commit e9823c5da4fa977c46bcb97167fbdd0d70adb5ff Author: Robert Hensing <robert@roberthensing.nl> Date: Mon Aug 26 20:07:04 2024 +0200 Make packbuilder interruptible using progress callback Forward errors from packbuilder->progress_cb This allows the callback to terminate long-running operations when the application is interrupted. diff --git a/include/git2/pack.h b/include/git2/pack.h index 0f6bd2ab9..bee72a6c0 100644 --- a/include/git2/pack.h +++ b/include/git2/pack.h @@ -247,6 +247,9 @@ typedef int GIT_CALLBACK(git_packbuilder_progress)( * @param progress_cb Function to call with progress information during * pack building. Be aware that this is called inline with pack building * operations, so performance may be affected. + * When progress_cb returns an error, the pack building process will be + * aborted and the error will be returned from the invoked function. + * `pb` must then be freed. * @param progress_cb_payload Payload for progress callback. * @return 0 or an error code */ diff --git a/src/libgit2/pack-objects.c b/src/libgit2/pack-objects.c index b2d80cba9..7c331c2d5 100644 --- a/src/libgit2/pack-objects.c +++ b/src/libgit2/pack-objects.c @@ -932,6 +932,9 @@ static int report_delta_progress( { int ret; + if (pb->failure) + return pb->failure; + if (pb->progress_cb) { uint64_t current_time = git_time_monotonic(); uint64_t elapsed = current_time - pb->last_progress_report_time; @@ -943,8 +946,10 @@ static int report_delta_progress( GIT_PACKBUILDER_DELTAFICATION, count, pb->nr_objects, pb->progress_cb_payload); - if (ret) + if (ret) { + pb->failure = ret; return git_error_set_after_callback(ret); + } } } @@ -976,7 +981,10 @@ static int find_deltas(git_packbuilder *pb, git_pobject **list, } pb->nr_deltified += 1; - report_delta_progress(pb, pb->nr_deltified, false); + if ((error = report_delta_progress(pb, pb->nr_deltified, false)) < 0) { + GIT_ASSERT(git_packbuilder__progress_unlock(pb) == 0); + goto on_error; + } po = *list++; (*list_size)--; @@ -1124,6 +1132,10 @@ struct thread_params { size_t depth; size_t working; size_t data_ready; + + /* A pb->progress_cb can stop the packing process by returning an error. + When that happens, all threads observe the error and stop voluntarily. */ + bool stopped; }; static void *threaded_find_deltas(void *arg) @@ -1133,7 +1145,12 @@ static void *threaded_find_deltas(void *arg) while (me->remaining) { if (find_deltas(me->pb, me->list, &me->remaining, me->window, me->depth) < 0) { - ; /* TODO */ + me->stopped = true; + GIT_ASSERT_WITH_RETVAL(git_packbuilder__progress_lock(me->pb) == 0, NULL); + me->working = false; + git_cond_signal(&me->pb->progress_cond); + GIT_ASSERT_WITH_RETVAL(git_packbuilder__progress_unlock(me->pb) == 0, NULL); + return NULL; } GIT_ASSERT_WITH_RETVAL(git_packbuilder__progress_lock(me->pb) == 0, NULL); @@ -1175,8 +1192,7 @@ static int ll_find_deltas(git_packbuilder *pb, git_pobject **list, pb->nr_threads = git__online_cpus(); if (pb->nr_threads <= 1) { - find_deltas(pb, list, &list_size, window, depth); - return 0; + return find_deltas(pb, list, &list_size, window, depth); } p = git__mallocarray(pb->nr_threads, sizeof(*p)); @@ -1195,6 +1211,7 @@ static int ll_find_deltas(git_packbuilder *pb, git_pobject **list, p[i].depth = depth; p[i].working = 1; p[i].data_ready = 0; + p[i].stopped = 0; /* try to split chunks on "path" boundaries */ while (sub_size && sub_size < list_size && @@ -1262,7 +1279,7 @@ static int ll_find_deltas(git_packbuilder *pb, git_pobject **list, (!victim || victim->remaining < p[i].remaining)) victim = &p[i]; - if (victim) { + if (victim && !target->stopped) { sub_size = victim->remaining / 2; list = victim->list + victim->list_size - sub_size; while (sub_size && list[0]->hash && @@ -1286,7 +1303,7 @@ static int ll_find_deltas(git_packbuilder *pb, git_pobject **list, } target->list_size = sub_size; target->remaining = sub_size; - target->working = 1; + target->working = 1; /* even when target->stopped, so that we don't process this thread again */ GIT_ASSERT(git_packbuilder__progress_unlock(pb) == 0); if (git_mutex_lock(&target->mutex)) { @@ -1299,7 +1316,7 @@ static int ll_find_deltas(git_packbuilder *pb, git_pobject **list, git_cond_signal(&target->cond); git_mutex_unlock(&target->mutex); - if (!sub_size) { + if (target->stopped || !sub_size) { git_thread_join(&target->thread, NULL); git_cond_free(&target->cond); git_mutex_free(&target->mutex); @@ -1308,7 +1325,7 @@ static int ll_find_deltas(git_packbuilder *pb, git_pobject **list, } git__free(p); - return 0; + return pb->failure; } #else @@ -1319,6 +1336,7 @@ int git_packbuilder__prepare(git_packbuilder *pb) { git_pobject **delta_list; size_t i, n = 0; + int error; if (pb->nr_objects == 0 || pb->done) return 0; /* nothing to do */ @@ -1327,8 +1345,10 @@ int git_packbuilder__prepare(git_packbuilder *pb) * Although we do not report progress during deltafication, we * at least report that we are in the deltafication stage */ - if (pb->progress_cb) - pb->progress_cb(GIT_PACKBUILDER_DELTAFICATION, 0, pb->nr_objects, pb->progress_cb_payload); + if (pb->progress_cb) { + if ((error = pb->progress_cb(GIT_PACKBUILDER_DELTAFICATION, 0, pb->nr_objects, pb->progress_cb_payload)) < 0) + return git_error_set_after_callback(error); + } delta_list = git__mallocarray(pb->nr_objects, sizeof(*delta_list)); GIT_ERROR_CHECK_ALLOC(delta_list); @@ -1345,31 +1365,33 @@ int git_packbuilder__prepare(git_packbuilder *pb) if (n > 1) { git__tsort((void **)delta_list, n, type_size_sort); - if (ll_find_deltas(pb, delta_list, n, + if ((error = ll_find_deltas(pb, delta_list, n, GIT_PACK_WINDOW + 1, - GIT_PACK_DEPTH) < 0) { + GIT_PACK_DEPTH)) < 0) { git__free(delta_list); - return -1; + return error; } } - report_delta_progress(pb, pb->nr_objects, true); + error = report_delta_progress(pb, pb->nr_objects, true); pb->done = true; git__free(delta_list); - return 0; + return error; } -#define PREPARE_PACK if (git_packbuilder__prepare(pb) < 0) { return -1; } +#define PREPARE_PACK error = git_packbuilder__prepare(pb); if (error < 0) { return error; } int git_packbuilder_foreach(git_packbuilder *pb, int (*cb)(void *buf, size_t size, void *payload), void *payload) { + int error; PREPARE_PACK; return write_pack(pb, cb, payload); } int git_packbuilder__write_buf(git_str *buf, git_packbuilder *pb) { + int error; PREPARE_PACK; return write_pack(pb, &write_pack_buf, buf); diff --git a/src/libgit2/pack-objects.h b/src/libgit2/pack-objects.h index bbc8b9430..380a28ebe 100644 --- a/src/libgit2/pack-objects.h +++ b/src/libgit2/pack-objects.h @@ -100,6 +100,10 @@ struct git_packbuilder { uint64_t last_progress_report_time; bool done; + + /* A non-zero error code in failure causes all threads to shut themselves + down. Some functions will return this error code. */ + volatile int failure; }; int git_packbuilder__write_buf(git_str *buf, git_packbuilder *pb); diff --git a/tests/libgit2/pack/cancel.c b/tests/libgit2/pack/cancel.c new file mode 100644 index 000000000..a0aa9716a --- /dev/null +++ b/tests/libgit2/pack/cancel.c @@ -0,0 +1,240 @@ +#include "clar_libgit2.h" +#include "futils.h" +#include "pack.h" +#include "hash.h" +#include "iterator.h" +#include "vector.h" +#include "posix.h" +#include "hash.h" +#include "pack-objects.h" + +static git_repository *_repo; +static git_revwalk *_revwalker; +static git_packbuilder *_packbuilder; +static git_indexer *_indexer; +static git_vector _commits; +static int _commits_is_initialized; +static git_indexer_progress _stats; + +extern bool git_disable_pack_keep_file_checks; + +static void pack_packbuilder_init(const char *sandbox) { + _repo = cl_git_sandbox_init(sandbox); + /* cl_git_pass(p_chdir(sandbox)); */ + cl_git_pass(git_revwalk_new(&_revwalker, _repo)); + cl_git_pass(git_packbuilder_new(&_packbuilder, _repo)); + cl_git_pass(git_vector_init(&_commits, 0, NULL)); + _commits_is_initialized = 1; + memset(&_stats, 0, sizeof(_stats)); + p_fsync__cnt = 0; +} + +void test_pack_cancel__initialize(void) +{ + pack_packbuilder_init("small.git"); +} + +void test_pack_cancel__cleanup(void) +{ + git_oid *o; + unsigned int i; + + cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_FSYNC_GITDIR, 0)); + cl_git_pass(git_libgit2_opts(GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKS, false)); + + if (_commits_is_initialized) { + _commits_is_initialized = 0; + git_vector_foreach(&_commits, i, o) { + git__free(o); + } + git_vector_free(&_commits); + } + + git_packbuilder_free(_packbuilder); + _packbuilder = NULL; + + git_revwalk_free(_revwalker); + _revwalker = NULL; + + git_indexer_free(_indexer); + _indexer = NULL; + + /* cl_git_pass(p_chdir("..")); */ + cl_git_sandbox_cleanup(); + _repo = NULL; +} + +static int seed_packbuilder(void) +{ + int error; + git_oid oid, *o; + unsigned int i; + + git_revwalk_sorting(_revwalker, GIT_SORT_TIME); + cl_git_pass(git_revwalk_push_ref(_revwalker, "HEAD")); + + while (git_revwalk_next(&oid, _revwalker) == 0) { + o = git__malloc(sizeof(git_oid)); + cl_assert(o != NULL); + git_oid_cpy(o, &oid); + cl_git_pass(git_vector_insert(&_commits, o)); + } + + git_vector_foreach(&_commits, i, o) { + if((error = git_packbuilder_insert(_packbuilder, o, NULL)) < 0) + return error; + } + + git_vector_foreach(&_commits, i, o) { + git_object *obj; + cl_git_pass(git_object_lookup(&obj, _repo, o, GIT_OBJECT_COMMIT)); + error = git_packbuilder_insert_tree(_packbuilder, + git_commit_tree_id((git_commit *)obj)); + git_object_free(obj); + if (error < 0) + return error; + } + + return 0; +} + +static int fail_stage; + +static int packbuilder_cancel_after_n_calls_cb(int stage, uint32_t current, uint32_t total, void *payload) +{ + + /* Force the callback to run again on the next opportunity regardless + of how fast we're running. */ + _packbuilder->last_progress_report_time = 0; + + if (stage == fail_stage) { + int *calls = (int *)payload; + int n = *calls; + /* Always decrement, including past zero. This way the error is only + triggered once, making sure it is picked up immediately. */ + --*calls; + if (n == 0) + return GIT_EUSER; + } + + return 0; +} + +static void test_cancel(int n) +{ + + int calls_remaining = n; + int err; + git_buf buf = GIT_BUF_INIT; + + /* Switch to a small repository, so that `packbuilder_cancel_after_n_calls_cb` + can hack the time to call the callback on every opportunity. */ + + cl_git_pass(git_packbuilder_set_callbacks(_packbuilder, &packbuilder_cancel_after_n_calls_cb, &calls_remaining)); + err = seed_packbuilder(); + if (!err) + err = git_packbuilder_write_buf(&buf, _packbuilder); + + cl_assert_equal_i(GIT_EUSER, err); +} +void test_pack_cancel__cancel_after_add_0(void) +{ + fail_stage = GIT_PACKBUILDER_ADDING_OBJECTS; + test_cancel(0); +} + +void test_pack_cancel__cancel_after_add_1(void) +{ + cl_skip(); + fail_stage = GIT_PACKBUILDER_ADDING_OBJECTS; + test_cancel(1); +} + +void test_pack_cancel__cancel_after_delta_0(void) +{ + fail_stage = GIT_PACKBUILDER_DELTAFICATION; + test_cancel(0); +} + +void test_pack_cancel__cancel_after_delta_1(void) +{ + fail_stage = GIT_PACKBUILDER_DELTAFICATION; + test_cancel(1); +} + +void test_pack_cancel__cancel_after_delta_0_threaded(void) +{ +#ifdef GIT_THREADS + git_packbuilder_set_threads(_packbuilder, 8); + fail_stage = GIT_PACKBUILDER_DELTAFICATION; + test_cancel(0); +#else + cl_skip(); +#endif +} + +void test_pack_cancel__cancel_after_delta_1_threaded(void) +{ +#ifdef GIT_THREADS + git_packbuilder_set_threads(_packbuilder, 8); + fail_stage = GIT_PACKBUILDER_DELTAFICATION; + test_cancel(1); +#else + cl_skip(); +#endif +} + +static int foreach_cb(void *buf, size_t len, void *payload) +{ + git_indexer *idx = (git_indexer *) payload; + cl_git_pass(git_indexer_append(idx, buf, len, &_stats)); + return 0; +} + +void test_pack_cancel__foreach(void) +{ + git_indexer *idx; + + seed_packbuilder(); + +#ifdef GIT_EXPERIMENTAL_SHA256 + cl_git_pass(git_indexer_new(&idx, ".", GIT_OID_SHA1, NULL)); +#else + cl_git_pass(git_indexer_new(&idx, ".", 0, NULL, NULL)); +#endif + + cl_git_pass(git_packbuilder_foreach(_packbuilder, foreach_cb, idx)); + cl_git_pass(git_indexer_commit(idx, &_stats)); + git_indexer_free(idx); +} + +static int foreach_cancel_cb(void *buf, size_t len, void *payload) +{ + git_indexer *idx = (git_indexer *)payload; + cl_git_pass(git_indexer_append(idx, buf, len, &_stats)); + return (_stats.total_objects > 2) ? -1111 : 0; +} + +void test_pack_cancel__foreach_with_cancel(void) +{ + git_indexer *idx; + + seed_packbuilder(); + +#ifdef GIT_EXPERIMENTAL_SHA256 + cl_git_pass(git_indexer_new(&idx, ".", GIT_OID_SHA1, NULL)); +#else + cl_git_pass(git_indexer_new(&idx, ".", 0, NULL, NULL)); +#endif + + cl_git_fail_with( + git_packbuilder_foreach(_packbuilder, foreach_cancel_cb, idx), -1111); + git_indexer_free(idx); +} + +void test_pack_cancel__keep_file_check(void) +{ + assert(!git_disable_pack_keep_file_checks); + 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