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{ stdenv, lib, runCommandLocal, coreutils, nix }:
let
mkNixRemote = proto: let
hostAndQuery = "nix-remote-build@taalo.headcounter.org?compress=true";
in "${proto}://${hostAndQuery}";
remoteCopyEsc = lib.escapeShellArg (mkNixRemote "ssh");
remoteEsc = lib.escapeShellArg (mkNixRemote "ssh-ng");
mkNix = cmd: lib.escapeShellArg "${nix}/bin/${cmd}";
errorOnly = cmd:
"if ! outerr=\"$(${cmd} 2>&1)\"; then echo \"$outerr\" >&2; exit 1; fi";
remoteRealize = pre: arg: ''
${errorOnly "${mkNix "nix"} copy -s --quiet --to ${remoteCopyEsc} ${arg}"}
NIX_REMOTE=${remoteEsc} ${pre}${mkNix "nix-store"} -r ${arg}
'';
emitScript = content: let
result = "#!${stdenv.shell}\nset -e\n${content}";
in "echo -n ${lib.escapeShellArg result}";
in runCommandLocal "taalo-build" {} ''
mkdir -p "$out/bin"
${emitScript (''
gctmp="$(${lib.escapeShellArg "${coreutils}/bin/mktemp"} -d)"
trap 'rm -rf "$gctmp"' EXIT
drv="$(${mkNix "nix-instantiate"} --add-root "$gctmp/drv" --indirect "$@")"
'' + remoteRealize "" "$drv")} > "$out/bin/taalo-build"
${emitScript (remoteRealize "exec " "\"$@\"")} > "$out/bin/taalo-realize"
chmod +x "$out"/bin/taalo-{build,realize}
''
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