From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-4.1 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD shortcircuit=no autolearn=ham autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 43411202F8 for ; Thu, 9 Mar 2017 22:16:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753732AbdCIWQQ (ORCPT ); Thu, 9 Mar 2017 17:16:16 -0500 Received: from mail-pf0-f176.google.com ([209.85.192.176]:33520 "EHLO mail-pf0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753674AbdCIWQM (ORCPT ); Thu, 9 Mar 2017 17:16:12 -0500 Received: by mail-pf0-f176.google.com with SMTP id w189so33708898pfb.0 for ; Thu, 09 Mar 2017 14:16:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=KOLXMH7mvI1dFjCKj9d/u6bUHErWFIGorMu9qwA+65M=; b=oTdgXEXItwCYQYy/8fx1c7R9Kl063B7cGrFEPkgUBG6DWR7Vu6vR4pXHS+lEuUped6 cqJ4RM0LLXElywb1HoyLTVnoDjZF9hRQqoTzssJ3JoMXDHlCx40Xy17RB2iM7fG8g01s Tis/IPJboywUYfrCijvuqaefGtQicFmO+m8P24ejRSYTp3sDlyPvbYWB5Qp4ac1WZbuf hwPF9kog4f+SB5FnE+Mu0TtB/Rw7yNfAsKSMGso9SSZgLysfKXm6ylTtUo7hi9fN8PsY LhLL1GAOqn7JPzOO9fa3EUWxhjwtauUBcid3r+luOgPVlN54VfOhLlUbKPSvty1piA8W rjFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=KOLXMH7mvI1dFjCKj9d/u6bUHErWFIGorMu9qwA+65M=; b=m8sIjzeui1ARpEdGWNErum6Dlgg4FMD90mKGB63jn01P31n3cz2lhbUxsAaQgHBjHO KGNtPz0m6KDQ1OYBnmT6XhFpdX0DhJuQg0bWNksh+xZTeQRJG0Lmz93OsrHVU/0p6n/K zy6C/yERRhO1tLEKRSqAcoM6lJpx89By2uaqt7HW+4NpOPDiqwIoE4Rji9IE3HT9lZiK Duv9ekTPUzSHwb751lE+38Cp9l8ZlbBjKV2Sv3NHMq5Uh2P9NNynDpPp1SRUB0a0OYLk 1Qivlq7FCJ3l3LkTenrLRUrPJCR+Y1gnCs2llXVwG9+LuPWf9gsKYczxK8hOn+kw/Nya VCbw== X-Gm-Message-State: AMke39nJF43Jx/fpLFPd4sIR3FDAeipZ/laniW7/LRD4KVriNdEcIyNaO2CBomv1wcXz4vPZ X-Received: by 10.98.196.221 with SMTP id h90mr16760254pfk.149.1489097770747; Thu, 09 Mar 2017 14:16:10 -0800 (PST) Received: from localhost ([2620:0:1000:5b10:7494:19e8:830b:a2d7]) by smtp.gmail.com with ESMTPSA id m67sm14366297pfj.32.2017.03.09.14.16.10 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 09 Mar 2017 14:16:10 -0800 (PST) From: Stefan Beller To: sbeller@google.com, gitster@pobox.com Cc: git@vger.kernel.org, bmwill@google.com, novalis@novalis.org, sandals@crustytoothpaste.net, hvoigt@hvoigt.net, jrnieder@gmail.com, ramsay@ramsayjones.plus.com Subject: [PATCH 12/17] update submodules: add submodule_move_head Date: Thu, 9 Mar 2017 14:15:38 -0800 Message-Id: <20170309221543.15897-13-sbeller@google.com> X-Mailer: git-send-email 2.12.0.rc1.45.gf291f29c2e In-Reply-To: <20170309221543.15897-1-sbeller@google.com> References: <20170306205919.9713-1-sbeller@google.com> <20170309221543.15897-1-sbeller@google.com> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org In later patches we introduce the options and flag for commands that modify the working directory, e.g. git-checkout. This piece of code will be used universally for all these working tree modifications as it * supports dry run to answer the question: "Is it safe to change the submodule to this new state?" e.g. is it overwriting untracked files or are there local changes that would be overwritten? * supports a force flag that can be used for resetting the tree. Signed-off-by: Stefan Beller --- submodule.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ submodule.h | 7 ++++ 2 files changed, 142 insertions(+) diff --git a/submodule.c b/submodule.c index 0b2596e88a..bc5fecf8c5 100644 --- a/submodule.c +++ b/submodule.c @@ -1239,6 +1239,141 @@ int bad_to_remove_submodule(const char *path, unsigned flags) return ret; } +static int submodule_has_dirty_index(const struct submodule *sub) +{ + struct child_process cp = CHILD_PROCESS_INIT; + + prepare_submodule_repo_env_no_git_dir(&cp.env_array); + + cp.git_cmd = 1; + argv_array_pushl(&cp.args, "diff-index", "--quiet", \ + "--cached", "HEAD", NULL); + cp.no_stdin = 1; + cp.no_stdout = 1; + cp.dir = sub->path; + if (start_command(&cp)) + die("could not recurse into submodule '%s'", sub->path); + + return finish_command(&cp); +} + +static void submodule_reset_index(const char *path) +{ + struct child_process cp = CHILD_PROCESS_INIT; + prepare_submodule_repo_env_no_git_dir(&cp.env_array); + + cp.git_cmd = 1; + cp.no_stdin = 1; + cp.dir = path; + + argv_array_pushf(&cp.args, "--super-prefix=%s/", path); + argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL); + + argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX); + + if (run_command(&cp)) + die("could not reset submodule index"); +} + +/** + * Moves a submodule at a given path from a given head to another new head. + * For edge cases (a submodule coming into existence or removing a submodule) + * pass NULL for old or new respectively. + */ +int submodule_move_head(const char *path, + const char *old, + const char *new, + unsigned flags) +{ + int ret = 0; + struct child_process cp = CHILD_PROCESS_INIT; + const struct submodule *sub; + + sub = submodule_from_path(null_sha1, path); + + if (!sub) + die("BUG: could not get submodule information for '%s'", path); + + if (old && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) { + /* Check if the submodule has a dirty index. */ + if (submodule_has_dirty_index(sub)) + return error(_("submodule '%s' has dirty index"), path); + } + + if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) { + if (old) { + if (!submodule_uses_gitfile(path)) + absorb_git_dir_into_superproject("", path, + ABSORB_GITDIR_RECURSE_SUBMODULES); + } else { + struct strbuf sb = STRBUF_INIT; + strbuf_addf(&sb, "%s/modules/%s", + get_git_common_dir(), sub->name); + connect_work_tree_and_git_dir(path, sb.buf); + strbuf_release(&sb); + + /* make sure the index is clean as well */ + submodule_reset_index(path); + } + } + + prepare_submodule_repo_env_no_git_dir(&cp.env_array); + + cp.git_cmd = 1; + cp.no_stdin = 1; + cp.dir = path; + + argv_array_pushf(&cp.args, "--super-prefix=%s/", path); + argv_array_pushl(&cp.args, "read-tree", NULL); + + if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN) + argv_array_push(&cp.args, "-n"); + else + argv_array_push(&cp.args, "-u"); + + if (flags & SUBMODULE_MOVE_HEAD_FORCE) + argv_array_push(&cp.args, "--reset"); + else + argv_array_push(&cp.args, "-m"); + + argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX); + argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX); + + if (run_command(&cp)) { + ret = -1; + goto out; + } + + if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) { + if (new) { + struct child_process cp1 = CHILD_PROCESS_INIT; + /* also set the HEAD accordingly */ + cp1.git_cmd = 1; + cp1.no_stdin = 1; + cp1.dir = path; + + argv_array_pushl(&cp1.args, "update-ref", "HEAD", + new ? new : EMPTY_TREE_SHA1_HEX, NULL); + + if (run_command(&cp1)) { + ret = -1; + goto out; + } + } else { + struct strbuf sb = STRBUF_INIT; + + strbuf_addf(&sb, "%s/.git", path); + unlink_or_warn(sb.buf); + strbuf_release(&sb); + + if (is_empty_dir(path)) + rmdir_or_warn(path); + } + } +out: + return ret; +} + static int find_first_merges(struct object_array *result, const char *path, struct commit *a, struct commit *b) { diff --git a/submodule.h b/submodule.h index 6f3fe85c7c..4cdf6445f7 100644 --- a/submodule.h +++ b/submodule.h @@ -96,6 +96,13 @@ extern int push_unpushed_submodules(struct sha1_array *commits, extern void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir); extern int parallel_submodules(void); +#define SUBMODULE_MOVE_HEAD_DRY_RUN (1<<0) +#define SUBMODULE_MOVE_HEAD_FORCE (1<<1) +extern int submodule_move_head(const char *path, + const char *old, + const char *new, + unsigned flags); + /* * Prepare the "env_array" parameter of a "struct child_process" for executing * a submodule by clearing any repo-specific envirionment variables, but -- 2.12.0.rc1.45.g207f5fbb2b