From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-4.0 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_NONE shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 1AB4F1F463 for ; Sun, 15 Sep 2019 01:13:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727163AbfIOBNW (ORCPT ); Sat, 14 Sep 2019 21:13:22 -0400 Received: from cloud.peff.net ([104.130.231.41]:50562 "HELO cloud.peff.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1725805AbfIOBNV (ORCPT ); Sat, 14 Sep 2019 21:13:21 -0400 Received: (qmail 23292 invoked by uid 109); 15 Sep 2019 01:13:21 -0000 Received: from Unknown (HELO peff.net) (10.0.1.2) by cloud.peff.net (qpsmtpd/0.94) with SMTP; Sun, 15 Sep 2019 01:13:21 +0000 Authentication-Results: cloud.peff.net; auth=none Received: (qmail 28913 invoked by uid 111); 15 Sep 2019 01:15:25 -0000 Received: from sigill.intra.peff.net (HELO sigill.intra.peff.net) (10.0.0.7) by peff.net (qpsmtpd/0.94) with (TLS_AES_256_GCM_SHA384 encrypted) ESMTPS; Sat, 14 Sep 2019 21:15:25 -0400 Authentication-Results: peff.net; auth=none Date: Sat, 14 Sep 2019 21:13:20 -0400 From: Jeff King To: Jeff Hostetler Cc: Junio C Hamano , Jeff Hostetler , Jon Simons , git@vger.kernel.org, me@ttaylorr.com, sunshine@sunshineco.com, stolee@gmail.com Subject: [PATCH 2/3] list-objects-filter: delay parsing of sparse oid Message-ID: <20190915011319.GB11208@sigill.intra.peff.net> References: <20190915010942.GA19787@sigill.intra.peff.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190915010942.GA19787@sigill.intra.peff.net> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org The list-objects-filter code has two steps to its initialization: 1. parse_list_objects_filter() makes sure the spec is a filter we know about and is syntactically correct. This step is done by "rev-list" or "upload-pack" that is going to apply a filter, but also by "git clone" or "git fetch" before they send the spec across the wire. 2. list_objects_filter__init() runs the type-specific initialization (using function pointers established in step 1). This happens at the start of traverse_commit_list_filtered(), when we're about to actually use the filter. It's a good idea to parse as much as we can in step 1, in order to catch problems early (e.g., a blob size limit that isn't a number). But one thing we _shouldn't_ do is resolve any oids at that step (e.g., for sparse-file contents specified by oid). In the case of a fetch, the oid has to be resolved on the remote side. The current code does resolve the oid during the parse phase, but ignores any error (which we must do, because we might just be sending the spec across the wire). This leads to two bugs: - if we're not in a repository (e.g., because it's git-clone parsing the spec), then we trigger a BUG() trying to resolve the name - if we did hit the error case, we still have to notice that later and bail. The code path in rev-list handles this, but the one in upload-pack does not, leading to a segfault. We can fix both by moving the oid resolution into the sparse-oid init function. At that point we know we have a repository (because we're about to traverse), and handling the error there fixes the segfault. As a bonus, we can drop the NULL sparse_oid_value check in rev-list, since this is now handled in the sparse-oid-filter init function. Signed-off-by: Jeff King --- builtin/rev-list.c | 4 ---- list-objects-filter-options.c | 14 ++------------ list-objects-filter-options.h | 2 +- list-objects-filter.c | 11 +++++++++-- t/t5616-partial-clone.sh | 4 ++-- 5 files changed, 14 insertions(+), 21 deletions(-) diff --git a/builtin/rev-list.c b/builtin/rev-list.c index 301ccb970b..74dbfad73d 100644 --- a/builtin/rev-list.c +++ b/builtin/rev-list.c @@ -471,10 +471,6 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix) parse_list_objects_filter(&filter_options, arg); if (filter_options.choice && !revs.blob_objects) die(_("object filtering requires --objects")); - if (filter_options.choice == LOFC_SPARSE_OID && - !filter_options.sparse_oid_value) - die(_("invalid sparse value '%s'"), - filter_options.filter_spec); continue; } if (!strcmp(arg, ("--no-" CL_ARG__FILTER))) { diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c index 1cb20c659c..43f41f446c 100644 --- a/list-objects-filter-options.c +++ b/list-objects-filter-options.c @@ -63,17 +63,8 @@ static int gently_parse_list_objects_filter( return 0; } else if (skip_prefix(arg, "sparse:oid=", &v0)) { - struct object_context oc; - struct object_id sparse_oid; - - /* - * Try to parse into an OID for the current - * command, but DO NOT complain if we don't have the blob or - * ref locally. - */ - if (!get_oid_with_context(the_repository, v0, GET_OID_BLOB, - &sparse_oid, &oc)) - filter_options->sparse_oid_value = oiddup(&sparse_oid); + /* v0 points into filter_options->filter_spec; no allocation needed */ + filter_options->sparse_oid_name = v0; filter_options->choice = LOFC_SPARSE_OID; return 0; @@ -138,7 +129,6 @@ void list_objects_filter_release( struct list_objects_filter_options *filter_options) { free(filter_options->filter_spec); - free(filter_options->sparse_oid_value); memset(filter_options, 0, sizeof(*filter_options)); } diff --git a/list-objects-filter-options.h b/list-objects-filter-options.h index c54f0000fb..a819e42ffb 100644 --- a/list-objects-filter-options.h +++ b/list-objects-filter-options.h @@ -42,7 +42,7 @@ struct list_objects_filter_options { * choice-specific; not all values will be defined for any given * choice. */ - struct object_id *sparse_oid_value; + const char *sparse_oid_name; unsigned long blob_limit_value; unsigned long tree_exclude_depth; }; diff --git a/list-objects-filter.c b/list-objects-filter.c index 36e1f774bc..d2cdc03a73 100644 --- a/list-objects-filter.c +++ b/list-objects-filter.c @@ -463,9 +463,16 @@ static void *filter_sparse_oid__init( filter_free_fn *filter_free_fn) { struct filter_sparse_data *d = xcalloc(1, sizeof(*d)); + struct object_context oc; + struct object_id sparse_oid; + + if (get_oid_with_context(the_repository, + filter_options->sparse_oid_name, + GET_OID_BLOB, &sparse_oid, &oc)) + die("unable to access sparse blob in '%s'", + filter_options->sparse_oid_name); d->omits = omitted; - if (add_excludes_from_blob_to_list(filter_options->sparse_oid_value, - NULL, 0, &d->el) < 0) + if (add_excludes_from_blob_to_list(&sparse_oid, NULL, 0, &d->el) < 0) die("could not load filter specification"); ALLOC_GROW(d->array_frame, d->nr + 1, d->alloc); diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh index 0bdbc819f1..84365b802a 100755 --- a/t/t5616-partial-clone.sh +++ b/t/t5616-partial-clone.sh @@ -252,7 +252,7 @@ test_expect_success 'setup src repo for sparse filter' ' git -C sparse-src commit -m "add sparse checkout files" ' -test_expect_failure 'partial clone with sparse filter succeeds' ' +test_expect_success 'partial clone with sparse filter succeeds' ' rm -rf dst.git && git clone --no-local --bare \ --filter=sparse:oid=master:only-one \ @@ -265,7 +265,7 @@ test_expect_failure 'partial clone with sparse filter succeeds' ' ) ' -test_expect_failure 'partial clone with unresolvable sparse filter fails cleanly' ' +test_expect_success 'partial clone with unresolvable sparse filter fails cleanly' ' rm -rf dst.git && test_must_fail git clone --no-local --bare \ --filter=sparse:oid=master:no-such-name \ -- 2.23.0.667.gcccf1fbb03