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=-3.9 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_HI, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,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 172191F5AD for ; Sat, 11 Apr 2020 02:44:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726690AbgDKCoc (ORCPT ); Fri, 10 Apr 2020 22:44:32 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:45482 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726663AbgDKCoc (ORCPT ); Fri, 10 Apr 2020 22:44:32 -0400 Received: by mail-wr1-f66.google.com with SMTP id v5so4203629wrp.12 for ; Fri, 10 Apr 2020 19:44:32 -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=3UKkrNollMxOCF3COKvL0YNkyQfsg0h7u9ryo5UdsJM=; b=aU0zqr8e5lkcfSZhvnOrZkXLsy3BjSNLj+5qacoqwrHobB0VLDKT9Q7sEerzFAuq/f AfJCmwCbCi+g/EdU/3FQjvfGRjzEbLBEhtqP1sYRyioG6YvdnyaqAXO2U9VqHSE4Dewr QGLXDo049SzIBzf7L4Aa7/Im8Vy51nZzOCuWrVxoQPRWWa+2ZIDChZqwYSJl1cEKhNIl ZvVU8/KnQg+qorw9iQOoi6/M5QKXHKWj7pMzkZ18E6XunDk0EwJGEGckpVQlFPM+SZ1O vqNdb/R0w4KUHzTiCMIrfTP+Ln6ibrdWXHvqj7Na7Rqq0HZpx9tjUKCOE7E05udXKKjg SzPA== 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=3UKkrNollMxOCF3COKvL0YNkyQfsg0h7u9ryo5UdsJM=; b=ao0su7mmHhp/d2Lkii/y6WW1VGU3+DfnL4pBct/1+jCTtVwb9pQUm3pY5JBxguPYMi 7HTejQ9v3jD7cT95LT8P8rMKtrYPWhhLSSi6nNkRxSrOgX0HLfASZxxAiiD+s8uWgMG2 IFB1Uwb1cGuMrptQn5RDgjdX6nGl6iVms9Ct1qTUZffkZRm7xnPXSNsczJ6HyXayMVDN xUyiB/6ikZsM2pPjtT4gnl27Yynw5GiWjIsd9shEcUaMAtQGb4tk4C9z0GQ+V8xIqqLU MPLSwkIi8ti03Qav6s8rhB9cK+223KZ1HGV+N8RI2BhMMcHaEMdw22Bgxkdkt4TVwx9x GQYg== X-Gm-Message-State: AGi0PuYoIUVc8bGZOOrdeFXkjQjlSSg4EQbQioa3ccI1k0ZmM0Ey0aeR 3U7cZtDCZQm7BQtJUmjsw3HPE29j X-Google-Smtp-Source: APiQypKBCs6yIIp/grJCk/xAkzu3Ck87CnVtT/iL8Apc+jRpt/VfHbtKZGHQPVlRjlvHKu4GnRswKw== X-Received: by 2002:adf:f08b:: with SMTP id n11mr7049202wro.323.1586573070928; Fri, 10 Apr 2020 19:44:30 -0700 (PDT) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id k14sm5324735wrp.53.2020.04.10.19.44.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Apr 2020 19:44:30 -0700 (PDT) Message-Id: <3a5bedc68d696f19ab8eb40d1af8abd42172219f.1586573068.git.gitgitgadget@gmail.com> In-Reply-To: References: From: "Elijah Newren via GitGitGadget" Date: Sat, 11 Apr 2020 02:44:25 +0000 Subject: [PATCH v3 2/4] rebase: reinstate --no-keep-empty Fcc: Sent Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 To: git@vger.kernel.org Cc: jonathantanmy@google.com, phillip.wood123@gmail.com, Johannes.Schindelin@gmx.de, bturner@atlassian.com, sami@boukortt.com, Elijah Newren , Elijah Newren Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Elijah Newren Commit d48e5e21da ("rebase (interactive-backend): make --keep-empty the default", 2020-02-15) turned --keep-empty (for keeping commits which start empty) into the default. The logic underpinning that commit was: 1) 'git commit' errors out on the creation of empty commits without an override flag 2) Once someone determines that the override is worthwhile, it's annoying and/or harmful to required them to take extra steps in order to keep such commits around (and to repeat such steps with every rebase). While the logic on which the decision was made is sound, the result was a bit of an overcorrection. Instead of jumping to having --keep-empty being the default, it jumped to making --keep-empty the only available behavior. There was a simple workaround, though, which was thought to be good enough at the time. People could still drop commits which started empty the same way the could drop any commits: by firing up an interactive rebase and picking out the commits they didn't want from the list. However, there are cases where external tools might create enough empty commits that picking all of them out is painful. As such, having a flag to automatically remove start-empty commits may be beneficial. Provide users a way to drop commits which start empty using a flag that existed for years: --no-keep-empty. Interpret --keep-empty as countermanding any previous --no-keep-empty, but otherwise leaving --keep-empty as the default. This might lead to some slight weirdness since commands like git rebase --empty=drop --keep-empty git rebase --empty=keep --no-keep-empty look really weird despite making perfect sense (the first will drop commits which become empty, but keep commits that started empty; the second will keep commits which become empty, but drop commits which started empty). However, --no-keep-empty was named years ago and we are predominantly keeping it for backward compatibility; also we suspect it will only be used rarely since folks already have a simple way to drop commits they don't want with an interactive rebase. Reported-by: Bryan Turner Reported-by: Sami Boukortt Signed-off-by: Elijah Newren --- Documentation/git-rebase.txt | 48 ++++++++++++++++++++----------- builtin/rebase.c | 15 ++++++---- sequencer.c | 6 ++++ sequencer.h | 2 +- t/t3421-rebase-topology-linear.sh | 10 +++---- t/t3424-rebase-empty.sh | 36 +++++++++++++++++++++++ 6 files changed, 87 insertions(+), 30 deletions(-) diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt index 8ab0558aca2..18d718ac61d 100644 --- a/Documentation/git-rebase.txt +++ b/Documentation/git-rebase.txt @@ -277,20 +277,32 @@ See also INCOMPATIBLE OPTIONS below. Other options, like --exec, will use the default of drop unless -i/--interactive is explicitly specified. + -Note that commits which start empty are kept, and commits which are -clean cherry-picks (as determined by `git log --cherry-mark ...`) are -always dropped. +Note that commits which start empty are kept (unless --no-keep-empty +is specified), and commits which are clean cherry-picks (as determined +by `git log --cherry-mark ...`) are always dropped. + See also INCOMPATIBLE OPTIONS below. +--no-keep-empty:: --keep-empty:: - No-op. Rebasing commits that started empty (had no change - relative to their parent) used to fail and this option would - override that behavior, allowing commits with empty changes to - be rebased. Now commits with no changes do not cause rebasing - to halt. + Do not keep commits that start empty before the rebase + (i.e. that do not change anything from its parent) in the + result. The default is to keep commits which start empty, + since creating such commits requires passing the --allow-empty + override flag to `git commit`, signifying that a user is very + intentionally creating such a commit and thus wants to keep + it. + -See also BEHAVIORAL DIFFERENCES and INCOMPATIBLE OPTIONS below. +Usage of this flag will probably be rare, since you can get rid of +commits that start empty by just firing up an interactive rebase and +removing the lines corresponding to the commits you don't want. This +flag exists as a convenient shortcut, such as for cases where external +tools generate many empty commits and you want them all removed. ++ +For commits which do not start empty but become empty after rebasing, +see the --empty flag. ++ +See also INCOMPATIBLE OPTIONS below. --allow-empty-message:: No-op. Rebasing commits with an empty message used to fail @@ -587,7 +599,7 @@ are incompatible with the following options: * --preserve-merges * --interactive * --exec - * --keep-empty + * --no-keep-empty * --empty= * --edit-todo * --root when used in combination with --onto @@ -620,13 +632,15 @@ commits that started empty, though these are rare in practice. It also drops commits that become empty and has no option for controlling this behavior. -The merge backend keeps intentionally empty commits (though with -i -they are marked as empty in the todo list editor). Similar to the -apply backend, by default the merge backend drops commits that become -empty unless -i/--interactive is specified (in which case it stops and -asks the user what to do). The merge backend also has an ---empty={drop,keep,ask} option for changing the behavior of handling -commits that become empty. +The merge backend keeps intentionally empty commits by default (though +with -i they are marked as empty in the todo list editor, or they can +be dropped automatically with --no-keep-empty). + +Similar to the apply backend, by default the merge backend drops +commits that become empty unless -i/--interactive is specified (in +which case it stops and asks the user what to do). The merge backend +also has an --empty={drop,keep,ask} option for changing the behavior +of handling commits that become empty. Directory rename detection ~~~~~~~~~~~~~~~~~~~~~~~~~~ diff --git a/builtin/rebase.c b/builtin/rebase.c index bff53d5d167..022aa2589a5 100644 --- a/builtin/rebase.c +++ b/builtin/rebase.c @@ -85,6 +85,7 @@ struct rebase_options { const char *action; int signoff; int allow_rerere_autoupdate; + int keep_empty; int autosquash; char *gpg_sign_opt; int autostash; @@ -100,6 +101,7 @@ struct rebase_options { #define REBASE_OPTIONS_INIT { \ .type = REBASE_UNSPECIFIED, \ .empty = EMPTY_UNSPECIFIED, \ + .keep_empty = 1, \ .default_backend = "merge", \ .flags = REBASE_NO_QUIET, \ .git_am_opts = ARGV_ARRAY_INIT, \ @@ -379,6 +381,7 @@ static int run_sequencer_rebase(struct rebase_options *opts, git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands); + flags |= opts->keep_empty ? TODO_LIST_KEEP_EMPTY : 0; flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0; flags |= opts->rebase_merges ? TODO_LIST_REBASE_MERGES : 0; flags |= opts->rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0; @@ -442,6 +445,7 @@ static int run_sequencer_rebase(struct rebase_options *opts, return ret; } +static void imply_merge(struct rebase_options *opts, const char *option); static int parse_opt_keep_empty(const struct option *opt, const char *arg, int unset) { @@ -449,10 +453,8 @@ static int parse_opt_keep_empty(const struct option *opt, const char *arg, BUG_ON_OPT_ARG(arg); - /* - * If we ever want to remap --keep-empty to --empty=keep, insert: - * opts->empty = unset ? EMPTY_UNSPECIFIED : EMPTY_KEEP; - */ + imply_merge(opts, unset ? "--no-keep-empty" : "--keep-empty"); + opts->keep_empty = !unset; opts->type = REBASE_MERGE; return 0; } @@ -471,7 +473,7 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix) OPT_NEGBIT(0, "ff", &opts.flags, N_("allow fast-forward"), REBASE_FORCE), { OPTION_CALLBACK, 'k', "keep-empty", &options, NULL, - N_("(DEPRECATED) keep empty commits"), + N_("keep commits which start empty"), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, parse_opt_keep_empty }, OPT_BOOL_F(0, "allow-empty-message", &opts.allow_empty_message, @@ -1162,6 +1164,7 @@ static int run_specific_rebase(struct rebase_options *opts, enum action action) opts->allow_rerere_autoupdate ? opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ? "--rerere-autoupdate" : "--no-rerere-autoupdate" : ""); + add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : ""); add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : ""); add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt); add_var(&script_snippet, "cmd", opts->cmd); @@ -1547,7 +1550,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix) N_("how to handle commits that become empty"), PARSE_OPT_NONEG, parse_opt_empty), { OPTION_CALLBACK, 'k', "keep-empty", &options, NULL, - N_("(DEPRECATED) keep empty commits"), + N_("keep commits which start empty"), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, parse_opt_keep_empty }, OPT_BOOL(0, "autosquash", &options.autosquash, diff --git a/sequencer.c b/sequencer.c index ce9fd27a878..d973e19729e 100644 --- a/sequencer.c +++ b/sequencer.c @@ -4591,6 +4591,7 @@ static int make_script_with_merges(struct pretty_print_context *pp, struct rev_info *revs, struct strbuf *out, unsigned flags) { + int keep_empty = flags & TODO_LIST_KEEP_EMPTY; int rebase_cousins = flags & TODO_LIST_REBASE_COUSINS; int root_with_onto = flags & TODO_LIST_ROOT_WITH_ONTO; struct strbuf buf = STRBUF_INIT, oneline = STRBUF_INIT; @@ -4645,6 +4646,8 @@ static int make_script_with_merges(struct pretty_print_context *pp, is_empty = is_original_commit_empty(commit); if (!is_empty && (commit->object.flags & PATCHSAME)) continue; + if (is_empty && !keep_empty) + continue; strbuf_reset(&oneline); pretty_print_commit(pp, commit, &oneline); @@ -4822,6 +4825,7 @@ int sequencer_make_script(struct repository *r, struct strbuf *out, int argc, struct pretty_print_context pp = {0}; struct rev_info revs; struct commit *commit; + int keep_empty = flags & TODO_LIST_KEEP_EMPTY; const char *insn = flags & TODO_LIST_ABBREVIATE_CMDS ? "p" : "pick"; int rebase_merges = flags & TODO_LIST_REBASE_MERGES; @@ -4861,6 +4865,8 @@ int sequencer_make_script(struct repository *r, struct strbuf *out, int argc, if (!is_empty && (commit->object.flags & PATCHSAME)) continue; + if (is_empty && !keep_empty) + continue; strbuf_addf(out, "%s %s ", insn, oid_to_hex(&commit->object.oid)); pretty_print_commit(&pp, commit, out); diff --git a/sequencer.h b/sequencer.h index 718a07426da..7ebaa237340 100644 --- a/sequencer.h +++ b/sequencer.h @@ -134,7 +134,7 @@ int sequencer_rollback(struct repository *repo, struct replay_opts *opts); int sequencer_skip(struct repository *repo, struct replay_opts *opts); int sequencer_remove_state(struct replay_opts *opts); -/* #define TODO_LIST_KEEP_EMPTY (1U << 0) */ /* No longer used */ +#define TODO_LIST_KEEP_EMPTY (1U << 0) #define TODO_LIST_SHORTEN_IDS (1U << 1) #define TODO_LIST_ABBREVIATE_CMDS (1U << 2) #define TODO_LIST_REBASE_MERGES (1U << 3) diff --git a/t/t3421-rebase-topology-linear.sh b/t/t3421-rebase-topology-linear.sh index cf8dfd6c203..4a9204b4b64 100755 --- a/t/t3421-rebase-topology-linear.sh +++ b/t/t3421-rebase-topology-linear.sh @@ -220,14 +220,13 @@ test_have_prereq !REBASE_P || test_run_rebase failure -p test_run_rebase () { result=$1 shift - test_expect_$result "rebase $* --keep-empty" " + test_expect_$result "rebase $* --no-keep-empty drops begin-empty commits" " reset_rebase && - git rebase $* --keep-empty c l && - test_cmp_rev c HEAD~3 && - test_linear_range 'd k l' c.. + git rebase $* --no-keep-empty c l && + test_cmp_rev c HEAD~2 && + test_linear_range 'd l' c.. " } -test_run_rebase success --apply test_run_rebase success -m test_run_rebase success -i test_have_prereq !REBASE_P || test_run_rebase success -p @@ -242,7 +241,6 @@ test_run_rebase () { test_linear_range 'd k l' j.. " } -test_run_rebase success --apply test_run_rebase success -m test_run_rebase success -i test_have_prereq !REBASE_P || test_run_rebase success -p diff --git a/t/t3424-rebase-empty.sh b/t/t3424-rebase-empty.sh index e1e30517ea6..5e1045a0afc 100755 --- a/t/t3424-rebase-empty.sh +++ b/t/t3424-rebase-empty.sh @@ -123,6 +123,42 @@ test_expect_success 'rebase --interactive uses default of --empty=ask' ' test_cmp expect actual ' +test_expect_success 'rebase --merge --empty=drop --keep-empty' ' + git checkout -B testing localmods && + git rebase --merge --empty=drop --keep-empty upstream && + + test_write_lines D C B A >expect && + git log --format=%s >actual && + test_cmp expect actual +' + +test_expect_success 'rebase --merge --empty=drop --no-keep-empty' ' + git checkout -B testing localmods && + git rebase --merge --empty=drop --no-keep-empty upstream && + + test_write_lines C B A >expect && + git log --format=%s >actual && + test_cmp expect actual +' + +test_expect_success 'rebase --merge --empty=keep --keep-empty' ' + git checkout -B testing localmods && + git rebase --merge --empty=keep --keep-empty upstream && + + test_write_lines D C2 C B A >expect && + git log --format=%s >actual && + test_cmp expect actual +' + +test_expect_success 'rebase --merge --empty=keep --no-keep-empty' ' + git checkout -B testing localmods && + git rebase --merge --empty=keep --no-keep-empty upstream && + + test_write_lines C2 C B A >expect && + git log --format=%s >actual && + test_cmp expect actual +' + test_expect_success 'rebase --merge does not leave state laying around' ' git checkout -B testing localmods~2 && git rebase --merge upstream && -- gitgitgadget