WSL1上でbuild.shがmountに失敗する

[tandasat]

mount -o loop ./disk.img ./mntが以下のように失敗します。

$ ./build.sh
make: Entering directory '/home/user/mikanos/kernel'
make: 'kernel.elf' is up to date.
make: Leaving directory '/home/user/mikanos/kernel'
make: Entering directory '/home/user/mikanos/apps/blocks'
make: 'blocks' is up to date.
make: Leaving directory '/home/user/mikanos/apps/blocks'
make: Entering directory '/home/user/mikanos/apps/cp'
make: 'cp' is up to date.
make: Leaving directory '/home/user/mikanos/apps/cp'
make: Entering directory '/home/user/mikanos/apps/cube'
make: 'cube' is up to date.
make: Leaving directory '/home/user/mikanos/apps/cube'
make: Entering directory '/home/user/mikanos/apps/dpage'
make: 'dpage' is up to date.
make: Leaving directory '/home/user/mikanos/apps/dpage'
make: Entering directory '/home/user/mikanos/apps/eye'
make: 'eye' is up to date.
make: Leaving directory '/home/user/mikanos/apps/eye'
make: Entering directory '/home/user/mikanos/apps/fault'
make: 'fault' is up to date.
make: Leaving directory '/home/user/mikanos/apps/fault'
make: Entering directory '/home/user/mikanos/apps/grep'
make: 'grep' is up to date.
make: Leaving directory '/home/user/mikanos/apps/grep'
make: Entering directory '/home/user/mikanos/apps/gview'
make: 'gview' is up to date.
make: Leaving directory '/home/user/mikanos/apps/gview'
make: Entering directory '/home/user/mikanos/apps/large'
make: 'large' is up to date.
make: Leaving directory '/home/user/mikanos/apps/large'
make: Entering directory '/home/user/mikanos/apps/lines'
make: 'lines' is up to date.
make: Leaving directory '/home/user/mikanos/apps/lines'
make: Entering directory '/home/user/mikanos/apps/mmap'
make: 'mmap' is up to date.
make: Leaving directory '/home/user/mikanos/apps/mmap'
make: Entering directory '/home/user/mikanos/apps/more'
make: 'more' is up to date.
make: Leaving directory '/home/user/mikanos/apps/more'
make: Entering directory '/home/user/mikanos/apps/onlyhlt'
make: 'onlyhlt' is up to date.
make: Leaving directory '/home/user/mikanos/apps/onlyhlt'
make: Entering directory '/home/user/mikanos/apps/paint'
make: 'paint' is up to date.
make: Leaving directory '/home/user/mikanos/apps/paint'
make: Entering directory '/home/user/mikanos/apps/readfile'
make: 'readfile' is up to date.
make: Leaving directory '/home/user/mikanos/apps/readfile'
make: Entering directory '/home/user/mikanos/apps/rpn'
make: 'rpn' is up to date.
make: Leaving directory '/home/user/mikanos/apps/rpn'
make: Entering directory '/home/user/mikanos/apps/sort'
make: 'sort' is up to date.
make: Leaving directory '/home/user/mikanos/apps/sort'
make: Entering directory '/home/user/mikanos/apps/stars'
make: 'stars' is up to date.
make: Leaving directory '/home/user/mikanos/apps/stars'
make: Entering directory '/home/user/mikanos/apps/timer'
make: 'timer' is up to date.
make: Leaving directory '/home/user/mikanos/apps/timer'
make: Entering directory '/home/user/mikanos/apps/tview'
make: 'tview' is up to date.
make: Leaving directory '/home/user/mikanos/apps/tview'
make: Entering directory '/home/user/mikanos/apps/winhello'
make: 'winhello' is up to date.
make: Leaving directory '/home/user/mikanos/apps/winhello'
make: Entering directory '/home/user/mikanos/apps/winjpn'
make: 'winjpn' is up to date.
make: Leaving directory '/home/user/mikanos/apps/winjpn'
+ dirname /home/user/osbook/devenv/make_mikanos_image.sh
+ DEVENV_DIR=/home/user/osbook/devenv
+ MOUNT_POINT=./mnt
+ [ ./disk.img =  ]
+ [ /home/user/mikanos =  ]
+ LOADER_EFI=/home/user/edk2/Build/MikanLoaderX64/DEBUG_CLANG38/X64/Loader.efi
+ KERNEL_ELF=/home/user/mikanos/kernel/kernel.elf
+ /home/user/osbook/devenv/make_image.sh ./disk.img ./mnt /home/user/edk2/Build/MikanLoaderX64/DEBUG_CLANG38/X64/Loader.efi /home/user/mikanos/kernel/kernel.elf
+ [ 4 -lt 3 ]
+ dirname /home/user/osbook/devenv/make_image.sh
+ DEVENV_DIR=/home/user/osbook/devenv
+ DISK_IMG=./disk.img
+ MOUNT_POINT=./mnt
+ EFI_FILE=/home/user/edk2/Build/MikanLoaderX64/DEBUG_CLANG38/X64/Loader.efi
+ ANOTHER_FILE=/home/user/mikanos/kernel/kernel.elf
+ [ ! -f /home/user/edk2/Build/MikanLoaderX64/DEBUG_CLANG38/X64/Loader.efi ]
+ rm -f ./disk.img
+ qemu-img create -f raw ./disk.img 200M
Formatting './disk.img', fmt=raw size=209715200
+ mkfs.fat -n MIKAN OS -s 2 -f 2 -R 32 -F 32 ./disk.img
mkfs.fat 4.1 (2017-01-24)
+ /home/user/osbook/devenv/mount_image.sh ./disk.img ./mnt
+ [ 2 -lt 2 ]
+ dirname /home/user/osbook/devenv/mount_image.sh
+ DEVENV_DIR=/home/user/osbook/devenv
+ DISK_IMG=./disk.img
+ MOUNT_POINT=./mnt
+ [ ! -f ./disk.img ]
+ mkdir -p ./mnt
+ sudo mount -o loop ./disk.img ./mnt
mount: ./mnt: mount failed: Operation not permitted.

そもそも、WSL1ではloop deviceがないことが原因で、mountが十分に動作しないようです。
microsoft/WSL#131

あまり良い回避策は見つからず、私がみた範囲ではWSL2かLinuxを使うのが妥当そうです。

[uchan-nos]

@tandasat
WSL1 でマウントできないのはその通りです。
Mtool を使うとマウント不要でディスクイメージを操作できます。
参照 uchan-nos/os-from-zero#39