[Bug 287904] Most recent installer fails to flush pre-existing GPT labels

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287904

--- Comment #1 from Dennis Clarke <dclarke@blastwave.org> ---

Hacky way to deal with this is to re-boot the disk1.iso and then drop 
into a single user shell and wreck the disk data :

Enter full pathname of shell or RETURN for /bin/sh: 
root@:/ # 
root@:/ # gpart destroy -F /dev/ada0
ada0 destroyed
root@:/ # gpart destroy -F /dev/ada1
ada1 destroyed
root@:/ # 
root@:/ # dd if=/dev/zero of=/dev/ada0 bs=65536 count=1024 status=progress

1024+0 records in
1024+0 records out
67108864 bytes transferred in 0.882265 secs (76064266 bytes/sec)
root@:/ # 
root@:/ # dd if=/dev/zero of=/dev/ada1 bs=65536 count=1024 status=progress

1024+0 records in
1024+0 records out
67108864 bytes transferred in 0.820492 secs (81791022 bytes/sec)
root@:/ # 


Then start over from scratch and re-install :

 FreeBSD Installer
 ──────────────────────────────────────────────────────────────────────────────
 ┌────────────────────────────┤ZFS Configuration├────────────────────────────┐
 │ Configure Options:                                                        │
 │ ┌───────────────────────────────────────────────────────────────────────┐ │
 │ │ >>> Install         Proceed with Installation                         │ │
 │ │ T Pool Type/Disks:  mirror: 2 disks                                   │ │
 │ │ - Rescan Devices    *                                                 │ │
 │ │ - Disk Info         *                                                 │ │
 │ │ N Pool Name         zroot                                             │ │
 │ │ 4 Force 4K Sectors? YES                                               │ │
 │ │ E Encrypt Disks?    NO                                                │ │
 │ │ P Partition Scheme  GPT (BIOS+UEFI)                                   │ │
 │ │ S Swap Size         16g                                               │ │
 │ │ M Mirror Swap?      YES                                               │ │
 │ │ W Encrypt Swap?     NO                                                │ │
 │ │ O ZFS Pool Options  -O compress=zstd -O atime=off -O checksum=sha512  │ │
 │ └───────────────────────────────────────────────────────────────────────┘


 I do not trust this : 

              ┌───────────────┤ZFS Configuration├──────────────┐
              │ Last Chance! Are you sure you want to destroy  │  
              │ the current contents of the following disks:   │  
              │                                                │  
              │  ada0 ada1                                     │  
              │                                                │  
              ├────────────────────────────────────────────────┤  
              │              [ YES  ]     [  NO  ]             │  
              └────────── Press arrows, TAB or ENTER ──────────┘  


Well turns out this does not work either : 

GEOM_MIRROR: Device mirror/efiboot launched (2/2).
GEOM_MIRROR: Device mirror/swap launched (2/2).
uhub5: 4 ports with 4 removable, self powered
ugen0.3: <Generic USB2.0-CRW> at usbus0
Root mount waiting for: usbus0
ugen0.4: <VIA Labs, Inc. USB Hub> at usbus0
uhub6 numa-domain 0 on uhub0
uhub6: <VIA Labs, Inc. USB Hub, class 9/0, rev 3.00/53.55, addr 3> on usbus0
Root mount waiting for: usbus0
uhub6: 4 ports with 4 removable, self powered
Setting hostuuid: 24cb90f5-4f5d-e511-9f83-6c0b840c5fc6.
Setting hostid: 0xe4e141e6.
Starting file system checks:
Can't open `/dev/gpt/efiboot0'
/dev/gpt/efiboot0: UNEXPECTED INCONSISTENCY; RUN fsck_msdosfs MANUALLY.
THE FOLLOWING FILE SYSTEM HAD AN UNEXPECTED INCONSISTENCY:
        msdosfs: /dev/gpt/efiboot0 (/boot/efi)
Automatic file system check failed; help!
ERROR: ABORTING BOOT (sending SIGTERM to parent)!
2025-06-29T18:03:07.208632+00:00 - init 1 - - /bin/sh on /etc/rc terminated
abnormally, going to single user mode
Enter root password, or ^D to go multi-user
Password:
Enter full pathname of shell or RETURN for /bin/sh: 
root@:/ #

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