feat(3p/nix): Add main function for grpc daemon r/1472

Implement the main function for the new, proto-based nix daemon. This
mostly replicates the behavior of the previous nix daemon - it starts a
grpc server listening on the same nix socket path and supports the same
set of options - with the exception of --stdio, which has been renamed
to --pipe and documented in the man page.

Change-Id: Ib729283c1d5d35c0e1b0a968bc1f052f5527f2d7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1356
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: kanepyork <rikingcoding@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/third_party/nix/src/libutil/util.cc b/third_party/nix/src/libutil/util.cc
index f69c341c2c59..75a8e73eac77 100644
--- a/third_party/nix/src/libutil/util.cc
+++ b/third_party/nix/src/libutil/util.cc
@@ -167,6 +167,7 @@ Path canonPath(const Path& path, bool resolveSymlinks) {
   return s.empty() ? "/" : s;
 }
 
+// TODO(grfn) remove in favor of std::filesystem::path::parent_path()
 Path dirOf(absl::string_view path) {
   Path::size_type pos = path.rfind('/');
   if (pos == std::string::npos) {
@@ -175,6 +176,7 @@ Path dirOf(absl::string_view path) {
   return pos == 0 ? "/" : Path(path, 0, pos);
 }
 
+// TODO(grfn) remove in favor of std::filesystem::path::root_name()
 std::string baseNameOf(const Path& path) {
   if (path.empty()) {
     return "";
@@ -558,6 +560,7 @@ Path getDataDir() {
   return dataDir;
 }
 
+// TODO(grfn): Remove in favor of std::filesystem::create_directories
 Paths createDirs(const Path& path) {
   Paths created;
   if (path == "/") {