functions/lockfile.sh

   1 #!/bin/sh
   2
   3 ## live-build(7) - System Build Scripts
   4 ## Copyright (C) 2006-2013 Daniel Baumann <mail@daniel-baumann.ch>
   5 ##
   6 ## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
   7 ## This is free software, and you are welcome to redistribute it
   8 ## under certain conditions; see COPYING for details.
   9
  10
  11 Check_lockfile ()
  12 {
  13         FILE="${1}"
  14
  15         if [ -z "${FILE}" ]
  16         then
  17                 FILE="/var/lock/${PROGRAM}.lock"
  18         fi
  19
  20         # Checking lock file
  21         if [ -f "${FILE}" ]
  22         then
  23                 Echo_error "${PROGRAM} locked"
  24                 exit 1
  25         fi
  26 }
  27
  28 Create_lockfile ()
  29 {
  30         FILE="${1}"
  31
  32         if [ -z "${FILE}" ]
  33         then
  34                 FILE="/var/lock/${PROGRAM}.lock"
  35         fi
  36
  37         DIRECTORY="$(dirname ${FILE})"
  38
  39         # Creating lock directory
  40         mkdir -p "${DIRECTORY}"
  41
  42         # Creating lock trap
  43         trap 'ret=${?}; '"rm -f \"${FILE}\";"' exit ${ret}' EXIT HUP INT QUIT TERM
  44
  45         # Creating lock file
  46         touch "${FILE}"
  47 }