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// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
//
// SPDX-License-Identifier: AGPL-3.0-or-later
const std = @import("std");
const sysexchange = @import("sysexchange.zig");
const userinit = @import("userinit.zig");
const vfs = @import("vfs.zig");
const Result = sysexchange.Result;
const io = std.io;
const tar = std.tar;
const File = tar.Iterator(io.FixedBufferStream([]const u8).Reader).File;
pub const Error = error{
NoTarFileInitializer,
};
pub fn provideBuiltin() !void {
try provideUserinit();
}
fn provideUserinit() !void {
try addDir("/userinit");
var userinit_stream = io.fixedBufferStream(userinit.tarball);
const reader = userinit_stream.reader();
var file_name_buffer: [4086]u8 = undefined;
var link_name_buffer: [4086]u8 = undefined;
var path_buffer: [4096]u8 = undefined;
var it = tar.iterator(reader, .{
.file_name_buffer = file_name_buffer[0..],
.link_name_buffer = link_name_buffer[0..],
});
while (try it.next()) |file| {
const path = try std.fmt.bufPrint(path_buffer[0..], "/userinit/{s}", .{file.name});
switch (file.kind) {
.file => try addFile(path, file),
.directory => try addDir(path),
.sym_link => {},
}
}
}
fn addFile(path: []const u8, file: File) !void {
const allocator = vfs.treeRoot().allocator;
const initializer = try allocator.create(File);
initializer.* = file;
try vfs.provideResource(path, .{
.tag = .file,
.data = .{
.file = .{
.openFn = open,
.readFn = read,
.writeFn = null,
.closeFn = close,
.initializer = initializer,
},
},
}, 0);
}
fn addDir(path: []const u8) !void {
const allocator = vfs.treeRoot().allocator;
const tree = try allocator.create(vfs.Tree);
tree.* = vfs.Tree.init(allocator);
try vfs.provideResource(path, .{
.tag = .dir,
.data = .{ .dir = tree },
}, 0);
}
fn open(initializer: ?*anyopaque, _: u16) callconv(.C) Result(*anyopaque) {
const file_template: *File = @alignCast(@ptrCast(initializer orelse {
return Result(*anyopaque).fromAnyTypeOrError(Error.NoTarFileInitializer);
}));
const allocator = vfs.treeRoot().allocator;
const context = allocator.create(File) catch |err| {
return Result(*anyopaque).fromAnyTypeOrError(err);
};
context.* = file_template.*;
return Result(*anyopaque).fromAnyTypeOrError(context);
}
fn read(context: *anyopaque, ptr: [*]u8, len: usize) callconv(.C) Result(usize) {
const ctx: *File = @alignCast(@ptrCast(context));
const buffer = ptr[0..len];
return Result(usize).fromAnyTypeOrError(ctx.read(buffer));
}
fn close(context: *anyopaque) callconv(.C) void {
const ctx: *File = @alignCast(@ptrCast(context));
const allocator = vfs.treeRoot().allocator;
allocator.destroy(ctx);
}
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