scripts/edit-sa-prefs

   1 #!/bin/sh
   2 # Copyright (C) 2014, Eric Wong <e@80x24.org>
   3 # License: GPLv3 or later <http://www.gnu.org/licenses/gpl-3.0.txt>
   4 # edit and atomically update ~/.spamasassin/user_prefs safely
   5 set -e
   6 cd ~/.spamassassin
   7 cp user_prefs user_prefs.edit.$$ # don't care if we clobber old files
   8
   9 # non-blocking lock
  10 if ! ln user_prefs.edit.$$ user_prefs.edit
  11 then
  12         rm user_prefs.edit.$$
  13         echo >&2 "we are already editing user_prefs.edit"
  14         exit 1
  15 fi
  16
  17 rm user_prefs.edit.$$
  18
  19 ${VISUAL-vi} user_prefs.edit
  20
  21 if diff -u user_prefs user_prefs.edit
  22 then
  23         rm -f user_prefs.edit
  24         echo 'no changes'
  25         exit 0
  26 fi
  27
  28 # check until we're good or $EDITOR fails
  29 while ! spamassassin -p user_prefs.edit --lint
  30 do
  31         echo >&2 "respawning editor, press Enter to continue"
  32         read ignored_var
  33         ${VISUAL-vi} user_prefs.edit
  34 done
  35
  36 # atomically replace user_prefs
  37 mv user_prefs.edit user_prefs
  38 echo '~/.spamassassin/user_prefs updated'