[Bug 243997] bsdinstall should not format EFI partition

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243997

            Bug ID: 243997
           Summary: bsdinstall should not format EFI partition
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: markand at malikania.fr

Hi,

FreeBSD makes a bit complicated to dual boot an UEFI install when using the
bsdinstall partition tool.

Even though you don't modify the EFI partition (if already existing) FreeBSD
will format it and therefore losing all your previous systems EFI loaders.

The script should not format the EFI partition and use it if already existing
or propose the user to create one if not found.

Steps to reproduce:

1. Install any operating system that is not FreeBSD with a EFI partition
2. Boot FreeBSD installer
3. Create a freebsd-ufs partition (do not use auto partitioning!)
4. Install will format the EFI partition and you lose all your data on it.

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