mirror of
https://github.com/ziglang/zig.git
synced 2024-11-15 00:26:57 +00:00
1207 lines
43 KiB
Zig
1207 lines
43 KiB
Zig
//! Tar archive is single ordinary file which can contain many files (or
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//! directories, symlinks, ...). It's build by series of blocks each size of 512
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//! bytes. First block of each entry is header which defines type, name, size
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//! permissions and other attributes. Header is followed by series of blocks of
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//! file content, if any that entry has content. Content is padded to the block
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//! size, so next header always starts at block boundary.
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//!
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//! This simple format is extended by GNU and POSIX pax extensions to support
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//! file names longer than 256 bytes and additional attributes.
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//!
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//! This is not comprehensive tar parser. Here we are only file types needed to
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//! support Zig package manager; normal file, directory, symbolic link. And
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//! subset of attributes: name, size, permissions.
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//!
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//! GNU tar reference: https://www.gnu.org/software/tar/manual/html_node/Standard.html
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//! pax reference: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13
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const std = @import("std");
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const assert = std.debug.assert;
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const testing = std.testing;
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pub const writer = @import("tar/writer.zig").writer;
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/// Provide this to receive detailed error messages.
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/// When this is provided, some errors which would otherwise be returned
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/// immediately will instead be added to this structure. The API user must check
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/// the errors in diagnostics to know whether the operation succeeded or failed.
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pub const Diagnostics = struct {
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allocator: std.mem.Allocator,
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errors: std.ArrayListUnmanaged(Error) = .empty,
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entries: usize = 0,
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root_dir: []const u8 = "",
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pub const Error = union(enum) {
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unable_to_create_sym_link: struct {
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code: anyerror,
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file_name: []const u8,
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link_name: []const u8,
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},
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unable_to_create_file: struct {
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code: anyerror,
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file_name: []const u8,
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},
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unsupported_file_type: struct {
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file_name: []const u8,
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file_type: Header.Kind,
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},
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components_outside_stripped_prefix: struct {
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file_name: []const u8,
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},
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};
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fn findRoot(d: *Diagnostics, path: []const u8) !void {
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if (path.len == 0) return;
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d.entries += 1;
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const root_dir = rootDir(path);
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if (d.entries == 1) {
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d.root_dir = try d.allocator.dupe(u8, root_dir);
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return;
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}
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if (d.root_dir.len == 0 or std.mem.eql(u8, root_dir, d.root_dir))
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return;
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d.allocator.free(d.root_dir);
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d.root_dir = "";
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}
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// Returns root dir of the path, assumes non empty path.
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fn rootDir(path: []const u8) []const u8 {
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const start_index: usize = if (path[0] == '/') 1 else 0;
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const end_index: usize = if (path[path.len - 1] == '/') path.len - 1 else path.len;
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const buf = path[start_index..end_index];
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if (std.mem.indexOfScalarPos(u8, buf, 0, '/')) |idx| {
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return buf[0..idx];
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}
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return buf;
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}
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test rootDir {
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const expectEqualStrings = testing.expectEqualStrings;
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try expectEqualStrings("a", rootDir("a"));
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try expectEqualStrings("b", rootDir("b"));
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try expectEqualStrings("c", rootDir("/c"));
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try expectEqualStrings("d", rootDir("/d/"));
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try expectEqualStrings("a", rootDir("a/b"));
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try expectEqualStrings("a", rootDir("a/b/c"));
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}
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pub fn deinit(d: *Diagnostics) void {
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for (d.errors.items) |item| {
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switch (item) {
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.unable_to_create_sym_link => |info| {
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d.allocator.free(info.file_name);
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d.allocator.free(info.link_name);
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},
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.unable_to_create_file => |info| {
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d.allocator.free(info.file_name);
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},
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.unsupported_file_type => |info| {
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d.allocator.free(info.file_name);
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},
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.components_outside_stripped_prefix => |info| {
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d.allocator.free(info.file_name);
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},
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}
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}
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d.errors.deinit(d.allocator);
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d.allocator.free(d.root_dir);
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d.* = undefined;
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}
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};
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/// pipeToFileSystem options
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pub const PipeOptions = struct {
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/// Number of directory levels to skip when extracting files.
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strip_components: u32 = 0,
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/// How to handle the "mode" property of files from within the tar file.
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mode_mode: ModeMode = .executable_bit_only,
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/// Prevents creation of empty directories.
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exclude_empty_directories: bool = false,
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/// Collects error messages during unpacking
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diagnostics: ?*Diagnostics = null,
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pub const ModeMode = enum {
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/// The mode from the tar file is completely ignored. Files are created
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/// with the default mode when creating files.
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ignore,
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/// The mode from the tar file is inspected for the owner executable bit
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/// only. This bit is copied to the group and other executable bits.
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/// Other bits of the mode are left as the default when creating files.
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executable_bit_only,
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};
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};
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const Header = struct {
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const SIZE = 512;
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const MAX_NAME_SIZE = 100 + 1 + 155; // name(100) + separator(1) + prefix(155)
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const LINK_NAME_SIZE = 100;
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bytes: *const [SIZE]u8,
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const Kind = enum(u8) {
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normal_alias = 0,
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normal = '0',
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hard_link = '1',
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symbolic_link = '2',
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character_special = '3',
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block_special = '4',
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directory = '5',
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fifo = '6',
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contiguous = '7',
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global_extended_header = 'g',
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extended_header = 'x',
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// Types 'L' and 'K' are used by the GNU format for a meta file
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// used to store the path or link name for the next file.
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gnu_long_name = 'L',
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gnu_long_link = 'K',
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gnu_sparse = 'S',
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solaris_extended_header = 'X',
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_,
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};
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/// Includes prefix concatenated, if any.
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/// TODO: check against "../" and other nefarious things
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pub fn fullName(header: Header, buffer: []u8) ![]const u8 {
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const n = name(header);
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const p = prefix(header);
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if (buffer.len < n.len + p.len + 1) return error.TarInsufficientBuffer;
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if (!is_ustar(header) or p.len == 0) {
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@memcpy(buffer[0..n.len], n);
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return buffer[0..n.len];
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}
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@memcpy(buffer[0..p.len], p);
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buffer[p.len] = '/';
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@memcpy(buffer[p.len + 1 ..][0..n.len], n);
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return buffer[0 .. p.len + 1 + n.len];
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}
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/// When kind is symbolic_link linked-to name (target_path) is specified in
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/// the linkname field.
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pub fn linkName(header: Header, buffer: []u8) ![]const u8 {
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const link_name = header.str(157, 100);
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if (link_name.len == 0) {
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return buffer[0..0];
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}
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if (buffer.len < link_name.len) return error.TarInsufficientBuffer;
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const buf = buffer[0..link_name.len];
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@memcpy(buf, link_name);
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return buf;
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}
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pub fn name(header: Header) []const u8 {
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return header.str(0, 100);
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}
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pub fn mode(header: Header) !u32 {
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return @intCast(try header.octal(100, 8));
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}
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pub fn size(header: Header) !u64 {
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const start = 124;
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const len = 12;
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const raw = header.bytes[start..][0..len];
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// If the leading byte is 0xff (255), all the bytes of the field
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// (including the leading byte) are concatenated in big-endian order,
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// with the result being a negative number expressed in two’s
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// complement form.
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if (raw[0] == 0xff) return error.TarNumericValueNegative;
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// If the leading byte is 0x80 (128), the non-leading bytes of the
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// field are concatenated in big-endian order.
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if (raw[0] == 0x80) {
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if (raw[1] != 0 or raw[2] != 0 or raw[3] != 0) return error.TarNumericValueTooBig;
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return std.mem.readInt(u64, raw[4..12], .big);
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}
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return try header.octal(start, len);
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}
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pub fn chksum(header: Header) !u64 {
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return header.octal(148, 8);
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}
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pub fn is_ustar(header: Header) bool {
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const magic = header.bytes[257..][0..6];
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return std.mem.eql(u8, magic[0..5], "ustar") and (magic[5] == 0 or magic[5] == ' ');
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}
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pub fn prefix(header: Header) []const u8 {
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return header.str(345, 155);
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}
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pub fn kind(header: Header) Kind {
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const result: Kind = @enumFromInt(header.bytes[156]);
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if (result == .normal_alias) return .normal;
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return result;
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}
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fn str(header: Header, start: usize, len: usize) []const u8 {
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return nullStr(header.bytes[start .. start + len]);
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}
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fn octal(header: Header, start: usize, len: usize) !u64 {
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const raw = header.bytes[start..][0..len];
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// Zero-filled octal number in ASCII. Each numeric field of width w
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// contains w minus 1 digits, and a null
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const ltrimmed = std.mem.trimLeft(u8, raw, "0 ");
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const rtrimmed = std.mem.trimRight(u8, ltrimmed, " \x00");
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if (rtrimmed.len == 0) return 0;
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return std.fmt.parseInt(u64, rtrimmed, 8) catch return error.TarHeader;
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}
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const Chksums = struct {
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unsigned: u64,
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signed: i64,
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};
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// Sum of all bytes in the header block. The chksum field is treated as if
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// it were filled with spaces (ASCII 32).
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fn computeChksum(header: Header) Chksums {
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var cs: Chksums = .{ .signed = 0, .unsigned = 0 };
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for (header.bytes, 0..) |v, i| {
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const b = if (148 <= i and i < 156) 32 else v; // Treating chksum bytes as spaces.
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cs.unsigned += b;
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cs.signed += @as(i8, @bitCast(b));
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}
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return cs;
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}
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// Checks calculated chksum with value of chksum field.
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// Returns error or valid chksum value.
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// Zero value indicates empty block.
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pub fn checkChksum(header: Header) !u64 {
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const field = try header.chksum();
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const cs = header.computeChksum();
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if (field == 0 and cs.unsigned == 256) return 0;
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if (field != cs.unsigned and field != cs.signed) return error.TarHeaderChksum;
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return field;
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}
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};
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// Breaks string on first null character.
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fn nullStr(str: []const u8) []const u8 {
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for (str, 0..) |c, i| {
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if (c == 0) return str[0..i];
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}
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return str;
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}
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/// Options for iterator.
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/// Buffers should be provided by the caller.
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pub const IteratorOptions = struct {
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/// Use a buffer with length `std.fs.max_path_bytes` to match file system capabilities.
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file_name_buffer: []u8,
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/// Use a buffer with length `std.fs.max_path_bytes` to match file system capabilities.
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link_name_buffer: []u8,
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/// Collects error messages during unpacking
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diagnostics: ?*Diagnostics = null,
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};
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/// Iterates over files in tar archive.
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/// `next` returns each file in tar archive.
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pub fn iterator(reader: anytype, options: IteratorOptions) Iterator(@TypeOf(reader)) {
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return .{
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.reader = reader,
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.diagnostics = options.diagnostics,
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.file_name_buffer = options.file_name_buffer,
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.link_name_buffer = options.link_name_buffer,
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};
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}
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/// Type of the file returned by iterator `next` method.
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pub const FileKind = enum {
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directory,
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sym_link,
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file,
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};
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/// Iterator over entries in the tar file represented by reader.
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pub fn Iterator(comptime ReaderType: type) type {
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return struct {
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reader: ReaderType,
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diagnostics: ?*Diagnostics = null,
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// buffers for heeader and file attributes
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header_buffer: [Header.SIZE]u8 = undefined,
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file_name_buffer: []u8,
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link_name_buffer: []u8,
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// bytes of padding to the end of the block
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padding: usize = 0,
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// not consumed bytes of file from last next iteration
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unread_file_bytes: u64 = 0,
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pub const File = struct {
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name: []const u8, // name of file, symlink or directory
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link_name: []const u8, // target name of symlink
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size: u64 = 0, // size of the file in bytes
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mode: u32 = 0,
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kind: FileKind = .file,
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unread_bytes: *u64,
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parent_reader: ReaderType,
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pub const Reader = std.io.Reader(File, ReaderType.Error, File.read);
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pub fn reader(self: File) Reader {
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return .{ .context = self };
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}
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pub fn read(self: File, dest: []u8) ReaderType.Error!usize {
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const buf = dest[0..@min(dest.len, self.unread_bytes.*)];
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const n = try self.parent_reader.read(buf);
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self.unread_bytes.* -= n;
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return n;
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}
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// Writes file content to writer.
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pub fn writeAll(self: File, out_writer: anytype) !void {
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var buffer: [4096]u8 = undefined;
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while (self.unread_bytes.* > 0) {
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const buf = buffer[0..@min(buffer.len, self.unread_bytes.*)];
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try self.parent_reader.readNoEof(buf);
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try out_writer.writeAll(buf);
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self.unread_bytes.* -= buf.len;
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}
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}
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};
|
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const Self = @This();
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||
|
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fn readHeader(self: *Self) !?Header {
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if (self.padding > 0) {
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try self.reader.skipBytes(self.padding, .{});
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}
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const n = try self.reader.readAll(&self.header_buffer);
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if (n == 0) return null;
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if (n < Header.SIZE) return error.UnexpectedEndOfStream;
|
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const header = Header{ .bytes = self.header_buffer[0..Header.SIZE] };
|
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if (try header.checkChksum() == 0) return null;
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return header;
|
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}
|
||
|
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fn readString(self: *Self, size: usize, buffer: []u8) ![]const u8 {
|
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if (size > buffer.len) return error.TarInsufficientBuffer;
|
||
const buf = buffer[0..size];
|
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try self.reader.readNoEof(buf);
|
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return nullStr(buf);
|
||
}
|
||
|
||
fn newFile(self: *Self) File {
|
||
return .{
|
||
.name = self.file_name_buffer[0..0],
|
||
.link_name = self.link_name_buffer[0..0],
|
||
.parent_reader = self.reader,
|
||
.unread_bytes = &self.unread_file_bytes,
|
||
};
|
||
}
|
||
|
||
// Number of padding bytes in the last file block.
|
||
fn blockPadding(size: u64) usize {
|
||
const block_rounded = std.mem.alignForward(u64, size, Header.SIZE); // size rounded to te block boundary
|
||
return @intCast(block_rounded - size);
|
||
}
|
||
|
||
/// Iterates through the tar archive as if it is a series of files.
|
||
/// Internally, the tar format often uses entries (header with optional
|
||
/// content) to add meta data that describes the next file. These
|
||
/// entries should not normally be visible to the outside. As such, this
|
||
/// loop iterates through one or more entries until it collects a all
|
||
/// file attributes.
|
||
pub fn next(self: *Self) !?File {
|
||
if (self.unread_file_bytes > 0) {
|
||
// If file content was not consumed by caller
|
||
try self.reader.skipBytes(self.unread_file_bytes, .{});
|
||
self.unread_file_bytes = 0;
|
||
}
|
||
var file: File = self.newFile();
|
||
|
||
while (try self.readHeader()) |header| {
|
||
const kind = header.kind();
|
||
const size: u64 = try header.size();
|
||
self.padding = blockPadding(size);
|
||
|
||
switch (kind) {
|
||
// File types to return upstream
|
||
.directory, .normal, .symbolic_link => {
|
||
file.kind = switch (kind) {
|
||
.directory => .directory,
|
||
.normal => .file,
|
||
.symbolic_link => .sym_link,
|
||
else => unreachable,
|
||
};
|
||
file.mode = try header.mode();
|
||
|
||
// set file attributes if not already set by prefix/extended headers
|
||
if (file.size == 0) {
|
||
file.size = size;
|
||
}
|
||
if (file.link_name.len == 0) {
|
||
file.link_name = try header.linkName(self.link_name_buffer);
|
||
}
|
||
if (file.name.len == 0) {
|
||
file.name = try header.fullName(self.file_name_buffer);
|
||
}
|
||
|
||
self.padding = blockPadding(file.size);
|
||
self.unread_file_bytes = file.size;
|
||
return file;
|
||
},
|
||
// Prefix header types
|
||
.gnu_long_name => {
|
||
file.name = try self.readString(@intCast(size), self.file_name_buffer);
|
||
},
|
||
.gnu_long_link => {
|
||
file.link_name = try self.readString(@intCast(size), self.link_name_buffer);
|
||
},
|
||
.extended_header => {
|
||
// Use just attributes from last extended header.
|
||
file = self.newFile();
|
||
|
||
var rdr = paxIterator(self.reader, @intCast(size));
|
||
while (try rdr.next()) |attr| {
|
||
switch (attr.kind) {
|
||
.path => {
|
||
file.name = try attr.value(self.file_name_buffer);
|
||
},
|
||
.linkpath => {
|
||
file.link_name = try attr.value(self.link_name_buffer);
|
||
},
|
||
.size => {
|
||
var buf: [pax_max_size_attr_len]u8 = undefined;
|
||
file.size = try std.fmt.parseInt(u64, try attr.value(&buf), 10);
|
||
},
|
||
}
|
||
}
|
||
},
|
||
// Ignored header type
|
||
.global_extended_header => {
|
||
self.reader.skipBytes(size, .{}) catch return error.TarHeadersTooBig;
|
||
},
|
||
// All other are unsupported header types
|
||
else => {
|
||
const d = self.diagnostics orelse return error.TarUnsupportedHeader;
|
||
try d.errors.append(d.allocator, .{ .unsupported_file_type = .{
|
||
.file_name = try d.allocator.dupe(u8, header.name()),
|
||
.file_type = kind,
|
||
} });
|
||
if (kind == .gnu_sparse) {
|
||
try self.skipGnuSparseExtendedHeaders(header);
|
||
}
|
||
self.reader.skipBytes(size, .{}) catch return error.TarHeadersTooBig;
|
||
},
|
||
}
|
||
}
|
||
return null;
|
||
}
|
||
|
||
fn skipGnuSparseExtendedHeaders(self: *Self, header: Header) !void {
|
||
var is_extended = header.bytes[482] > 0;
|
||
while (is_extended) {
|
||
var buf: [Header.SIZE]u8 = undefined;
|
||
const n = try self.reader.readAll(&buf);
|
||
if (n < Header.SIZE) return error.UnexpectedEndOfStream;
|
||
is_extended = buf[504] > 0;
|
||
}
|
||
}
|
||
};
|
||
}
|
||
|
||
/// Pax attributes iterator.
|
||
/// Size is length of pax extended header in reader.
|
||
fn paxIterator(reader: anytype, size: usize) PaxIterator(@TypeOf(reader)) {
|
||
return PaxIterator(@TypeOf(reader)){
|
||
.reader = reader,
|
||
.size = size,
|
||
};
|
||
}
|
||
|
||
const PaxAttributeKind = enum {
|
||
path,
|
||
linkpath,
|
||
size,
|
||
};
|
||
|
||
// maxInt(u64) has 20 chars, base 10 in practice we got 24 chars
|
||
const pax_max_size_attr_len = 64;
|
||
|
||
fn PaxIterator(comptime ReaderType: type) type {
|
||
return struct {
|
||
size: usize, // cumulative size of all pax attributes
|
||
reader: ReaderType,
|
||
// scratch buffer used for reading attribute length and keyword
|
||
scratch: [128]u8 = undefined,
|
||
|
||
const Self = @This();
|
||
|
||
const Attribute = struct {
|
||
kind: PaxAttributeKind,
|
||
len: usize, // length of the attribute value
|
||
reader: ReaderType, // reader positioned at value start
|
||
|
||
// Copies pax attribute value into destination buffer.
|
||
// Must be called with destination buffer of size at least Attribute.len.
|
||
pub fn value(self: Attribute, dst: []u8) ![]const u8 {
|
||
if (self.len > dst.len) return error.TarInsufficientBuffer;
|
||
// assert(self.len <= dst.len);
|
||
const buf = dst[0..self.len];
|
||
const n = try self.reader.readAll(buf);
|
||
if (n < self.len) return error.UnexpectedEndOfStream;
|
||
try validateAttributeEnding(self.reader);
|
||
if (hasNull(buf)) return error.PaxNullInValue;
|
||
return buf;
|
||
}
|
||
};
|
||
|
||
// Iterates over pax attributes. Returns known only known attributes.
|
||
// Caller has to call value in Attribute, to advance reader across value.
|
||
pub fn next(self: *Self) !?Attribute {
|
||
// Pax extended header consists of one or more attributes, each constructed as follows:
|
||
// "%d %s=%s\n", <length>, <keyword>, <value>
|
||
while (self.size > 0) {
|
||
const length_buf = try self.readUntil(' ');
|
||
const length = try std.fmt.parseInt(usize, length_buf, 10); // record length in bytes
|
||
|
||
const keyword = try self.readUntil('=');
|
||
if (hasNull(keyword)) return error.PaxNullInKeyword;
|
||
|
||
// calculate value_len
|
||
const value_start = length_buf.len + keyword.len + 2; // 2 separators
|
||
if (length < value_start + 1 or self.size < length) return error.UnexpectedEndOfStream;
|
||
const value_len = length - value_start - 1; // \n separator at end
|
||
self.size -= length;
|
||
|
||
const kind: PaxAttributeKind = if (eql(keyword, "path"))
|
||
.path
|
||
else if (eql(keyword, "linkpath"))
|
||
.linkpath
|
||
else if (eql(keyword, "size"))
|
||
.size
|
||
else {
|
||
try self.reader.skipBytes(value_len, .{});
|
||
try validateAttributeEnding(self.reader);
|
||
continue;
|
||
};
|
||
if (kind == .size and value_len > pax_max_size_attr_len) {
|
||
return error.PaxSizeAttrOverflow;
|
||
}
|
||
return Attribute{
|
||
.kind = kind,
|
||
.len = value_len,
|
||
.reader = self.reader,
|
||
};
|
||
}
|
||
|
||
return null;
|
||
}
|
||
|
||
fn readUntil(self: *Self, delimiter: u8) ![]const u8 {
|
||
var fbs = std.io.fixedBufferStream(&self.scratch);
|
||
try self.reader.streamUntilDelimiter(fbs.writer(), delimiter, null);
|
||
return fbs.getWritten();
|
||
}
|
||
|
||
fn eql(a: []const u8, b: []const u8) bool {
|
||
return std.mem.eql(u8, a, b);
|
||
}
|
||
|
||
fn hasNull(str: []const u8) bool {
|
||
return (std.mem.indexOfScalar(u8, str, 0)) != null;
|
||
}
|
||
|
||
// Checks that each record ends with new line.
|
||
fn validateAttributeEnding(reader: ReaderType) !void {
|
||
if (try reader.readByte() != '\n') return error.PaxInvalidAttributeEnd;
|
||
}
|
||
};
|
||
}
|
||
|
||
/// Saves tar file content to the file systems.
|
||
pub fn pipeToFileSystem(dir: std.fs.Dir, reader: anytype, options: PipeOptions) !void {
|
||
var file_name_buffer: [std.fs.max_path_bytes]u8 = undefined;
|
||
var link_name_buffer: [std.fs.max_path_bytes]u8 = undefined;
|
||
var iter = iterator(reader, .{
|
||
.file_name_buffer = &file_name_buffer,
|
||
.link_name_buffer = &link_name_buffer,
|
||
.diagnostics = options.diagnostics,
|
||
});
|
||
|
||
while (try iter.next()) |file| {
|
||
const file_name = stripComponents(file.name, options.strip_components);
|
||
if (file_name.len == 0 and file.kind != .directory) {
|
||
const d = options.diagnostics orelse return error.TarComponentsOutsideStrippedPrefix;
|
||
try d.errors.append(d.allocator, .{ .components_outside_stripped_prefix = .{
|
||
.file_name = try d.allocator.dupe(u8, file.name),
|
||
} });
|
||
continue;
|
||
}
|
||
if (options.diagnostics) |d| {
|
||
try d.findRoot(file_name);
|
||
}
|
||
|
||
switch (file.kind) {
|
||
.directory => {
|
||
if (file_name.len > 0 and !options.exclude_empty_directories) {
|
||
try dir.makePath(file_name);
|
||
}
|
||
},
|
||
.file => {
|
||
if (createDirAndFile(dir, file_name, fileMode(file.mode, options))) |fs_file| {
|
||
defer fs_file.close();
|
||
try file.writeAll(fs_file);
|
||
} else |err| {
|
||
const d = options.diagnostics orelse return err;
|
||
try d.errors.append(d.allocator, .{ .unable_to_create_file = .{
|
||
.code = err,
|
||
.file_name = try d.allocator.dupe(u8, file_name),
|
||
} });
|
||
}
|
||
},
|
||
.sym_link => {
|
||
const link_name = file.link_name;
|
||
createDirAndSymlink(dir, link_name, file_name) catch |err| {
|
||
const d = options.diagnostics orelse return error.UnableToCreateSymLink;
|
||
try d.errors.append(d.allocator, .{ .unable_to_create_sym_link = .{
|
||
.code = err,
|
||
.file_name = try d.allocator.dupe(u8, file_name),
|
||
.link_name = try d.allocator.dupe(u8, link_name),
|
||
} });
|
||
};
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
fn createDirAndFile(dir: std.fs.Dir, file_name: []const u8, mode: std.fs.File.Mode) !std.fs.File {
|
||
const fs_file = dir.createFile(file_name, .{ .exclusive = true, .mode = mode }) catch |err| {
|
||
if (err == error.FileNotFound) {
|
||
if (std.fs.path.dirname(file_name)) |dir_name| {
|
||
try dir.makePath(dir_name);
|
||
return try dir.createFile(file_name, .{ .exclusive = true, .mode = mode });
|
||
}
|
||
}
|
||
return err;
|
||
};
|
||
return fs_file;
|
||
}
|
||
|
||
// Creates a symbolic link at path `file_name` which points to `link_name`.
|
||
fn createDirAndSymlink(dir: std.fs.Dir, link_name: []const u8, file_name: []const u8) !void {
|
||
dir.symLink(link_name, file_name, .{}) catch |err| {
|
||
if (err == error.FileNotFound) {
|
||
if (std.fs.path.dirname(file_name)) |dir_name| {
|
||
try dir.makePath(dir_name);
|
||
return try dir.symLink(link_name, file_name, .{});
|
||
}
|
||
}
|
||
return err;
|
||
};
|
||
}
|
||
|
||
fn stripComponents(path: []const u8, count: u32) []const u8 {
|
||
var i: usize = 0;
|
||
var c = count;
|
||
while (c > 0) : (c -= 1) {
|
||
if (std.mem.indexOfScalarPos(u8, path, i, '/')) |pos| {
|
||
i = pos + 1;
|
||
} else {
|
||
i = path.len;
|
||
break;
|
||
}
|
||
}
|
||
return path[i..];
|
||
}
|
||
|
||
test stripComponents {
|
||
const expectEqualStrings = testing.expectEqualStrings;
|
||
try expectEqualStrings("a/b/c", stripComponents("a/b/c", 0));
|
||
try expectEqualStrings("b/c", stripComponents("a/b/c", 1));
|
||
try expectEqualStrings("c", stripComponents("a/b/c", 2));
|
||
try expectEqualStrings("", stripComponents("a/b/c", 3));
|
||
try expectEqualStrings("", stripComponents("a/b/c", 4));
|
||
}
|
||
|
||
test PaxIterator {
|
||
const Attr = struct {
|
||
kind: PaxAttributeKind,
|
||
value: []const u8 = undefined,
|
||
err: ?anyerror = null,
|
||
};
|
||
const cases = [_]struct {
|
||
data: []const u8,
|
||
attrs: []const Attr,
|
||
err: ?anyerror = null,
|
||
}{
|
||
.{ // valid but unknown keys
|
||
.data =
|
||
\\30 mtime=1350244992.023960108
|
||
\\6 k=1
|
||
\\13 key1=val1
|
||
\\10 a=name
|
||
\\9 a=name
|
||
\\
|
||
,
|
||
.attrs = &[_]Attr{},
|
||
},
|
||
.{ // mix of known and unknown keys
|
||
.data =
|
||
\\6 k=1
|
||
\\13 path=name
|
||
\\17 linkpath=link
|
||
\\13 key1=val1
|
||
\\12 size=123
|
||
\\13 key2=val2
|
||
\\
|
||
,
|
||
.attrs = &[_]Attr{
|
||
.{ .kind = .path, .value = "name" },
|
||
.{ .kind = .linkpath, .value = "link" },
|
||
.{ .kind = .size, .value = "123" },
|
||
},
|
||
},
|
||
.{ // too short size of the second key-value pair
|
||
.data =
|
||
\\13 path=name
|
||
\\10 linkpath=value
|
||
\\
|
||
,
|
||
.attrs = &[_]Attr{
|
||
.{ .kind = .path, .value = "name" },
|
||
},
|
||
.err = error.UnexpectedEndOfStream,
|
||
},
|
||
.{ // too long size of the second key-value pair
|
||
.data =
|
||
\\13 path=name
|
||
\\6 k=1
|
||
\\19 linkpath=value
|
||
\\
|
||
,
|
||
.attrs = &[_]Attr{
|
||
.{ .kind = .path, .value = "name" },
|
||
},
|
||
.err = error.UnexpectedEndOfStream,
|
||
},
|
||
|
||
.{ // too long size of the second key-value pair
|
||
.data =
|
||
\\13 path=name
|
||
\\19 linkpath=value
|
||
\\6 k=1
|
||
\\
|
||
,
|
||
.attrs = &[_]Attr{
|
||
.{ .kind = .path, .value = "name" },
|
||
.{ .kind = .linkpath, .err = error.PaxInvalidAttributeEnd },
|
||
},
|
||
},
|
||
.{ // null in keyword is not valid
|
||
.data = "13 path=name\n" ++ "7 k\x00b=1\n",
|
||
.attrs = &[_]Attr{
|
||
.{ .kind = .path, .value = "name" },
|
||
},
|
||
.err = error.PaxNullInKeyword,
|
||
},
|
||
.{ // null in value is not valid
|
||
.data = "23 path=name\x00with null\n",
|
||
.attrs = &[_]Attr{
|
||
.{ .kind = .path, .err = error.PaxNullInValue },
|
||
},
|
||
},
|
||
.{ // 1000 characters path
|
||
.data = "1011 path=" ++ "0123456789" ** 100 ++ "\n",
|
||
.attrs = &[_]Attr{
|
||
.{ .kind = .path, .value = "0123456789" ** 100 },
|
||
},
|
||
},
|
||
};
|
||
var buffer: [1024]u8 = undefined;
|
||
|
||
outer: for (cases) |case| {
|
||
var stream = std.io.fixedBufferStream(case.data);
|
||
var iter = paxIterator(stream.reader(), case.data.len);
|
||
|
||
var i: usize = 0;
|
||
while (iter.next() catch |err| {
|
||
if (case.err) |e| {
|
||
try testing.expectEqual(e, err);
|
||
continue;
|
||
}
|
||
return err;
|
||
}) |attr| : (i += 1) {
|
||
const exp = case.attrs[i];
|
||
try testing.expectEqual(exp.kind, attr.kind);
|
||
const value = attr.value(&buffer) catch |err| {
|
||
if (exp.err) |e| {
|
||
try testing.expectEqual(e, err);
|
||
break :outer;
|
||
}
|
||
return err;
|
||
};
|
||
try testing.expectEqualStrings(exp.value, value);
|
||
}
|
||
try testing.expectEqual(case.attrs.len, i);
|
||
try testing.expect(case.err == null);
|
||
}
|
||
}
|
||
|
||
test {
|
||
_ = @import("tar/test.zig");
|
||
_ = @import("tar/writer.zig");
|
||
_ = Diagnostics;
|
||
}
|
||
|
||
test "header parse size" {
|
||
const cases = [_]struct {
|
||
in: []const u8,
|
||
want: u64 = 0,
|
||
err: ?anyerror = null,
|
||
}{
|
||
// Test base-256 (binary) encoded values.
|
||
.{ .in = "", .want = 0 },
|
||
.{ .in = "\x80", .want = 0 },
|
||
.{ .in = "\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01", .want = 1 },
|
||
.{ .in = "\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x02", .want = 0x0102 },
|
||
.{ .in = "\x80\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08", .want = 0x0102030405060708 },
|
||
.{ .in = "\x80\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09", .err = error.TarNumericValueTooBig },
|
||
.{ .in = "\x80\x00\x00\x00\x07\x76\xa2\x22\xeb\x8a\x72\x61", .want = 537795476381659745 },
|
||
.{ .in = "\x80\x80\x80\x00\x01\x02\x03\x04\x05\x06\x07\x08", .err = error.TarNumericValueTooBig },
|
||
|
||
// // Test base-8 (octal) encoded values.
|
||
.{ .in = "00000000227\x00", .want = 0o227 },
|
||
.{ .in = " 000000227\x00", .want = 0o227 },
|
||
.{ .in = "00000000228\x00", .err = error.TarHeader },
|
||
.{ .in = "11111111111\x00", .want = 0o11111111111 },
|
||
};
|
||
|
||
for (cases) |case| {
|
||
var bytes = [_]u8{0} ** Header.SIZE;
|
||
@memcpy(bytes[124 .. 124 + case.in.len], case.in);
|
||
var header = Header{ .bytes = &bytes };
|
||
if (case.err) |err| {
|
||
try testing.expectError(err, header.size());
|
||
} else {
|
||
try testing.expectEqual(case.want, try header.size());
|
||
}
|
||
}
|
||
}
|
||
|
||
test "header parse mode" {
|
||
const cases = [_]struct {
|
||
in: []const u8,
|
||
want: u64 = 0,
|
||
err: ?anyerror = null,
|
||
}{
|
||
.{ .in = "0000644\x00", .want = 0o644 },
|
||
.{ .in = "0000777\x00", .want = 0o777 },
|
||
.{ .in = "7777777\x00", .want = 0o7777777 },
|
||
.{ .in = "7777778\x00", .err = error.TarHeader },
|
||
.{ .in = "77777777", .want = 0o77777777 },
|
||
.{ .in = "777777777777", .want = 0o77777777 },
|
||
};
|
||
for (cases) |case| {
|
||
var bytes = [_]u8{0} ** Header.SIZE;
|
||
@memcpy(bytes[100 .. 100 + case.in.len], case.in);
|
||
var header = Header{ .bytes = &bytes };
|
||
if (case.err) |err| {
|
||
try testing.expectError(err, header.mode());
|
||
} else {
|
||
try testing.expectEqual(case.want, try header.mode());
|
||
}
|
||
}
|
||
}
|
||
|
||
test "create file and symlink" {
|
||
var root = testing.tmpDir(.{});
|
||
defer root.cleanup();
|
||
|
||
var file = try createDirAndFile(root.dir, "file1", default_mode);
|
||
file.close();
|
||
file = try createDirAndFile(root.dir, "a/b/c/file2", default_mode);
|
||
file.close();
|
||
|
||
createDirAndSymlink(root.dir, "a/b/c/file2", "symlink1") catch |err| {
|
||
// On Windows when developer mode is not enabled
|
||
if (err == error.AccessDenied) return error.SkipZigTest;
|
||
return err;
|
||
};
|
||
try createDirAndSymlink(root.dir, "../../../file1", "d/e/f/symlink2");
|
||
|
||
// Danglink symlnik, file created later
|
||
try createDirAndSymlink(root.dir, "../../../g/h/i/file4", "j/k/l/symlink3");
|
||
file = try createDirAndFile(root.dir, "g/h/i/file4", default_mode);
|
||
file.close();
|
||
}
|
||
|
||
test iterator {
|
||
// Example tar file is created from this tree structure:
|
||
// $ tree example
|
||
// example
|
||
// ├── a
|
||
// │ └── file
|
||
// ├── b
|
||
// │ └── symlink -> ../a/file
|
||
// └── empty
|
||
// $ cat example/a/file
|
||
// content
|
||
// $ tar -cf example.tar example
|
||
// $ tar -tvf example.tar
|
||
// example/
|
||
// example/b/
|
||
// example/b/symlink -> ../a/file
|
||
// example/a/
|
||
// example/a/file
|
||
// example/empty/
|
||
|
||
const data = @embedFile("tar/testdata/example.tar");
|
||
var fbs = std.io.fixedBufferStream(data);
|
||
|
||
// User provided buffers to the iterator
|
||
var file_name_buffer: [std.fs.max_path_bytes]u8 = undefined;
|
||
var link_name_buffer: [std.fs.max_path_bytes]u8 = undefined;
|
||
// Create iterator
|
||
var iter = iterator(fbs.reader(), .{
|
||
.file_name_buffer = &file_name_buffer,
|
||
.link_name_buffer = &link_name_buffer,
|
||
});
|
||
// Iterate over files in example.tar
|
||
var file_no: usize = 0;
|
||
while (try iter.next()) |file| : (file_no += 1) {
|
||
switch (file.kind) {
|
||
.directory => {
|
||
switch (file_no) {
|
||
0 => try testing.expectEqualStrings("example/", file.name),
|
||
1 => try testing.expectEqualStrings("example/b/", file.name),
|
||
3 => try testing.expectEqualStrings("example/a/", file.name),
|
||
5 => try testing.expectEqualStrings("example/empty/", file.name),
|
||
else => unreachable,
|
||
}
|
||
},
|
||
.file => {
|
||
try testing.expectEqualStrings("example/a/file", file.name);
|
||
// Read file content
|
||
var buf: [16]u8 = undefined;
|
||
const n = try file.reader().readAll(&buf);
|
||
try testing.expectEqualStrings("content\n", buf[0..n]);
|
||
},
|
||
.sym_link => {
|
||
try testing.expectEqualStrings("example/b/symlink", file.name);
|
||
try testing.expectEqualStrings("../a/file", file.link_name);
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
test pipeToFileSystem {
|
||
// Example tar file is created from this tree structure:
|
||
// $ tree example
|
||
// example
|
||
// ├── a
|
||
// │ └── file
|
||
// ├── b
|
||
// │ └── symlink -> ../a/file
|
||
// └── empty
|
||
// $ cat example/a/file
|
||
// content
|
||
// $ tar -cf example.tar example
|
||
// $ tar -tvf example.tar
|
||
// example/
|
||
// example/b/
|
||
// example/b/symlink -> ../a/file
|
||
// example/a/
|
||
// example/a/file
|
||
// example/empty/
|
||
|
||
const data = @embedFile("tar/testdata/example.tar");
|
||
var fbs = std.io.fixedBufferStream(data);
|
||
const reader = fbs.reader();
|
||
|
||
var tmp = testing.tmpDir(.{ .no_follow = true });
|
||
defer tmp.cleanup();
|
||
const dir = tmp.dir;
|
||
|
||
// Save tar from `reader` to the file system `dir`
|
||
pipeToFileSystem(dir, reader, .{
|
||
.mode_mode = .ignore,
|
||
.strip_components = 1,
|
||
.exclude_empty_directories = true,
|
||
}) catch |err| {
|
||
// Skip on platform which don't support symlinks
|
||
if (err == error.UnableToCreateSymLink) return error.SkipZigTest;
|
||
return err;
|
||
};
|
||
|
||
try testing.expectError(error.FileNotFound, dir.statFile("empty"));
|
||
try testing.expect((try dir.statFile("a/file")).kind == .file);
|
||
try testing.expect((try dir.statFile("b/symlink")).kind == .file); // statFile follows symlink
|
||
|
||
var buf: [32]u8 = undefined;
|
||
try testing.expectEqualSlices(
|
||
u8,
|
||
"../a/file",
|
||
normalizePath(try dir.readLink("b/symlink", &buf)),
|
||
);
|
||
}
|
||
|
||
test "pipeToFileSystem root_dir" {
|
||
const data = @embedFile("tar/testdata/example.tar");
|
||
var fbs = std.io.fixedBufferStream(data);
|
||
const reader = fbs.reader();
|
||
|
||
// with strip_components = 1
|
||
{
|
||
var tmp = testing.tmpDir(.{ .no_follow = true });
|
||
defer tmp.cleanup();
|
||
var diagnostics: Diagnostics = .{ .allocator = testing.allocator };
|
||
defer diagnostics.deinit();
|
||
|
||
pipeToFileSystem(tmp.dir, reader, .{
|
||
.strip_components = 1,
|
||
.diagnostics = &diagnostics,
|
||
}) catch |err| {
|
||
// Skip on platform which don't support symlinks
|
||
if (err == error.UnableToCreateSymLink) return error.SkipZigTest;
|
||
return err;
|
||
};
|
||
|
||
// there is no root_dir
|
||
try testing.expectEqual(0, diagnostics.root_dir.len);
|
||
try testing.expectEqual(5, diagnostics.entries);
|
||
}
|
||
|
||
// with strip_components = 0
|
||
{
|
||
fbs.reset();
|
||
var tmp = testing.tmpDir(.{ .no_follow = true });
|
||
defer tmp.cleanup();
|
||
var diagnostics: Diagnostics = .{ .allocator = testing.allocator };
|
||
defer diagnostics.deinit();
|
||
|
||
pipeToFileSystem(tmp.dir, reader, .{
|
||
.strip_components = 0,
|
||
.diagnostics = &diagnostics,
|
||
}) catch |err| {
|
||
// Skip on platform which don't support symlinks
|
||
if (err == error.UnableToCreateSymLink) return error.SkipZigTest;
|
||
return err;
|
||
};
|
||
|
||
// root_dir found
|
||
try testing.expectEqualStrings("example", diagnostics.root_dir);
|
||
try testing.expectEqual(6, diagnostics.entries);
|
||
}
|
||
}
|
||
|
||
test "findRoot without explicit root dir" {
|
||
const data = @embedFile("tar/testdata/19820.tar");
|
||
var fbs = std.io.fixedBufferStream(data);
|
||
const reader = fbs.reader();
|
||
|
||
var tmp = testing.tmpDir(.{});
|
||
defer tmp.cleanup();
|
||
|
||
var diagnostics: Diagnostics = .{ .allocator = testing.allocator };
|
||
defer diagnostics.deinit();
|
||
try pipeToFileSystem(tmp.dir, reader, .{ .diagnostics = &diagnostics });
|
||
|
||
try testing.expectEqualStrings("root", diagnostics.root_dir);
|
||
}
|
||
|
||
test "pipeToFileSystem strip_components" {
|
||
const data = @embedFile("tar/testdata/example.tar");
|
||
var fbs = std.io.fixedBufferStream(data);
|
||
const reader = fbs.reader();
|
||
|
||
var tmp = testing.tmpDir(.{ .no_follow = true });
|
||
defer tmp.cleanup();
|
||
var diagnostics: Diagnostics = .{ .allocator = testing.allocator };
|
||
defer diagnostics.deinit();
|
||
|
||
pipeToFileSystem(tmp.dir, reader, .{
|
||
.strip_components = 3,
|
||
.diagnostics = &diagnostics,
|
||
}) catch |err| {
|
||
// Skip on platform which don't support symlinks
|
||
if (err == error.UnableToCreateSymLink) return error.SkipZigTest;
|
||
return err;
|
||
};
|
||
|
||
try testing.expectEqual(2, diagnostics.errors.items.len);
|
||
try testing.expectEqualStrings("example/b/symlink", diagnostics.errors.items[0].components_outside_stripped_prefix.file_name);
|
||
try testing.expectEqualStrings("example/a/file", diagnostics.errors.items[1].components_outside_stripped_prefix.file_name);
|
||
}
|
||
|
||
fn normalizePath(bytes: []u8) []u8 {
|
||
const canonical_sep = std.fs.path.sep_posix;
|
||
if (std.fs.path.sep == canonical_sep) return bytes;
|
||
std.mem.replaceScalar(u8, bytes, std.fs.path.sep, canonical_sep);
|
||
return bytes;
|
||
}
|
||
|
||
const default_mode = std.fs.File.default_mode;
|
||
|
||
// File system mode based on tar header mode and mode_mode options.
|
||
fn fileMode(mode: u32, options: PipeOptions) std.fs.File.Mode {
|
||
if (!std.fs.has_executable_bit or options.mode_mode == .ignore)
|
||
return default_mode;
|
||
|
||
const S = std.posix.S;
|
||
|
||
// The mode from the tar file is inspected for the owner executable bit.
|
||
if (mode & S.IXUSR == 0)
|
||
return default_mode;
|
||
|
||
// This bit is copied to the group and other executable bits.
|
||
// Other bits of the mode are left as the default when creating files.
|
||
return default_mode | S.IXUSR | S.IXGRP | S.IXOTH;
|
||
}
|
||
|
||
test fileMode {
|
||
if (!std.fs.has_executable_bit) return error.SkipZigTest;
|
||
try testing.expectEqual(default_mode, fileMode(0o744, PipeOptions{ .mode_mode = .ignore }));
|
||
try testing.expectEqual(0o777, fileMode(0o744, PipeOptions{}));
|
||
try testing.expectEqual(0o666, fileMode(0o644, PipeOptions{}));
|
||
try testing.expectEqual(0o666, fileMode(0o655, PipeOptions{}));
|
||
}
|
||
|
||
test "executable bit" {
|
||
if (!std.fs.has_executable_bit) return error.SkipZigTest;
|
||
|
||
const S = std.posix.S;
|
||
const data = @embedFile("tar/testdata/example.tar");
|
||
|
||
for ([_]PipeOptions.ModeMode{ .ignore, .executable_bit_only }) |opt| {
|
||
var fbs = std.io.fixedBufferStream(data);
|
||
const reader = fbs.reader();
|
||
|
||
var tmp = testing.tmpDir(.{ .no_follow = true });
|
||
//defer tmp.cleanup();
|
||
|
||
pipeToFileSystem(tmp.dir, reader, .{
|
||
.strip_components = 1,
|
||
.exclude_empty_directories = true,
|
||
.mode_mode = opt,
|
||
}) catch |err| {
|
||
// Skip on platform which don't support symlinks
|
||
if (err == error.UnableToCreateSymLink) return error.SkipZigTest;
|
||
return err;
|
||
};
|
||
|
||
const fs = try tmp.dir.statFile("a/file");
|
||
try testing.expect(fs.kind == .file);
|
||
|
||
if (opt == .executable_bit_only) {
|
||
// Executable bit is set for user, group and others
|
||
try testing.expect(fs.mode & S.IXUSR > 0);
|
||
try testing.expect(fs.mode & S.IXGRP > 0);
|
||
try testing.expect(fs.mode & S.IXOTH > 0);
|
||
}
|
||
if (opt == .ignore) {
|
||
try testing.expect(fs.mode & S.IXUSR == 0);
|
||
try testing.expect(fs.mode & S.IXGRP == 0);
|
||
try testing.expect(fs.mode & S.IXOTH == 0);
|
||
}
|
||
}
|
||
}
|