bsdinstall(8): Fix GPT label conflicts with disks not managed by us #1735
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Signed-off-by: Phil Krylov <phil@krylov.eu>
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When doing a ZFS install on a machine having another installation made by bsdinstall(8), with GPT labels kept as
efiboot0,gptboot0,boot0,zfs0, orswap0, bsdinstall(8) creates conflicting GPT labels and calls newfs_msdos(8) on existinggpt/efiboot0device from unmanaged disk.This patch checks for potential GPT label conflicts and prevents them by adjusting the numeric index to an unused value.