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   : ${installFlags=}
  39   installFlags="${installFlags//$oldout/$out}"
  40   configureFlags="${configureFlags//$oldout/$out}"
  41   if [ -n "$libc_path" ]; then
  42     libc_oldpath=$libc_path/lib
  43     libc_newpath=$(cat $libc_path/nix-support/new-out)/lib
  44     configureFlags="${configureFlags//$libc_oldpath/$libc_newpath}"
  45     installFlags="${installFlags//$libc_oldpath/$libc_newpath}"
  46   fi
  47 }
  48
  49 addNixSupport() {
  50   if [ ! -d $out ]; then
  51     return
  52   fi
  53   mkdir -p $out/nix-support
  54   echo $out > $out/nix-support/new-out
  55 }
  56
  57 overridePlaceholder() {
  58 function _callImplicitHook {
  59   local def="$1"
  60   local hookName="$2"
  61   if declare -F "$hookName" > /dev/null; then
  62       "$hookName"
  63   elif type -p "$hookName" > /dev/null; then
  64       source "$hookName"
  65   elif [ -n "${!hookName:-}" ]; then
  66       content="${!hookName}"
  67       eval "${content//$oldout/$out}"
  68   else
  69       return "$def"
  70   fi
  71 }
  72 }
  73
  74 preHooks+=(appendOut overridePlaceholder)
  75
  76 restoreSingleFile() {
  77   if [ "$out" != "$oldout" -a -f $out ]; then
  78     cp -a $out ./file
  79     rm -rf $oldout
  80     cp -a ./file $oldout
  81   fi
  82 }
  83
  84 addSymlinks() {
  85   if [ "$out" != "$oldout" -a -d $out ]; then
  86     ln -s $out/* $oldout/
  87   fi
  88 }
  89
  90 rename_generic_build() {
  91 eval "$(echo "orig_genericBuild()"; declare -f genericBuild | tail -n +2)"
  92 function genericBuild {
  93   orig_genericBuild "$@"
  94   restoreSingleFile
  95   addSymlinks
  96   addNixSupport
  97 }
  98 }
  99
 100 exitHooks+=(restoreSingleFile addSymlinks addNixSupport)
 101 postHooks+=(rename_generic_build)