1 #!/bin/sh 2 3 set -e 4 5 MAX_TIMEOUT_SECONDS=300 6 7 usage() { 8 echo "$0 <mount point> <timeout seconds>" 9 exit 1 10 } 11 12 # Get the size of the filesystem mounted at $1, in bytes. 13 get_mount_size_bytes() { 14 local mount_point="$1" 15 16 # Filesystem 1024-blocks Used Available Capacity Mounted on 17 # /dev/mapper/encstateful 290968 47492 243476 17% /var 18 # 19 # awk uses double-representation internally; we'll hit problems if 20 # the filesystem has more than 2^53 bytes (8 petabytes). 21 df -P "$mount_point" | 22 awk '($6 == "'"$mount_point"'") { printf "%.0f", $2*1024; exit }' 23 } 24 25 if [ $# -ne 2 ]; then 26 usage 27 fi 28 29 mount_point="$1" 30 timeout_seconds="$2" 31 32 if [ "$timeout_seconds" -gt $MAX_TIMEOUT_SECONDS ]; then 33 echo "max timeout is "$MAX_TIMEOUT_SECONDS" seconds"; 34 exit 1 35 fi 36 37 mount_size_bytes=$(get_mount_size_bytes /var) 38 temp_file=$(mktemp --tmpdir="$mount_point" hog_disk.XXXXXXXXXX) 39 trap 'rm -f "$temp_file"' EXIT 40 trap 'exit' HUP INT QUIT TERM 41 42 for i in $(seq 1 $(( timeout_seconds * 10 ))); do 43 fallocate --length "$mount_size_bytes" "$temp_file" 2>/dev/null || true 44 sleep 0.1 45 done 46
