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mkfs: avoid blockdev failing to re-read partition table
Invoking `blockdev --rereadpt` straight after creating the file system might fail with: | blockdev: ioctl error on BLKRRPART: Device or resource busy | Unexpected non-zero exit code 1 in /sbin/grml-debootstrap /sbin/grml-debootstrap /sbin/grml-debootstrap at line 1376 2132 0 detected! | last bash command: blockdev --rereadpt "$main_device" This is caused by udev kicking in and causing a race condition. Let's invoke udevadm settle (which watches the udev event queue, and exits if all current events are handled), and then retry `blockdev --rereadpt ...` up to 30 times/seconds. Thanks: Darshaka Pathirana for bug report and initial investigation, and Chris Hofstaedtler for feedback Closes: #273
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