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# Inspired by python/wrapper.nix
# Wrapper around wrapLuaProgramsIn, below. The $luaPath
# variable is passed in from the buildLuarocksPackage function.
set -e
wrapLuaPrograms() {
wrapLuaProgramsIn "$out/bin" "$out $luaPath"
}
# Builds environment variables like LUA_PATH and PATH walking through closure
# of dependencies.
buildLuaPath() {
local luaPath="$1"
local path
# Create an empty table of paths (see doc on loadFromPropagatedInputs
# for how this is used). Build up the program_PATH and program_LUA_PATH
# variables.
declare -A luaPathsSeen=()
program_PATH=
luaPathsSeen["@lua@"]=1
addToSearchPath program_PATH @lua@/bin
for path in $luaPath; do
addToLuaPath "$path"
done
}
# with an executable shell script which will set some environment variables
# and then call into the original binary (which has been given a .wrapped suffix).
# luaPath is a list of directories
wrapLuaProgramsIn() {
local dir="$1"
local luaPath="$2"
local f
buildLuaPath "$luaPath"
if [ ! -d "$dir" ]; then
nix_debug "$dir not a directory"
return
fi
nix_debug "wrapping programs in [$dir]"
# Find all regular files in the output directory that are executable.
find "$dir" -type f -perm -0100 -print0 | while read -d "" f; do
# Rewrite "#! .../env lua" to "#! /nix/store/.../lua".
# Strip suffix, like "3" or "2.7m" -- we don't have any choice on which
# Lua to use besides one with this hook anyway.
if head -n1 "$f" | grep -q '#!.*/env.*\(lua\)'; then
sed -i "$f" -e "1 s^.*/env[ ]*\(lua\)[^ ]*^#! @executable@^"
fi
# wrapProgram creates the executable shell script described
# above. The script will set LUA_(C)PATH and PATH variables!
# (see pkgs/build-support/setup-hooks/make-wrapper.sh)
local -a wrap_args=("$f"
--prefix PATH ':' "$program_PATH"
--prefix LUA_PATH ';' "$LUA_PATH"
--prefix LUA_CPATH ';' "$LUA_CPATH"
)
# Add any additional arguments provided by makeWrapperArgs
# argument to buildLuaPackage.
# makeWrapperArgs
local -a user_args="($makeWrapperArgs)"
local -a wrapProgramArgs=("${wrap_args[@]}" "${user_args[@]}")
# see setup-hooks/make-wrapper.sh
wrapProgram "${wrapProgramArgs[@]}"
done
}
# Adds the lib and bin directories to the LUA_PATH and PATH variables,
# respectively. Recurses on any paths declared in
# `propagated-native-build-inputs`, while avoiding duplicating paths by
# flagging the directories it has visited in `luaPathsSeen`.
loadFromPropagatedInputs() {
local dir="$1"
# Stop if we've already visited here.
if [ -n "${luaPathsSeen[$dir]}" ]; then
return
fi
luaPathsSeen[$dir]=1
addToLuaPath "$dir"
addToSearchPath program_PATH $dir/bin
# Inspect the propagated inputs (if they exist) and recur on them.
local prop="$dir/nix-support/propagated-native-build-inputs"
if [ -e "$prop" ]; then
local new_path
for new_path in $(cat $prop); do
loadFromPropagatedInputs "$new_path"
done
fi
}
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