test: lock device during running cryptsetup

On running cryptsetup, udevd detects two inotify events for the
underlying device. Running the test on enough fast host, the expected
symlinks based on UUID and disk label are created by the second event.

During processing a uevent for a device, udevd disables the inotify
watch for the device. If the test runs on slow system, the second
inotify event may comes during a udev worker processing the synthesized
uevent triggered by the first inotify event. Hence, no synthesized
uevent for the second inotify event will be generated, and the expected
symlinks will be never created.

To prevent the issue, we need to lock the device during cryptsetup
command is running.

Fixes #32913.

Author: yuwata

test/units/TEST-64-UDEV-STORAGE.sh

@@ -787,9 +787,10 @@ EOF
     for ((i = 0; i < ${#devices[@]}; i++)); do
         # Intentionally use weaker cipher-related settings, since we don't care
         # about security here as it's a throwaway LUKS partition
-        cryptsetup luksFormat -q \
-            --use-urandom --pbkdf pbkdf2 --pbkdf-force-iterations 1000 \
-            --uuid "deadbeef-dead-dead-beef-11111111111$i" --label "encdisk$i" "${devices[$i]}" /etc/btrfs_keyfile
+        udevadm lock --device="${devices[$i]}" \
+                cryptsetup luksFormat -q \
+                --use-urandom --pbkdf pbkdf2 --pbkdf-force-iterations 1000 \
+                --uuid "deadbeef-dead-dead-beef-11111111111$i" --label "encdisk$i" "${devices[$i]}" /etc/btrfs_keyfile
         udevadm wait --settle --timeout=30 "/dev/disk/by-uuid/deadbeef-dead-dead-beef-11111111111$i" "/dev/disk/by-label/encdisk$i"
         # Add the device into /etc/crypttab, reload systemd, and then activate
         # the device so we can create a filesystem on it later