displace.sh.in

   1 # displace.sh.in: diversion helpers for maintainer scripts
   2 #
   3 # displace_link <prefix> <suffix>
   4 #
   5 #   Ensures that the file <prefix><suffix> is properly diverted to
   6 #   <prefix>.divert-orig<suffix> by this package, and becomes a
   7 #   symbolic link to either <prefix>.divert<suffix> (default) or
   8 #   <prefix>.divert-orig<suffix>.
   9 #
  10 # undisplace_unlink <prefix> <suffix>
  11 #
  12 #   Undoes the action of displace_link <prefix> <suffix> specified
  13 #   above.
  14 #
  15 # Version: 4.0
  16 #
  17 # Copyright © 2008–2012 Tim Abbott <tabbott@mit.edu> and Anders
  18 # Kaseorg <andersk@mit.edu>
  19 #
  20 # Permission is hereby granted, free of charge, to any person
  21 # obtaining a copy of this software and associated documentation files
  22 # (the “Software”), to deal in the Software without restriction,
  23 # including without limitation the rights to use, copy, modify, merge,
  24 # publish, distribute, sublicense, and/or sell copies of the Software,
  25 # and to permit persons to whom the Software is furnished to do so,
  26 # subject to the following conditions:
  27 #
  28 # The above copyright notice and this permission notice shall be
  29 # included in all copies or substantial portions of the Software.
  30 #
  31 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
  32 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  35 # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  36 # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  37 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  38 # SOFTWARE.
  39 #
  40
  41 package=#PACKAGE#
  42
  43 ours=#DEB_DISPLACE_EXTENSION#
  44 theirs=#DEB_DISPLACE_EXTENSION#-orig
  45
  46 displace_link_displace()
  47 {
  48     file=$1
  49     ourfile=$2
  50     theirfile=$3
  51     if ! LC_ALL=C dpkg-divert --list "$package" | \
  52         grep -xFq "diversion of $file to $theirfile by $package"; then
  53         dpkg-divert --divert "$theirfile" --rename --package "$package" --add "$file"
  54     fi
  55 }
  56
  57 displace_link_symlink()
  58 {
  59     file=$1
  60     ourfile=$2
  61     theirfile=$3
  62     if [ ! -L "$file" ] && [ ! -e "$file" ]; then
  63         ln -s "$(basename "$ourfile")" "$file"
  64     elif [ ! -L "$file" ] || \
  65         [ "$(readlink "$file")" != "$(basename "$ourfile")" -a \
  66           "$(readlink "$file")" != "$(basename "$theirfile")" ]; then
  67         echo "*** OMINOUS WARNING ***: $file is not linked to either $(basename "$ourfile") or $(basename "$theirfile")" >&2
  68     fi
  69 }
  70
  71 displace_link()
  72 {
  73     prefix=$1
  74     suffix=$2
  75
  76     file=$prefix$suffix
  77     ourfile=$prefix$ours$suffix
  78     theirfile=$prefix$theirs$suffix
  79     displace_link_displace "$file" "$ourfile" "$theirfile"
  80     displace_link_symlink "$file" "$ourfile" "$theirfile"
  81 }
  82
  83 displace_hide()
  84 {
  85     file=$1
  86     ourfile=""
  87     theirfile=$2
  88     displace_link_displace "$file" "$ourfile" "$theirfile"
  89 }
  90
  91 undisplace_unlink_symlink()
  92 {
  93     file="$1"
  94     ourfile="$2"
  95     theirfile="$3"
  96     if [ ! -L "$file" ] || \
  97         [ "$(readlink "$file")" != "$(basename "$ourfile")" -a \
  98           "$(readlink "$file")" != "$(basename "$theirfile")" ]; then
  99         echo "*** OMINOUS WARNING ***: $file is not linked to either $(basename "$ourfile") or $(basename "$theirfile")" >&2
 100     else
 101         rm -f "$file"
 102     fi
 103 }
 104
 105 undisplace_unlink_displace()
 106 {
 107     file="$1"
 108     if [ ! -L "$file" ] && [ ! -e "$file" ]; then
 109         dpkg-divert --remove --rename --package "$package" "$file"
 110     else
 111         echo "Not removing diversion of $file by $package" >&2
 112     fi
 113 }
 114
 115 undisplace_unlink()
 116 {
 117     prefix=$1
 118     suffix=$2
 119
 120     file=$prefix$suffix
 121     ourfile=$prefix$ours$suffix
 122     theirfile=$prefix$theirs$suffix
 123
 124     undisplace_unlink_symlink "$file" "$ourfile" "$theirfile"
 125     undisplace_unlink_displace "$file"
 126 }
 127
 128 undisplace_unhide()
 129 {
 130     file=$1
 131     undisplace_unlink_displace "$file"
 132 }
 133
 134 check_undisplace_unlink()
 135 {
 136     prefix=$1
 137     suffix=$2
 138
 139     file=$prefix$suffix
 140     ourfile=$prefix$ours$suffix
 141     theirfile=$prefix$theirs$suffix
 142
 143     if LC_ALL=C dpkg-divert --list "$package" | \
 144         grep -xFq "diversion of $file to $theirfile by $package"; then
 145         undisplace_unlink "$prefix" "$suffix"
 146     fi
 147 }
 148
 149 check_undisplace_unhide()
 150 {
 151     file=$1
 152     hiddenfile=$2
 153     if LC_ALL=C dpkg-divert --list "$package" | \
 154         grep -xFq "diversion of $file to $hiddenfile by $package"; then
 155         undisplace_unhide "$file"
 156     fi
 157 }
 158
 159 # End of divert.sh.in