[bug #56088] Side effects of setting variables are not undone after exiting a context in which they were set

[felix]

URL:
  <https://savannah.gnu.org/bugs/?56088>

                 Summary: Side effects of setting variables are not undone
after exiting a context in which they were set
                 Project: GNU GRUB
            Submitted by: felix_s
            Submitted on: Sat 06 Apr 2019 06:28:05 PM UTC
                Category: None
                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: 2.02
         Reproducibility: Every Time
         Planned Release: None

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Details:

Steps to reproduce:

0. Prepare a configuration file containing the line: set
color_normal=red/white
1. Launch GRUB command line.
1. Run: set color_normal=white/black
2. Load the file prepared in step 0 using configfile.
3. Run: echo $color_normal
4. Observe the red text 'white/black' was output on white background; the
variable value is inconsistent with the actually applied setting, which was
changed in an inner context.

This applies to any variable with side effects; color_normal is just the
easiest to demonstrate.

Expected result: Variable contents are consistent with applied settings.
Preferably by restoring the old setting upon exiting the context, which makes
all variables behave identically with respect to contexts.





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