Pass -t to mount() call when filesystem type is known or can be determined

[rajibade]

This allows mounting not to depend on probe order, on libblkid's result or on whether the device happens to be mounted elsewhere already.

Fixes #3093

[rajibade]

Since this is technically a fix to a race condition, trying to run builds consecutively, might not yield much. I wrote this script to test this out. Needs util-linux v2.42 and udevd is active

#!/bin/bash

truncate -s 256M esp.img
sgdisk -n 1:0:+100M -c 1:p.UEFI esp.img
losetup -P /dev/loop0 esp.img
udevadm settle

udevadm control --stop-exec-queue
mkfs.vfat -F 16 /dev/loop0p1
mkdir -p /mnt/a /mnt/b

python3 -c "
from kiwi.mount_manager import MountManager
MountManager(device='/dev/loop0p1', mountpoint='/mnt/a').mount()
MountManager(device='/dev/loop0p1', mountpoint='/mnt/b').mount()
print('second mount ok')
"

udevadm control --start-exec-queue
umount /mnt/b /mnt/a
losetup -d /dev/loop0
rm esp.img

Without patch

sudo ./mount-type.sh
...
[ DEBUG   ]: 11:14:56 | EXEC: [mount /dev/loop0p1 /mnt/b]
[ DEBUG   ]: 11:14:56 | EXEC: Failed with stderr: mount: /mnt/b: fsconfig() failed: /dev/loop0p1: Can't open blockdev.
       dmesg(1) may have more information after failed mount system call.
, stdout: (no output on stdout)
Traceback (most recent call last):
  File "<string>", line 4, in <module>
    MountManager(device='/dev/loop0p1', mountpoint='/mnt/b').mount()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.14/site-packages/kiwi/mount_manager.py", line 127, in mount
    Command.run(
    ~~~~~~~~~~~^
        ['mount'] + type_list + option_list + [self.device, self.mountpoint]
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3.14/site-packages/kiwi/command.py", line 160, in run
    raise KiwiCommandError(
    ...<3 lines>...
    )
kiwi.exceptions.KiwiCommandError: mount: stderr: mount: /mnt/b: fsconfig() failed: /dev/loop0p1: Can't open blockdev.
       dmesg(1) may have more information after failed mount system call.
, stdout: (no output on stdout)
umount: /mnt/b: not mounted.

With patch

sudo ./mount-type.sh
Creating new GPT entries in memory.
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)
[ DEBUG   ]: 11:24:13 | Creating directory /mnt/a
[ DEBUG   ]: 11:24:13 | Looking for mountpoint in /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/var/lib/snapd/snap/bin
[ DEBUG   ]: 11:24:13 | EXEC: [mountpoint -q /mnt/a]
[ DEBUG   ]: 11:24:13 | Looking for blkid in /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/var/lib/snapd/snap/bin
[ DEBUG   ]: 11:24:13 | EXEC: [blkid /dev/loop0p1 -s TYPE -o value]
[ DEBUG   ]: 11:24:13 | Looking for mount in /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/var/lib/snapd/snap/bin
[ DEBUG   ]: 11:24:13 | EXEC: [mount -t vfat /dev/loop0p1 /mnt/a]
[ DEBUG   ]: 11:24:13 | Creating directory /mnt/b
[ DEBUG   ]: 11:24:13 | Looking for mountpoint in /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/var/lib/snapd/snap/bin
[ DEBUG   ]: 11:24:13 | EXEC: [mountpoint -q /mnt/b]
[ DEBUG   ]: 11:24:13 | Looking for blkid in /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/var/lib/snapd/snap/bin
[ DEBUG   ]: 11:24:13 | EXEC: [blkid /dev/loop0p1 -s TYPE -o value]
[ DEBUG   ]: 11:24:13 | Looking for mount in /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/var/lib/snapd/snap/bin
[ DEBUG   ]: 11:24:13 | EXEC: [mount -t vfat /dev/loop0p1 /mnt/b]
second mount ok

[rajibade]

@schaefi I think this is good. For testing, I think f45/rawhide is the only one affected at the moment.