From patchwork Tue Mar 26 19:31:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Tan X-Patchwork-Id: 10872121 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6CD3717E6 for ; Tue, 26 Mar 2019 19:31:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5787628DD3 for ; Tue, 26 Mar 2019 19:31:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4978B28DD2; Tue, 26 Mar 2019 19:31:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 23AB328DD3 for ; Tue, 26 Mar 2019 19:31:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731816AbfCZTbd (ORCPT ); Tue, 26 Mar 2019 15:31:33 -0400 Received: from mail-pg1-f201.google.com ([209.85.215.201]:53787 "EHLO mail-pg1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727492AbfCZTbd (ORCPT ); Tue, 26 Mar 2019 15:31:33 -0400 Received: by mail-pg1-f201.google.com with SMTP id f7so206217pgi.20 for ; Tue, 26 Mar 2019 12:31:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=un6dj5SXCZw1KfkrajSyDwN3y+4VbTuumKOjqJg43Do=; b=jquW1gH3kxRBC8HXi119W+pPyn0AOOMhVPZEa5e8F6rbSsx7SaU5b5nraHgvEIC9/x zKDLkzm8NarmT1JFqWcW2NkafzkdHM8CvKzrs/9acWIi8SY1wTrHkKYyUO9qVErjea3m Nottn4P4/Qx7WkicaC7MOuHCSAN/YZHSsu+cWyxuhifIv3Z79Ta6Dw3QMUdVsnXE/53n Rfw4bwhi/zY5MqNp+lsITav3l9AsIKxdPQZEe6WUXSAMkHncPKBhj9rBTmGQZTA1DuFI gXQLtnH/3+wAfVRPl/7qyeHCbkzwLsCyphVQWICpwMfnDFJOu30P8BcRLNQxVe406m72 EiiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=un6dj5SXCZw1KfkrajSyDwN3y+4VbTuumKOjqJg43Do=; b=nM20td9m33NWXFv/iOpjPgVFnPQAw24VkiazP90A/EWyLRWQNbGn0WGV6VJkX5KoxY dB+RY25/LH1psaB7JJlmG14ktdgaoVwihS7ggbsdLZbLVBUVoCwNytbNbYAgVmOVLeMC NMK7IM1MnOSmtjT0l4rsEFqU+QixNJ+EVYC6lf2dj3ukgoWk4OiK/voiSY8niC19yRVU et+1NNBbBypkI6KIGxNei6HYAo7++PRmGOu1sAWnsbXbys1r3ZntHQ2kPYw9Mwf3uAQw ZC1n8ZiySFRlHtmpbNvlPfThCbRw2Yvzam7CJ1+4ZZEaBWLAPT2tZuzRKAmrVxXX1K7I E0kA== X-Gm-Message-State: APjAAAU3qQNDr5mdhExpUKn7ZRLsnbLimvJBBSlQi1sGCVEKRV1Pj5wK 72MwRdX5Q8h70d00dXkxA7DzrgbGs86upA5B8D63DCVTS2rPdya+uugn6umDB5B1Uxs3b9mVHOK u9ifMh4Yah0G85deBfDNTSqVxw7s4kdmTJsdWp6Uu3p5WO4Lk6KtxivuQuN/HAFzjIauJThjUTK AJ X-Google-Smtp-Source: APXvYqz/mtXatT9yMkZkDKPBv1flZ/HUV37UedQBq4X+d3yacZvZpjsTc8m4vjwiI8UWuVuz33ZtOn7CpW3XCRCDcIgz X-Received: by 2002:a63:2045:: with SMTP id r5mr30045997pgm.394.1553628692582; Tue, 26 Mar 2019 12:31:32 -0700 (PDT) Date: Tue, 26 Mar 2019 12:31:21 -0700 In-Reply-To: Message-Id: <3f65698610c1e3d1bc8acf76a24a6cabc554ff9b.1553628494.git.jonathantanmy@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.155.ge902e9bcae.dirty Subject: [PATCH v3 2/2] fetch-pack: respect --no-update-shallow in v2 From: Jonathan Tan To: git@vger.kernel.org Cc: Jonathan Tan , peff@peff.net Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In protocol v0, when sending "shallow" lines, the server distinguishes between lines caused by the remote repo being shallow and lines caused by client-specified depth settings. Unless "--update-shallow" is specified, there is a difference in behavior: refs that reach the former "shallow" lines, but not the latter, are rejected. But in v2, the server does not, and the client treats all "shallow" lines like lines caused by client-specified depth settings. Full restoration of v0 functionality is not possible without protocol change, but we can implement a heuristic: if we specify any depth setting, treat all "shallow" lines like lines caused by client-specified depth settings (that is, unaffected by "--no-update-shallow"), but otherwise, treat them like lines caused by the remote repo being shallow (that is, affected by "--no-update-shallow"). This restores most of v0 behavior, except in the case where a client fetches from a shallow repository with depth settings. This patch causes a test that previously failed with GIT_TEST_PROTOCOL_VERSION=2 to pass. Signed-off-by: Jonathan Tan --- fetch-pack.c | 41 ++++++++++++++++++++++++++++++++++------- 1 file changed, 34 insertions(+), 7 deletions(-) diff --git a/fetch-pack.c b/fetch-pack.c index ebb24ada24..4831eb6a25 100644 --- a/fetch-pack.c +++ b/fetch-pack.c @@ -1253,9 +1253,11 @@ static int process_acks(struct fetch_negotiator *negotiator, } static void receive_shallow_info(struct fetch_pack_args *args, - struct packet_reader *reader) + struct packet_reader *reader, + struct oid_array *shallows, + struct shallow_info *si) { - int line_received = 0; + int unshallow_received = 0; process_section_header(reader, "shallow-info", 0); while (packet_reader_read(reader) == PACKET_READ_NORMAL) { @@ -1265,8 +1267,7 @@ static void receive_shallow_info(struct fetch_pack_args *args, if (skip_prefix(reader->line, "shallow ", &arg)) { if (get_oid_hex(arg, &oid)) die(_("invalid shallow line: %s"), reader->line); - register_shallow(the_repository, &oid); - line_received = 1; + oid_array_append(shallows, &oid); continue; } if (skip_prefix(reader->line, "unshallow ", &arg)) { @@ -1279,7 +1280,7 @@ static void receive_shallow_info(struct fetch_pack_args *args, die(_("error in object: %s"), reader->line); if (unregister_shallow(&oid)) die(_("no shallow found: %s"), reader->line); - line_received = 1; + unshallow_received = 1; continue; } die(_("expected shallow/unshallow, got %s"), reader->line); @@ -1289,10 +1290,31 @@ static void receive_shallow_info(struct fetch_pack_args *args, reader->status != PACKET_READ_DELIM) die(_("error processing shallow info: %d"), reader->status); - if (line_received) { + if (args->deepen || unshallow_received) { + /* + * Treat these as shallow lines caused by our depth settings. + * In v0, these lines cannot cause refs to be rejected; do the + * same. + */ + int i; + + for (i = 0; i < shallows->nr; i++) + register_shallow(the_repository, &shallows->oid[i]); setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL); args->deepen = 1; + } else if (shallows->nr) { + /* + * Treat these as shallow lines caused by the remote being + * shallow. In v0, remote refs that reach these objects are + * rejected (unless --update-shallow is set); do the same. + */ + prepare_shallow_info(si, shallows); + if (si->nr_ours || si->nr_theirs) + alternate_shallow_file = + setup_temporary_shallow(si->shallow); + else + alternate_shallow_file = NULL; } else { alternate_shallow_file = NULL; } @@ -1337,6 +1359,8 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, int fd[2], const struct ref *orig_ref, struct ref **sought, int nr_sought, + struct oid_array *shallows, + struct shallow_info *si, char **pack_lockfile) { struct ref *ref = copy_ref_list(orig_ref); @@ -1411,7 +1435,7 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, case FETCH_GET_PACK: /* Check for shallow-info section */ if (process_section_header(&reader, "shallow-info", 1)) - receive_shallow_info(args, &reader); + receive_shallow_info(args, &reader, shallows, si); if (process_section_header(&reader, "wanted-refs", 1)) receive_wanted_refs(&reader, sought, nr_sought); @@ -1625,6 +1649,7 @@ struct ref *fetch_pack(struct fetch_pack_args *args, { struct ref *ref_cpy; struct shallow_info si; + struct oid_array shallows_scratch = OID_ARRAY_INIT; fetch_pack_setup(); if (nr_sought) @@ -1653,6 +1678,7 @@ struct ref *fetch_pack(struct fetch_pack_args *args, BUG("Protocol V2 does not provide shallows at this point in the fetch"); memset(&si, 0, sizeof(si)); ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought, + &shallows_scratch, &si, pack_lockfile); } else { prepare_shallow_info(&si, shallow); @@ -1680,6 +1706,7 @@ struct ref *fetch_pack(struct fetch_pack_args *args, update_shallow(args, sought, nr_sought, &si); cleanup: clear_shallow_info(&si); + oid_array_clear(&shallows_scratch); return ref_cpy; }