exchange_test.v

1//! Two-machine tests: two repos and one folder remote standing in for the Mac2//! and the PC. This is where offer, steal and combine are actually proven —3//! the folder backend exists so these run offline.45module exchange67import os8import src.events9import src.history10import src.remote11import src.snapshot12import src.storage1314// Global rules must not make source fixtures depend on the developer’s home.15fn testsuite_begin() {16	os.setenv('HOME', os.join_path(os.temp_dir(), 'koh3-test-home-${os.getpid()}'), true)17}1819fn test_arriving_record_drops_unsafe_paths_and_reports_them() {20	mut record := SaveRecord{21		files: [22			FileRecord{ path: 'safe.txt' },23			FileRecord{ path: '../outside.txt' },24			FileRecord{ path: 'bad\\name.txt' },25			FileRecord{ path: 'Icon\r' },26		]27	}28	dropped := drop_unsafe_paths(mut record)29	assert record.files.map(it.path) == ['safe.txt']30	assert dropped == ['../outside.txt', 'Icon\\x0d', 'bad\\\\name.txt']31}3233// An unpaired surrogate escape stands for its three bytes, so the record still34// decodes and only the path holding it is dropped; a real pair is kept.35fn test_a_record_with_unpaired_surrogate_escapes_drops_only_those_paths() {36	body := '{"id":"abcdefabcdef","files":[{"path":"ok\\ud83d\\ude00"},{"path":"lead\\ud800"},{"path":"trail\\udc00x"},{"path":"back\\\\ud800"}]}'37	mut record := decode_save(body.bytes())!38	dropped := drop_unsafe_paths(mut record)39	assert record.files.map(it.path) == ['ok😀']40	assert dropped == ['back\\\\ud800', 'lead\\xed\\xa0\\x80', 'trail\\xed\\xb0\\x80x']41}4243// Machines keep their repo in a folder of the same NAME, because the remote key44// is the folder's name; that is what makes them the same repo to the remote.45fn machine(name string) !string {46	dir := os.join_path(os.temp_dir(), 'koh3_sync_${os.getpid()}_${name}', 'proj')47	os.rmdir_all(os.dir(dir)) or {}48	os.mkdir_all(dir, os.MkdirParams{})!49	return dir50}5152fn scratch(name string) !string {53	dir := os.join_path(os.temp_dir(), 'koh3_sync_${os.getpid()}_${name}')54	os.rmdir_all(dir) or {}55	os.mkdir_all(dir, os.MkdirParams{})!56	return dir57}5859fn open_repo(dir string) !storage.Store {60	mut store := storage.create(dir)!61	os.write_file(os.join_path(dir, '.kohignore'), '*.log\n')!62	return store63}6465fn put(root string, rel string, text string) ! {66	full := os.join_path(root, rel)67	os.mkdir_all(os.dir(full), os.MkdirParams{})!68	os.write_file(full, text)!69}7071fn make_save(store &storage.Store, message string) !history.Save {72	return history.save_worktree(store, store.root, snapshot.load(store.root), history.SaveInput{73		message: message74	})!75}7677fn offer_now(store &storage.Store, mut backend remote.Backend) !OfferReport {78	return offer(store, mut backend)!79}8081fn steal_now(store &storage.Store, mut backend remote.Backend) !StealReport {82	return steal(store, mut backend, StealOptions{83		theirs: true84	})!85}8687fn test_first_offer_publishes_the_whole_line() {88	base := scratch('first')!89	defer {90		os.rmdir_all(base) or {}91	}92	mut a := open_repo(machine('first_a')!)!93	defer {94		a.close()95	}96	put(a.root, 'a.txt', 'one\n')!97	make_save(a, 'first')!98	put(a.root, 'a.txt', 'two\n')!99	make_save(a, 'second')!100	mut backend := remote.new_folder(os.join_path(base, 'remote'))!101102	report := offer_now(a, mut backend)!103	assert report.repo == 'proj'104	assert report.saves == 2105	assert report.objects >= 2106	assert backend.get(head_key('proj'))!.found107	assert backend.list('proj/saves')!.len == 2108109	// A second offer with nothing new uploads nothing and still succeeds.110	again := offer_now(a, mut backend)!111	assert again.saves == 0112}113114fn test_the_repo_name_is_remembered_and_head_offered() {115	base := scratch('remember')!116	defer {117		os.rmdir_all(base) or {}118	}119	mut a := open_repo(machine('remember_a')!)!120	defer {121		a.close()122	}123	put(a.root, 'a.txt', 'one\n')!124	make_save(a, 'first')!125	mut backend := remote.new_folder(os.join_path(base, 'remote'))!126	offer_now(a, mut backend)!127	assert a.state('remote_repo') or { '' } == 'proj'128	assert backend.get(head_key('proj'))!.body.bytestr() == head_of(a).id129	// Offer's step 3: the new remote head is recorded in state.130	assert a.state('remote_head') or { '' } == head_of(a).id131132	// A second offer, with the remote already holding our head, must not133	// refuse: the name is remembered, so the remote is ours.134	put(a.root, 'a.txt', 'two\n')!135	make_save(a, 'second')!136	offer_now(a, mut backend)!137	assert backend.get(head_key('proj'))!.body.bytestr() == head_of(a).id138}139140fn test_a_repo_name_is_lowercased_at_first_offer() {141	base := scratch('lower')!142	defer {143		os.rmdir_all(base) or {}144	}145	dir := os.join_path(base, 'Haven')146	os.mkdir_all(dir, os.MkdirParams{})!147	mut a := open_repo(dir)!148	defer {149		a.close()150	}151	put(a.root, 'a.txt', 'one\n')!152	make_save(a, 'first')!153	mut backend := remote.new_folder(os.join_path(base, 'remote'))!154	assert offer_now(a, mut backend)!.repo == 'haven'155	assert backend.get(head_key('haven'))!.found156}157158fn test_an_offer_follows_a_rename_kepr_marked_on_the_remote() {159	base := scratch('renamed')!160	defer {161		os.rmdir_all(base) or {}162	}163	mut a := open_repo(machine('renamed_a')!)!164	defer {165		a.close()166	}167	put(a.root, 'a.txt', 'one\n')!168	make_save(a, 'first')!169	remote_dir := os.join_path(base, 'remote')170	mut backend := remote.new_folder(remote_dir)!171	offer_now(a, mut backend)!172	// What Kepr's rename leaves: the history under the new name, a marker, no old name.173	os.mv(os.join_path(remote_dir, 'proj'), os.join_path(remote_dir, 'tool'))!174	os.mkdir_all(os.join_path(remote_dir, '.kepr', 'renamed'), os.MkdirParams{})!175	os.write_file(os.join_path(remote_dir, '.kepr', 'renamed', 'proj'), 'tool\n')!176177	put(a.root, 'a.txt', 'two\n')!178	make_save(a, 'second')!179	assert offer_now(a, mut backend)!.repo == 'tool'180	assert a.state('remote_repo') or { '' } == 'tool'181	assert backend.get(head_key('tool'))!.body.bytestr() == head_of(a).id182	assert !backend.get(head_key('proj'))!.found183}184185fn test_a_rename_marker_naming_a_path_is_not_followed() {186	base := scratch('badmarker')!187	defer {188		os.rmdir_all(base) or {}189	}190	mut a := open_repo(machine('badmarker_a')!)!191	defer {192		a.close()193	}194	put(a.root, 'a.txt', 'one\n')!195	make_save(a, 'first')!196	remote_dir := os.join_path(base, 'remote')197	mut backend := remote.new_folder(remote_dir)!198	offer_now(a, mut backend)!199	os.rmdir_all(os.join_path(remote_dir, 'proj'))!200	os.mkdir_all(os.join_path(remote_dir, '.kepr', 'renamed'), os.MkdirParams{})!201	os.write_file(os.join_path(remote_dir, '.kepr', 'renamed', 'proj'), '../elsewhere\n')!202	assert offer_now(a, mut backend)!.repo == 'proj'203}204205fn test_steal_fast_forwards_a_machine_that_has_nothing_of_its_own() {206	base := scratch('forward')!207	defer {208		os.rmdir_all(base) or {}209	}210	mut backend := remote.new_folder(os.join_path(base, 'remote'))!211	mut a := open_repo(machine('fwd_a')!)!212	defer {213		a.close()214	}215	put(a.root, 'a.txt', 'from A\n')!216	make_save(a, 'A writes')!217	offer_now(a, mut backend)!218219	// B starts empty and takes the whole repo.220	mut b := open_repo(machine('fwd_b')!)!221	defer {222		b.close()223	}224	fetched := fetch_repo(mut backend, 'proj')!225	b.begin()!226	write_fetched(b, fetched)!227	history.set_head(b, fetched.head)!228	b.end()!229	snapshot.restore_files(b, b.root, snapshot.load(b.root), history.files_of(b, fetched.head)!, [])!230	assert os.read_file(os.join_path(b.root, 'a.txt'))! == 'from A\n'231	assert head_of(b).id == fetched.head232}233234// A machine that is only ahead has nothing to combine: stealing must leave its235// saves, and their IDs, exactly where they are.236fn test_steal_while_only_ahead_leaves_the_line_alone() {237	base := scratch('ahead')!238	defer {239		os.rmdir_all(base) or {}240	}241	mut backend := remote.new_folder(os.join_path(base, 'remote'))!242	mut a := open_repo(machine('ahead_a')!)!243	defer {244		a.close()245	}246	put(a.root, 'a.txt', 'one\n')!247	make_save(a, 'offered')!248	offer_now(a, mut backend)!249	put(a.root, 'a.txt', 'two\n')!250	ahead := make_save(a, 'not offered yet')!251	report := steal_now(a, mut backend)!252	assert report.replayed == 0253	assert head_of(a).id == ahead.id254	// Nothing was restored, so nothing is left marked as half-restored.255	assert !snapshot.restore_pending(a)256	assert history.all_saves(a)!.len == 2257	offer_now(a, mut backend)!258	assert backend.get(head_key('proj'))!.body.bytestr() == ahead.id259}260261// A link is invisible to the walk, so a tree holding one is clean; the files262// a steal brings in must still never land in the folder it points at.263fn test_steal_never_writes_through_a_symlinked_folder() {264	base := scratch('steal_link')!265	defer {266		os.rmdir_all(base) or {}267	}268	mut backend := remote.new_folder(os.join_path(base, 'remote'))!269	mut a := open_repo(machine('steal_link_a')!)!270	defer {271		a.close()272	}273	mut b := open_repo(machine('steal_link_b')!)!274	defer {275		b.close()276	}277	put(a.root, 'a.txt', 'one\n')!278	make_save(a, 'first')!279	offer_now(a, mut backend)!280	join(b, mut backend)!281	outside := os.join_path(base, 'outside')282	put(outside, 'a.md', 'precious\n')!283	os.symlink(outside, os.join_path(b.root, 'docs'))!284	put(a.root, 'docs/a.md', 'from A\n')!285	make_save(a, 'A adds docs')!286	offer_now(a, mut backend)!287	head_before := head_of(b).id288	if _ := steal_now(b, mut backend) {289		assert false, 'a steal writing through a symlinked folder must refuse'290	} else {291		assert err.msg().contains('docs')292	}293	assert os.read_file(os.join_path(outside, 'a.md'))! == 'precious\n'294	assert head_of(b).id == head_before295}296297// A steal onto a half-restored tree would replay it as somebody's work.298fn test_steal_refuses_after_a_restore_cut_short() {299	base := scratch('steal_cut')!300	defer {301		os.rmdir_all(base) or {}302	}303	mut backend := remote.new_folder(os.join_path(base, 'remote'))!304	mut a := open_repo(machine('steal_cut_a')!)!305	defer {306		a.close()307	}308	put(a.root, 'a.txt', 'one\n')!309	make_save(a, 'first')!310	offer_now(a, mut backend)!311	a.set_state('restoring', 'yes')!312	if _ := steal_now(a, mut backend) {313		assert false, 'steal must refuse while a restore is unfinished'314	} else {315		assert err.msg().contains('koh revert')316	}317}318319// A replayed save keeps its original time but sits on a newer parent, so a320// steal cannot order saves by time.321fn test_a_steal_imports_parents_before_children() {322	base := scratch('steal_order')!323	defer {324		os.rmdir_all(base) or {}325	}326	mut backend := remote.new_folder(os.join_path(base, 'remote'))!327	mut a := open_repo(machine('order_a')!)!328	defer {329		a.close()330	}331	put(a.root, 'a.txt', 'one\n')!332	parent := make_save(a, 'parent')!333	child := history.save_tree(a, '', history.files_of(a, parent.id)!, history.SaveInput{334		message:    'replayed, older than its parent'335		created_at: parent.created_at - 3600336	})!337	offer_now(a, mut backend)!338	mut b := open_repo(machine('order_b')!)!339	defer {340		b.close()341	}342	join(b, mut backend)!343	assert head_of(b).id == child.id344}345346// A chmod is unsaved work too: a steal would restore the old mode over it.347fn test_steal_refuses_an_unsaved_executable_bit_change() {348	base := scratch('chmod')!349	defer {350		os.rmdir_all(base) or {}351	}352	mut backend := remote.new_folder(os.join_path(base, 'remote'))!353	mut a := open_repo(machine('chmod_a')!)!354	defer {355		a.close()356	}357	put(a.root, 'run.sh', 'echo hi\n')!358	make_save(a, 'script')!359	offer_now(a, mut backend)!360	os.chmod(os.join_path(a.root, 'run.sh'), 0o755)!361	if _ := steal_now(a, mut backend) {362		assert false, 'a chmod-only change should make the tree dirty'363	} else {364		assert err.msg() == dirty_tree365	}366}367368fn test_divergence_without_clashes_keeps_both_machines_work() {369	base := scratch('diverge')!370	defer {371		os.rmdir_all(base) or {}372	}373	mut backend := remote.new_folder(os.join_path(base, 'remote'))!374	mut a := open_repo(machine('div_a')!)!375	defer {376		a.close()377	}378	mut b := open_repo(machine('div_b')!)!379	defer {380		b.close()381	}382	put(a.root, 'shared.txt', 'base\n')!383	make_save(a, 'base')!384	offer_now(a, mut backend)!385386	// B joins, then both machines change a different file.387	join(b, mut backend)!388	put(a.root, 'fromA.txt', 'A\n')!389	make_save(a, 'A adds a file')!390	put(b.root, 'fromB.txt', 'B\n')!391	make_save(b, 'B adds a file')!392	offer_now(a, mut backend)!393394	// B's offer is refused: the remote has moved on.395	if _ := offer_now(b, mut backend) {396		assert false, 'offering on top of unknown remote saves should be refused'397	} else {398		assert err.msg().contains('run koh steal')399	}400401	report := steal_now(b, mut backend)!402	assert !report.forward403	assert report.replayed == 1404	assert report.clashes.len == 0405	// Both files are on B's line now, and on disk.406	assert os.read_file(os.join_path(b.root, 'fromA.txt'))! == 'A\n'407	assert os.read_file(os.join_path(b.root, 'fromB.txt'))! == 'B\n'408	assert os.read_file(os.join_path(b.root, 'shared.txt'))! == 'base\n'409	// B's own save was replayed, not erased.410	mut saw_replay := false411	for save in history.all_saves(b)! {412		if save.replayed_from != '' {413			saw_replay = true414		}415	}416	assert saw_replay417	// And the remote now has B's work too.418	offer_now(b, mut backend)!419	line_head := backend.get(head_key('proj'))!.body.bytestr().trim_space()420	assert line_head == head_of(b).id421}422423// An agent that edits a file and then undoes the edit leaves no net change, so424// the file is not a clash when the other machine changed it. Replaying the425// edit itself must not stop the steal: the remote's version simply stands.426// Likewise a file both machines ended up changing the same way.427fn test_a_local_change_undone_does_not_block_a_combine() {428	base := scratch('undone')!429	defer {430		os.rmdir_all(base) or {}431	}432	mut backend := remote.new_folder(os.join_path(base, 'remote'))!433	mut a := open_repo(machine('undone_a')!)!434	defer {435		a.close()436	}437	mut b := open_repo(machine('undone_b')!)!438	defer {439		b.close()440	}441	put(a.root, 'f.txt', 'base\n')!442	put(a.root, 'g.txt', 'base\n')!443	make_save(a, 'base')!444	offer_now(a, mut backend)!445	join(b, mut backend)!446447	put(a.root, 'f.txt', 'from A\n')!448	put(a.root, 'g.txt', 'same\n')!449	make_save(a, 'A edits both')!450	offer_now(a, mut backend)!451452	put(b.root, 'f.txt', 'tried on B\n')!453	put(b.root, 'g.txt', 'first try\n')!454	tried := make_save(b, 'B tries')!455	put(b.root, 'f.txt', 'base\n')!456	put(b.root, 'g.txt', 'same\n')!457	put(b.root, 'h.txt', 'B\n')!458	undone := make_save(b, 'B undoes f, lands on the same g, adds h')!459460	report := steal_now(b, mut backend)!461	assert report.clashes.len == 0462	assert os.read_file(os.join_path(b.root, 'f.txt'))! == 'from A\n'463	assert os.read_file(os.join_path(b.root, 'g.txt'))! == 'same\n'464	assert os.read_file(os.join_path(b.root, 'h.txt'))! == 'B\n'465	// "B tries" only touched files A changed, so it has nothing left to466	// replay; the second save carries h.txt. Both originals stay in history.467	assert report.replayed == 1468	assert head_of(b).replayed_from == undone.id469	ids := history.all_saves(b)!.map(it.id)470	assert tried.id in ids && undone.id in ids471	assert history.files_of(b, tried.id)!.any(it.path == 'f.txt')472}473474// A person deciding a clash may take minutes; the question must come before475// the write lock, or every agent's save on this repo waits and then fails.476fn test_clash_questions_are_asked_before_the_write_lock() {477	base := scratch('ask_unlocked')!478	defer {479		os.rmdir_all(base) or {}480	}481	mut backend := remote.new_folder(os.join_path(base, 'remote'))!482	mut a := open_repo(machine('ask_a')!)!483	defer {484		a.close()485	}486	mut b := open_repo(machine('ask_b')!)!487	defer {488		b.close()489	}490	put(a.root, 'same.txt', 'base\n')!491	make_save(a, 'base')!492	offer_now(a, mut backend)!493	join(b, mut backend)!494	put(a.root, 'same.txt', 'A version\n')!495	make_save(a, 'A edits same')!496	offer_now(a, mut backend)!497	put(b.root, 'same.txt', 'B version\n')!498	make_save(b, 'B edits same')!499	root := b.root500	// An agent saves while the person is still choosing.501	if _ := steal(b, mut backend, StealOptions{502		guide: fn [root] (preview StealPreview) !map[string]Side {503			other := storage.open(root) or { panic(err) }504			defer {505				other.close()506			}507			os.write_file(os.join_path(root, 'agent.txt'), 'saved meanwhile\n') or { panic(err) }508			history.save_worktree(other, root, snapshot.load(root), history.SaveInput{509				message: 'agent saves during the question'510			}) or { panic('steal held the write lock while asking: ${err}') }511			return {512				preview.clashes[0].path: Side.mine513			}514		}515	})516	{517		assert false, 'a steal whose line moved during the question must refuse'518	} else {519		assert err.msg().contains('changed while')520	}521	// The agent's save is still head, and a second steal combines it too.522	assert head_of(b).message == 'agent saves during the question'523	report := steal(b, mut backend, StealOptions{524		mine: true525	})!526	assert report.kept_mine == 1527	assert os.read_file(os.join_path(b.root, 'agent.txt'))! == 'saved meanwhile\n'528	assert os.read_file(os.join_path(b.root, 'same.txt'))! == 'B version\n'529}530531fn test_clashing_files_are_chosen_one_at_a_time() {532	base := scratch('clash')!533	defer {534		os.rmdir_all(base) or {}535	}536	mut backend := remote.new_folder(os.join_path(base, 'remote'))!537	mut a := open_repo(machine('clash_a')!)!538	defer {539		a.close()540	}541	mut b := open_repo(machine('clash_b')!)!542	defer {543		b.close()544	}545	put(a.root, 'same.txt', 'base\n')!546	put(a.root, 'other.txt', 'quiet\n')!547	make_save(a, 'base')!548	offer_now(a, mut backend)!549	join(b, mut backend)!550551	// Both machines edit the same file, differently.552	put(a.root, 'same.txt', 'A version\n')!553	make_save(a, 'A edits same')!554	offer_now(a, mut backend)!555	put(b.root, 'same.txt', 'B version\n')!556	make_save(b, 'B edits same')!557558	// Without a decision, steal refuses and says which files clash.559	if _ := steal(b, mut backend, StealOptions{}) {560		assert false, 'an undecided clash must be refused'561	} else {562		assert err.msg().contains('--mine') || err.msg().contains('--theirs')563		// `koh offer` has no --mine or --theirs, so it needs the paths, not this sentence.564		if err is ClashError {565			assert err.paths == ['same.txt']566		} else {567			assert false, 'an undecided clash must be a ClashError, not ${err}'568		}569	}570	assert find_clashes(history.files_of(b, head_of(b).id)!, history.files_of(b, head_of(b).id)!, history.files_of(b,571		head_of(b).id)!).len == 0572573	// Choosing the remote's version ends with A's content.574	report := steal_now(b, mut backend)!575	assert report.clashes == ['same.txt']576	assert report.kept_mine == 0577	assert report.kept_versions == ['same.txt:${report.previous_head}']578	assert os.read_file(os.join_path(b.root, 'same.txt'))! == 'A version\n'579	assert os.read_file(os.join_path(b.root, 'other.txt'))! == 'quiet\n'580}581582fn test_cancelling_a_guided_steal_keeps_the_line_and_can_retry() {583	base := scratch('guided_cancel')!584	defer { os.rmdir_all(base) or {} }585	mut backend := remote.new_folder(os.join_path(base, 'remote'))!586	mut a := open_repo(machine('guided_cancel_a')!)!587	defer { a.close() }588	mut b := open_repo(machine('guided_cancel_b')!)!589	defer { b.close() }590	put(a.root, 'same.txt', 'base\n')!591	make_save(a, 'base')!592	offer_now(a, mut backend)!593	join(b, mut backend)!594	put(a.root, 'same.txt', 'remote\n')!595	remote_head := make_save(a, 'remote change')!596	offer_now(a, mut backend)!597	put(b.root, 'same.txt', 'mine\n')!598	local_head := make_save(b, 'local change')!599600	if _ := steal(b, mut backend, StealOptions{601		guide: fn (preview StealPreview) !map[string]Side {602			assert preview.clashes.len == 1603			return error('cancelled')604		}605	}) {606		assert false, 'the guide cancelled'607	} else {608		assert err.msg() == 'cancelled'609	}610	assert head_of(b).id == local_head.id611	assert os.read_file(os.join_path(b.root, 'same.txt'))! == 'mine\n'612	assert history.by_id(b, remote_head.id) != none613	assert steal(b, mut backend, StealOptions{ mine: true })!.kept_mine == 1614}615616fn test_choosing_mine_keeps_the_local_version() {617	base := scratch('mine')!618	defer {619		os.rmdir_all(base) or {}620	}621	mut backend := remote.new_folder(os.join_path(base, 'remote'))!622	mut a := open_repo(machine('mine_a')!)!623	defer {624		a.close()625	}626	mut b := open_repo(machine('mine_b')!)!627	defer {628		b.close()629	}630	put(a.root, 'same.txt', 'base\n')!631	make_save(a, 'base')!632	offer_now(a, mut backend)!633	join(b, mut backend)!634	put(a.root, 'same.txt', 'A version\n')!635	make_save(a, 'A edits')!636	offer_now(a, mut backend)!637	put(b.root, 'same.txt', 'B version\n')!638	make_save(b, 'B edits')!639640	report := steal(b, mut backend, StealOptions{641		mine: true642	})!643	assert report.kept_mine == 1644	assert os.read_file(os.join_path(b.root, 'same.txt'))! == 'B version\n'645	// The final save says what it kept.646	assert head_of(b).message.contains('combine: kept mine for 1 file')647	// The pre-combine tree is still reachable in history.648	assert head_of(b).restores == ''649	assert history.all_saves(b)!.len >= 4650}651652fn test_flags_travel_with_the_saves() {653	base := scratch('flags')!654	defer {655		os.rmdir_all(base) or {}656	}657	mut backend := remote.new_folder(os.join_path(base, 'remote'))!658	mut a := open_repo(machine('flag_a')!)!659	defer {660		a.close()661	}662	mut b := open_repo(machine('flag_b')!)!663	defer {664		b.close()665	}666	put(a.root, 'a.txt', 'one\n')!667	save := make_save(a, 'suspect save')!668	events.flag(a, save.id, 'look at this')!669	offer_now(a, mut backend)!670671	// B has nothing yet, so a fetch brings the save and its flag across.672	fetched := fetch_back_to_known(b, mut backend, 'proj')!673	assert fetched.events_out.len == 1674	assert fetched.events_out[0].kind == events.kind_flag675	b.begin()!676	write_fetched(b, fetched)!677	history.set_head(b, fetched.head)!678	b.end()!679	state := events.flag_state(b, save.id)!680	assert state.flagged681	assert state.reason == 'look at this'682}683684fn test_a_second_offer_racing_head_is_refused_not_forced() {685	base := scratch('race')!686	defer {687		os.rmdir_all(base) or {}688	}689	mut backend := remote.new_folder(os.join_path(base, 'remote'))!690	mut a := open_repo(machine('race_a')!)!691	defer {692		a.close()693	}694	put(a.root, 'a.txt', 'one\n')!695	make_save(a, 'base')!696	offer_now(a, mut backend)!697698	// Someone else replaces head behind our back.699	assert backend.put_if_match(head_key('proj'), 'a-save-we-do-not-have'.bytes(),700		backend.get(head_key('proj'))!.tag)!701702	put(a.root, 'a.txt', 'two\n')!703	make_save(a, 'second')!704	if _ := offer_now(a, mut backend) {705		assert false, 'offering while the remote head moved must be refused'706	} else {707		assert err.msg().contains('run koh steal')708	}709}710711// join makes a brand new machine share the remote's line.712fn join(store &storage.Store, mut backend remote.Backend) ! {713	fetched := fetch_repo(mut backend, 'proj')!714	store.begin()!715	write_fetched(store, fetched)!716	history.set_head(store, fetched.head)!717	store.end()!718	snapshot.restore_files(store, store.root, snapshot.load(store.root), history.files_of(store,719		fetched.head)!, [])!720	store.set_state('remote_repo', 'proj')!721}722723struct FaultyBackend {724mut:725	inner      remote.Backend726	writes     int727	reads      int728	fail_write int // fail when the write counter reaches this, 0 never729	fail_read  int730	// fail every delete while set731	fail_delete bool732	// race_format stands in for another machine writing the format key first:733	// the first `format` write loses, to a value this koh does not speak.734	race_format bool735	raced       bool736}737738fn (mut f FaultyBackend) get(key string) !remote.Object {739	f.reads++740	if f.fail_read > 0 && f.reads >= f.fail_read {741		return error('injected read failure')742	}743	return f.inner.get(key)!744}745746fn (mut f FaultyBackend) list(prefix string) ![]string {747	return f.inner.list(prefix)!748}749750fn (mut f FaultyBackend) put_if_absent(key string, body []u8) !bool {751	f.writes++752	if f.fail_write > 0 && f.writes >= f.fail_write {753		return error('injected write failure')754	}755	if f.race_format && !f.raced && key.ends_with('/format') {756		f.raced = true757		f.inner.put_if_absent(key, 'koh-remote 2'.bytes())!758		return false759	}760	return f.inner.put_if_absent(key, body)!761}762763fn (mut f FaultyBackend) put_if_match(key string, body []u8, tag string) !bool {764	f.writes++765	if f.fail_write > 0 && f.writes >= f.fail_write {766		return error('injected write failure')767	}768	return f.inner.put_if_match(key, body, tag)!769}770771fn (mut f FaultyBackend) delete(key string) ! {772	if f.fail_delete {773		return error('injected delete failure')774	}775	f.inner.delete(key)!776}777778// Every save offers after it is made, so a one-file change must cost one779// object, not one conditional write per file in the repo: on S3 each of those780// is a round trip.781fn test_an_offer_sends_only_the_objects_a_save_adds() {782	base := scratch('offer_diff')!783	defer {784		os.rmdir_all(base) or {}785	}786	mut a := open_repo(machine('offer_diff_a')!)!787	defer {788		a.close()789	}790	for i in 0 .. 20 {791		put(a.root, 'f${i}.txt', 'file ${i}\n')!792	}793	make_save(a, 'twenty files')!794	mut backend := FaultyBackend{795		inner: remote.new_folder(os.join_path(base, 'remote'))!796	}797	offer(a, mut backend)!798	put(a.root, 'f3.txt', 'changed\n')!799	make_save(a, 'one change')!800	before := backend.writes801	report := offer(a, mut backend)!802	assert report.objects == 1803	// One object, one save record, one head swap.804	assert backend.writes - before == 3805}806807fn test_a_failed_offer_is_safe_to_re_run() {808	base := scratch('fault_offer')!809	defer {810		os.rmdir_all(base) or {}811	}812	remote_dir := os.join_path(base, 'remote')813	mut a := open_repo(machine('fault_a')!)!814	defer {815		a.close()816	}817	put(a.root, 'a.txt', 'one\n')!818	make_save(a, 'first')!819	put(a.root, 'a.txt', 'two\n')!820	make_save(a, 'second')!821822	// The first offer dies after the first write.823	mut flaky := FaultyBackend{824		inner:      remote.new_folder(remote_dir)!825		fail_write: 2826	}827	if _ := offer(a, mut flaky) {828		assert false, 'the injected failure should have surfaced'829	}830831	// Re-running with a healthy remote finishes the job: "already exists" is832	// success, so nothing is lost and nothing is duplicated.833	mut healthy := remote.new_folder(remote_dir)!834	report := offer(a, mut healthy)!835	assert report.saves == 2836	assert healthy.get(head_key('proj'))!.body.bytestr().trim_space() == head_of(a).id837	assert healthy.list('proj/saves')!.len == 2838}839840// A strip whose path breaks §5.5 names nothing a save can hold; Koh and Kepr both leave it out,841// and it must neither remove anything nor hold up an offer.842fn test_a_strip_with_an_illegal_path_is_ignored() {843	base := scratch('illegal_strip')!844	defer {845		os.rmdir_all(base) or {}846	}847	mut backend := remote.new_folder(os.join_path(base, 'remote'))!848	mut a := open_repo(machine('illegal_strip_a')!)!849	defer {850		a.close()851	}852	mut b := open_repo(machine('illegal_strip_b')!)!853	defer {854		b.close()855	}856	put(a.root, 'a/x.txt', 'kept\n')!857	make_save(a, 'add a folder')!858	offer_now(a, mut backend)!859	for id, path in {860		'aaaaaaaaaaaa': 'a//'861		'bbbbbbbbbbbb': 'a\\ud800'862	} {863		backend.put_if_absent(event_key('proj', id), '{"id":"${id}","kind":"strip","save_id":"","path":"${path}","reason":"","created_at":1,"machine":"crafted"}'.bytes())!864	}865	join(b, mut backend)!866	assert 'a/x.txt' in history.files_of(b, history.head(b)!.id)!.map(it.path)867	put(a.root, 'more.txt', 'more\n')!868	make_save(a, 'more')!869	offer_now(a, mut backend)!870}871872fn test_a_failed_steal_leaves_nothing_behind() {873	base := scratch('fault_steal')!874	defer {875		os.rmdir_all(base) or {}876	}877	remote_dir := os.join_path(base, 'remote')878	mut a := open_repo(machine('fault_s_a')!)!879	defer {880		a.close()881	}882	mut b := open_repo(machine('fault_s_b')!)!883	defer {884		b.close()885	}886	put(a.root, 'a.txt', 'from A\n')!887	make_save(a, 'A writes')!888	mut healthy := remote.new_folder(remote_dir)!889	offer(a, mut healthy)!890891	// B's fetch fails half way through reading the remote.892	mut flaky := FaultyBackend{893		inner:     remote.new_folder(remote_dir)!894		fail_read: 2895	}896	if _ := fetch_back_to_known(b, mut flaky, 'proj') {897		assert false, 'the injected read failure should have surfaced'898	}899	// Nothing was written: the store is untouched and still has no saves.900	assert history.head(b) == none901	assert b.object_count()! == 0902903	// A healthy retry works.904	fetched := fetch_back_to_known(b, mut healthy, 'proj')!905	b.begin()!906	write_fetched(b, fetched)!907	history.set_head(b, fetched.head)!908	b.end()!909	snapshot.restore_files(b, b.root, snapshot.load(b.root), history.files_of(b, fetched.head)!, [])!910	assert os.read_file(os.join_path(b.root, 'a.txt'))! == 'from A\n'911}912913fn test_an_interrupted_strip_is_idempotent() {914	// The local half of a strip is one transaction, so an interrupted strip is915	// simply a strip that did not happen; re-running it must land the same916	// result once, not twice.917	base := scratch('fault_strip')!918	defer {919		os.rmdir_all(base) or {}920	}921	mut a := open_repo(machine('fault_strip_a')!)!922	defer {923		a.close()924	}925	put(a.root, 'secret.txt', 'shh\n')!926	put(a.root, 'keep.txt', 'fine\n')!927	save := make_save(a, 'add both')!928929	for _ in 0 .. 2 {930		strip_local(a, 'secret.txt', '')!931	}932	files := history.files_of(a, save.id)!933	// The repo's own `.kohignore` is tracked content, so it stays; only the934	// stripped path goes.935	assert files.map(it.path) == ['.kohignore', 'keep.txt']936	assert events.strip_events(a)!.len == 1937}938939// SQLite's LIKE ignores ASCII case, so a strip of `docs` must not reach into940// `Docs/`, and `a_b` must not reach `aXb`: strip destroys, so it matches exactly.941// The tree is built by hand: on macOS `Docs` and `docs` are one folder on disk,942// but a save made on Linux can hold both.943fn test_a_strip_matches_the_path_exactly() {944	mut a := open_repo(machine('strip_exact')!)!945	defer {946		a.close()947	}948	hash := a.put_object('x\n'.bytes())!949	mut files := []snapshot.FileEntry{}950	for path in ['DOCS.txt', 'Docs/keep.txt', 'a_b/x.txt', 'aXb/y.txt', 'docs/secret.txt'] {951		files << snapshot.FileEntry{952			path: path953			hash: hash954		}955	}956	save := history.save_tree(a, '', files, history.SaveInput{957		message: 'add all'958	})!959	assert strip_scope(a, 'docs', '')!.files == 1960	strip_local(a, 'docs', '')!961	strip_local(a, 'a_b', '')!962	assert history.files_of(a, save.id)!.map(it.path) == ['DOCS.txt', 'Docs/keep.txt', 'aXb/y.txt']963}964965fn test_a_strip_reaches_the_remote_and_other_machines() {966	base := scratch('strip_sync')!967	defer {968		os.rmdir_all(base) or {}969	}970	mut a := open_repo(machine('strip_a')!)!971	defer {972		a.close()973	}974	mut b := open_repo(machine('strip_b')!)!975	defer {976		b.close()977	}978	put(a.root, 'secrets.env', 'api_key=1\n')!979	put(a.root, 'keep.txt', 'fine\n')!980	save := make_save(a, 'add both')!981	mut backend := remote.new_folder(os.join_path(base, 'remote'))!982	offer_now(a, mut backend)!983	join(b, mut backend)!984	assert b.object_count()! > 0985986	// A strips the path locally, the way `koh strip` does, then tells the987	// remote.988	mut secret_hash := ''989	for file in history.files_of(a, save.id)! {990		if file.path == 'secrets.env' {991			secret_hash = file.hash992		}993	}994	assert secret_hash != ''995	strip_local(a, 'secrets.env', '')!996	report := send_strip(a, mut backend, 'secrets.env')!997	assert report.event_sent998	assert report.records == 19991000	// The remote's copy of the save no longer lists the file, and the object is1001	// gone from the remote.1002	record := decode_save(backend.get(save_key('proj', save.id))!.body)!1003	for file in record.files {1004		assert file.path != 'secrets.env'1005	}1006	// The stripped object is gone from the remote; the ones still referenced1007	// are not.1008	assert !backend.get(object_key('proj', secret_hash))!.found1009	assert backend.list('proj/objects')!.len == 210101011	// Another machine hears about it on its next steal and applies it.1012	b.begin()!1013	fetched := fetch_back_to_known(b, mut backend, 'proj')!1014	write_fetched(b, fetched)!1015	b.end()!1016	mut paths := []string{}1017	for file in history.files_of(b, save.id)! {1018		paths << file.path1019	}1020	assert 'secrets.env' !in paths1021	assert 'keep.txt' in paths10221023	// The event arrives under its own ID, so it is applied once: B's offer adds1024	// no second copy. The path is banned for good: written again, the file is1025	// neither unsaved work nor ever walked into a save.1026	assert events.strip_events(b)!.map(it.id) == events.strip_events(a)!.map(it.id)1027	put(b.root, 'secrets.env', 'rotated\n')!1028	assert !dirty(b, history.head(b))!1029	put(b.root, 'keep.txt', 'still fine\n')!1030	later := make_save(b, 'edit keep')!1031	offer_now(b, mut backend)!1032	assert backend.list('proj/events')!.len == 11033	assert 'secrets.env' !in history.files_of(b, later.id)!.map(it.path)1034}10351036// A strip removes a path from all of history, whenever a save was made. A1037// machine that saved the file after the strip, before it heard of it, loses1038// it from that save too on its next steal, so no copy anywhere keeps it.1039fn test_a_strip_reaches_saves_made_after_it_by_a_machine_that_had_not_heard() {1040	base := scratch('strip_later')!1041	defer {1042		os.rmdir_all(base) or {}1043	}1044	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1045	mut a := open_repo(machine('strip_later_a')!)!1046	defer {1047		a.close()1048	}1049	mut b := open_repo(machine('strip_later_b')!)!1050	defer {1051		b.close()1052	}1053	put(a.root, 'secrets.env', 'api_key=1\n')!1054	old := make_save(a, 'leak the key')!1055	offer_now(a, mut backend)!1056	join(b, mut backend)!1057	strip_local(a, 'secrets.env', '')!1058	send_strip(a, mut backend, 'secrets.env')!1059	// B has not heard, and saves the file again an hour after the strip.1060	put(b.root, 'secrets.env', 'api_key=2\n')!1061	later := history.save_tree(b, b.root, snapshot.walk(b, b.root, snapshot.load(b.root))!, history.SaveInput{1062		message:    'rotate the key'1063		created_at: events.strip_events(a)!.last().created_at + 36001064	})!1065	assert 'secrets.env' in history.files_of(b, later.id)!.map(it.path)1066	b.begin()!1067	write_fetched(b, fetch_back_to_known(b, mut backend, 'proj')!)!1068	b.end()!1069	assert 'secrets.env' !in history.files_of(b, later.id)!.map(it.path)1070	offer_now(b, mut backend)!10711072	mut c := open_repo(machine('strip_later_c')!)!1073	defer {1074		c.close()1075	}1076	join(c, mut backend)!1077	for save in [old.id, later.id] {1078		assert 'secrets.env' !in history.files_of(c, save)!.map(it.path)1079	}1080	assert !os.exists(os.join_path(c.root, 'secrets.env'))1081}10821083// A strip this machine already holds bans its path from saves that arrive1084// later too, not only from those a fetch brings with the strip.1085fn test_a_held_strip_reaches_saves_arriving_after_it() {1086	base := scratch('strip_held')!1087	defer {1088		os.rmdir_all(base) or {}1089	}1090	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1091	mut a := open_repo(machine('strip_held_a')!)!1092	defer {1093		a.close()1094	}1095	mut b := open_repo(machine('strip_held_b')!)!1096	defer {1097		b.close()1098	}1099	put(a.root, 'secrets.env', 'api_key=1\n')!1100	make_save(a, 'leak the key')!1101	offer_now(a, mut backend)!1102	join(b, mut backend)!1103	strip_local(b, 'secrets.env', '')!1104	put(a.root, 'keep.txt', 'fine\n')!1105	later := make_save(a, 'add keep')!1106	offer_now(a, mut backend)!1107	b.begin()!1108	write_fetched(b, fetch_back_to_known(b, mut backend, 'proj')!)!1109	b.end()!1110	paths := history.files_of(b, later.id)!.map(it.path)1111	assert 'secrets.env' !in paths1112	assert 'keep.txt' in paths1113}11141115// StripRace stands in for another machine that strips `path` completely, event1116// and rewrite, just before this machine's first save record lands.1117struct StripRace {1118mut:1119	inner remote.Backend1120	other &storage.Store1121	path  string1122	done  bool1123	// fail every put after the one the strip raced1124	fail_after_race bool1125	raced_put       bool1126	fail_delete     bool1127	fail_match      bool1128	// race at the first object instead of the first save record1129	on_objects bool1130}11311132fn (mut r StripRace) get(key string) !remote.Object {1133	return r.inner.get(key)!1134}11351136fn (mut r StripRace) list(prefix string) ![]string {1137	return r.inner.list(prefix)!1138}11391140fn (mut r StripRace) put_if_absent(key string, body []u8) !bool {1141	if r.fail_after_race && r.raced_put {1142		return error('injected write failure')1143	}1144	if !r.done && key.contains(if r.on_objects { '/objects/' } else { '/saves/' }) {1145		r.done = true1146		r.raced_put = true1147		strip_local(r.other, r.path, '')!1148		send_strip(r.other, mut r.inner, r.path)!1149	}1150	return r.inner.put_if_absent(key, body)!1151}11521153fn (mut r StripRace) put_if_match(key string, body []u8, tag string) !bool {1154	if r.fail_match {1155		return error('injected rewrite failure')1156	}1157	return r.inner.put_if_match(key, body, tag)!1158}11591160fn (mut r StripRace) delete(key string) ! {1161	if r.fail_delete {1162		return error('injected delete failure')1163	}1164	r.inner.delete(key)!1165}11661167// A strip that finishes on another machine while an offer uploads has already1168// rewritten the remote without the offer's records, so the offer takes back1169// what the strip reaches and leaves head where it was.1170fn test_an_offer_racing_a_strip_leaves_no_stripped_path_behind() {1171	base := scratch('strip_race')!1172	defer {1173		os.rmdir_all(base) or {}1174	}1175	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1176	mut a := open_repo(machine('strip_race_a')!)!1177	defer {1178		a.close()1179	}1180	mut b := open_repo(machine('strip_race_b')!)!1181	defer {1182		b.close()1183	}1184	put(a.root, 'secrets.env', 'api_key=1\n')!1185	first := make_save(a, 'leak the key')!1186	offer_now(a, mut backend)!1187	join(b, mut backend)!1188	put(a.root, 'secrets.env', 'api_key=2\n')!1189	later := make_save(a, 'rotate the key')!1190	secret := history.files_of(a, later.id)!.filter(it.path == 'secrets.env')[0].hash1191	mut race := StripRace{1192		inner: backend1193		other: &b1194		path:  'secrets.env'1195	}1196	if _ := offer(a, mut race) {1197		assert false, 'an offer that raced a strip must refuse'1198	} else {1199		assert err.msg().contains('koh steal'), err.msg()1200	}1201	assert backend.get(head_key('proj'))!.body.bytestr() == first.id1202	assert !backend.get(object_key('proj', secret))!.found1203	// Another offer may already have published it, so the record stays, stripped.1204	assert backend.get(save_key('proj', later.id))!.found1205	for key in backend.list('proj/saves')! {1206		record := decode_save(backend.get(key)!.body)!1207		assert 'secrets.env' !in record.files.map(it.path), record.id1208	}1209}12101211// Doctor's resend of a missing record can race a strip just as an offer can,1212// and takes back what the strip reaches in the same way.1213fn test_a_resend_racing_a_strip_leaves_no_stripped_path_behind() {1214	base := scratch('resend_race')!1215	defer {1216		os.rmdir_all(base) or {}1217	}1218	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1219	mut a := open_repo(machine('resend_race_a')!)!1220	defer {1221		a.close()1222	}1223	mut b := open_repo(machine('resend_race_b')!)!1224	defer {1225		b.close()1226	}1227	put(a.root, 'secrets.env', 'api_key=1\n')!1228	first := make_save(a, 'leak the key')!1229	offer_now(a, mut backend)!1230	join(b, mut backend)!1231	backend.delete(save_key('proj', first.id))!1232	mut race := StripRace{1233		inner: backend1234		other: &b1235		path:  'secrets.env'1236	}1237	if _ := resend(a, mut race, 'proj', [], [first.id]) {1238		assert false, 'a resend that raced a strip must refuse'1239	} else {1240		assert err.msg().contains('koh steal'), err.msg()1241		// The restored record is still a repair Doctor made.1242		assert (err as Partway).done == 'uploaded 0 objects and 1 save record'1243	}1244	// Head names the restored record, so it stays, less the stripped path.1245	record := decode_save(backend.get(save_key('proj', first.id))!.body)!1246	assert 'secrets.env' !in record.files.map(it.path)1247	assert !backend.get(object_key('proj', storage.hash_hex('api_key=1\n'.bytes())))!.found1248}12491250// An object a strip reaches stays while a remote record still lists it under1251// another path, and a strip that landed before an upload failed is still applied.1252fn test_a_resend_keeps_shared_bytes_and_settles_a_strip_after_a_failure() {1253	base := scratch('resend_shared')!1254	defer {1255		os.rmdir_all(base) or {}1256	}1257	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1258	mut a := open_repo(machine('resend_shared_a')!)!1259	defer {1260		a.close()1261	}1262	mut b := open_repo(machine('resend_shared_b')!)!1263	defer {1264		b.close()1265	}1266	put(a.root, 'secrets.env', 'same\n')!1267	put(a.root, 'copy.txt', 'same\n')!1268	first := make_save(a, 'two paths, one object')!1269	offer_now(a, mut backend)!1270	join(b, mut backend)!1271	put(a.root, 'later.txt', 'later\n')!1272	second := make_save(a, 'not offered')!1273	shared := object_key('proj', storage.hash_hex('same\n'.bytes()))1274	backend.delete(save_key('proj', first.id))!1275	backend.delete(shared)!1276	mut race := StripRace{1277		inner:           backend1278		other:           &b1279		path:            'secrets.env'1280		fail_after_race: true1281	}1282	if _ := resend(a, mut race, 'proj', [], [first.id, second.id]) {1283		assert false, 'the injected failure should have surfaced'1284	} else {1285		assert err.msg().contains('injected'), err.msg()1286	}1287	record := decode_save(backend.get(save_key('proj', first.id))!.body)!1288	paths := record.files.map(it.path)1289	assert 'secrets.env' !in paths && 'copy.txt' in paths, paths.str()1290	assert backend.get(shared)!.found1291}12921293// A note that does not parse, or that no recorded strip of its path backs, is1294// kept and changes nothing remote: sending it would lose the retry or strip1295// where no strip asked.1296fn test_an_untrusted_strip_note_is_kept_and_sends_nothing() {1297	base := scratch('strip_note')!1298	defer {1299		os.rmdir_all(base) or {}1300	}1301	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1302	mut a := open_repo(machine('strip_note_a')!)!1303	defer {1304		a.close()1305	}1306	put(a.root, 'app', 'app\n')!1307	save := make_save(a, 'app')!1308	offer_now(a, mut backend)!1309	events.strip(a, '', 'other')!1310	for note in ['not JSON', '{"saves":[""],"hashes":[]}'] {1311		a.set_state(pending_key('app'), note)!1312		if _ := send_strip(a, mut backend, 'app') {1313			assert false, 'an untrusted note must be refused'1314		} else {1315			assert err.msg().contains('kept for recovery'), err.msg()1316		}1317		assert a.state(pending_key('app')) or { '' } == note1318		assert backend.list(events_prefix('proj'))!.len == 01319		assert 'app' in decode_save(backend.get(save_key('proj', save.id))!.body)!.files.map(it.path)1320	}1321	// Even behind a recorded strip, a note's hashes may name only objects.1322	events.strip(a, '', 'app')!1323	victim := os.join_path(base, 'remote', 'victim', 'head')1324	os.mkdir_all(os.dir(victim))!1325	os.write_file(victim, 'another repo')!1326	a.set_state(pending_key('app'), '{"saves":[""],"hashes":["../../victim/head"]}')!1327	if _ := send_strip(a, mut backend, 'app') {1328		assert false, 'a note naming a path outside the objects must be refused'1329	}1330	assert os.read_file(victim)! == 'another repo'1331	// Nor may a remote record's path-shaped hash be noted or deleted.1332	a.remove_state(pending_key('app'))!1333	requeue_strip(a, 'app')!1334	backend.delete(save_key('proj', save.id))!1335	backend.put_if_absent(save_key('proj', save.id), encode_save(SaveRecord{1336		id:    save.id1337		files: [FileRecord{1338			path: 'app'1339			hash: '../../victim/head'1340		}]1341	}).bytes())!1342	send_strip(a, mut backend, 'app')!1343	assert os.read_file(victim)! == 'another repo'1344}13451346// A settlement that stops at a record leaves it naming an object the strip1347// deleted. A machine behind must still steal past it, and the note written1348// first finishes the strip once this repo has it.1349fn test_a_settlement_stopped_at_a_record_keeps_history_readable() {1350	base := scratch('settle_record')!1351	defer {1352		os.rmdir_all(base) or {}1353	}1354	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1355	mut a := open_repo(machine('settle_record_a')!)!1356	defer {1357		a.close()1358	}1359	mut b := open_repo(machine('settle_record_b')!)!1360	defer {1361		b.close()1362	}1363	mut c := open_repo(machine('settle_record_c')!)!1364	defer {1365		c.close()1366	}1367	put(a.root, 'readme.txt', 'hello\n')!1368	make_save(a, 'start')!1369	offer_now(a, mut backend)!1370	join(c, mut backend)!1371	put(a.root, 'secrets.env', 'api_key=1\n')!1372	leak := make_save(a, 'leak the key')!1373	offer_now(a, mut backend)!1374	join(b, mut backend)!1375	secret := object_key('proj', storage.hash_hex('api_key=1\n'.bytes()))1376	backend.delete(save_key('proj', leak.id))!1377	backend.delete(secret)!1378	mut race := StripRace{1379		inner:      backend1380		other:      &b1381		path:       'secrets.env'1382		fail_match: true1383	}1384	if _ := resend(a, mut race, 'proj', [], [leak.id]) {1385		assert false, 'the injected rewrite failure should have surfaced'1386	}1387	assert 'secrets.env' in decode_save(backend.get(save_key('proj', leak.id))!.body)!.files.map(it.path)1388	steal_now(c, mut backend)!1389	assert history.head(c) or { history.Save{} }.id == leak.id1390	assert strip_pending(a, 'secrets.env')1391	steal_now(a, mut backend)!1392	send_strip(a, mut backend, 'secrets.env')!1393	cleaned := decode_save(backend.get(save_key('proj', leak.id))!.body)!1394	assert 'secrets.env' !in cleaned.files.map(it.path)1395	assert !backend.get(secret)!.found1396}13971398// With no record to leave behind, the note alone carries a resent object that1399// a strip removed meanwhile, until a send after steal deletes it.1400fn test_an_object_only_resend_leaves_a_note_that_finishes_after_steal() {1401	base := scratch('settle_object')!1402	defer {1403		os.rmdir_all(base) or {}1404	}1405	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1406	mut a := open_repo(machine('settle_object_a')!)!1407	defer {1408		a.close()1409	}1410	mut b := open_repo(machine('settle_object_b')!)!1411	defer {1412		b.close()1413	}1414	put(a.root, 'secrets.env', 'api_key=1\n')!1415	make_save(a, 'leak the key')!1416	offer_now(a, mut backend)!1417	join(b, mut backend)!1418	hash := storage.hash_hex('api_key=1\n'.bytes())1419	backend.delete(object_key('proj', hash))!1420	mut race := StripRace{1421		inner:       backend1422		other:       &b1423		path:        'secrets.env'1424		fail_delete: true1425		on_objects:  true1426	}1427	if _ := resend(a, mut race, 'proj', [hash], []) {1428		assert false, 'the injected delete failure should have surfaced'1429	}1430	assert backend.get(object_key('proj', hash))!.found1431	assert strip_pending(a, 'secrets.env')1432	steal_now(a, mut backend)!1433	send_strip(a, mut backend, 'secrets.env')!1434	assert !backend.get(object_key('proj', hash))!.found1435	assert !strip_pending(a, 'secrets.env')1436}14371438// A strip whose deletes fail after its rewrite keeps, in its note, the objects1439// the rewritten record no longer names, so the retry still deletes them.1440fn test_a_strip_retry_deletes_objects_its_rewrite_found() {1441	base := scratch('strip_found')!1442	defer {1443		os.rmdir_all(base) or {}1444	}1445	remote_dir := os.join_path(base, 'remote')1446	mut backend := remote.new_folder(remote_dir)!1447	mut a := open_repo(machine('strip_found_a')!)!1448	defer {1449		a.close()1450	}1451	put(a.root, 'secrets.env', 'api_key=1\n')!1452	make_save(a, 'leak the key')!1453	offer_now(a, mut backend)!1454	strip_local(a, 'secrets.env', '')!1455	// A note rebuilt from the event alone, as Doctor's residue repair writes it.1456	a.remove_state(pending_key('secrets.env'))!1457	requeue_strip(a, 'secrets.env')!1458	mut flaky := FaultyBackend{1459		inner:       remote.new_folder(remote_dir)!1460		fail_delete: true1461	}1462	if _ := send_strip(a, mut flaky, 'secrets.env') {1463		assert false, 'the injected delete failure should have surfaced'1464	}1465	send_strip(a, mut backend, 'secrets.env')!1466	assert !backend.get(object_key('proj', storage.hash_hex('api_key=1\n'.bytes())))!.found1467	assert !strip_pending(a, 'secrets.env')1468}14691470// MovingRecord stands in for another machine rewriting a record between this1471// machine's read and its conditional write: the first conditional write finds1472// `other` already removed from the record.1473struct MovingRecord {1474mut:1475	inner remote.Backend1476	other string1477	moved bool1478}14791480fn (mut m MovingRecord) get(key string) !remote.Object {1481	return m.inner.get(key)!1482}14831484fn (mut m MovingRecord) list(prefix string) ![]string {1485	return m.inner.list(prefix)!1486}14871488fn (mut m MovingRecord) put_if_absent(key string, body []u8) !bool {1489	return m.inner.put_if_absent(key, body)!1490}14911492fn (mut m MovingRecord) put_if_match(key string, body []u8, tag string) !bool {1493	if !m.moved {1494		m.moved = true1495		current := m.inner.get(key)!1496		record := decode_save(current.body)!1497		other := record.files.filter(it.path != m.other)1498		m.inner.put_if_match(key, encode_save(rewrite(record, other)).bytes(), current.tag)!1499	}1500	return m.inner.put_if_match(key, body, tag)!1501}15021503fn (mut m MovingRecord) delete(key string) ! {1504	m.inner.delete(key)!1505}15061507fn test_a_stripped_record_that_moves_is_read_again() {1508	base := scratch('moving_record')!1509	defer {1510		os.rmdir_all(base) or {}1511	}1512	mut folder := remote.new_folder(os.join_path(base, 'remote'))!1513	key := save_key('proj', 'aaaaaaaaaaaa')1514	folder.put_if_absent(key, encode_save(SaveRecord{1515		id:    'aaaaaaaaaaaa'1516		files: [FileRecord{1517			path: 'secret-a'1518		}, FileRecord{1519			path: 'secret-b'1520		}, FileRecord{1521			path: 'keep'1522		}]1523	}).bytes())!1524	mut moving := MovingRecord{1525		inner: folder1526		other: 'secret-b'1527	}1528	strip_record(mut moving, key, 'aaaaaaaaaaaa', [1529		events.Event{1530			kind: events.kind_strip1531			path: 'secret-a'1532		},1533	])!1534	assert decode_save(folder.get(key)!.body)!.files.map(it.path) == ['keep']1535}15361537// An invalid strip event on the remote cannot make an upload take anything back.1538fn test_an_invalid_remote_strip_event_is_not_unapplied() {1539	base := scratch('invalid_remote_strip')!1540	defer {1541		os.rmdir_all(base) or {}1542	}1543	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1544	mut a := open_repo(machine('invalid_remote_strip_a')!)!1545	defer {1546		a.close()1547	}1548	bad := events.Event{1549		id:         'badstripevnt'1550		kind:       events.kind_strip1551		path:       'app'1552		created_at: -11553		machine:    'other'1554	}1555	backend.put_if_absent(event_key('proj', bad.id), encode_event(bad).bytes())!1556	assert unapplied_strips(a, mut backend, 'proj')!.len == 01557}15581559// A resend that fails part way reports what it had already uploaded.1560fn test_a_failed_resend_reports_what_landed() {1561	base := scratch('resend_partway')!1562	defer {1563		os.rmdir_all(base) or {}1564	}1565	remote_dir := os.join_path(base, 'remote')1566	mut a := open_repo(machine('resend_partway_a')!)!1567	defer {1568		a.close()1569	}1570	put(a.root, 'one.txt', 'one\n')!1571	put(a.root, 'two.txt', 'two\n')!1572	make_save(a, 'two objects')!1573	hashes := ['one\n', 'two\n'].map(storage.hash_hex(it.bytes()))1574	mut flaky := FaultyBackend{1575		inner:      remote.new_folder(remote_dir)!1576		fail_write: 21577	}1578	if _ := resend(a, mut flaky, 'proj', hashes, []) {1579		assert false, 'the injected failure should have surfaced'1580	} else {1581		assert err is Partway1582		assert (err as Partway).done == 'uploaded 1 object and 0 save records', (err as Partway).done1583	}1584}15851586// The local half lands before the remote hears anything, so a remote failure1587// leaves nothing to find locally; the pending note is what lets a re-run1588// finish. Objects a remote-only save still needs must survive the strip.1589fn test_an_interrupted_remote_strip_finishes_when_re_run() {1590	base := scratch('strip_resume')!1591	defer {1592		os.rmdir_all(base) or {}1593	}1594	remote_dir := os.join_path(base, 'remote')1595	mut backend := remote.new_folder(remote_dir)!1596	mut a := open_repo(machine('resume_a')!)!1597	defer {1598		a.close()1599	}1600	mut b := open_repo(machine('resume_b')!)!1601	defer {1602		b.close()1603	}1604	put(a.root, 'secrets.env', 'api_key=1\n')!1605	put(a.root, 'shared.env', 'same bytes on B\n')!1606	save := make_save(a, 'add secrets')!1607	offer_now(a, mut backend)!1608	join(b, mut backend)!1609	put(b.root, 'copy.txt', 'same bytes on B\n')!1610	b_save := make_save(b, 'B keeps a copy')!1611	offer_now(b, mut backend)!1612	shared_hash := storage.hash_hex('same bytes on B\n'.bytes())1613	secret_hash := storage.hash_hex('api_key=1\n'.bytes())16141615	strip_local(a, 'secrets.env', '')!1616	// Write 1 uploads the event and write 2 rewrites the first record; B's save,1617	// made from A's tree, lists the file too, and its rewrite (write 3) fails.1618	mut flaky := FaultyBackend{1619		inner:      remote.new_folder(remote_dir)!1620		fail_write: 31621	}1622	if _ := send_strip(a, mut flaky, 'secrets.env') {1623		assert false, 'the injected failure should have surfaced'1624	}1625	assert strip_pending(a, 'secrets.env')1626	assert strip_local(a, 'secrets.env', '')!.files_removed == 01627	report := send_strip(a, mut backend, 'secrets.env')!1628	assert report.records == 11629	assert !strip_pending(a, 'secrets.env')1630	assert !backend.get(object_key('proj', secret_hash))!.found1631	record := decode_save(backend.get(save_key('proj', save.id))!.body)!1632	assert 'secrets.env' !in record.files.map(it.path)1633	b_record := decode_save(backend.get(save_key('proj', b_save.id))!.body)!1634	assert 'secrets.env' !in b_record.files.map(it.path)16351636	// B's save still names the shared bytes, so stripping A's copy keeps them.1637	strip_local(a, 'shared.env', '')!1638	send_strip(a, mut backend, 'shared.env')!1639	assert backend.get(object_key('proj', shared_hash))!.found1640}16411642// A machine that has not heard of a strip must not offer: its records still1643// list the stripped path, and nothing would rewrite them on the remote again.1644fn test_offer_waits_for_an_unapplied_strip() {1645	base := scratch('strip_first')!1646	defer {1647		os.rmdir_all(base) or {}1648	}1649	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1650	mut a := open_repo(machine('strip_first_a')!)!1651	defer {1652		a.close()1653	}1654	mut b := open_repo(machine('strip_first_b')!)!1655	defer {1656		b.close()1657	}1658	put(a.root, 'secrets.env', 'api_key=1\n')!1659	make_save(a, 'add secrets')!1660	offer_now(a, mut backend)!1661	join(b, mut backend)!1662	strip_local(a, 'secrets.env', '')!1663	send_strip(a, mut backend, 'secrets.env')!1664	put(b.root, 'more.txt', 'B keeps working\n')!1665	later := make_save(b, 'B saves with the secret still in its tree')!1666	if _ := offer_now(b, mut backend) {1667		assert false, 'B offered records that still list the stripped path'1668	}1669	steal_now(b, mut backend)!1670	offer_now(b, mut backend)!1671	record := decode_save(backend.get(save_key('proj', later.id))!.body)!1672	assert 'secrets.env' !in record.files.map(it.path)1673}16741675// A strip whose object deletions failed must still delete them when it is run1676// again, and meanwhile the banned path cannot come back in through a save.1677fn test_a_strip_whose_deletes_failed_finishes_when_run_again() {1678	base := scratch('strip_twice')!1679	defer {1680		os.rmdir_all(base) or {}1681	}1682	remote_dir := os.join_path(base, 'remote')1683	mut backend := remote.new_folder(remote_dir)!1684	mut a := open_repo(machine('strip_twice_a')!)!1685	defer {1686		a.close()1687	}1688	put(a.root, 'secrets.env', 'first key\n')!1689	make_save(a, 'first key')!1690	offer_now(a, mut backend)!1691	strip_local(a, 'secrets.env', '')!1692	mut flaky := FaultyBackend{1693		inner:       remote.new_folder(remote_dir)!1694		fail_delete: true1695	}1696	if _ := send_strip(a, mut flaky, 'secrets.env') {1697		assert false, 'the injected delete failure should have surfaced'1698	}1699	put(a.root, 'secrets.env', 'second key\n')!1700	put(a.root, 'other.txt', 'more work\n')!1701	make_save(a, 'more work')!1702	offer_now(a, mut backend)!1703	send_strip(a, mut backend, 'secrets.env')!1704	for key in ['first key\n', 'second key\n'] {1705		assert !backend.get(object_key('proj', storage.hash_hex(key.bytes())))!.found1706	}1707}17081709// Unfinished strips of one path in different scopes finish together.1710fn test_unfinished_strips_of_one_path_in_different_saves_finish_together() {1711	base := scratch('strip_scopes')!1712	defer {1713		os.rmdir_all(base) or {}1714	}1715	remote_dir := os.join_path(base, 'remote')1716	mut backend := remote.new_folder(remote_dir)!1717	mut a := open_repo(machine('strip_scopes_a')!)!1718	defer {1719		a.close()1720	}1721	put(a.root, 'secrets.env', 'first key\n')!1722	first := make_save(a, 'first key')!1723	put(a.root, 'secrets.env', 'second key\n')!1724	second := make_save(a, 'second key')!1725	offer_now(a, mut backend)!1726	strip_local(a, 'secrets.env', first.id)!1727	// Write 1 uploads the event; write 2, the record rewrite, fails.1728	mut flaky := FaultyBackend{1729		inner:      remote.new_folder(remote_dir)!1730		fail_write: 21731	}1732	if _ := send_strip(a, mut flaky, 'secrets.env') {1733		assert false, 'the injected failure should have surfaced'1734	}1735	strip_local(a, 'secrets.env', second.id)!1736	send_strip(a, mut backend, 'secrets.env')!1737	assert !strip_pending(a, 'secrets.env')1738	for save in [first, second] {1739		record := decode_save(backend.get(save_key('proj', save.id))!.body)!1740		assert 'secrets.env' !in record.files.map(it.path)1741	}1742	for key in ['first key\n', 'second key\n'] {1743		assert !backend.get(object_key('proj', storage.hash_hex(key.bytes())))!.found1744	}1745}17461747// A strip bans its path on every machine that has heard of it: written again,1748// the file makes no save, here or there, so there is never a second copy to strip.1749fn test_a_stripped_path_cannot_be_saved_again_on_any_machine() {1750	base := scratch('strip_again')!1751	defer {1752		os.rmdir_all(base) or {}1753	}1754	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1755	mut a := open_repo(machine('strip_again_a')!)!1756	defer {1757		a.close()1758	}1759	mut b := open_repo(machine('strip_again_b')!)!1760	defer {1761		b.close()1762	}1763	put(a.root, 'secrets.env', 'first key\n')!1764	make_save(a, 'first key')!1765	offer_now(a, mut backend)!1766	join(b, mut backend)!1767	strip_local(a, 'secrets.env', '')!1768	send_strip(a, mut backend, 'secrets.env')!1769	steal_now(b, mut backend)!1770	for repo in [a, b] {1771		put(repo.root, 'secrets.env', 'second key\n')!1772		if _ := make_save(repo, 'second key') {1773			assert false, 'a banned path must not make a save'1774		}1775	}1776}17771778// A clash on a path the other machine stripped is no clash: the strip removes1779// the path from every save, so there is nothing to choose.1780fn test_a_stripped_path_is_not_asked_about() {1781	base := scratch('clash_strip')!1782	defer {1783		os.rmdir_all(base) or {}1784	}1785	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1786	mut a := open_repo(machine('clash_strip_a')!)!1787	defer {1788		a.close()1789	}1790	mut b := open_repo(machine('clash_strip_b')!)!1791	defer {1792		b.close()1793	}1794	put(a.root, 'secrets.env', 'key one\n')!1795	make_save(a, 'base')!1796	offer_now(a, mut backend)!1797	join(b, mut backend)!1798	put(a.root, 'secrets.env', 'key two\n')!1799	make_save(a, 'A rotates')!1800	offer_now(a, mut backend)!1801	strip_local(a, 'secrets.env', '')!1802	send_strip(a, mut backend, 'secrets.env')!1803	put(b.root, 'secrets.env', 'key three\n')!1804	mine := make_save(b, 'B rotates')!1805	report := steal(b, mut backend, StealOptions{})!1806	assert report.clashes.len == 01807	for save in history.all_saves(b)! {1808		assert 'secrets.env' !in history.files_of(b, save.id)!.map(it.path)1809	}1810	assert history.by_id(b, mine.id) != none1811}18121813// A strip scoped to the shared base save changes what the replay sees; the1814// clashes must be found on the same trees, or the replay meets a conflict.1815fn test_a_strip_of_the_shared_base_is_seen_before_asking() {1816	base := scratch('clash_base_strip')!1817	defer {1818		os.rmdir_all(base) or {}1819	}1820	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1821	mut a := open_repo(machine('base_strip_a')!)!1822	defer {1823		a.close()1824	}1825	mut b := open_repo(machine('base_strip_b')!)!1826	defer {1827		b.close()1828	}1829	put(a.root, 'notes.txt', 'shared\n')!1830	common := make_save(a, 'base')!1831	offer_now(a, mut backend)!1832	join(b, mut backend)!1833	put(a.root, 'other.txt', 'A moves on\n')!1834	make_save(a, 'A moves on')!1835	offer_now(a, mut backend)!1836	strip_local(a, 'notes.txt', common.id)!1837	send_strip(a, mut backend, 'notes.txt')!1838	put(b.root, 'notes.txt', 'B edits\n')!1839	make_save(b, 'B edits notes')!1840	if _ := steal(b, mut backend, StealOptions{}) {1841		assert false, 'with the base stripped, notes.txt differs on both sides'1842	} else {1843		assert err.msg().contains('notes.txt changed on both machines')1844	}1845	report := steal(b, mut backend, StealOptions{1846		mine: true1847	})!1848	assert report.clashes == ['notes.txt']1849	assert os.read_file(os.join_path(b.root, 'notes.txt'))! == 'B edits\n'1850}18511852// A folder with files but no saves has nothing to combine with; a steal that1853// fast-forwarded into it would overwrite whatever shares a name.1854fn test_steal_into_a_folder_with_unsaved_files_refuses() {1855	base := scratch('steal_unsaved')!1856	defer {1857		os.rmdir_all(base) or {}1858	}1859	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1860	mut a := open_repo(machine('unsaved_a')!)!1861	defer {1862		a.close()1863	}1864	put(a.root, 'notes.txt', 'from A\n')!1865	make_save(a, 'A writes')!1866	offer_now(a, mut backend)!1867	b_root := machine('unsaved_b')!1868	mut b := storage.create(b_root)!1869	defer {1870		b.close()1871	}1872	put(b_root, 'notes.txt', 'never saved\n')!1873	// Only a repo that already knows its remote name gets this far.1874	b.set_state('remote_repo', 'proj')!1875	if _ := steal(b, mut backend, StealOptions{}) {1876		assert false, 'steal overwrote a folder with unsaved files'1877	} else {1878		assert err.msg() == no_saves_here1879	}1880	assert os.read_file(os.join_path(b_root, 'notes.txt'))! == 'never saved\n'1881	// A fresh `koh init` folder, holding only the default ignore list, is fine.1882	os.rm(os.join_path(b_root, 'notes.txt'))!1883	put(b_root, snapshot.ignore_file, snapshot.default_ignore)!1884	steal(b, mut backend, StealOptions{})!1885	assert os.read_file(os.join_path(b_root, 'notes.txt'))! == 'from A\n'1886}18871888// The document asks steal to warn about every incoming flagged save, so the1889// report names them.1890fn test_steal_reports_incoming_flagged_saves() {1891	base := scratch('flag_warn')!1892	defer {1893		os.rmdir_all(base) or {}1894	}1895	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1896	mut a := open_repo(machine('flag_warn_a')!)!1897	defer {1898		a.close()1899	}1900	mut b := open_repo(machine('flag_warn_b')!)!1901	defer {1902		b.close()1903	}1904	put(a.root, 'a.txt', 'one\n')!1905	make_save(a, 'fine')!1906	offer_now(a, mut backend)!1907	join(b, mut backend)!1908	put(a.root, 'a.txt', 'two\n')!1909	suspect := make_save(a, 'suspect')!1910	put(a.root, 'a.txt', 'three\n')!1911	make_save(a, 'also fine')!1912	events.flag(a, suspect.id, 'broke the build')!1913	offer_now(a, mut backend)!1914	report := steal_now(b, mut backend)!1915	assert report.flagged.map(it.save_id) == [suspect.id]1916	assert report.flagged[0].reason == 'broke the build'1917}19181919// head_of unwraps the head for tests that know the repo has saves.1920fn head_of(store &storage.Store) history.Save {1921	return history.head(store) or { panic('this repo has no head') }1922}19231924// A remote says what it is, so two koh versions never half-understand one1925// bucket. The first offer of a repo records the layout.1926fn test_the_first_offer_records_the_remote_format() {1927	base := scratch('format_write')!1928	defer {1929		os.rmdir_all(base) or {}1930	}1931	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1932	mut a := open_repo(machine('format_write_a')!)!1933	defer {1934		a.close()1935	}1936	put(a.root, 'a.txt', 'one\n')!1937	make_save(a, 'first')!1938	offer_now(a, mut backend)!1939	assert backend.get(format_key('proj'))!.body.bytestr().trim_space() == format_value1940}19411942// A repo offered before the key existed is version 1: it still syncs, and the1943// next offer records the key then.1944fn test_a_remote_without_a_format_still_syncs() {1945	base := scratch('format_old')!1946	defer {1947		os.rmdir_all(base) or {}1948	}1949	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1950	mut a := open_repo(machine('format_old_a')!)!1951	defer {1952		a.close()1953	}1954	put(a.root, 'a.txt', 'one\n')!1955	make_save(a, 'first')!1956	offer_now(a, mut backend)!1957	// Stand in for a bucket offered before the key existed.1958	backend.delete(format_key('proj'))!1959	mut b := open_repo(machine('format_old_b')!)!1960	defer {1961		b.close()1962	}1963	join(b, mut backend)!1964	assert head_of(b).id == head_of(a).id1965	put(a.root, 'a.txt', 'two\n')!1966	make_save(a, 'second')!1967	offer_now(a, mut backend)!1968	assert backend.get(format_key('proj'))!.body.bytestr().trim_space() == format_value1969	report := steal_now(b, mut backend)!1970	assert report.head == head_of(a).id1971}19721973// A remote that speaks another layout is refused loudly, on offer and on1974// steal, rather than half-read.1975fn test_an_unknown_remote_format_is_refused() {1976	base := scratch('format_unknown')!1977	defer {1978		os.rmdir_all(base) or {}1979	}1980	mut backend := remote.new_folder(os.join_path(base, 'remote'))!1981	mut a := open_repo(machine('format_bad_a')!)!1982	defer {1983		a.close()1984	}1985	put(a.root, 'a.txt', 'one\n')!1986	make_save(a, 'first')!1987	offer_now(a, mut backend)!1988	backend.delete(format_key('proj'))!1989	backend.put_if_absent(format_key('proj'), 'koh-remote 2'.bytes())!1990	if _ := offer_now(a, mut backend) {1991		assert false, 'offer must refuse a format it does not speak'1992	} else {1993		assert err.msg().contains('koh-remote 2')1994	}1995	if _ := steal_now(a, mut backend) {1996		assert false, 'steal must refuse a format it does not speak'1997	} else {1998		assert err.msg().contains('koh-remote 2')1999	}2000	if _ := fetch_repo(mut backend, 'proj') {2001		assert false, 'a steal must refuse a format it does not speak'2002	} else {2003		assert err.msg().contains('koh-remote 2')2004	}2005}20062007// Two machines offering a new repo at once both find no format key; the loser2008// of the conditional write must read back the winner's value and refuse it,2009// not carry on against a remote it cannot read.2010fn test_a_lost_format_write_is_read_back_and_refused() {2011	base := scratch('format_race')!2012	defer {2013		os.rmdir_all(base) or {}2014	}2015	mut inner := remote.new_folder(os.join_path(base, 'remote'))!2016	mut a := open_repo(machine('format_race_a')!)!2017	defer {2018		a.close()2019	}2020	put(a.root, 'a.txt', 'one\n')!2021	make_save(a, 'first')!2022	mut backend := remote.Backend(FaultyBackend{2023		inner:       inner2024		race_format: true2025	})2026	if _ := offer_now(a, mut backend) {2027		assert false, 'offer must refuse the format another machine wrote first'2028	} else {2029		assert err.msg().contains('koh-remote 2')2030	}2031}20322033fn test_a_bundle_lands_each_entry_however_it_is_split_and_refuses_a_cut_or_foreign_one() {2034	whole := 'objects/aa 3\nabcobjects/bb 0\nend 0\n'2035	for size in [1, 2, 5, whole.len] {2036		mut bundle := Bundle{}2037		for at := 0; at < whole.len; at += size {2038			bundle.feed(whole[at..int_min(at + size, whole.len)].bytes())!2039		}2040		bundle.finish()!2041		assert bundle.fetched.repo_objects == {2042			'aa': 'abc'.bytes()2043			'bb': []u8{}2044		}2045	}2046	for cut in ['objects/aa 3\nabc', 'objects/aa 4\nabc', 'objects/aa 3', 'objects/aa x\nabc',2047		'releases/v1 1\nx', 'end 0\nobjects/aa 3\nabc'] {2048		mut bundle := Bundle{}2049		bundle.feed(cut.bytes()) or { continue }2050		bundle.finish() or { continue }2051		assert false, cut2052	}2053}20542055fn test_strip_batch_rolls_back_all_paths_and_handles_overlap() {2056	mut store := open_repo(machine('strip_batch')!)!2057	defer { store.close() }2058	put(store.root, 'private/a', 'a')!2059	put(store.root, 'secret', 'secret')!2060	put(store.root, 'keep', 'keep')!2061	save := make_save(store, 'initial')!2062	store.db.exec("CREATE TRIGGER block_secret BEFORE DELETE ON save_files2063		WHEN OLD.path = 'secret' BEGIN SELECT RAISE(ABORT, 'blocked'); END")!2064	if _ := strip_local_batch(store, ['private', 'secret'], '') {2065		assert false, 'batch succeeded despite the second path failing'2066	}2067	assert history.files_of(store, save.id)!.map(it.path) == ['.kohignore', 'keep', 'private/a',2068		'secret']2069	assert events.strip_events(store)!.len == 02070	assert !strip_pending(store, 'private')2071	store.db.exec('DROP TRIGGER block_secret')!2072	reports := strip_local_batch(store, ['private', 'private/a', 'secret'], '')!2073	assert reports.map(it.files_removed) == [1, 0, 1]2074	assert history.files_of(store, save.id)!.map(it.path) == ['.kohignore', 'keep']2075	assert events.strip_events(store)!.len == 22076}20772078fn test_strip_batch_limits_every_path_to_selected_save() {2079	mut store := open_repo(machine('strip_batch_scope')!)!2080	defer { store.close() }2081	put(store.root, 'one', 'one')!2082	put(store.root, 'two', 'two')!2083	first := make_save(store, 'initial')!2084	put(store.root, 'keep', 'keep')!2085	second := make_save(store, 'next')!2086	strip_local_batch(store, ['one', 'two'], first.id)!2087	assert history.files_of(store, first.id)!.map(it.path) == ['.kohignore']2088	assert history.files_of(store, second.id)!.map(it.path) == ['.kohignore', 'keep', 'one', 'two']2089	assert events.strip_events(store)!.all(it.save_id == first.id)2090}20912092fn test_strip_batch_keeps_independent_remote_retry_notes() {2093	mut backend := remote.new_folder(scratch('strip_batch_remote')!)!2094	mut store := open_repo(machine('strip_batch_retry')!)!2095	defer { store.close() }2096	put(store.root, 'one', 'secret')!2097	put(store.root, 'two', 'secret')!2098	save := make_save(store, 'initial')!2099	offer_now(store, mut backend)!2100	strip_local_batch(store, ['one', 'two'], '')!2101	mut flaky := FaultyBackend{ inner: backend, fail_write: 1 }2102	if _ := send_strip(store, mut flaky, 'one') {2103		assert false, 'injected remote failure was not reported'2104	}2105	send_strip(store, mut backend, 'two')!2106	assert strip_pending(store, 'one') && !strip_pending(store, 'two')2107	partial := decode_save(backend.get(save_key('proj', save.id))!.body)!2108	assert partial.files.map(it.path) == ['.kohignore', 'one']2109	assert backend.get(object_key('proj', storage.hash_hex('secret'.bytes())))!.found2110	send_strip(store, mut backend, 'one')!2111	assert !strip_pending(store, 'one')2112	finished := decode_save(backend.get(save_key('proj', save.id))!.body)!2113	assert finished.files.map(it.path) == ['.kohignore']2114	assert !backend.get(object_key('proj', storage.hash_hex('secret'.bytes())))!.found2115}