[bug #50861] saved_entry is read from environment block without GRUB_DEFAULT=saved

[xuiqzy]

URL:
  <http://savannah.gnu.org/bugs/?50861>

                 Summary: saved_entry is read from environment block without
GRUB_DEFAULT=saved
                 Project: GNU GRUB
            Submitted by: xuiqzy
            Submitted on: Sun 23 Apr 2017 05:40:20 PM UTC
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: other
         Reproducibility: Every Time
         Planned Release: None

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Details:

On Grub 2.02~rc2, when setting the saved_entry variable for example with the
grub-reboot tool, the next boot this variable is read and the matching entry
is booted.

But this is done regardless of the setting of GRUB_DEFAULT, which should
control this setting according to the documentation. It's the same behavior
whether it's set to a specific menuentry or to 0 (as in the example below).

When generating the grub.cfg config file the following code is generated,
which is probably the problematic part:

if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="0"
fi





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