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const std = @import("std");
const builtin = @import("builtin");
const mem = std.mem;
const os = std.os;
const fs = std.fs;
const Compilation = @import("Compilation.zig");
/// Returns the sub_path that worked, or `null` if none did.
/// The path of the returned Directory is relative to `base`.
/// The handle of the returned Directory is open.
fn testZigInstallPrefix(base_dir: fs.Dir) ?Compilation.Directory {
const test_index_file = "std" ++ fs.path.sep_str ++ "std.zig";
zig_dir: {
// Try lib/zig/std/std.zig
const lib_zig = "lib" ++ fs.path.sep_str ++ "zig";
var test_zig_dir = base_dir.openDir(lib_zig, .{}) catch break :zig_dir;
const file = test_zig_dir.openFile(test_index_file, .{}) catch {
test_zig_dir.close();
break :zig_dir;
};
file.close();
return Compilation.Directory{ .handle = test_zig_dir, .path = lib_zig };
}
// Try lib/std/std.zig
var test_zig_dir = base_dir.openDir("lib", .{}) catch return null;
const file = test_zig_dir.openFile(test_index_file, .{}) catch {
test_zig_dir.close();
return null;
};
file.close();
return Compilation.Directory{ .handle = test_zig_dir, .path = "lib" };
}
/// This is a small wrapper around selfExePathAlloc that adds support for WASI
/// based on a hard-coded Preopen directory ("/zig")
pub fn findZigExePath(allocator: mem.Allocator) ![]u8 {
if (builtin.os.tag == .wasi) {
var args = try std.process.argsWithAllocator(allocator);
defer args.deinit();
// On WASI, argv[0] is always just the basename of the current executable
const argv0 = args.next() orelse return error.FileNotFound;
// Check these paths:
// 1. "/zig/{exe_name}"
// 2. "/zig/bin/{exe_name}"
const base_paths_to_check = &[_][]const u8{ "/zig", "/zig/bin" };
const exe_names_to_check = &[_][]const u8{ fs.path.basename(argv0), "zig.wasm" };
for (base_paths_to_check) |base_path| {
for (exe_names_to_check) |exe_name| {
const test_path = fs.path.join(allocator, &.{ base_path, exe_name }) catch continue;
defer allocator.free(test_path);
// Make sure it's a file we're pointing to
const file = os.fstatat(os.wasi.AT.FDCWD, test_path, 0) catch continue;
if (file.filetype != .REGULAR_FILE) continue;
// Path seems to be valid, let's try to turn it into an absolute path
var real_path_buf: [fs.MAX_PATH_BYTES]u8 = undefined;
if (os.realpath(test_path, &real_path_buf)) |real_path| {
return allocator.dupe(u8, real_path); // Success: return absolute path
} else |_| continue;
}
}
return error.FileNotFound;
}
return fs.selfExePathAlloc(allocator);
}
/// Both the directory handle and the path are newly allocated resources which the caller now owns.
pub fn findZigLibDir(gpa: mem.Allocator) !Compilation.Directory {
const self_exe_path = try findZigExePath(gpa);
defer gpa.free(self_exe_path);
return findZigLibDirFromSelfExe(gpa, self_exe_path);
}
/// Both the directory handle and the path are newly allocated resources which the caller now owns.
pub fn findZigLibDirFromSelfExe(
allocator: mem.Allocator,
self_exe_path: []const u8,
) error{ OutOfMemory, FileNotFound }!Compilation.Directory {
const cwd = fs.cwd();
var cur_path: []const u8 = self_exe_path;
while (fs.path.dirname(cur_path)) |dirname| : (cur_path = dirname) {
var base_dir = cwd.openDir(dirname, .{}) catch continue;
defer base_dir.close();
const sub_directory = testZigInstallPrefix(base_dir) orelse continue;
return Compilation.Directory{
.handle = sub_directory.handle,
.path = try fs.path.join(allocator, &[_][]const u8{ dirname, sub_directory.path.? }),
};
}
return error.FileNotFound;
}
/// Caller owns returned memory.
pub fn resolveGlobalCacheDir(allocator: mem.Allocator) ![]u8 {
if (std.process.getEnvVarOwned(allocator, "ZIG_GLOBAL_CACHE_DIR")) |value| {
if (value.len > 0) {
return value;
} else {
allocator.free(value);
}
} else |_| {}
const appname = "zig";
if (builtin.os.tag != .windows) {
if (std.os.getenv("XDG_CACHE_HOME")) |cache_root| {
return fs.path.join(allocator, &[_][]const u8{ cache_root, appname });
} else if (std.os.getenv("HOME")) |home| {
return fs.path.join(allocator, &[_][]const u8{ home, ".cache", appname });
}
}
if (builtin.os.tag == .wasi) {
// On WASI, we have no way to get an App data dir, so we try to use a fixed
// Preopen path "/cache" as a last resort
const path = "/cache";
const file = os.fstatat(os.wasi.AT.FDCWD, path, 0) catch return error.CacheDirUnavailable;
if (file.filetype != .DIRECTORY) return error.CacheDirUnavailable;
return allocator.dupe(u8, path);
} else {
return fs.getAppDataDir(allocator, appname);
}
}
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