| author |  Igor Anić <igor.anic@gmail.com> 2024-02-24 23:37:55+01:00 |
| committer | Igor Anić <igor.anic@gmail.com> 2024-02-24 23:37:55+01:00 |
| log | b84301c8e5362be1692c7812bf86e64c2ee5a850 |
| tree | 59c1172ceced4868906c73c4cc2086af7e596a05 |
| parent | 6fddc9cd3d8002a44cf65e05d32c449bde6ca60c |
std.tar don't overwrite existing file
Fail with error if file already exists. File is not silently overwritten
but an error is raised.
Fixes: #180893 files changed, 59 insertions(+), 2 deletions(-)
lib/std/tar.zig+2-2
| ... | ... | @@ -544,12 +544,12 @@ pub fn pipeToFileSystem(dir: std.fs.Dir, reader: anytype, options: Options) !voi |
| 544 | 544 | const file_name = stripComponents(file.name, options.strip_components); |
| 545 | 545 | if (file_name.len == 0) return error.BadFileName; |
| 546 | 546 | |
| 547 | const fs_file = dir.createFile(file_name, .{}) catch |err| switch (err) { | |
| 547 | const fs_file = dir.createFile(file_name, .{ .exclusive = true }) catch |err| switch (err) { | |
| 548 | 548 | error.FileNotFound => again: { |
| 549 | 549 | const code = code: { |
| 550 | 550 | if (std.fs.path.dirname(file_name)) |dir_name| { |
| 551 | 551 | dir.makePath(dir_name) catch |code| break :code code; |
| 552 | break :again dir.createFile(file_name, .{}) catch |code| { | |
| 552 | break :again dir.createFile(file_name, .{ .exclusive = true }) catch |code| { | |
| 553 | 553 | break :code code; |
| 554 | 554 | }; |
| 555 | 555 | } |
lib/std/tar/test.zig+57
| ... | ... | @@ -369,3 +369,60 @@ const Md5Writer = struct { |
| 369 | 369 | return std.fmt.bytesToHex(s, .lower); |
| 370 | 370 | } |
| 371 | 371 | }; |
| 372 | ||
| 373 | test "tar should not overwrite existing file" { | |
| 374 | // Starting from this folder structure: | |
| 375 | // $ tree root | |
| 376 | // root | |
| 377 | // ├── a | |
| 378 | // │ └── b | |
| 379 | // │ └── c | |
| 380 | // │ └── file.txt | |
| 381 | // └── d | |
| 382 | // └── b | |
| 383 | // └── c | |
| 384 | // └── file.txt | |
| 385 | // | |
| 386 | // Packed with command: | |
| 387 | // $ cd root; tar cf overwrite_file.tar * | |
| 388 | // Resulting tar has following structure: | |
| 389 | // $ tar tvf overwrite_file.tar | |
| 390 | // size path | |
| 391 | // 0 a/ | |
| 392 | // 0 a/b/ | |
| 393 | // 0 a/b/c/ | |
| 394 | // 2 a/b/c/file.txt | |
| 395 | // 0 d/ | |
| 396 | // 0 d/b/ | |
| 397 | // 0 d/b/c/ | |
| 398 | // 2 d/b/c/file.txt | |
| 399 | // | |
| 400 | // Note that there is no root folder in archive. | |
| 401 | // | |
| 402 | // With strip_components = 1 resulting unpacked folder was: | |
| 403 | // root | |
| 404 | // └── b | |
| 405 | // └── c | |
| 406 | // └── file.txt | |
| 407 | // | |
| 408 | // a/b/c/file.txt is overwritten with d/b/c/file.txt !!! | |
| 409 | // This ensures that file is not overwritten. | |
| 410 | // | |
| 411 | const data = @embedFile("testdata/overwrite_file.tar"); | |
| 412 | var fsb = std.io.fixedBufferStream(data); | |
| 413 | ||
| 414 | // Unpack with strip_components = 1 should fail | |
| 415 | var root = std.testing.tmpDir(.{}); | |
| 416 | defer root.cleanup(); | |
| 417 | try testing.expectError( | |
| 418 | error.PathAlreadyExists, | |
| 419 | tar.pipeToFileSystem(root.dir, fsb.reader(), .{ .mode_mode = .ignore, .strip_components = 1 }), | |
| 420 | ); | |
| 421 | ||
| 422 | // Unpack with strip_components = 0 should pass | |
| 423 | fsb.reset(); | |
| 424 | var root2 = std.testing.tmpDir(.{}); | |
| 425 | defer root2.cleanup(); | |
| 426 | try tar.pipeToFileSystem(root2.dir, fsb.reader(), .{ .mode_mode = .ignore, .strip_components = 0 }); | |
| 427 | } | |
| 428 |
lib/std/tar/testdata/overwrite_file.tar created
| Binary files /dev/null and b/lib/std/tar/testdata/overwrite_file.tar differ |