/usr/lib/os-probes/10zvol-test is in zfsutils-linux 0.7.5-1ubuntu15.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/bin/sh
# Sub-test to exclude ZVOLs
set -e
partition="$1"
. /usr/share/os-prober/common.sh
if [ "$(stat -L -c %t "$partition")" = "e6" ] ; then
debug "$1 is a ZVOL; skipping"
exit 0
fi
# No ZVOLs found
exit 1
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