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131 lines
3.4 KiB
131 lines
3.4 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: Wed, 18 Jul 2018 08:08:02 +0200
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Subject: [PATCH] blscfg: Expand the BLS options field instead of showing its
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variables
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The values of the BLS fragment fields can either be string literals or
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grub2 environment variables, the latter will be expanded by grub2 when
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the boot entry is selected.
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But from a usability point of view, is much more convenient if the BLS
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parse code expand any variables that are present in the options field.
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That will allow users to select an entry in the menu by pressing the e
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key and edit the kernel command line parameters. So for example instead
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of showing the following:
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kernel /boot/vmlinuz-4.17.0 $kernelopts
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It would show something like the following:
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kernel /boot/vmlinuz-4.17.0 root=UUID=cec677c9-c890-4103-b94a-bcc191642935
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Suggested-by: Hans de Goede <hdegoede@redhat.com>
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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 | 69 ++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 68 insertions(+), 1 deletion(-)
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diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
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index c6addc4dc..80d8814fc 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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@@ -32,6 +32,8 @@
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#include <grub/normal.h>
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#include <grub/lib/envblk.h>
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+#include <stdbool.h>
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+
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GRUB_MOD_LICENSE ("GPLv3+");
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#include "loadenv.h"
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@@ -506,6 +508,70 @@ static char **bls_make_list (struct bls_entry *entry, const char *key, int *num)
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return list;
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}
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+static char *field_append(bool is_var, char *buffer, char *start, char *end)
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+{
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+ char *temp = grub_strndup(start, end - start + 1);
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+ const char *field = temp;
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+
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+ if (is_var) {
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+ field = grub_env_get (temp);
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+ if (!field)
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+ return buffer;
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+ }
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+
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+ if (!buffer) {
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+ buffer = grub_strdup(field);
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+ if (!buffer)
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+ return NULL;
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+ } else {
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+ buffer = grub_realloc (buffer, grub_strlen(buffer) + grub_strlen(field));
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+ if (!buffer)
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+ return NULL;
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+
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+ grub_stpcpy (buffer + grub_strlen(buffer), field);
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+ }
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+
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+ return buffer;
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+}
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+
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+static char *expand_val(char *value)
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+{
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+ char *buffer = NULL;
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+ char *start = value;
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+ char *end = value;
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+ bool is_var = false;
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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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+ buffer = field_append(is_var, buffer, start, end);
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+ if (!buffer)
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+ return NULL;
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+ }
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+
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+ is_var = true;
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+ start = value + 1;
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+ } else if (is_var) {
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+ if (!grub_isalnum(*value) && *value != '_') {
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+ buffer = field_append(is_var, buffer, start, end);
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+ is_var = false;
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+ start = value;
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+ }
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+ }
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+
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+ end = value;
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+ value++;
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+ }
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+
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+ if (start != end) {
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+ buffer = field_append(is_var, buffer, start, end);
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+ if (!buffer)
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+ return NULL;
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+ }
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+
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+ return buffer;
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+}
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+
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static void create_entry (struct bls_entry *entry)
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{
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int argc = 0;
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@@ -536,7 +602,7 @@ static void create_entry (struct bls_entry *entry)
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}
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title = bls_get_val (entry, "title", NULL);
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- options = bls_get_val (entry, "options", NULL);
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+ options = expand_val (bls_get_val (entry, "options", NULL));
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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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@@ -594,6 +660,7 @@ static void create_entry (struct bls_entry *entry)
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finish:
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grub_free (initrd);
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grub_free (initrds);
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+ grub_free (options);
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grub_free (classes);
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grub_free (args);
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grub_free (argv);
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