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: AS53758 23.128.96.0/24 X-Spam-Status: No, score=-3.7 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE, SPF_HELO_PASS,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by dcvr.yhbt.net (Postfix) with ESMTP id 04F441F9E5 for ; Thu, 22 Jul 2021 05:05:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229955AbhGVEYl (ORCPT ); Thu, 22 Jul 2021 00:24:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229927AbhGVEYW (ORCPT ); Thu, 22 Jul 2021 00:24:22 -0400 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA4B4C0613C1 for ; Wed, 21 Jul 2021 22:04:57 -0700 (PDT) Received: by mail-wr1-x42f.google.com with SMTP id l7so4457765wrv.7 for ; Wed, 21 Jul 2021 22:04:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=EmP26rVYFu+5DDOXiB3E0xPtqgcGXQ2j4BGSsFSir/M=; b=Owuz0ZnIejgk+xFWymvcA50KgO5tAlyFg3r85nfBUbfztqBJGssBkqyT+BgKunXtNE OvAtEqZmlxCKHbpJPV6X9GpiPZWrhb7rqyuKcVfSlaUf8VNCZGEKNN5Dw1A9T8e8t70W 7/Qp8pjENooJi0lQrTO364lU+1gidw4bOXfha8gzIfz5XD8sKOvB3mx/XSCG+VkwREoK Jt5i18cnGWzGe+9/BqavsC5ZssQInQ6Ozm9W5D1PqIhyggqCqrf8zu0N3dYfO/aNiABb QrdlELezazOfmyj+sytxVeHAU0Gi1fg74OZNoFSuqfx1Ko84BmLPlR+EC5p8d+lwAbDm 4GeA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=EmP26rVYFu+5DDOXiB3E0xPtqgcGXQ2j4BGSsFSir/M=; b=F/jr75StDx5ZPZD5LoBQqMkqrfPDIWaSorQYGwgvsSw+7g5N0b2dkI52hUQDYi9InD fF8828PTNS1jKBsCUqCH58TSVinXU0yFawSEU1cqto1z4QGn+5/zHkvRlR0ScM6NJoWI LjgMpd2jao8WaD7zFa/EITKbtuRsmJt4FUdD0j0VgveZB/gPRUYcD843hmRny8hlr9tb pHpIrLZZ5r75c6i15A6Ofi+cmKN+vAe1J9yojqx0OwGOMxCiODLUU/ly2GZyaq6e71Xd fQ3/Czn5clZkF5rK5VGvs5A/chYeJV37dk6N6L9hE4DVJVyKfa/5pxYnrAkzjEbQpIhC eZwQ== X-Gm-Message-State: AOAM532g03yOTz4r7A4fCznkYKrBcn6u/GyIwhVxf3EN4vl/HVVLIaK5 z5BBqvs5LyY4o1LK5PHVOkgrr1GWGDY= X-Google-Smtp-Source: ABdhPJz9yGk8h0mejz1m4vJ4w5J+FIuW3ZYBX6ZdYAWUSYOjOsEp7PiyiAbaBrBB/2KfxezkNFXUZg== X-Received: by 2002:adf:8b1d:: with SMTP id n29mr46991404wra.291.1626930296495; Wed, 21 Jul 2021 22:04:56 -0700 (PDT) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id n7sm12712982wrw.77.2021.07.21.22.04.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 22:04:56 -0700 (PDT) Message-Id: <768dec715582640ca6a48b3e158d1a61e422d0cc.1626930290.git.gitgitgadget@gmail.com> In-Reply-To: References: From: "Elijah Newren via GitGitGadget" Date: Thu, 22 Jul 2021 05:04:50 +0000 Subject: [PATCH v3 8/8] pull: fix handling of multiple heads Fcc: Sent Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 To: git@vger.kernel.org Cc: Alex Henrie , Son Luong Ngoc , Matthias Baumgarten , Eric Sunshine , =?UTF-8?Q?=C3=86var_Arnfj=C3=B6r=C3=B0?= Bjarmason , Elijah Newren , Felipe Contreras , Elijah Newren , Elijah Newren Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Elijah Newren With multiple heads, we should not allow rebasing or fast-forwarding. Make sure any fast-forward request calls out specifically the fact that multiple branches are in play. Also, since we cannot fast-forward to multiple branches, fix our computation of can_ff. Signed-off-by: Elijah Newren --- builtin/pull.c | 18 ++++++++++++++---- t/t7601-merge-pull-config.sh | 2 +- 2 files changed, 15 insertions(+), 5 deletions(-) diff --git a/builtin/pull.c b/builtin/pull.c index 2f1d1f4037d..b311ea6b9df 100644 --- a/builtin/pull.c +++ b/builtin/pull.c @@ -913,12 +913,18 @@ static int run_rebase(const struct object_id *newbase, return ret; } -static int get_can_ff(struct object_id *orig_head, struct object_id *orig_merge_head) +static int get_can_ff(struct object_id *orig_head, + struct oid_array *merge_heads) { int ret; struct commit_list *list = NULL; struct commit *merge_head, *head; + struct object_id *orig_merge_head; + if (merge_heads->nr > 1) + return 0; + + orig_merge_head = &merge_heads->oid[0]; head = lookup_commit_reference(the_repository, orig_head); commit_list_insert(head, &list); merge_head = lookup_commit_reference(the_repository, orig_merge_head); @@ -1057,10 +1063,14 @@ int cmd_pull(int argc, const char **argv, const char *prefix) die(_("Cannot merge multiple branches into empty head.")); return pull_into_void(merge_heads.oid, &curr_head); } - if (opt_rebase && merge_heads.nr > 1) - die(_("Cannot rebase onto multiple branches.")); + if (merge_heads.nr > 1) { + if (opt_rebase) + die(_("Cannot rebase onto multiple branches.")); + if (opt_ff && !strcmp(opt_ff, "--ff-only")) + die(_("Cannot fast-forward to multiple branches.")); + } - can_ff = get_can_ff(&orig_head, &merge_heads.oid[0]); + can_ff = get_can_ff(&orig_head, &merge_heads); /* ff-only takes precedence over rebase */ if (opt_ff && !strcmp(opt_ff, "--ff-only")) { diff --git a/t/t7601-merge-pull-config.sh b/t/t7601-merge-pull-config.sh index 742ed3981c7..1f652f433ee 100755 --- a/t/t7601-merge-pull-config.sh +++ b/t/t7601-merge-pull-config.sh @@ -331,7 +331,7 @@ test_expect_success 'Multiple heads warns about inability to fast forward' ' test_i18ngrep "You have divergent branches" err ' -test_expect_failure 'Multiple can never be fast forwarded' ' +test_expect_success 'Multiple can never be fast forwarded' ' git reset --hard c0 && test_must_fail git -c pull.ff=only pull . c1 c2 c3 2>err && test_i18ngrep ! "You have divergent branches" err && -- gitgitgadget