[bug#27661] ISO-9660 image working and ready

[Danny Milosavljevic]

Debugging:

$ qemu-system-x86_64 -bios $(guix build ovmf)/share/firmware/ovmf_x64.bin -m 1G 
-enable-kvm -hda Zuefi -serial stdio

Then add "console=ttyS0" to Linux cmdline in grub menu edit.

I get:

[    0.923605] scsi 0:0:0:0: Direct-Access     ATA      QEMU HARDDISK    2.5+ 
PQ: 0 ANSI: 5
[    0.926558] sd 0:0:0:0: [sda] 2215580 512-byte logical blocks: (1.13 GB/1.06 
GiB)
[    0.928683] sd 0:0:0:0: [sda] Write Protect is off
[    0.930155] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    0.931705] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, 
doesn't support DPO or FUA
[    0.934772] scsi 1:0:0:0: CD-ROM            QEMU     QEMU DVD-ROM     2.5+ 
PQ: 0 ANSI: 5
[    0.949039] sr 1:0:0:0: [sr0] scsi3-mmc drive: 4x/4x cd/rw xa/form2 tray
[    0.952674] cdrom: Uniform CD-ROM driver Revision: 3.20
[    0.955449]  sda: sda1 sda2 sda3 sda4
[    0.956995] sd 0:0:0:0: [sda] Attached SCSI disk
[    0.959031] sr 1:0:0:0: Attached scsi generic sg1 type 5
GC Warning: Couldn't read /proc/stat
Welcome, this is GNU's early boot Guile.
Use '--repl' for an initrd REPL.
loading '/gnu/store/48d1w55iy2vpcm5ass5lsp8almghszv8-system/boot'...
[    1.235733] attempt to access beyond end of device
[    1.237066] sda1: rw=0, want=949216, limit=76376
[    1.238565] attempt to access beyond end of device
[    1.240115] sda1: rw=0, want=949216, limit=76376
[    1.242095] attempt to access beyond end of device
[    1.243545] sda1: rw=0, want=949216, limit=76376
ERROR: In procedure primitive-load:
ERROR: In procedure fport_fill_input: Input/output error

Partitions are:

Disk Zuefi: 1.1 GiB, 1134376960 bytes, 2215580 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: DB26D0AA-65F4-4CE1-87F8-85CAD51B5C94

Device       Start     End Sectors  Size Type
Zuefi1          64   76439   76376 37.3M Microsoft basic data <----- here is a 
suspect
Zuefi2       76440   82199    5760  2.8M EFI System
Zuefi3       82200 2214931 2132732    1G Apple HFS/HFS+
Zuefi4     2214932 2215531     600  300K Microsoft basic data

Backtrace:

Impossible.  It did not actually enter the prompt.