https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264090
Bug ID: 264090
Summary: gpart bootcode safety checks
Product: Base System
Version: Unspecified
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
gpart bootcode should at least check partition code before writing anything to
disk and abort operation if it's not freebsd-boot.
This is unfortunately based on true story... I had to upgrade couple of servers
which belong to our client. Those servers were installed using dual partition
scheme which puts freebsd-boot as a second partition after efi.
gpart bootcode -p /boot/gptzfsboot -b /boot/pmbr -i1 da0 happily wiped efi
partition (which on FreeBSD < 13.0 is not mounted) making servers unbootable. I
don't have access to console, so admin on another side has to deal with effects
of my muscle memory/incompetence. Considering that zpool upgrade, all
blog/forum posts (related to bootcode) mention '-i1' overwriting wrong
partition by accident is more than possible.
This issue (to some extent) might be related to bug #211503
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