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=-5.0 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM,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 8F89E20229 for ; Thu, 10 Nov 2016 20:35:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965206AbcKJUfA (ORCPT ); Thu, 10 Nov 2016 15:35:00 -0500 Received: from mail-pf0-f173.google.com ([209.85.192.173]:33972 "EHLO mail-pf0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936180AbcKJUeu (ORCPT ); Thu, 10 Nov 2016 15:34:50 -0500 Received: by mail-pf0-f173.google.com with SMTP id n85so151863857pfi.1 for ; Thu, 10 Nov 2016 12:34:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=OBnjkd/u8av9LTzWJEKO82NNWTDYfJQRMEofx4hEM5s=; b=X/isaKHFERQnAK3jr53MaBZ/Hd/D8RtNw0frt2Pbav0CF9QGnGpzsMtNq+cY9Ef66+ Tsm+3rh+U2zmoVKuwPYkyj5Cw5Vx2adkNtBXXcd73sFGlCCSUdLh8RZme19lWK+/Wt42 gF3eK1XEKRdR7IC9K+lB4Vrqgff+6LqJD9pGvqSq+XLqkeb8VziUg1gf0Bi2uCccAE57 va+hAADxHKPl3FUicZ/A/eFslFVkuh9/3mmxhvxP28kfVoHts16CAhqu779mS/xzhmHU WE5qg7GQBwIIjmpBrFdq3YTRPxGb8achS+2bLQowwb3tUxnYLaYvUD+9LXi7gbAY5frp RKKQ== 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=OBnjkd/u8av9LTzWJEKO82NNWTDYfJQRMEofx4hEM5s=; b=WaGv6+/DNv0sQffHoX40C5m+UEJJ4O4RyjExJ0fL8QmQHXSMhz3Lk3y2P7uqBjFE7f OBaQ6SQwqSstmUpiKVJAlwDnAzkL7gy16zN0ojr8xX+ZDGHMuIw/Jx/B9vjDIeOPhZPs +EHT9vC6UrIAiFEbC1SI8rEkIDkTdMUOMxRkSgWAajwrgWMT8pqSKzCA8bzyCgQDFnj6 6wSjvVvhXX+EBboKNkBEdwfUx/ytgN9gmqYRzsAmRs101+TCko2KRbBxPowKl+iUOTAN kjl5o6XC2a8P2OS1JqLh8D0nwOUN9M3JiTF/kpVB1bE19mQcZLlsuAYXPS5Fsmia3z7p cS1w== X-Gm-Message-State: ABUngvflz3y8GYGVdVOR3meo/az4Wk6lZkQkJMswTkOS7v8coEuwdGXg2aG9dCczvZ2Se7cS X-Received: by 10.99.108.8 with SMTP id h8mr17667765pgc.93.1478810089150; Thu, 10 Nov 2016 12:34:49 -0800 (PST) Received: from localhost ([2620:0:1000:5b00:b504:dcf8:965a:7ab8]) by smtp.gmail.com with ESMTPSA id v82sm6292805pfi.6.2016.11.10.12.34.48 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 10 Nov 2016 12:34:48 -0800 (PST) From: Stefan Beller To: gitster@pobox.com, bmwill@google.com, pclouds@gmail.com Cc: git@vger.kernel.org, Stefan Beller Subject: [PATCH 11/35] attr: (re)introduce git_check_attr() and struct git_attr_check Date: Thu, 10 Nov 2016 12:34:04 -0800 Message-Id: <20161110203428.30512-12-sbeller@google.com> X-Mailer: git-send-email 2.10.1.469.g00a8914 In-Reply-To: <20161110203428.30512-1-sbeller@google.com> References: <20161110203428.30512-1-sbeller@google.com> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Junio C Hamano A common pattern to check N attributes for many paths is to (1) prepare an array A of N git_attr_check_elem items; (2) call git_attr() to intern the N attribute names and fill A; (3) repeatedly call git_check_attrs() for path with N and A; A look-up for these N attributes for a single path P scans the entire attr_stack, starting from the .git/info/attributes file and then .gitattributes file in the directory the path P is in, going upwards to find .gitattributes file found in parent directories. An earlier commit 06a604e6 (attr: avoid heavy work when we know the specified attr is not defined, 2014-12-28) tried to optimize out this scanning for one trivial special case: when the attribute being sought is known not to exist, we do not have to scan for it. While this may be a cheap and effective heuristic, it would not work well when N is (much) more than 1. What we would want is a more customized way to skip irrelevant entries in the attribute stack, and the definition of irrelevance is tied to the set of attributes passed to git_check_attrs() call, i.e. the set of attributes being sought. The data necessary for this optimization needs to live alongside the set of attributes, but a simple array of git_attr_check_elem simply does not have any place for that. Introduce "struct git_attr_check" that contains N, the number of attributes being sought, and A, the array that holds N git_attr_check_elem items, and a function git_check_attr() that takes a path P and this structure as its parameters. This structure can later be extended to hold extra data necessary for optimization. Also, to make it easier to write the first two steps in common cases, introduce git_attr_check_initl() helper function, which takes a NULL-terminated list of attribute names and initialize this structure. As an illustration of this new API, convert archive.c that asks for export-subst and export-ignore attributes for each paths. Signed-off-by: Junio C Hamano Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano --- archive.c | 24 ++++++------------------ attr.c | 34 ++++++++++++++++++++++++++++++++++ attr.h | 9 +++++++++ 3 files changed, 49 insertions(+), 18 deletions(-) diff --git a/archive.c b/archive.c index 2dc8d6c..11e3951 100644 --- a/archive.c +++ b/archive.c @@ -87,19 +87,6 @@ void *sha1_file_to_archive(const struct archiver_args *args, return buffer; } -static void setup_archive_check(struct git_attr_check_elem *check) -{ - static struct git_attr *attr_export_ignore; - static struct git_attr *attr_export_subst; - - if (!attr_export_ignore) { - attr_export_ignore = git_attr("export-ignore"); - attr_export_subst = git_attr("export-subst"); - } - check[0].attr = attr_export_ignore; - check[1].attr = attr_export_subst; -} - struct directory { struct directory *up; struct object_id oid; @@ -123,7 +110,7 @@ static int write_archive_entry(const unsigned char *sha1, const char *base, struct archiver_context *c = context; struct archiver_args *args = c->args; write_archive_entry_fn_t write_entry = c->write_entry; - struct git_attr_check_elem check[2]; + static struct git_attr_check *check; const char *path_without_prefix; int err; @@ -137,11 +124,12 @@ static int write_archive_entry(const unsigned char *sha1, const char *base, strbuf_addch(&path, '/'); path_without_prefix = path.buf + args->baselen; - setup_archive_check(check); - if (!git_check_attrs(path_without_prefix, ARRAY_SIZE(check), check)) { - if (ATTR_TRUE(check[0].value)) + if (!check) + check = git_attr_check_initl("export-ignore", "export-subst", NULL); + if (!git_check_attr(path_without_prefix, check)) { + if (ATTR_TRUE(check->check[0].value)) return 0; - args->convert = ATTR_TRUE(check[1].value); + args->convert = ATTR_TRUE(check->check[1].value); } if (S_ISDIR(mode) || S_ISGITLINK(mode)) { diff --git a/attr.c b/attr.c index c99e23a..861e1a2 100644 --- a/attr.c +++ b/attr.c @@ -829,3 +829,37 @@ void git_attr_set_direction(enum git_attr_direction new, struct index_state *ist drop_attr_stack(); use_index = istate; } + +int git_check_attr(const char *path, struct git_attr_check *check) +{ + return git_check_attrs(path, check->check_nr, check->check); +} + +struct git_attr_check *git_attr_check_initl(const char *one, ...) +{ + struct git_attr_check *check; + int cnt; + va_list params; + const char *param; + + va_start(params, one); + for (cnt = 1; (param = va_arg(params, const char *)) != NULL; cnt++) + ; + va_end(params); + check = xcalloc(1, + sizeof(*check) + cnt * sizeof(*(check->check))); + check->check_nr = cnt; + check->check = (struct git_attr_check_elem *)(check + 1); + + check->check[0].attr = git_attr(one); + va_start(params, one); + for (cnt = 1; cnt < check->check_nr; cnt++) { + param = va_arg(params, const char *); + if (!param) + die("BUG: counted %d != ended at %d", + check->check_nr, cnt); + check->check[cnt].attr = git_attr(param); + } + va_end(params); + return check; +} diff --git a/attr.h b/attr.h index dd3c4a3..3fd8690 100644 --- a/attr.h +++ b/attr.h @@ -29,6 +29,15 @@ struct git_attr_check_elem { const char *value; }; +struct git_attr_check { + int check_nr; + int check_alloc; + struct git_attr_check_elem *check; +}; + +extern struct git_attr_check *git_attr_check_initl(const char *, ...); +extern int git_check_attr(const char *path, struct git_attr_check *); + /* * Return the name of the attribute represented by the argument. The * return value is a pointer to a null-delimited string that is part -- 2.10.1.469.g00a8914