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grub2/SOURCES/0014-Allow-fallback-to-incl...

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Fri, 5 Sep 2014 10:07:04 -0400
Subject: [PATCH] Allow "fallback" to include entries by title, not just
number.
Resolves: rhbz#1026084
Signed-off-by: Peter Jones <pjones@redhat.com>
---
grub-core/normal/menu.c | 85 +++++++++++++++++++++++++++++++++----------------
1 file changed, 58 insertions(+), 27 deletions(-)
diff --git a/grub-core/normal/menu.c b/grub-core/normal/menu.c
index e7a83c2d6..d2f64b05e 100644
--- a/grub-core/normal/menu.c
+++ b/grub-core/normal/menu.c
@@ -163,16 +163,41 @@ grub_menu_set_timeout (int timeout)
}
}
+static int
+menuentry_eq (const char *id, const char *spec)
+{
+ const char *ptr1, *ptr2;
+ ptr1 = id;
+ ptr2 = spec;
+ while (1)
+ {
+ if (*ptr2 == '>' && ptr2[1] != '>' && *ptr1 == 0)
+ return ptr2 - spec;
+ if (*ptr2 == '>' && ptr2[1] != '>')
+ return 0;
+ if (*ptr2 == '>')
+ ptr2++;
+ if (*ptr1 != *ptr2)
+ return 0;
+ if (*ptr1 == 0)
+ return ptr1 - id;
+ ptr1++;
+ ptr2++;
+ }
+ return 0;
+}
+
/* Get the first entry number from the value of the environment variable NAME,
which is a space-separated list of non-negative integers. The entry number
which is returned is stripped from the value of NAME. If no entry number
can be found, -1 is returned. */
static int
-get_and_remove_first_entry_number (const char *name)
+get_and_remove_first_entry_number (grub_menu_t menu, const char *name)
{
const char *val;
char *tail;
int entry;
+ int sz = 0;
val = grub_env_get (name);
if (! val)
@@ -182,9 +207,39 @@ get_and_remove_first_entry_number (const char *name)
entry = (int) grub_strtoul (val, &tail, 0);
+ if (grub_errno == GRUB_ERR_BAD_NUMBER)
+ {
+ /* See if the variable matches the title of a menu entry. */
+ grub_menu_entry_t e = menu->entry_list;
+ int i;
+
+ for (i = 0; e; i++)
+ {
+ sz = menuentry_eq (e->title, val);
+ if (sz < 1)
+ sz = menuentry_eq (e->id, val);
+
+ if (sz >= 1)
+ {
+ entry = i;
+ break;
+ }
+ e = e->next;
+ }
+
+ if (sz > 0)
+ grub_errno = GRUB_ERR_NONE;
+
+ if (! e)
+ entry = -1;
+ }
+
if (grub_errno == GRUB_ERR_NONE)
{
- /* Skip whitespace to find the next digit. */
+ if (sz > 0)
+ tail += sz;
+
+ /* Skip whitespace to find the next entry. */
while (*tail && grub_isspace (*tail))
tail++;
grub_env_set (name, tail);
@@ -347,7 +402,7 @@ grub_menu_execute_with_fallback (grub_menu_t menu,
grub_menu_execute_entry (entry, 1);
/* Deal with fallback entries. */
- while ((fallback_entry = get_and_remove_first_entry_number ("fallback"))
+ while ((fallback_entry = get_and_remove_first_entry_number (menu, "fallback"))
>= 0)
{
grub_print_error ();
@@ -465,30 +520,6 @@ grub_menu_register_viewer (struct grub_menu_viewer *viewer)
viewers = viewer;
}
-static int
-menuentry_eq (const char *id, const char *spec)
-{
- const char *ptr1, *ptr2;
- ptr1 = id;
- ptr2 = spec;
- while (1)
- {
- if (*ptr2 == '>' && ptr2[1] != '>' && *ptr1 == 0)
- return 1;
- if (*ptr2 == '>' && ptr2[1] != '>')
- return 0;
- if (*ptr2 == '>')
- ptr2++;
- if (*ptr1 != *ptr2)
- return 0;
- if (*ptr1 == 0)
- return 1;
- ptr1++;
- ptr2++;
- }
-}
-
-
/* Get the entry number from the variable NAME. */
static int
get_entry_number (grub_menu_t menu, const char *name)