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wip turbonss-unix2systemd

This commit is contained in:
Motiejus Jakštys 2022-08-20 19:08:04 +03:00
parent b350e8d096
commit 8bfc4a30cd
1 changed files with 305 additions and 0 deletions

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const std = @import("std");
const fs = std.fs;
const io = std.io;
const mem = std.mem;
const os = std.os;
const heap = std.heap;
const math = std.math;
const fmt = std.fmt;
const json = std.json;
const ArrayList = std.ArrayList;
const ArrayListUnmanaged = std.ArrayListUnmanaged;
const Allocator = std.mem.Allocator;
const StringArrayHashMap = std.StringArrayHashMap;
const flags = @import("flags.zig");
const User = @import("User.zig");
const PackedUser = @import("PackedUser.zig");
const Group = @import("Group.zig");
const Corpus = @import("Corpus.zig");
const DB = @import("DB.zig");
const ErrCtx = @import("ErrCtx.zig");
const usage =
\\usage: turbonss-unix2systemd [OPTION]...
\\
\\Options:
\\ -h Print this help message and exit
\\ --passwd Path to passwd file (default: passwd)
\\ --group Path to group file (default: group)
\\ --outdir Path to output directory (default: ./userdb)
\\
;
pub fn main() !void {
// This line is here because of https://github.com/ziglang/zig/issues/7807
const argv: []const [*:0]const u8 = os.argv;
const gpa = heap.raw_c_allocator;
const stderr = io.getStdErr().writer();
const stdout = io.getStdOut().writer();
const return_code = execute(gpa, stdout, stderr, argv[1..]);
os.exit(return_code);
}
fn execute(
allocator: Allocator,
stdout: anytype,
stderr: anytype,
argv: []const [*:0]const u8,
) u8 {
const result = flags.parse(argv, &[_]flags.Flag{
.{ .name = "-h", .kind = .boolean },
.{ .name = "--passwd", .kind = .arg },
.{ .name = "--group", .kind = .arg },
.{ .name = "--outdir", .kind = .arg },
}) catch {
stderr.writeAll(usage) catch {};
return 1;
};
if (result.boolFlag("-h")) {
stdout.writeAll(usage) catch return 1;
return 0;
}
if (result.args.len != 0) {
stderr.print("ERROR: unknown option '{s}'\n", .{result.args[0]}) catch {};
stderr.writeAll(usage) catch {};
return 1;
}
const passwd_fname = result.argFlag("--passwd") orelse "passwd";
const group_fname = result.argFlag("--group") orelse "group";
const outdir = result.argFlag("--outdir") orelse "./userdb";
// to catch an error set file.OpenError, wait for
// https://github.com/ziglang/zig/issues/2473
var errc = ErrCtx{};
var passwd_file = fs.cwd().openFile(passwd_fname, .{ .mode = .read_only }) catch |err|
return fail(errc.wrapf("open '{s}'", .{passwd_fname}), stderr, err);
defer passwd_file.close();
var group_file = fs.cwd().openFile(group_fname, .{ .mode = .read_only }) catch |err|
return fail(errc.wrapf("open '{s}'", .{group_fname}), stderr, err);
defer group_file.close();
var passwdReader = io.bufferedReader(passwd_file.reader()).reader();
var users = User.fromReader(allocator, &errc, passwdReader) catch |err|
return fail(errc.wrap("read users"), stderr, err);
defer {
for (users) |*user| user.deinit(allocator);
allocator.free(users);
}
var groupReader = io.bufferedReader(group_file.reader()).reader();
var groups = Group.fromReader(allocator, groupReader) catch |err|
return fail(errc.wrap("read groups"), stderr, err);
defer {
for (groups) |*group| group.deinit(allocator);
allocator.free(groups);
}
const user2groups = StringArrayHashMap(ArrayListUnmanaged([]const u8)).init(allocator);
defer {
var it = user2groups.iterator();
while (it.next()) |entry|
entry.value_ptr.*.deinit(allocator);
user2groups.deinit();
}
fillMemberships(allocator, groups, &user2groups);
try os.mkdirZ(outdir, 0o755) catch |err| switch (err) {
error.PathAlreadyExists => {},
else => |err| return err,
};
var dir = try fs.cwd().openDir(outdir, .{});
try makePasswd(dir, users.items);
try makeGroups(dir, groups.items);
return 0;
}
const JSONPasswd = struct {
uid: u32,
gid: u32,
userName: []const u8, // pw_name
realName: []const u8, // pw_gecos
homeDirectory: []const u8,
shell: []const u8,
memberOf: []const []const u8,
};
fn makePasswd(
dir: fs.Dir,
users: []User,
memberships: *const StringArrayHashMap(ArrayListUnmanaged([]const u8)),
) !void {
var namebuf: [PackedUser.max_name_len + ".user".len:0]u8 = undefined;
var symlinkbuf: [fmt.count("{d}.user", math.maxInt(u32)):0]u8 = undefined;
for (users) |user| {
const member_of = if (memberships.get(user.name)) |m|
m.items
else
[]const []const u8{};
const u = JSONPasswd{
.uid = user.uid,
.gid = user.gid,
.userName = user.name,
.realName = user.gecos,
.homeDirectory = user.home,
.shell = user.shell,
.memberOf = member_of,
};
const fname = try fmt.bufPrintZ(namebuf, "{s}.user", user.name);
var f = try dir.createFileZ(fname, .{});
defer f.close();
var wr = io.bufferedWriter(f.writer());
try json.stringify(u, .{}, wr);
try wr.flush();
const symlinkname = try fmt.bufPrintZ(symlinkbuf, "{d}.user", user.uid);
try os.symlinkatZ(fname, dir.fd, symlinkname);
}
}
fn makeGroups(dir: fs.Dir, groups: []Group) !void {
_ = dir;
_ = groups;
}
fn fail(errc: *ErrCtx, stderr: anytype, err: anytype) u8 {
const err_chain = errc.unwrap().constSlice();
stderr.print("ERROR {s}: {s}\n", .{ @errorName(err), err_chain }) catch {};
return 1;
}
fn fillMemberships(
allocator: Allocator,
groups: ArrayList(Group),
user2groups: *StringArrayHashMap(ArrayListUnmanaged([]const u8)),
) void {
for (groups) |group| {
for (group.members) |member| {
const member_groups = try user2groups.getOrPut(allocator, member.name);
if (!member_groups.found_existing)
member_groups.value_ptr.* = ArrayListUnmanaged([]const u8){};
member_groups.value_ptr.*.append(group.name);
}
}
}
const testing = std.testing;
test "turbonss-unix2systemd invalid argument" {
const allocator = testing.allocator;
const args = &[_][*:0]const u8{"--invalid-argument"};
var stderr = ArrayList(u8).init(allocator);
defer stderr.deinit();
var stdout = ArrayList(u8).init(allocator);
defer stdout.deinit();
const exit_code = execute(allocator, stdout.writer(), stderr.writer(), args[0..]);
try testing.expectEqual(@as(u8, 1), exit_code);
try testing.expect(mem.startsWith(
u8,
stderr.items,
"ERROR: unknown option '--invalid-argument'",
));
}
test "turbonss-unix2systemd trivial error: missing passwd file" {
const allocator = testing.allocator;
const args = &[_][*:0]const u8{
"--passwd",
"/does/not/exist/passwd",
"--group",
"/does/not/exist/group",
};
var stderr = ArrayList(u8).init(allocator);
defer stderr.deinit();
var stdout = ArrayList(u8).init(allocator);
defer stdout.deinit();
const exit_code = execute(allocator, stdout.writer(), stderr.writer(), args[0..]);
try testing.expectEqual(@as(u8, 1), exit_code);
try testing.expectEqualStrings(stderr.items, "ERROR FileNotFound: open '/does/not/exist/passwd'\n");
}
test "turbonss-unix2systemd fail" {
var errc = ErrCtx{};
var buf = ArrayList(u8).init(testing.allocator);
defer buf.deinit();
var wr = buf.writer();
const exit_code = fail(errc.wrapf("invalid user 'foo'", .{}), wr, error.NotSure);
try testing.expectEqual(exit_code, 1);
try testing.expectEqualStrings(buf.items, "ERROR NotSure: invalid user 'foo'\n");
}
test "turbonss-unix2db smoke test" {
const allocator = testing.allocator;
var stderr = ArrayList(u8).init(allocator);
defer stderr.deinit();
var stdout = ArrayList(u8).init(allocator);
defer stdout.deinit();
var corpus = try Corpus.testCorpus(allocator);
defer corpus.deinit();
var tmp = testing.tmpDir(.{});
// TODO: defer
errdefer tmp.cleanup();
const tmp_path = blk: {
const relative_path = try fs.path.join(allocator, &[_][]const u8{
"zig-cache",
"tmp",
tmp.sub_path[0..],
});
const real_path = try fs.realpathAlloc(allocator, relative_path);
allocator.free(relative_path);
break :blk real_path;
};
defer allocator.free(tmp_path);
const passwdPath = try fs.path.joinZ(allocator, &[_][]const u8{ tmp_path, "passwd" });
defer allocator.free(passwdPath);
const groupPath = try fs.path.joinZ(allocator, &[_][]const u8{ tmp_path, "group" });
defer allocator.free(groupPath);
const outDir = try fs.path.joinZ(allocator, &[_][]const u8{ tmp_path, "outdir" });
defer allocator.free(outDir);
const passwd_fd = try os.open(passwdPath, os.O.CREAT | os.O.WRONLY, 0o644);
const group_fd = try os.open(groupPath, os.O.CREAT | os.O.WRONLY, 0o644);
var i: usize = 0;
while (i < corpus.users.len) : (i += 1) {
const user = corpus.users.get(i);
const line = user.toLine().constSlice();
_ = try os.write(passwd_fd, line);
}
os.close(passwd_fd);
var group_writer = (fs.File{ .handle = group_fd }).writer();
i = 0;
while (i < corpus.groups.len) : (i += 1)
try corpus.groups.get(i).writeTo(group_writer);
os.close(group_fd);
const args = &[_][*:0]const u8{
"--passwd", passwdPath,
"--group", groupPath,
"--outdir", outDir,
};
const exit_code = execute(allocator, stdout.writer(), stderr.writer(), args);
try testing.expectEqualStrings("total 1664 bytes. groups=5 users=4\n", stderr.items);
try testing.expectEqual(@as(u8, 0), exit_code);
}