/usr/lib/os-probes/50mounted-tests uses /var as a temporary directory

Binary package hint: os-prober

Apart from the fact that os-prober installs itself under the "/usr" hierarchy, thus making it useless to be run in environments where /usr, /var are separate partitions, it also uses the /var directory as a container for temporary mount-points!!!

file: /usr/lib/os-probes/50mounted-tests

 43 tmpmnt=/var/lib/os-prober/mount
 44 if [ ! -d "$tmpmnt" ]; then
 45 mkdir "$tmpmnt"
 46 fi
 47
 48 for type in $types $delaytypes; do
 49 if mount -o ro -t "$type" "$partition" "$tmpmnt" 2>/dev/null; then
 50 debug "mounted as $type filesystem"
 51 for test in /usr/lib/os-probes/mounted/*; do
 52 debug "running subtest $test"
 53 if [ -f "$test" ] && [ -x "$test" ]; then
 54 if "$test" "$partition" "$tmpmnt" "$type"; then
 55 debug "os found by subtest $test"
 56 if ! umount "$tmpmnt"; then
 57 warn "failed to umount $tmpmnt"
 58 fi
 59 rmdir "$tmpmnt" || true
 60 exit 0
 61 fi
 62 fi
 63 done
 64 if ! umount "$tmpmnt"; then
 65 warn "failed to umount $tmpmnt"
 66 fi
 67 break
 68 fi
 69 done
 70
 71 rmdir "$tmpmnt" || true

As I understand, we should use the "/tmp" directory for this purpose and lines 43-46 should read:

 43 tmpmnt=/tmp/os-prober/mount
 44 if [ ! -d "$tmpmnt" ]; then
 45 mkdir -p "$tmpmnt"
 46 fi

Use the "-p" option to mkdir to ensure intermediate directories are also created.