Race condition: auto-mounting getting in the way

[teohhanhui]

root@Han-MacBook-Air:/home/teohhanhui/Projects/leifliddy/asahi-fedora-usb# ./build.sh -d /dev/sda
### Preparing USB device
GPT fdisk (gdisk) version 1.0.9

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): This option deletes all partitions and creates a new protective MBR.
Proceed? (Y/N): 
Command (? for help): Partition number (1-128, default 1): First sector (34-15148574, default = 2048) or {+-}size{KMGTP}: Last sector (2048-15148574, default = 15147007) or {+-}size{KMGTP}: Current type is 8300 (Linux filesystem)
Hex code or GUID (L to show codes, Enter = 8300): Changed type of partition to 'EFI system partition'

Command (? for help): Partition number (2-128, default 2): First sector (34-15148574, default = 1230848) or {+-}size{KMGTP}: Last sector (1230848-15148574, default = 15147007) or {+-}size{KMGTP}: Current type is 8300 (Linux filesystem)
Hex code or GUID (L to show codes, Enter = 8300): Changed type of partition to 'Linux filesystem'

Command (? for help): Partition number (3-128, default 3): First sector (34-15148574, default = 3328000) or {+-}size{KMGTP}: Last sector (3328000-15148574, default = 15147007) or {+-}size{KMGTP}: Current type is 8300 (Linux filesystem)
Hex code or GUID (L to show codes, Enter = 8300): Changed type of partition to 'Linux filesystem'

Command (? for help): 
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): OK; writing new GUID partition table (GPT) to /dev/sda.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot or after you
run partprobe(8) or kpartx(8)
The operation has completed successfully.
mkfs.fat 4.2 (2021-01-31)
mke2fs 1.47.0 (5-Feb-2023)
/dev/sda2 is mounted; will not make a filesystem here!
mke2fs 1.47.0 (5-Feb-2023)
The file /dev/sdap2 does not exist and no size was specified.

Looks like it fails on this line:

asahi-fedora-usb/build.sh

Line 162 in e8d0cf5

mkfs.ext4 -U $BOOT_UUID -L 'fedora-usb-boot' -F "$usb_device"2 || mkfs.ext4 -U $BOOT_UUID -L 'fedora-usb-boot' -F "$usb_device"p2

Because at that point auto mount has already won the race... 🤣

[teohhanhui]

Temporarily disabling auto mount works fine.