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cloning users and groups

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Motiejus Jakštys 2022-03-01 11:01:45 +02:00 committed by Motiejus Jakštys
parent 7df1296ce1
commit 3c4455efeb
3 changed files with 145 additions and 25 deletions
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52
src/group.zig
View File

@ -7,11 +7,28 @@ const InvalidRecord = validate.InvalidRecord;
const mem = std.mem;
const Allocator = mem.Allocator;
const ArrayList = std.ArrayList;
const BufSet = std.BufSet;
pub const Group = struct {
gid: u32,
name: []const u8,
members: std.BufSet,
members: BufSet,
pub fn clone(self: *const Group, allocator: Allocator) Allocator.Error!Group {
var name = try allocator.alloc(u8, self.name.len);
mem.copy(u8, name, self.name);
return Group{
.gid = self.gid,
.name = name,
.members = try self.members.cloneWithAllocator(allocator),
};
}
pub fn deinit(self: *Group, allocator: Allocator) void {
allocator.free(self.name);
self.members.deinit();
self.* = undefined;
}
};
const GroupStored = struct {
@ -119,6 +136,18 @@ const PackedGroup = struct {
const testing = std.testing;
// someMembers constructs a bufset from an allocator and a list of strings.
pub fn someMembers(
allocator: Allocator,
members: []const []const u8,
) Allocator.Error!BufSet {
var bufset = BufSet.init(allocator);
for (members) |member| {
try bufset.insert(member);
}
return bufset;
}
test "PackedGroup alignment" {
try testing.expectEqual(@sizeOf(PackedGroup) * 8, @bitSizeOf(PackedGroup));
}
@ -155,3 +184,24 @@ test "construct PackedGroups" {
try testing.expectEqual(groups.len, i);
}
}
test "Group.clone" {
var allocator = testing.allocator;
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
var members = BufSet.init(allocator);
try members.insert("member1");
try members.insert("member2");
defer members.deinit();
var cloned = try members.cloneWithAllocator(arena.allocator());
cloned.remove("member1");
try cloned.insert("member4");
try testing.expect(members.contains("member1"));
try testing.expect(!members.contains("member4"));
try testing.expect(!cloned.contains("member1"));
try testing.expect(cloned.contains("member4"));
}

62
src/sections.zig
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@ -44,8 +44,12 @@ const Corpus = struct {
var users = try allocator.alloc(User, usersConst.len);
var groups = try allocator.alloc(Group, groupsConst.len);
std.mem.copy(User, users, usersConst);
std.mem.copy(Group, groups, groupsConst);
for (usersConst) |user, i| {
users[i] = try user.clone(allocator);
}
for (groupsConst) |group, i| {
groups[i] = try group.clone(allocator);
}
sort.sort(User, users, {}, cmpUser);
sort.sort(Group, groups, {}, cmpGroup);
@ -84,8 +88,10 @@ const Corpus = struct {
var groupname2users = StringHashMap(ArrayList(*const User)).init(allocator);
var username2groups = StringHashMap(ArrayList(*const Group)).init(allocator);
for (groups) |group| {
const cnt = group.members.count();
var members = try ArrayList(*const User).initCapacity(allocator, cnt);
var members = try ArrayList(*const User).initCapacity(
allocator,
group.members.count(),
);
var it = group.members.iterator();
while (it.next()) |memberName| {
@ -95,15 +101,11 @@ const Corpus = struct {
return error.NotFound;
}
var groupUsers: *ArrayList(*const Group) = undefined;
var result = try username2groups.getOrPut(memberName.*);
if (!result.found_existing) {
groupUsers = &ArrayList(*const Group).init(allocator);
result.value_ptr = groupUsers;
} else {
groupUsers = result.value_ptr;
var groupsOfMember = try username2groups.getOrPut(memberName.*);
if (!groupsOfMember.found_existing) {
groupsOfMember.value_ptr.* = ArrayList(*const Group).init(allocator);
}
try groupUsers.*.append(&group);
try groupsOfMember.value_ptr.*.append(&group);
}
var result = try groupname2users.getOrPut(group.name);
@ -156,14 +158,6 @@ fn cmpGroup(_: void, a: Group, b: Group) bool {
const testing = std.testing;
fn someMembers(allocator: Allocator, members: []const []const u8) !BufSet {
var bufset = BufSet.init(allocator);
for (members) |member| {
try bufset.insert(member);
}
return bufset;
}
test "test corpus" {
const allocator = testing.allocator;
@ -190,13 +184,22 @@ test "test corpus" {
.shell = "/",
} };
var members1 = try someMembers(allocator, &[_][]const u8{"vidmantas"});
var members1 = try groupImport.someMembers(
allocator,
&[_][]const u8{"vidmantas"},
);
defer members1.deinit();
var members2 = try someMembers(allocator, &[_][]const u8{ "svc-bar", "Name" ** 8 });
var members2 = try groupImport.someMembers(
allocator,
&[_][]const u8{ "svc-bar", "Name" ** 8 },
);
defer members2.deinit();
var members3 = try someMembers(allocator, &[_][]const u8{});
var members3 = try groupImport.someMembers(
allocator,
&[_][]const u8{ "svc-bar", "Name" ** 8, "vidmantas" },
);
defer members3.deinit();
var groups = [_]Group{ Group{
@ -209,7 +212,7 @@ test "test corpus" {
.members = members2,
}, Group{
.gid = 9999,
.name = "empty",
.name = "all",
.members = members3,
} };
@ -218,6 +221,17 @@ test "test corpus" {
try testing.expectEqualStrings(corpus.users[0].name, "Name" ** 8);
try testing.expectEqualStrings(corpus.users[1].name, "svc-bar");
try testing.expectEqualStrings(corpus.users[2].name, "vidmantas");
//if (corpus.uid2user.get(1000)) |user| {
// std.debug.print("user: {s}\n", .{user});
// std.debug.print("user.*.name: {d}\n", .{user.*.name});
// try testing.expectEqualStrings(user.*.name, "vidmantas");
//} else {
// try testing.expect(false);
//}
//try testing.expectEqualStrings(corpus.uid2user.get(1000).?.name, "vidmantas");
//try testing.expectEqualStrings(corpus.uid2user.get(0).?.name, "Name" ** 8);
//try testing.expectEqualStrings(corpus.uid2user.get(1002).?.name, "svc-bar");
}
fn testUser(name: []const u8) User {

56
src/user.zig
View File

@ -21,6 +21,44 @@ pub const User = struct {
gecos: []const u8,
home: []const u8,
shell: []const u8,
// deep-clones a User record with a given Allocator.
pub fn clone(self: *const User, allocator: Allocator) Allocator.Error!User {
const stringdata = try allocator.alloc(u8, self.stringdata_len());
//std.debug.print("\nptr to stringdata: {d}\n", .{@ptrToInt(stringdata.ptr)});
const gecos_start = self.name.len;
const home_start = gecos_start + self.gecos.len;
const shell_start = home_start + self.shell.len;
mem.copy(u8, stringdata[0..self.name.len], self.name);
mem.copy(u8, stringdata[gecos_start..], self.gecos);
mem.copy(u8, stringdata[home_start..], self.home);
mem.copy(u8, stringdata[shell_start..], self.shell);
const u = User{
.uid = self.uid,
.gid = self.gid,
.name = stringdata[0..self.name.len],
.gecos = stringdata[gecos_start .. gecos_start + self.gecos.len],
.home = stringdata[home_start .. home_start + self.home.len],
.shell = stringdata[shell_start .. shell_start + self.shell.len],
};
return u;
}
fn stringdata_len(self: *const User) usize {
return self.name.len +
self.gecos.len +
self.home.len +
self.shell.len;
}
pub fn deinit(self: *const User, allocator: Allocator) void {
//allocator.free(self.stringdata);
//self.* = undefined;
const slice = self.home.ptr[0..self.stringdata_len()];
allocator.free(slice);
}
};
pub const PackedUserMut = packedUser(false);
@ -389,3 +427,21 @@ test "PackedUser.maxSize()" {
try PackedUserConst.packTo(&buf, largeUser, testShellIndex);
try testing.expectEqual(PackedUserConst.maxSize(), buf.items.len);
}
test "User.clone" {
var allocator = testing.allocator;
const user = User{
.uid = 1000,
.gid = 1000,
.name = "vidmantas",
.gecos = "Vidmantas Kaminskas",
.home = "/home/vidmantas",
.shell = "/bin/bash",
};
var user2 = try user.clone(allocator);
user2.shell = "/bin/zsh";
defer user2.deinit(allocator);
try testing.expectEqualStrings(user.shell, "/bin/bash");
}