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{ lib, s6-portable-utils, coreutils, runExecline }:
# DrvPath :: path relative to the derivation
# AbsPath :: absolute path in the store
# Name
# -> List (Symlink { dest: DrvPath, orig: AbsPath })
# -> Drv
name: links:
let
toNetstring = s:
"${toString (builtins.stringLength s)}:${s},";
in
runExecline {
inherit name;
derivationArgs = {
pathTuples = lib.concatMapStrings
({dest, orig}: toNetstring
(toNetstring dest + (toNetstring orig)))
links;
passAsFile = [ "pathTuples" ];
# bah! coreutils just for cat :(
PATH = lib.makeBinPath [ s6-portable-utils ];
};
execline = ''
importas -ui p pathTuplesPath
importas -ui out out
forbacktickx -d "" destorig { ${coreutils}/bin/cat $p }
importas -ui do destorig
multidefine -d "" $do { destsuffix orig }
define dest ''${out}/''${destsuffix}
# this call happens for every file, not very efficient
foreground {
backtick -n d { s6-dirname $dest }
importas -ui d d
s6-mkdir -p $d
}
ifthenelse { s6-test -L $orig } {
backtick -n res { s6-linkname -f $orig }
importas -ui res res
s6-ln -fs $res $dest
} {
s6-ln -fs $orig $dest
}
'';
}
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