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(breaking) clarify openDir API

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* remove deprecated `std.fs.Dir` APIs
 * `std.fs.Dir.openDir` now takes a options struct with bool fields for
   `access_sub_paths` and `iterate`. It's now much more clear how
   opening directories works.
 * fixed the std lib and various zig code calling the wrong openDir
   function.
 * the runtime safety check for dir flags is removed in favor of the
   cheaper option of putting a comment on the same line as handling
   EBADF / ACCESS_DENIED, since that will show up in stack traces.
This commit is contained in:
Andrew Kelley 2020-03-18 14:45:01 -04:00
parent c45fe2759f
commit 27affde592
No known key found for this signature in database
GPG Key ID: 7C5F548F728501A9
9 changed files with 62 additions and 136 deletions
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4
lib/std/build.zig
View File

@ -2156,10 +2156,10 @@ pub const LibExeObjStep = struct {
const build_output_dir = mem.trimRight(u8, output_dir_nl, "\r\n");
if (self.output_dir) |output_dir| {
var src_dir = try std.fs.cwd().openDirList(build_output_dir);
var src_dir = try std.fs.cwd().openDir(build_output_dir, .{ .iterate = true });
defer src_dir.close();
var dest_dir = try std.fs.cwd().openDirTraverse(output_dir);
var dest_dir = try std.fs.cwd().openDir(output_dir, .{});
defer dest_dir.close();
var it = src_dir.iterate();

2
lib/std/build/write_file.zig
View File

@ -78,7 +78,7 @@ pub const WriteFileStep = struct {
warn("unable to make path {}: {}\n", .{ self.output_dir, @errorName(err) });
return err;
};
var dir = try fs.cwd().openDirTraverse(self.output_dir);
var dir = try fs.cwd().openDir(self.output_dir, .{});
defer dir.close();
for (self.files.toSliceConst()) |file| {
dir.writeFile(file.basename, file.bytes) catch |err| {

163
lib/std/fs.zig
View File

@ -274,7 +274,7 @@ pub fn deleteTree(full_path: []const u8) !void {
CannotDeleteRootDirectory,
}.CannotDeleteRootDirectory;
var dir = try cwd().openDirList(dirname);
var dir = try cwd().openDir(dirname, .{});
defer dir.close();
return dir.deleteTree(path.basename(full_path));
@ -339,7 +339,7 @@ pub const Dir = struct {
if (rc == 0) return null;
if (rc < 0) {
switch (os.errno(rc)) {
os.EBADF => unreachable,
os.EBADF => unreachable, // Dir is invalid or was opened without iteration ability
os.EFAULT => unreachable,
os.ENOTDIR => unreachable,
os.EINVAL => unreachable,
@ -388,7 +388,7 @@ pub const Dir = struct {
);
switch (os.errno(rc)) {
0 => {},
os.EBADF => unreachable,
os.EBADF => unreachable, // Dir is invalid or was opened without iteration ability
os.EFAULT => unreachable,
os.ENOTDIR => unreachable,
os.EINVAL => unreachable,
@ -444,7 +444,7 @@ pub const Dir = struct {
const rc = os.linux.getdents64(self.dir.fd, &self.buf, self.buf.len);
switch (os.linux.getErrno(rc)) {
0 => {},
os.EBADF => unreachable,
os.EBADF => unreachable, // Dir is invalid or was opened without iteration ability
os.EFAULT => unreachable,
os.ENOTDIR => unreachable,
os.EINVAL => unreachable,
@ -555,36 +555,6 @@ pub const Dir = struct {
};
pub fn iterate(self: Dir) Iterator {
// Make sure the directory was not open with openDirTraverse
if (std.debug.runtime_safety) {
var ok = true;
if (builtin.os.tag == .windows) {
const w = os.windows;
var io_status_block: w.IO_STATUS_BLOCK = undefined;
var info: w.FILE_ACCESS_INFORMATION = undefined;
const rc = w.ntdll.NtQueryInformationFile(
self.fd,
&io_status_block,
&info,
@sizeOf(w.FILE_ACCESS_INFORMATION),
.FileAccessInformation,
);
assert(rc == .SUCCESS);
ok = (info.AccessFlags & w.FILE_LIST_DIRECTORY) != 0;
} else if (@hasDecl(os, "O_PATH")) {
const f = os.fcntl(self.fd, os.F_GETFL, 0) catch unreachable;
ok = (f & os.O_PATH) == 0;
}
if (!ok) {
std.debug.panic("iterate() called on Dir open with openDirTraverse", .{});
}
}
switch (builtin.os.tag) {
.macosx, .ios, .freebsd, .netbsd, .dragonfly => return Iterator{
.dir = self,
@ -626,16 +596,6 @@ pub const Dir = struct {
DeviceBusy,
} || os.UnexpectedError;
/// Deprecated; call `cwd().openDirList` directly.
pub fn open(dir_path: []const u8) OpenError!Dir {
return cwd().openDirList(dir_path);
}
/// Deprecated; call `cwd().openDirListC` directly.
pub fn openC(dir_path_c: [*:0]const u8) OpenError!Dir {
return cwd().openDirListC(dir_path_c);
}
pub fn close(self: *Dir) void {
if (need_async_thread) {
std.event.Loop.instance.?.close(self.fd);
@ -822,79 +782,61 @@ pub const Dir = struct {
try os.fchdir(self.fd);
}
/// Deprecated; call `openDirList` directly.
pub fn openDir(self: Dir, sub_path: []const u8) OpenError!Dir {
return self.openDirList(sub_path);
}
pub const OpenDirOptions = struct {
/// `true` means the opened directory can be used as the `Dir` parameter
/// for functions which operate based on an open directory handle. When `false`,
/// such operations are Illegal Behavior.
access_sub_paths: bool = true,
/// Deprecated; call `openDirListC` directly.
pub fn openDirC(self: Dir, sub_path_c: [*:0]const u8) OpenError!Dir {
return self.openDirListC(sub_path_c);
}
/// `true` means the opened directory can be scanned for the files and sub-directories
/// of the result. It means the `iterate` function can be called.
iterate: bool = false,
};
/// Opens a directory at the given path with the ability to access subpaths
/// of the result. Calling `iterate` on the result is illegal behavior; to
/// list the contents of a directory, open it with `openDirList`.
///
/// Call `close` on the result when done.
/// Opens a directory at the given path. The directory is a system resource that remains
/// open until `close` is called on the result.
///
/// Asserts that the path parameter has no null bytes.
/// TODO collapse this and `openDirList` into one function with an options parameter
pub fn openDirTraverse(self: Dir, sub_path: []const u8) OpenError!Dir {
pub fn openDir(self: Dir, sub_path: []const u8, args: OpenDirOptions) OpenError!Dir {
if (builtin.os.tag == .windows) {
const sub_path_w = try os.windows.sliceToPrefixedFileW(sub_path);
return self.openDirTraverseW(&sub_path_w);
return self.openDirW(&sub_path_w, args);
} else {
const sub_path_c = try os.toPosixPath(sub_path);
return self.openDirC(&sub_path_c, args);
}
const sub_path_c = try os.toPosixPath(sub_path);
return self.openDirTraverseC(&sub_path_c);
}
/// Opens a directory at the given path with the ability to access subpaths and list contents
/// of the result. If the ability to list contents is unneeded, `openDirTraverse` acts the
/// same and may be more efficient.
///
/// Call `close` on the result when done.
///
/// Asserts that the path parameter has no null bytes.
/// TODO collapse this and `openDirTraverse` into one function with an options parameter
pub fn openDirList(self: Dir, sub_path: []const u8) OpenError!Dir {
if (builtin.os.tag == .windows) {
const sub_path_w = try os.windows.sliceToPrefixedFileW(sub_path);
return self.openDirListW(&sub_path_w);
}
const sub_path_c = try os.toPosixPath(sub_path);
return self.openDirListC(&sub_path_c);
}
/// Same as `openDirTraverse` except the parameter is null-terminated.
pub fn openDirTraverseC(self: Dir, sub_path_c: [*:0]const u8) OpenError!Dir {
/// Same as `openDir` except the parameter is null-terminated.
pub fn openDirC(self: Dir, sub_path_c: [*:0]const u8, args: OpenDirOptions) OpenError!Dir {
if (builtin.os.tag == .windows) {
const sub_path_w = try os.windows.cStrToPrefixedFileW(sub_path_c);
return self.openDirTraverseW(&sub_path_w);
} else {
return self.openDirW(&sub_path_w, args);
} else if (!args.iterate) {
const O_PATH = if (@hasDecl(os, "O_PATH")) os.O_PATH else 0;
return self.openDirFlagsC(sub_path_c, os.O_RDONLY | os.O_CLOEXEC | O_PATH);
}
}
/// Same as `openDirList` except the parameter is null-terminated.
pub fn openDirListC(self: Dir, sub_path_c: [*:0]const u8) OpenError!Dir {
if (builtin.os.tag == .windows) {
const sub_path_w = try os.windows.cStrToPrefixedFileW(sub_path_c);
return self.openDirListW(&sub_path_w);
return self.openDirFlagsC(sub_path_c, os.O_DIRECTORY | os.O_RDONLY | os.O_CLOEXEC | O_PATH);
} else {
return self.openDirFlagsC(sub_path_c, os.O_RDONLY | os.O_CLOEXEC);
return self.openDirFlagsC(sub_path_c, os.O_DIRECTORY | os.O_RDONLY | os.O_CLOEXEC);
}
}
/// Same as `openDir` except the path parameter is WTF-16 encoded, NT-prefixed.
/// This function asserts the target OS is Windows.
pub fn openDirW(self: Dir, sub_path_w: [*:0]const u16, args: OpenDirOptions) OpenError!Dir {
const w = os.windows;
// TODO remove some of these flags if args.access_sub_paths is false
const base_flags = w.STANDARD_RIGHTS_READ | w.FILE_READ_ATTRIBUTES | w.FILE_READ_EA |
w.SYNCHRONIZE | w.FILE_TRAVERSE;
const flags: u32 = if (args.iterate) base_flags else base_flags | w.FILE_LIST_DIRECTORY;
return self.openDirAccessMaskW(sub_path_w, flags);
}
/// `flags` must contain `os.O_DIRECTORY`.
fn openDirFlagsC(self: Dir, sub_path_c: [*:0]const u8, flags: u32) OpenError!Dir {
const os_flags = flags | os.O_DIRECTORY;
const result = if (need_async_thread)
std.event.Loop.instance.?.openatZ(self.fd, sub_path_c, os_flags, 0)
std.event.Loop.instance.?.openatZ(self.fd, sub_path_c, flags, 0)
else
os.openatC(self.fd, sub_path_c, os_flags, 0);
os.openatC(self.fd, sub_path_c, flags, 0);
const fd = result catch |err| switch (err) {
error.FileTooBig => unreachable, // can't happen for directories
error.IsDir => unreachable, // we're providing O_DIRECTORY
@ -905,22 +847,6 @@ pub const Dir = struct {
return Dir{ .fd = fd };
}
/// Same as `openDirTraverse` except the path parameter is UTF16LE, NT-prefixed.
/// This function is Windows-only.
pub fn openDirTraverseW(self: Dir, sub_path_w: [*:0]const u16) OpenError!Dir {
const w = os.windows;
return self.openDirAccessMaskW(sub_path_w, w.STANDARD_RIGHTS_READ | w.FILE_READ_ATTRIBUTES | w.FILE_READ_EA | w.SYNCHRONIZE | w.FILE_TRAVERSE);
}
/// Same as `openDirList` except the path parameter is UTF16LE, NT-prefixed.
/// This function is Windows-only.
pub fn openDirListW(self: Dir, sub_path_w: [*:0]const u16) OpenError!Dir {
const w = os.windows;
return self.openDirAccessMaskW(sub_path_w, w.STANDARD_RIGHTS_READ | w.FILE_READ_ATTRIBUTES | w.FILE_READ_EA | w.SYNCHRONIZE | w.FILE_TRAVERSE | w.FILE_LIST_DIRECTORY);
}
fn openDirAccessMaskW(self: Dir, sub_path_w: [*:0]const u16, access_mask: u32) OpenError!Dir {
const w = os.windows;
@ -1141,7 +1067,7 @@ pub const Dir = struct {
error.Unexpected,
=> |e| return e,
}
var dir = self.openDirList(sub_path) catch |err| switch (err) {
var dir = self.openDir(sub_path, .{ .iterate = true }) catch |err| switch (err) {
error.NotDir => {
if (got_access_denied) {
return error.AccessDenied;
@ -1174,7 +1100,6 @@ pub const Dir = struct {
var dir_name_buf: [MAX_PATH_BYTES]u8 = undefined;
var dir_name: []const u8 = sub_path;
var parent_dir = self;
// Here we must avoid recursion, in order to provide O(1) memory guarantee of this function.
// Go through each entry and if it is not a directory, delete it. If it is a directory,
@ -1206,7 +1131,7 @@ pub const Dir = struct {
=> |e| return e,
}
const new_dir = dir.openDirList(entry.name) catch |err| switch (err) {
const new_dir = dir.openDir(entry.name, .{ .iterate = true }) catch |err| switch (err) {
error.NotDir => {
if (got_access_denied) {
return error.AccessDenied;
@ -1491,7 +1416,7 @@ pub const Walker = struct {
try self.name_buffer.appendByte(path.sep);
try self.name_buffer.append(base.name);
if (base.kind == .Directory) {
var new_dir = top.dir_it.dir.openDirList(base.name) catch |err| switch (err) {
var new_dir = top.dir_it.dir.openDir(base.name, .{ .iterate = true }) catch |err| switch (err) {
error.NameTooLong => unreachable, // no path sep in base.name
else => |e| return e,
};
@ -1529,7 +1454,7 @@ pub const Walker = struct {
pub fn walkPath(allocator: *Allocator, dir_path: []const u8) !Walker {
assert(!mem.endsWith(u8, dir_path, path.sep_str));
var dir = try cwd().openDirList(dir_path);
var dir = try cwd().openDir(dir_path, .{ .iterate = true });
errdefer dir.close();
var name_buffer = try std.Buffer.init(allocator, dir_path);

11
lib/std/os/test.zig
View File

@ -21,7 +21,7 @@ test "makePath, put some files in it, deleteTree" {
try io.writeFile("os_test_tmp" ++ fs.path.sep_str ++ "b" ++ fs.path.sep_str ++ "c" ++ fs.path.sep_str ++ "file.txt", "nonsense");
try io.writeFile("os_test_tmp" ++ fs.path.sep_str ++ "b" ++ fs.path.sep_str ++ "file2.txt", "blah");
try fs.deleteTree("os_test_tmp");
if (fs.cwd().openDirTraverse("os_test_tmp")) |dir| {
if (fs.cwd().openDir("os_test_tmp", .{})) |dir| {
@panic("expected error");
} else |err| {
expect(err == error.FileNotFound);
@ -49,7 +49,7 @@ test "sendfile" {
try fs.cwd().makePath("os_test_tmp");
defer fs.deleteTree("os_test_tmp") catch {};
var dir = try fs.cwd().openDirList("os_test_tmp");
var dir = try fs.cwd().openDir("os_test_tmp", .{});
defer dir.close();
const line1 = "line1\n";
@ -455,7 +455,10 @@ test "fcntl" {
const test_out_file = "os_tmp_test";
const file = try fs.cwd().createFile(test_out_file, .{});
defer file.close();
defer {
file.close();
fs.cwd().deleteFile(test_out_file) catch {};
}
// Note: The test assumes createFile opens the file with O_CLOEXEC
{
@ -472,6 +475,4 @@ test "fcntl" {
const flags = try os.fcntl(file.handle, os.F_GETFD, 0);
expect((flags & os.FD_CLOEXEC) != 0);
}
try fs.cwd().deleteFile(test_out_file);
}

2
lib/std/zig/system.zig
View File

@ -754,7 +754,7 @@ pub const NativeTargetInfo = struct {
const rpath_list = mem.toSliceConst(u8, @ptrCast([*:0]u8, strtab[rpoff..].ptr));
var it = mem.tokenize(rpath_list, ":");
while (it.next()) |rpath| {
var dir = fs.cwd().openDirList(rpath) catch |err| switch (err) {
var dir = fs.cwd().openDir(rpath, .{}) catch |err| switch (err) {
error.NameTooLong => unreachable,
error.InvalidUtf8 => unreachable,
error.BadPathName => unreachable,

10
src-self-hosted/libc_installation.zig
View File

@ -280,7 +280,7 @@ pub const LibCInstallation = struct {
// search in reverse order
const search_path_untrimmed = search_paths.at(search_paths.len - path_i - 1);
const search_path = std.mem.trimLeft(u8, search_path_untrimmed, " ");
var search_dir = fs.cwd().openDirList(search_path) catch |err| switch (err) {
var search_dir = fs.cwd().openDir(search_path, .{}) catch |err| switch (err) {
error.FileNotFound,
error.NotDir,
error.NoDevice,
@ -335,7 +335,7 @@ pub const LibCInstallation = struct {
const stream = result_buf.outStream();
try stream.print("{}\\Include\\{}\\ucrt", .{ search.path, search.version });
var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
var dir = fs.cwd().openDir(result_buf.toSliceConst(), .{}) catch |err| switch (err) {
error.FileNotFound,
error.NotDir,
error.NoDevice,
@ -382,7 +382,7 @@ pub const LibCInstallation = struct {
const stream = result_buf.outStream();
try stream.print("{}\\Lib\\{}\\ucrt\\{}", .{ search.path, search.version, arch_sub_dir });
var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
var dir = fs.cwd().openDir(result_buf.toSliceConst(), .{}) catch |err| switch (err) {
error.FileNotFound,
error.NotDir,
error.NoDevice,
@ -437,7 +437,7 @@ pub const LibCInstallation = struct {
const stream = result_buf.outStream();
try stream.print("{}\\Lib\\{}\\um\\{}", .{ search.path, search.version, arch_sub_dir });
var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
var dir = fs.cwd().openDir(result_buf.toSliceConst(), .{}) catch |err| switch (err) {
error.FileNotFound,
error.NotDir,
error.NoDevice,
@ -475,7 +475,7 @@ pub const LibCInstallation = struct {
try result_buf.append("\\include");
var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
var dir = fs.cwd().openDir(result_buf.toSliceConst(), .{}) catch |err| switch (err) {
error.FileNotFound,
error.NotDir,
error.NoDevice,

2
src-self-hosted/main.zig
View File

@ -734,7 +734,7 @@ async fn fmtPath(fmt: *Fmt, file_path_ref: []const u8, check_mode: bool) FmtErro
max_src_size,
) catch |err| switch (err) {
error.IsDir, error.AccessDenied => {
var dir = try fs.cwd().openDirList(file_path);
var dir = try fs.cwd().openDir(file_path, .{ .iterate = true });
defer dir.close();
var group = event.Group(FmtError!void).init(fmt.allocator);

2
src-self-hosted/print_targets.zig
View File

@ -72,7 +72,7 @@ pub fn cmdTargets(
};
defer allocator.free(zig_lib_dir);
var dir = try std.fs.cwd().openDirList(zig_lib_dir);
var dir = try std.fs.cwd().openDir(zig_lib_dir, .{});
defer dir.close();
const vers_txt = try dir.readFileAlloc(allocator, "libc/glibc/vers.txt", 10 * 1024);

2
src-self-hosted/stage2.zig
View File

@ -319,7 +319,7 @@ fn fmtPath(fmt: *Fmt, file_path: []const u8, check_mode: bool) FmtError!void {
const source_code = io.readFileAlloc(fmt.allocator, file_path) catch |err| switch (err) {
error.IsDir, error.AccessDenied => {
// TODO make event based (and dir.next())
var dir = try fs.cwd().openDirList(file_path);
var dir = try fs.cwd().openDir(file_path, .{ .iterate = true });
defer dir.close();
var dir_it = dir.iterate();