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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: Tue, 26 Feb 2019 20:11:27 +0100
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Subject: [PATCH] blscfg: fallback to default_kernelopts if BLS option field
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isn't set
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If the $kernelopts variable isn't found, then the entry will fail to boot
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since there won't be a kernel command line params set. This makes the BLS
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configuration more fragile than a non-BLS one, since in that case it will
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boot even without a correct grubenv file.
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So set a $default_kernelopts in the GRUB config file that will be used as
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a fallback if the value in the BLS options field can't be resolved.
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Related: rhbz#1625124
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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grub-core/commands/blscfg.c | 7 +++++++
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util/grub.d/10_linux.in | 2 ++
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2 files changed, 9 insertions(+)
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diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
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index c432c6ba2..11cc82b6f 100644
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--- a/grub-core/commands/blscfg.c
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+++ b/grub-core/commands/blscfg.c
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@@ -628,6 +628,9 @@ static char *expand_val(char *value)
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char *end = value;
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bool is_var = false;
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+ if (!value)
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+ return NULL;
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+
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while (*value) {
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if (*value == '$') {
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if (start != end) {
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@@ -701,6 +704,10 @@ static void create_entry (struct bls_entry *entry)
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title = bls_get_val (entry, "title", NULL);
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options = expand_val (bls_get_val (entry, "options", NULL));
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+
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+ if (!options)
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+ options = expand_val (grub_env_get("default_kernelopts"));
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+
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initrds = bls_make_list (entry, "initrd", NULL);
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hotkey = bls_get_val (entry, "grub_hotkey", NULL);
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diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
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index da2992ac9..04fd8953f 100644
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--- a/util/grub.d/10_linux.in
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+++ b/util/grub.d/10_linux.in
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@@ -158,6 +158,8 @@ linux_entry ()
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populate_header_warn
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cat << EOF
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+set default_kernelopts="root=${linux_root_device_thisversion} ro ${args}"
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+
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insmod blscfg
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blscfg
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if [ -s \$prefix/grubenv ]; then
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