[Bug 201788] UEFI boot1.efi doesn't honor GPT bootme/bootonce flags

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201788

--- Comment #7 from Jose Luis Duran <jlduran@FreeBSD.org> ---
Just as a matter of documentation. The bootcode that should be used is
gptboot.efi(8).
Take this hypothetical NanoBSD image:

# gpart show -l
=>     34  7999933  vtbd0  GPT  (3.8G)
       34        6         - free -  (3.0K)
       40      121      1  gptboot0  (61K)
      161     1887         - free -  (944K)
     2048   532480      2  efiboot0  (260M)
   534528   532480      3  efiboot1  (260M)
  1067008   532480      4  efiboot2  (260M)
  1599488  3198976      5  code1  (1.5G)
  4798464  3198976      6  code2  (1.5G)
  7997440     2048      7  cfg  (1.0M)
  7999488      479         - free -  (240K)

We'll just use efiboot0 (vtbd0p2). The partition vtbd0p2 has:

# mount_msdosfs /dev/gpt/efiboot0 /mnt
# ls -R /mnt
EFI

/mnt/EFI:
BOOT

/mnt/EFI/BOOT:
BOOTX64.EFI

Where BOOTX64.EFI is /boot/gptboot.efi:

# sha256 -q /boot/gptboot.efi
21150c71a7a00075a76dde5eb65dc876570d5e7ea937dac061aee1358083a52e
# sha256 -q /mnt/EFI/BOOT/BOOTX64.EFI
21150c71a7a00075a76dde5eb65dc876570d5e7ea937dac061aee1358083a52e

Now, let's test the flags:

# df -h /
Filesystem        Size    Used   Avail Capacity  Mounted on
/dev/gpt/code1    1.5G    1.3G    241M    84%    /
# gpart set -a bootonce -i 6 vtbd0
bootonce set on vtbd0p6
# gpart show -l
=>     34  7999933  vtbd0  GPT  (3.8G)
       34        6         - free -  (3.0K)
       40      121      1  gptboot0  (61K)
      161     1887         - free -  (944K)
     2048   532480      2  efiboot0  (260M)
   534528   532480      3  efiboot1  (260M)
  1067008   532480      4  efiboot2  (260M)
  1599488  3198976      5  code1  (1.5G)
  4798464  3198976      6  code2  [bootonce,bootme]  (1.5G)
  7997440     2048      7  cfg  (1.0M)
  7999488      479         - free -  (240K)

Let's restart and see if it boots from code2:

# shutdown -r now
...
# df -h /
Filesystem        Size    Used   Avail Capacity  Mounted on
/dev/gpt/code2    1.5G    1.3G    241M    84%    /

It did! The /etc/rc.d/gptboot script also properly cleared the flags:

# gpart show -l
=>     34  7999933  vtbd0  GPT  (3.8G)
       34        6         - free -  (3.0K)
       40      121      1  gptboot0  (61K)
      161     1887         - free -  (944K)
     2048   532480      2  efiboot0  (260M)
   534528   532480      3  efiboot1  (260M)
  1067008   532480      4  efiboot2  (260M)
  1599488  3198976      5  code1  (1.5G)
  4798464  3198976      6  code2  (1.5G)
  7997440     2048      7  cfg  (1.0M)
  7999488      479         - free -  (240K)

Rebooting again should boot from code1:

# shutdown -r now
...
# df -h /
Filesystem        Size    Used   Avail Capacity  Mounted on
/dev/gpt/code1    1.5G    1.3G    241M    84%    /

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