From patchwork Sat Oct 8 04:34:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Junio C Hamano X-Patchwork-Id: 13001594 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2AA65C433F5 for ; Sat, 8 Oct 2022 04:34:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229547AbiJHEeo (ORCPT ); Sat, 8 Oct 2022 00:34:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229543AbiJHEem (ORCPT ); Sat, 8 Oct 2022 00:34:42 -0400 Received: from pb-smtp21.pobox.com (pb-smtp21.pobox.com [173.228.157.53]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8EF60DEEA for ; Fri, 7 Oct 2022 21:34:40 -0700 (PDT) Received: from pb-smtp21.pobox.com (unknown [127.0.0.1]) by pb-smtp21.pobox.com (Postfix) with ESMTP id 1B8AF1A967B; Sat, 8 Oct 2022 00:34:40 -0400 (EDT) (envelope-from junio@pobox.com) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=pobox.com; h=from:to:cc :subject:references:date:in-reply-to:message-id:mime-version :content-type; s=sasl; bh=2xUIIr6wcoy0XH79XRXJFNUrPiEi/L5E8Tp8rq dTgow=; b=tDF/mRcoITJEnbMSKNnBNwlnZ0qoqxv9JMVvuOySW2i634SBmnAWKi erwUsMTdIMtXtVIRLhTJGfyDpAIpHAGsRXiyWTiIOfr6Cs6yZM+LojMZZanoyhNF dLrZh1oHYAuCQsS7vwScPPrvjQOd+5PzH19fp0BW//OEmpXlxEZUg= Received: from pb-smtp21.sea.icgroup.com (unknown [127.0.0.1]) by pb-smtp21.pobox.com (Postfix) with ESMTP id B937D1A967A; Sat, 8 Oct 2022 00:34:39 -0400 (EDT) (envelope-from junio@pobox.com) Received: from pobox.com (unknown [34.83.5.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by pb-smtp21.pobox.com (Postfix) with ESMTPSA id E10151A9677; Sat, 8 Oct 2022 00:34:36 -0400 (EDT) (envelope-from junio@pobox.com) From: Junio C Hamano To: git@vger.kernel.org Cc: Eric Sunshine Subject: [PATCH v2] symbolic-ref: teach "--[no-]recurse" option References: Date: Fri, 07 Oct 2022 21:34:35 -0700 In-Reply-To: (Junio C. Hamano's message of "Fri, 07 Oct 2022 15:00:39 -0700") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux) MIME-Version: 1.0 X-Pobox-Relay-ID: 83EDDAAC-46C2-11ED-A08C-B31D44D1D7AA-77302942!pb-smtp21.pobox.com Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Suppose you are managing many maintenance tracks in your project, and some of the more recent ones are maint-2.36 and maint-2.37. Further imagine that your project recently tagged the official 2.38 release, which means you would need to start maint-2.38 track soon, by doing: $ git checkout -b maint-2.38 v2.38.0^0 $ git branch --list 'maint-2.3[6-9]' * maint-2.38 maint-2.36 maint-2.37 So far, so good. But it also is reasonable to want not to have to worry about which maintenance track is the latest, by pointing a more generic-sounding 'maint' branch at it, by doing: $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38 which would allow you to say "whichever it is, check out the latest maintenance track", by doing: $ git checkout maint $ git branch --show-current maint-2.38 It is arguably better to say that we are on 'maint-2.38' rather than on 'maint', and "git merge/pull" would record "into maint-2.38" and not "into maint", so I think what we have is a good behaviour. One thing that is slightly irritating, however, is that I do not think there is a good way (other than "cat .git/HEAD") to learn that you checked out 'maint' to get into that state. Just like the output of "git branch --show-current" shows above, "git symbolic-ref HEAD" would report 'refs/heads/maint-2.38', bypassing the intermediate symbolic ref at 'refs/heads/maint' that is pointed at by HEAD. The internal resolve_ref() API already has the necessary support for stopping after resolving a single level of a symbolic-ref, and we can expose it by adding a "--[no-]recurse" option to the command. Signed-off-by: Junio C Hamano --- * Updates documentation, which was entirely lacking in v1, with no other changes. Documentation/git-symbolic-ref.txt | 9 +++++++++ builtin/symbolic-ref.c | 16 ++++++++++------ t/t1401-symbolic-ref.sh | 14 ++++++++++++++ 3 files changed, 33 insertions(+), 6 deletions(-) diff --git a/Documentation/git-symbolic-ref.txt b/Documentation/git-symbolic-ref.txt index ef68ad2b71..3b5a97ea2b 100644 --- a/Documentation/git-symbolic-ref.txt +++ b/Documentation/git-symbolic-ref.txt @@ -46,6 +46,15 @@ OPTIONS When showing the value of as a symbolic ref, try to shorten the value, e.g. from `refs/heads/master` to `master`. +--recurse:: +--no-recurse:: + When showing the value of as a symbolic ref, if + refers to another symbolic ref, follow such a chain + of symbolic refs until the result no longer points at a + symbolic ref (`--recurse`, which is the default). + `--no-recurse` stops after dereferencing only a single level + of symbolic ref. + -m:: Update the reflog for with . This is valid only when creating or updating a symbolic ref. diff --git a/builtin/symbolic-ref.c b/builtin/symbolic-ref.c index e547a08d6c..1af27b3a68 100644 --- a/builtin/symbolic-ref.c +++ b/builtin/symbolic-ref.c @@ -10,10 +10,13 @@ static const char * const git_symbolic_ref_usage[] = { NULL }; -static int check_symref(const char *HEAD, int quiet, int shorten, int print) +static int check_symref(const char *HEAD, int quiet, int shorten, int recurse, int print) { - int flag; - const char *refname = resolve_ref_unsafe(HEAD, 0, NULL, &flag); + int resolve_flags, flag; + const char *refname; + + resolve_flags = (recurse ? 0 : RESOLVE_REF_NO_RECURSE); + refname = resolve_ref_unsafe(HEAD, resolve_flags, NULL, &flag); if (!refname) die("No such ref: %s", HEAD); @@ -35,13 +38,14 @@ static int check_symref(const char *HEAD, int quiet, int shorten, int print) int cmd_symbolic_ref(int argc, const char **argv, const char *prefix) { - int quiet = 0, delete = 0, shorten = 0, ret = 0; + int quiet = 0, delete = 0, shorten = 0, recurse = 1, ret = 0; const char *msg = NULL; struct option options[] = { OPT__QUIET(&quiet, N_("suppress error message for non-symbolic (detached) refs")), OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")), OPT_BOOL(0, "short", &shorten, N_("shorten ref output")), + OPT_BOOL(0, "recurse", &recurse, N_("recursively dereference (default)")), OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")), OPT_END(), }; @@ -55,7 +59,7 @@ int cmd_symbolic_ref(int argc, const char **argv, const char *prefix) if (delete) { if (argc != 1) usage_with_options(git_symbolic_ref_usage, options); - ret = check_symref(argv[0], 1, 0, 0); + ret = check_symref(argv[0], 1, 0, 0, 0); if (ret) die("Cannot delete %s, not a symbolic ref", argv[0]); if (!strcmp(argv[0], "HEAD")) @@ -65,7 +69,7 @@ int cmd_symbolic_ref(int argc, const char **argv, const char *prefix) switch (argc) { case 1: - ret = check_symref(argv[0], quiet, shorten, 1); + ret = check_symref(argv[0], quiet, shorten, recurse, 1); break; case 2: if (!strcmp(argv[0], "HEAD") && diff --git a/t/t1401-symbolic-ref.sh b/t/t1401-symbolic-ref.sh index 132a1b885a..773a6e8e01 100755 --- a/t/t1401-symbolic-ref.sh +++ b/t/t1401-symbolic-ref.sh @@ -163,4 +163,18 @@ test_expect_success 'symbolic-ref can resolve d/f name (ENOTDIR)' ' test_cmp expect actual ' +test_expect_success 'symbolic-ref pointing at another' ' + git update-ref refs/heads/maint-2.37 HEAD && + git symbolic-ref refs/heads/maint refs/heads/maint-2.37 && + git checkout maint && + + git symbolic-ref HEAD >actual && + echo refs/heads/maint-2.37 >expect && + test_cmp expect actual && + + git symbolic-ref --no-recurse HEAD >actual && + echo refs/heads/maint >expect && + test_cmp expect actual +' + test_done