stdenv_prefix/prehook.sh

   1 count_chunks() {
   2   elements="${1//[^\/]}"
   3   echo $(( "${#elements}" ))
   4 }
   5
   6 oldout=$out
   7 prefix_chunks=$(count_chunks $NIX_STORE)
   8
   9 : ${storepath_length=${#NIX_STORE}}
  10 : ${storepath_chunks=$prefix_chunks}
  11
  12 if [ "$storepath_chunks" -lt $prefix_chunks ]; then
  13   echo "Need to have at least as much path elements as the initial prefix"
  14   exit 1
  15 fi
  16
  17 min_length=$(( ${#NIX_STORE} + 2 * $storepath_chunks - 2 * $prefix_chunks ))
  18 if [ "$storepath_length" -lt "$min_length" ]; then
  19   echo "The storepath length needs to be at least the length of the prefix"
  20   exit 1
  21 fi
  22
  23 if [ "$storepath_chunks" -eq "$prefix_chunks" -a "$storepath_length" -gt "$min_length" ]; then
  24   echo "You need at least one more chunk for a non-standard path length"
  25   exit 1
  26 fi
  27
  28 appendOut() {
  29   chunk_prefix=$(for (( c=$prefix_chunks ; c < $storepath_chunks ; c++ )); do echo -n "/x"; done)
  30   length_prefix=$(for (( c=$(( ${#NIX_STORE} + ${#chunk_prefix} )) ; c < $storepath_length ; c++ )); do echo -n "x"; done)
  31   out="$out$chunk_prefix$length_prefix"
  32   if [ -n $chunk_prefix -o -n $length_prefix ]; then
  33     mkdir -p $(dirname $out)
  34   fi
  35
  36   : ${libc_path=}
  37   : ${configureFlags=}
  38   configureFlags="${configureFlags//$oldout/$out}"
  39   if [ -n "$libc_path" ]; then
  40     libc_oldpath=$libc_path/lib
  41     libc_newpath=$(cat $libc_path/nix-support/new-out)/lib
  42     configureFlags="${configureFlags//$libc_oldpath/$libc_newpath}"
  43   fi
  44 }
  45
  46 addNixSupport() {
  47   if [ ! -d $out ]; then
  48     return
  49   fi
  50   mkdir -p $out/nix-support
  51   echo $out > $out/nix-support/new-out
  52 }
  53
  54 overridePlaceholder() {
  55 function _callImplicitHook {
  56   local def="$1"
  57   local hookName="$2"
  58   if declare -F "$hookName" > /dev/null; then
  59       "$hookName"
  60   elif type -p "$hookName" > /dev/null; then
  61       source "$hookName"
  62   elif [ -n "${!hookName:-}" ]; then
  63       content="${!hookName}"
  64       eval "${content//$oldout/$out}"
  65   else
  66       return "$def"
  67   fi
  68 }
  69 }
  70
  71 preHooks+=(appendOut overridePlaceholder)
  72
  73 restoreSingleFile() {
  74   if [ "$out" != "$oldout" -a -f $out ]; then
  75     cp -a $out ./file
  76     rm -rf $oldout
  77     cp -a ./file $oldout
  78   fi
  79 }
  80
  81 addSymlinks() {
  82   if [ "$out" != "$oldout" -a -d $out ]; then
  83     ln -s $out/* $oldout/
  84   fi
  85 }
  86
  87 rename_generic_build() {
  88 eval "$(echo "orig_genericBuild()"; declare -f genericBuild | tail -n +2)"
  89 function genericBuild {
  90   orig_genericBuild "$@"
  91   restoreSingleFile
  92   addSymlinks
  93   addNixSupport
  94 }
  95 }
  96
  97 exitHooks+=(restoreSingleFile addSymlinks addNixSupport)
  98 postHooks+=(rename_generic_build)