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 \`$keeper'"
  44   exit 1
  45 fi
  46
  47 ## Make sure that there aren't recovery keys which would be orphaned by
  48 ## deleting this keeper set.  Also, build a data structure of recovery keys
  49 ## and their instances: `$recov' is a space-separated list of recovery key
  50 ## labels, and for each such label R, `$ri_R' is a space-separated list of
  51 ## its instances.
  52 unset deps; recov=" "
  53 if [ -d $KEYS/recov ]; then
  54   cd $KEYS/recov
  55
  56   ## Work through the available recovery keys.
  57   for r in *; do
  58     if ! expr >/dev/null "Q$r" : "Q$R_WORD"; then continue; fi
  59     if [ ! -l $r/current ]; then continue; fi
  60
  61     ## Add the key to our list.
  62     recov="$recov$r "
  63
  64     ## Now work through the instances.
  65     ii=""
  66     for ri in $r/*; do
  67       i=${ri#*/}
  68       case "$i" in *[!0-9]*) continue ;; esac
  69
  70       ## Add the instance to our list.
  71       ii="$ii $i"
  72
  73       ## For each recovery key, make sure that: either it doesn't depend on
  74       ## this keeper set, or it also depends on at least one other set.  If
  75       ## not, add it to the `deps' list.
  76       this=nil others=nil
  77       for kp in $ri/*.param; do
  78         k=${kp##*/}; k=${k%.param}
  79         case $k in $keeper) this=t ;; *) others=t ;; esac
  80       done
  81       case $this,$others in t,nil) deps="$deps $ri" ;; esac
  82     done
  83
  84     ## Record the list of instances.
  85     eval "ri_$r=\$ii"
  86   done
  87 fi
  88
  89 ## If we found any hard dependencies, report a failure.
  90 case "${deps+t}" in
  91   t)
  92     echo >&2 "$quis: deleting keeper \`$keeper' would orphan recovery keys:"
  93     for d in $deps; do echo 2>&1 "      $d"; done
  94     exit 1
  95     ;;
  96 esac
  97
  98 ## Disentangle the dependent recovery keys from this keeper set.
  99 for r in $recov; do
 100
 101   ## Remove the keeper data from the key's instances.
 102   eval "ii=\$ri_$r"
 103   for i in $ii; do rm -f $r/$i/$keeper.*; done
 104
 105   ## Work through the current keepers, and remove our keeper's name from the
 106   ## list.
 107   changep=nil
 108   while read k rest; do
 109     case $k in $keeper) changep=t ;; *) echo "$k $rest" ;; esac
 110   done <$r/keepers >$r/keepers.new
 111   case $changep in
 112     t) mv $r/keepers.new $r/keepers ;;
 113     nil) rm $r/keepers.new ;;
 114   esac
 115 done
 116
 117 ## Finally, actually delete the keeper keys.
 118 cd $KEYS/keeper
 119 rm -r $keeper
 120
 121 ###----- That's all, folks --------------------------------------------------