build_runner: provide valid global cache to the build runner (#1009)

README.md

@@ -85,7 +85,8 @@ The following options are currently available.
 | `zig_lib_path` | `?[]const u8` | `null` | Zig library path, e.g. `/path/to/zig/lib/zig`, used to analyze std library imports |
 | `zig_exe_path` | `?[]const u8` | `null` | Zig executable path, e.g. `/path/to/zig/zig`, used to run the custom build runner. If `null`, zig is looked up in `PATH`. Will be used to infer the zig standard library path if none is provided |
 | `build_runner_path` | `?[]const u8` | `null` | Path to the `build_runner.zig` file provided by zls. null is equivalent to `${executable_directory}/build_runner.zig` |
-| `global_cache_path` | `?[]const u8` | `null` | Path to a directroy that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls` |
+| `global_cache_path` | `?[]const u8` | `null` | Path to a directory that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls` |
+| `build_runner_global_cache_path` | `?[]const u8` | `null` | Path to a directory that will be used as the global cache path when executing a projects build.zig. null is equivalent to the path shown by `zig env` |
 <!-- DO NOT EDIT -->
 
 ### Per-build Configuration Options

schema.json

@@ -125,7 +125,12 @@
             "default": "null"
         },
         "global_cache_path": {
-            "description": "Path to a directroy that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls`",
+            "description": "Path to a directory that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls`",
+            "type": "string",
+            "default": "null"
+        },
+        "build_runner_global_cache_path": {
+            "description": "Path to a directory that will be used as the global cache path when executing a projects build.zig. null is equivalent to the path shown by `zig env`",
             "type": "string",
             "default": "null"
         }

src/Config.zig

@@ -76,7 +76,10 @@ zig_exe_path: ?[]const u8 = null,
 /// Path to the `build_runner.zig` file provided by zls. null is equivalent to `${executable_directory}/build_runner.zig`
 build_runner_path: ?[]const u8 = null,
 
-/// Path to a directroy that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls`
+/// Path to a directory that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls`
 global_cache_path: ?[]const u8 = null,
 
+/// Path to a directory that will be used as the global cache path when executing a projects build.zig. null is equivalent to the path shown by `zig env`
+build_runner_global_cache_path: ?[]const u8 = null,
+
 // DO NOT EDIT

src/DocumentStore.zig

@@ -419,9 +419,6 @@ fn loadBuildConfiguration(
 
     // TODO extract this option from `BuildAssociatedConfig.BuildOption`
     const zig_cache_root: []const u8 = try std.fs.path.join(arena_allocator, &.{ directory_path, "zig-cache" });
-    // Since we don't compile anything and no packages should put their
-    // files there this path can be ignored
-    const zig_global_cache_root: []const u8 = "ZLS_DONT_CARE";
 
     const standard_args = [_][]const u8{
         config.zig_exe_path.?,
@@ -437,7 +434,7 @@ fn loadBuildConfiguration(
         config.zig_exe_path.?,
         directory_path,
         zig_cache_root,
-        zig_global_cache_root,
+        config.build_runner_global_cache_path.?,
     };
 
     const arg_length = standard_args.len + if (build_file.build_associated_config) |cfg| if (cfg.build_options) |options| options.len else 0 else 0;

src/config_gen/config.json

@@ -146,7 +146,13 @@
         },
         {
             "name": "global_cache_path",
-            "description": "Path to a directroy that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls`",
+            "description": "Path to a directory that will be used as zig's cache. null is equivalent to `${KnownFloders.Cache}/zls`",
+            "type": "?[]const u8",
+            "default": "null"
+        },
+        {
+            "name": "build_runner_global_cache_path",
+            "description": "Path to a directory that will be used as the global cache path when executing a projects build.zig. null is equivalent to the path shown by `zig env`",
             "type": "?[]const u8",
             "default": "null"
         }

src/configuration.zig

@@ -78,14 +78,21 @@ pub fn configChanged(config: *Config, allocator: std.mem.Allocator, builtin_crea
     if (config.zig_exe_path) |exe_path| blk: {
         logger.info("Using zig executable {s}", .{exe_path});
 
-        if (config.zig_lib_path != null) break :blk;
+        if (config.zig_lib_path != null and config.build_runner_global_cache_path != null) break :blk;
 
         var env = getZigEnv(allocator, exe_path) orelse break :blk;
         defer std.json.parseFree(Env, env, .{ .allocator = allocator });
 
-        // Make sure the path is absolute
+        if (config.zig_lib_path == null) {
-        config.zig_lib_path = try std.fs.realpathAlloc(allocator, env.lib_dir.?);
+            // Make sure the path is absolute
-        logger.info("Using zig lib path '{s}'", .{config.zig_lib_path.?});
+            config.zig_lib_path = try std.fs.realpathAlloc(allocator, env.lib_dir.?);
+            logger.info("Using zig lib path '{s}'", .{config.zig_lib_path.?});
+        }
+
+        if (config.build_runner_global_cache_path == null) {
+            config.build_runner_global_cache_path = try allocator.dupe(u8, env.global_cache_dir);
+            logger.info("Using build runner global cache path '{s}'", .{config.build_runner_global_cache_path.?});
+        }
     } else {
         logger.warn("Zig executable path not specified in zls.json and could not be found in PATH", .{});
     }

src/special/build_runner.zig

@@ -72,9 +72,7 @@ pub fn main() !void {
 
     const global_cache_directory = if (has_cache) Cache.Directory{
         .path = global_cache_root,
-        // I don't know if with the incomming changes around caching whether `openDir` is correct,
+        .handle = try std.fs.cwd().makeOpenPath(global_cache_root, .{}),
-        // but `makeOpenPath` which zig build runner uses causes access denied
-        .handle = try std.fs.cwd().openDir(global_cache_root, .{}),
     } else global_cache_root;
 
     var cache = if (has_cache) Cache{