.h
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index df6085bcb7c..a653132e36a 100644
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--- a/include/grub/emu/misc.h
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+++ b/include/grub/emu/misc.h
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@@ -60,6 +60,9 @@ void EXPORT_FUNC(grub_util_warn) (const char *fmt, ...) __attribute__ ((format (
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void EXPORT_FUNC(grub_util_info) (const char *fmt, ...) __attribute__ ((format (__printf__, 1, 2)));
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void EXPORT_FUNC(grub_util_error) (const char *fmt, ...) __attribute__ ((format (__printf__, 1, 2), noreturn));
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+void EXPORT_FUNC(grub_util_set_kexecute) (void);
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+int EXPORT_FUNC(grub_util_get_kexecute) (void) WARN_UNUSED_RESULT;
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+
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grub_uint64_t EXPORT_FUNC (grub_util_get_cpu_time_ms) (void);
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#ifdef HAVE_DEVICE_MAPPER
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diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am
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index f7b4d29b0b3..75e8715e631 100644
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--- a/grub-core/Makefile.am
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+++ b/grub-core/Makefile.am
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@@ -275,6 +275,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/net.h
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KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/hostdisk.h
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KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/hostfile.h
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KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/extcmd.h
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+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/exec.h
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if COND_GRUB_EMU_SDL
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KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/sdl.h
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endif
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