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count_chunks() {
elements="${1//[^\/]}"
echo $(( "${#elements}" ))
}
oldout=$out
prefix_chunks=$(count_chunks $NIX_STORE)
: ${storepath_length=${#NIX_STORE}}
: ${storepath_chunks=$prefix_chunks}
if [ "$storepath_chunks" -lt $prefix_chunks ]; then
echo "Need to have at least as much path elements as the initial prefix"
exit 1
fi
min_length=$(( ${#NIX_STORE} + 2 * $storepath_chunks - 2 * $prefix_chunks ))
if [ "$storepath_length" -lt "$min_length" ]; then
echo "The storepath length needs to be at least the length of the prefix"
exit 1
fi
if [ "$storepath_chunks" -eq "$prefix_chunks" -a "$storepath_length" -gt "$min_length" ]; then
echo "You need at least one more chunk for a non-standard path length"
exit 1
fi
appendOut() {
chunk_prefix=$(for (( c=$prefix_chunks ; c < $storepath_chunks ; c++ )); do echo -n "/x"; done)
length_prefix=$(for (( c=$(( ${#NIX_STORE} + ${#chunk_prefix} )) ; c < $storepath_length ; c++ )); do echo -n "x"; done)
out="$out$chunk_prefix$length_prefix"
if [ -n $chunk_prefix -o -n $length_prefix ]; then
mkdir -p $(dirname $out)
fi
: ${libc_path=}
: ${configureFlags=}
configureFlags="${configureFlags//$oldout/$out}"
if [ -n "$libc_path" ]; then
libc_oldpath=$libc_path/lib
libc_newpath=$(cat $libc_path/nix-support/new-out)/lib
configureFlags="${configureFlags//$libc_oldpath/$libc_newpath}"
fi
}
addNixSupport() {
if [ ! -d $out ]; then
return
fi
mkdir -p $out/nix-support
echo $out > $out/nix-support/new-out
}
overridePlaceholder() {
function _callImplicitHook {
local def="$1"
local hookName="$2"
if declare -F "$hookName" > /dev/null; then
"$hookName"
elif type -p "$hookName" > /dev/null; then
source "$hookName"
elif [ -n "${!hookName:-}" ]; then
content="${!hookName}"
eval "${content//$oldout/$out}"
else
return "$def"
fi
}
}
preHooks+=(appendOut overridePlaceholder)
restoreSingleFile() {
if [ "$out" != "$oldout" -a -f $out ]; then
cp -a $out ./file
rm -rf $oldout
cp -a ./file $oldout
fi
}
addSymlinks() {
if [ "$out" != "$oldout" -a -d $out ]; then
ln -s $out/* $oldout/
fi
}
rename_generic_build() {
eval "$(echo "orig_genericBuild()"; declare -f genericBuild | tail -n +2)"
function genericBuild {
orig_genericBuild "$@"
restoreSingleFile
addSymlinks
addNixSupport
}
}
exitHooks+=(restoreSingleFile addSymlinks addNixSupport)
postHooks+=(rename_generic_build)
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