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