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grub2/SOURCES/0115-Enable-blscfg-command-...

165 lines
4.7 KiB

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Fri, 2 Feb 2018 11:36:29 +0100
Subject: [PATCH] Enable blscfg command for the emu platform
Allow grub-emu to call a blscfg command. This may be useful for platforms
that don't support GRUB, so grub-emu can be used to parse the BLS configs
and kexec a new kernel using that information.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
grub-core/Makefile.core.def | 1 +
grub-core/commands/blscfg.c | 46 +++++++++++++++++++++++++++++++++++----------
2 files changed, 37 insertions(+), 10 deletions(-)
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 96ccb4021..e52d77688 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -777,6 +777,7 @@ module = {
common = commands/blscfg.c;
enable = efi;
enable = i386_pc;
+ enable = emu;
};
module = {
diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
index 86796c8cd..e0b65534a 100644
--- a/grub-core/commands/blscfg.c
+++ b/grub-core/commands/blscfg.c
@@ -37,7 +37,12 @@ GRUB_MOD_LICENSE ("GPLv3+");
#include "loadenv.h"
#define GRUB_BLS_CONFIG_PATH "/loader/entries/"
+#ifdef GRUB_MACHINE_EMU
+#define GRUB_BOOT_DEVICE "/boot"
+#else
#define GRUB_BOOT_DEVICE "($root)"
+#endif
+
#ifdef GRUB_MACHINE_EFI
#define GRUB_LINUX_CMD "linuxefi"
#define GRUB_INITRD_CMD "initrdefi"
@@ -46,6 +51,13 @@ GRUB_MOD_LICENSE ("GPLv3+");
#define GRUB_INITRD_CMD "initrd"
#endif
+enum
+ {
+ PLATFORM_EFI,
+ PLATFORM_EMU,
+ PLATFORM_BIOS,
+ };
+
#define grub_free(x) ({grub_dprintf("blscfg", "%s freeing %p\n", __func__, x); grub_free(x); })
struct keyval
@@ -641,7 +653,7 @@ finish:
struct find_entry_info {
grub_device_t dev;
grub_fs_t fs;
- int efi;
+ int platform;
};
/*
@@ -668,13 +680,16 @@ static int find_entry (const char *filename,
!grub_strcmp (filename, ".."))
return 0;
- if (info->efi && !grub_strcasecmp (filename, "boot"))
+ if (info->platform == PLATFORM_EFI && !grub_strcasecmp (filename, "boot"))
return 0;
saved_env_buf = grub_malloc (512);
// set a default blsdir
- if (info->efi)
+ if (info->platform == PLATFORM_EMU)
+ default_blsdir = grub_xasprintf ("%s%s", GRUB_BOOT_DEVICE,
+ GRUB_BLS_CONFIG_PATH);
+ else if (info->platform == PLATFORM_EFI)
default_blsdir = grub_xasprintf ("/EFI/%s%s", filename,
GRUB_BLS_CONFIG_PATH);
else
@@ -686,7 +701,7 @@ static int find_entry (const char *filename,
/*
* try to load a grubenv from /EFI/wherever/grubenv
*/
- if (info->efi)
+ if (info->platform == PLATFORM_EFI)
grubenv_path = grub_xasprintf ("(%s)/EFI/%s/grubenv", devid, filename);
else
grubenv_path = grub_xasprintf ("(%s)/grub2/grubenv", devid);
@@ -740,7 +755,7 @@ static int find_entry (const char *filename,
goto finish;
grub_dprintf ("blscfg", "blsdir: \"%s\"\n", blsdir);
- if (blsdir[0] != '/' && info->efi)
+ if (blsdir[0] != '/' && info->platform == PLATFORM_EFI)
blsdir = grub_xasprintf ("/EFI/%s/%s/", filename, blsdir);
else
blsdir = grub_strdup (blsdir);
@@ -818,15 +833,21 @@ grub_cmd_blscfg (grub_extcmd_context_t ctxt UNUSED,
{
.dev = NULL,
.fs = NULL,
- .efi = 0,
+ .platform = PLATFORM_BIOS,
};
grub_dprintf ("blscfg", "finding boot\n");
+
+#ifdef GRUB_MACHINE_EMU
+ devid = "host";
+ grub_env_set ("boot", devid);
+#else
devid = grub_env_get ("boot");
if (!devid)
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
N_("variable `%s' isn't set"), "boot");
+#endif
grub_dprintf ("blscfg", "opening %s\n", devid);
dev = grub_device_open (devid);
@@ -844,11 +865,16 @@ grub_cmd_blscfg (grub_extcmd_context_t ctxt UNUSED,
info.dev = dev;
info.fs = fs;
#ifdef GRUB_MACHINE_EFI
- info.efi = 1;
+ info.platform = PLATFORM_EFI;
grub_dprintf ("blscfg", "scanning /EFI/\n");
r = fs->dir (dev, "/EFI/", find_entry, &info);
+#elif GRUB_MACHINE_EMU
+ info.platform = PLATFORM_EMU;
+ grub_dprintf ("blscfg", "scanning %s%s\n", GRUB_BOOT_DEVICE,
+ GRUB_BLS_CONFIG_PATH);
+ r = fs->dir (dev, "/boot/loader/",
+ find_entry, &info);
#else
- info.efi = 0;
grub_dprintf ("blscfg", "scanning %s\n", GRUB_BLS_CONFIG_PATH);
r = fs->dir (dev, "/", find_entry, &info);
#endif
@@ -863,7 +889,7 @@ finish:
static grub_extcmd_t cmd;
static grub_extcmd_t oldcmd;
-GRUB_MOD_INIT(bls)
+GRUB_MOD_INIT(blscfg)
{
grub_dprintf("blscfg", "%s got here\n", __func__);
cmd = grub_register_extcmd ("blscfg",
@@ -880,7 +906,7 @@ GRUB_MOD_INIT(bls)
NULL);
}
-GRUB_MOD_FINI(bls)
+GRUB_MOD_FINI(blscfg)
{
grub_unregister_extcmd (cmd);
grub_unregister_extcmd (oldcmd);