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	dreadlock-ng.sh - dreadlock-ng - Remote locking daemon with a funny name.
	git clone git://bitreich.org/dreadlock-ng git://enlrupgkhuxnvlhsf6lc3fziv5h2hhf…
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	---
	dreadlock-ng.sh (2176B)
	---
	1 #!/bin/bash
	2 #
	3 # Copy me, if you can.
	4 # by 20h
	5 #
	6
	7 #set -x
	8
	9 lockbasepath="/tmp/dreadlock-ng"
	10 if [ $# -gt 0 ];
	11 then
	12 lockbasepath="$1"
	13 fi
	14
	15 mkdir -p "${lockbasepath}"
	16
	17 declare -A locks=()
	18
	19 function unlock_on_disconnect() {
	20 for lockfd in ${locks[@]};
	21 do
	22 flock -u "${lockfd}" 2>/dev/null
	23 done
	24 for lockname in ${!locks[@]};
	25 do
	26 [ -e "${lockbasepath}/${lockname}" ] && rm -f "${lockbas…
	27 done
	28 }
	29
	30 trap unlock_on_disconnect EXIT
	31 trap unlock_on_disconnect 1
	32 trap unlock_on_disconnect 2
	33 trap unlock_on_disconnect 3
	34 trap unlock_on_disconnect 6
	35 trap unlock_on_disconnect 9
	36 trap unlock_on_disconnect 15
	37
	38 while read -r line;
	39 do
	40 case "${line}" in
	41 "lock "*)
	42 lockname="$(printf "%s\n" "${line}" \| tr -d $'\r' \| cut …
	43 if [ -z "${lockname}" ];
	44 then
	45 printf "e no lock name specified\r\n"
	46 exit 1;
	47 fi
	48 if [[ "${lockname}" =~ [^a-zA-Z0-9] ]];
	49 then
	50 printf "e lock name must be alphanumeric\r\n"
	51 exit 1
	52 fi
	53 timeoutms="$(printf "%s\n" "${line}" \| tr -d $'\r' \| cut…
	54 if [ -z "${timeoutms}" ];
	55 then
	56 printf "e no timeout specified\r\n"
	57 exit 1;
	58 fi
	59 if [[ "${timeoutms}" =~ [^0-9] ]];
	60 then
	61 printf "e timeout must be numeric\r\n"
	62 exit 1
	63 fi
	64 timeouts="$(units -t "${timeoutms}ms" "s" 2>/dev/null)"
	65 case "${timeouts}" in
	66 0*)
	67 # flock(1) needs at least one second.
	68 timeouts=1
	69 ;;
	70 esac
	71
	72 lockpath="${lockbasepath}/${lockname}"
	73 touch "${lockpath}"
	74 exec {fd}<>"${lockpath}"
	75 flock -x -w "${timeouts}" "${fd}"
	76 if [ $? -gt 0 ];
	77 then
	78 printf "t timeout\r\n"
	79 exit 1
	80 fi
	81 locks[${lockname}]+="${fd}"
	82 printf "l locked\r\n"
	83 ;;
	84 "unlock "*)
	85 lockname="$(printf "%s\n" "${line}" \| tr -d $'\r' \| cut …
	86 if [ -z "${lockname}" ];
	87 then
	88 printf "e no lock name specified\r\n"
	89 exit 1;
	90 fi
	91 if [[ "${lockname}" =~ [^a-zA-Z0-9] ]];
	92 then
	93 printf "e lock name must be alphanumeric\r\n"
	94 exit 1
	95 fi
	96
	97 lockfd=${locks[${lockname}]}
	98 if [ -z "${lockfd}" ];
	99 then
	100 printf "e unknown lock\r\n"
	101 exit 1
	102 fi
	103
	104 flock -u "${lockfd}"
	105 if [ $? -gt 1 ];
	106 then
	107 printf "e unlock error\r\n"
	108 exit 1
	109 fi
	110 printf "u unlocked\r\n"
	111 ;;
	112 *)
	113 exit 1;
	114 esac
	115 done
	116
	117 exit 0
	118