From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Ware Subject: [PATCH v4] contrib/subtree: fix "subtree split" skipped-merge bug Date: Wed, 9 Dec 2015 13:19:37 +1300 Message-ID: <1449620377-30479-1-git-send-email-davidw@realtimegenomics.com> References: Cc: Dave Ware To: git@vger.kernel.org X-From: git-owner@vger.kernel.org Wed Dec 09 01:20:29 2015 Return-path: Envelope-to: gcvg-git-2@plane.gmane.org Received: from vger.kernel.org ([209.132.180.67]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1a6SUd-0000DD-PS for gcvg-git-2@plane.gmane.org; Wed, 09 Dec 2015 01:20:28 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752054AbbLIAUV (ORCPT ); Tue, 8 Dec 2015 19:20:21 -0500 Received: from mail-pa0-f44.google.com ([209.85.220.44]:36057 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751898AbbLIAUU (ORCPT ); Tue, 8 Dec 2015 19:20:20 -0500 Received: by pacdm15 with SMTP id dm15so19941779pac.3 for ; Tue, 08 Dec 2015 16:20:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=realtimegenomics-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Ln9xEQGT5LCF0QsXhnH5evoh/jTHk6/8a/IFXKXtRbU=; b=t9E/yoPsEqqIYEgqkoeu0dUecD3DTjDxC9fhbyQ0E2cWcXuqIKByppsEUMlBBx0/q1 YxltQv0x31spPWL0l/q6SzI/jHupJ4cTUFlD3GyDWZt6rpowrBQV1JuS1N0V3f0Be3ai oDU2tSdkPjbqxa0f9tmvQYAsrqrjrtDwIe+K0BRZma0r9UZvuvYCYgqIQhGEHtm/xScw jGv5D4aKTY2D9CDXKcWFO9ZCPzL0R6tBb8V4dXPKGs7ak66SR3mJdJrJbnO1I8YpawpZ oEp6QAsHigCj0S5s694n+r9aAkMQyb89hjy9Q0qyd5zyfIyXpLWVemSOvEF7EYKR8kA7 gG5Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Ln9xEQGT5LCF0QsXhnH5evoh/jTHk6/8a/IFXKXtRbU=; b=FInJWsCiE9AbAABlnFJ3vVnmfHK9v6tOfdiJAAUzXQLbe/ioIl3RPVFYZRIA40uryi KuptXZShx3xsS6dexJJNac06YbSZcNbh+V96BNB7bFWLmynmSRI2IRK7S7jfxtVq3XsR a1yO4ylkUCwXKf99IbYGJSCGVrf1TljZHB3G+ZKk/PyQEnFGh3F3RDu8XV4v/Tj2e1ag NYAJOOYxS0uLwHED193LdoiN4pdpdkrPJMuJE5wRDxmiqNYxrG3YThpuAEvPxda97P5f Mg6/YSE4IV5zc9N5igmKSZYtcMaNQ1/DvDHvP7J3aVnsSJ63v0FlElN0CDf9zX/IGRtC RArQ== X-Gm-Message-State: ALoCoQkWVcCU780S2Cw6/PsrY1aGwhzWRNkMue2AtXOPH77kCRx3+n0bBvBVQKMJbHCGWIEyM2OWKauU2AtP0XjAIrWcgRKxaA== X-Received: by 10.66.216.200 with SMTP id os8mr3934173pac.143.1449620419556; Tue, 08 Dec 2015 16:20:19 -0800 (PST) Received: from tinman.nz.realtimegenomics.com ([114.134.15.146]) by smtp.googlemail.com with ESMTPSA id 186sm7120329pfa.24.2015.12.08.16.20.16 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 08 Dec 2015 16:20:18 -0800 (PST) X-Mailer: git-send-email 1.9.1 In-Reply-To: Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: 'git subtree split' can incorrectly skip a merge even when both parents act on the subtree, provided the merge results in a tree identical to one of the parents. Fix by copying the merge if at least one parent is non-identical, and the non-identical parent is not an ancestor of the identical parent. Also, add a test case which checks that a descendant can be pushed to its ancestor in this case. Signed-off-by: Dave Ware --- Notes: Many thanks to Eric Sunshine and Junio Hamano for adivce on this patch Changes since v3: - Improvements to commit message - Removed incorrect use of --boundary on rev-list - Changed use of rev-list to use --count Changes since v2: - Minor improvements to commit message - Changed space indentation to tab indentation in test case - Changed use of rev-list for obtaining commit id to use rev-parse instead Changes since v1: - Minor improvements to commit message - Added sign off - Moved test case from own file into t7900-subtree.sh - Added subshell to test around 'cd' - Moved record of commit for cherry-pick to variable instead of dumping into file [v3]: http://thread.gmane.org/gmane.comp.version-control.git/282065/focus=282176 [v2]: http://thread.gmane.org/gmane.comp.version-control.git/282065/focus=282121 [v1]: http://thread.gmane.org/gmane.comp.version-control.git/282065 contrib/subtree/git-subtree.sh | 12 +++++++-- contrib/subtree/t/t7900-subtree.sh | 52 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+), 2 deletions(-) diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh index 9f06571..ebf99d9 100755 --- a/contrib/subtree/git-subtree.sh +++ b/contrib/subtree/git-subtree.sh @@ -479,8 +479,16 @@ copy_or_skip() p="$p -p $parent" fi done - - if [ -n "$identical" ]; then + + copycommit= + if [ -n "$identical" ] && [ -n "$nonidentical" ]; then + extras=$(git rev-list --count $identical..$nonidentical) + if [ "$extras" -ne 0 ]; then + # we need to preserve history along the other branch + copycommit=1 + fi + fi + if [ -n "$identical" ] && [ -z "$copycommit" ]; then echo $identical else copy_commit $rev $tree "$p" || exit $? diff --git a/contrib/subtree/t/t7900-subtree.sh b/contrib/subtree/t/t7900-subtree.sh index 9051982..710278c 100755 --- a/contrib/subtree/t/t7900-subtree.sh +++ b/contrib/subtree/t/t7900-subtree.sh @@ -468,4 +468,56 @@ test_expect_success 'verify one file change per commit' ' )) ' +test_expect_success 'subtree descendent check' ' + mkdir git_subtree_split_check && + ( + cd git_subtree_split_check && + git init && + + mkdir folder && + + echo a >folder/a && + git add . && + git commit -m "first commit" && + + git branch branch && + + echo 0 >folder/0 && + git add . && + git commit -m "adding 0 to folder" && + + echo b >folder/b && + git add . && + git commit -m "adding b to folder" && + cherry=$(git rev-parse HEAD) && + + git checkout branch && + echo text >textBranch.txt && + git add . && + git commit -m "commit to fiddle with branch: branch" && + + git cherry-pick $cherry && + git checkout master && + git merge -m "merge" branch && + + git branch noop_branch && + + echo d >folder/d && + git add . && + git commit -m "adding d to folder" && + + git checkout noop_branch && + echo moreText >anotherText.txt && + git add . && + git commit -m "irrelevant" && + + git checkout master && + git merge -m "second merge" noop_branch && + + git subtree split --prefix folder/ --branch subtree_tip master && + git subtree split --prefix folder/ --branch subtree_branch branch && + git push . subtree_tip:subtree_branch + ) + ' + test_done -- 1.9.1