mdw@git.distorted.org.uk Git - distorted-keys/blob - keys.delete-keeper

   1 #! /bin/sh
   2 ###
   3 ### Delete a keeper set
   4 ###
   5 ### (c) 2012 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of the distorted.org.uk key management suite.
  11 ###
  12 ### distorted-keys is free software; you can redistribute it and/or modify
  13 ### it under the terms of the GNU General Public License as published by
  14 ### the Free Software Foundation; either version 2 of the License, or
  15 ### (at your option) any later version.
  16 ###
  17 ### distorted-keys is distributed in the hope that it will be useful,
  18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ### GNU General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU General Public License
  23 ### along with distorted-keys; if not, write to the Free Software Foundation,
  24 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 set -e
  27 case "${KEYSLIB+t}" in t) ;; *) echo >&2 "$0: KEYSLIB unset"; exit 1 ;; esac
  28 . "$KEYSLIB"/keyfunc.sh
  29
  30 defhelp <<HELP
  31 KEEPER
  32 Delete the keeper set named KEEPER.
  33 HELP
  34
  35 ## Parse the command line.
  36 case $# in 1) ;; *) usage_err ;; esac
  37 keeper=$1
  38 checkword "keeper set label" "$keeper"
  39
  40 ## Check that the set actually exists.
  41 cd $KEYS/keeper
  42 if [ ! -d $keeper ]; then
  43   echo >&2 "$quis: unknown keeper set \`$keeper'"
  44   exit 1
  45 fi
  46
  47 ## Make sure that there aren't recovery keys which would be orphaned by
  48 ## deleting this keeper set.
  49 unset deps
  50 if [ -d $KEYS/recov ]; then
  51   cd $KEYS/recov
  52
  53   ## Work through the available recovery keys.
  54   for r in $(find . -type l -name current -print); do
  55     r=${r#./}; r=${r%/current}
  56     if ! expr >/dev/null "Q$r" : "Q$R_LABEL"; then continue; fi
  57
  58     ## Now work through the instances.
  59     for ri in $r/*; do
  60       i=${ri##*/}
  61       case "$i" in *[!0-9]*) continue ;; esac
  62
  63       ## For each recovery key, make sure that: either it doesn't depend on
  64       ## this keeper set, or it also depends on at least one other set.  If
  65       ## not, add it to the `deps' list.
  66       this=nil others=nil
  67       for kp in $r/current/*.param; do
  68         k=${kp##*/}; k=${k%.param}
  69         case $k in $keeper) this=t ;; *) others=t ;; esac
  70       done
  71       case $this,$others in t,nil) deps="$deps $ri" ;; esac
  72     done
  73   done
  74 fi
  75
  76 ## If we found any hard dependencies, report a failure.
  77 case "${deps+t}" in
  78   t)
  79     echo >&2 "$quis: deleting keeper \`$keeper' would orphan recovery keys:"
  80     for d in $deps; do echo 2>&1 "      $d"; done
  81     exit 1
  82     ;;
  83 esac
  84
  85 ## Disentangle the dependent recovery keys from this keeper set.
  86 if [ -d $KEYS/recov ]; then
  87   cd $KEYS/recov
  88
  89   ## Work through the recovery keys again.
  90   for r in $(find . -type l -name current -print); do
  91     r=${r#./}; r=${r%/current}
  92     if ! expr >/dev/null "Q$r" : "Q$R_LABEL"; then continue; fi
  93
  94     ## Remove the keeper data from the key's instances.
  95     for ri in $i/*; do
  96       i=${ri##*/}
  97       case "$i" in *[!0-9]*) continue ;; esac
  98       rm -f $ri/$keeper.*
  99     done
 100
 101     ## Work through the current keepers, and remove our keeper's name from
 102     ## the list.
 103     changep=nil
 104     while read k rest; do
 105       case $k in $keeper) changep=t ;; *) echo "$k $rest" ;; esac
 106     done <$r/keepers >$r/keepers.new
 107     case $changep in
 108       t) mv $r/keepers.new $r/keepers ;;
 109       nil) rm $r/keepers.new ;;
 110     esac
 111   done
 112 fi
 113
 114 ## Finally, actually delete the keeper keys.
 115 cd $KEYS/keeper
 116 rm -r $keeper
 117
 118 ###----- That's all, folks --------------------------------------------------