From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Nieder Subject: [PATCH 14/20] walker.c: use ref transaction for ref updates Date: Tue, 26 Aug 2014 17:34:24 -0700 Message-ID: <20140827003424.GO20185@google.com> References: <20140820231723.GF20185@google.com> <20140826000354.GW20185@google.com> <20140826221448.GY20185@google.com> <20140827002804.GA20185@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Ronnie Sahlberg , "git@vger.kernel.org" , Michael Haggerty To: Junio C Hamano X-From: git-owner@vger.kernel.org Wed Aug 27 02:34:44 2014 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 1XMRCE-0007F3-7w for gcvg-git-2@plane.gmane.org; Wed, 27 Aug 2014 02:34:42 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756444AbaH0Aeb (ORCPT ); Tue, 26 Aug 2014 20:34:31 -0400 Received: from mail-pd0-f172.google.com ([209.85.192.172]:35997 "EHLO mail-pd0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756418AbaH0Ae2 (ORCPT ); Tue, 26 Aug 2014 20:34:28 -0400 Received: by mail-pd0-f172.google.com with SMTP id y13so23206050pdi.31 for ; Tue, 26 Aug 2014 17:34:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=dhiWqJgLc7CP026qXRX823ZedZMYrrvsFdd60ukfqFY=; b=AgzBo6oDqXJ0Kq6OBGI/JK7YBes4B9ndbwndMpNACP3i7a3v4KaW1crFSDOWXfC6Rk TX/j1MVMCnRorPFeKFlB9DAmMxacVmp1rHdH2rmYF4PxxF+9f/Gyj7Ecnp5IrB2a92Qf MbNeuxsXfop1rbf1gpOgX5pN6CcIXyW7DOiz+LwKh1jQSkMEnZBxp7Wx+r1jTsv8Tee0 TBIm8y+KWKYlY+8mrfC7QgCTs385xReqvkO0a3jRmW3RgPOXbRg9NmIfSnBsyF0Ko+ZG YBpFDdv9vf81FJqcJko79JPl84JgNxe7l3RkeRmVGN1IwojeEkAHFW9tYWr9Dyx0qNdc Dx2g== X-Received: by 10.66.190.169 with SMTP id gr9mr16754434pac.3.1409099668170; Tue, 26 Aug 2014 17:34:28 -0700 (PDT) Received: from google.com ([2620:0:1000:5b00:4ba:9bd4:148:77e4]) by mx.google.com with ESMTPSA id y4sm6975648pdm.1.2014.08.26.17.34.25 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 26 Aug 2014 17:34:26 -0700 (PDT) Content-Disposition: inline In-Reply-To: <20140827002804.GA20185@google.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: From: Ronnie Sahlberg Date: Thu, 17 Apr 2014 11:31:06 -0700 Switch to using ref transactions in walker_fetch(). As part of the refactoring to use ref transactions we also fix a potential memory leak where in the original code if write_ref_sha1() would fail we would end up returning from the function without free()ing the msg string. Note that this function is only called when fetching from a remote HTTP repository onto the local (most of the time single-user) repository which likely means that the type of collisions that the previous locking would protect against and cause the fetch to fail for are even more rare. Signed-off-by: Ronnie Sahlberg Signed-off-by: Jonathan Nieder --- walker.c | 72 ++++++++++++++++++++++++++++++++++++---------------------------- 1 file changed, 41 insertions(+), 31 deletions(-) diff --git a/walker.c b/walker.c index 1dd86b8..b8a5441 100644 --- a/walker.c +++ b/walker.c @@ -251,40 +251,40 @@ void walker_targets_free(int targets, char **target, const char **write_ref) int walker_fetch(struct walker *walker, int targets, char **target, const char **write_ref, const char *write_ref_log_details) { - struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *)); + struct strbuf refname = STRBUF_INIT; + struct strbuf err = STRBUF_INIT; + struct ref_transaction *transaction = NULL; unsigned char *sha1 = xmalloc(targets * 20); - char *msg; - int ret; - int i; + char *msg = NULL; + int i, ret = -1; save_commit_buffer = 0; - for (i = 0; i < targets; i++) { - if (!write_ref || !write_ref[i]) - continue; - - lock[i] = lock_ref_sha1(write_ref[i], NULL); - if (!lock[i]) { - error("Can't lock ref %s", write_ref[i]); - goto unlock_and_fail; + if (write_ref) { + transaction = ref_transaction_begin(&err); + if (!transaction) { + error("%s", err.buf); + goto done; } } - if (!walker->get_recover) for_each_ref(mark_complete, NULL); for (i = 0; i < targets; i++) { if (interpret_target(walker, target[i], &sha1[20 * i])) { error("Could not interpret response from server '%s' as something to pull", target[i]); - goto unlock_and_fail; + goto done; } if (process(walker, lookup_unknown_object(&sha1[20 * i]))) - goto unlock_and_fail; + goto done; } if (loop(walker)) - goto unlock_and_fail; - + goto done; + if (!write_ref) { + ret = 0; + goto done; + } if (write_ref_log_details) { msg = xmalloc(strlen(write_ref_log_details) + 12); sprintf(msg, "fetch from %s", write_ref_log_details); @@ -292,23 +292,33 @@ int walker_fetch(struct walker *walker, int targets, char **target, msg = NULL; } for (i = 0; i < targets; i++) { - if (!write_ref || !write_ref[i]) + if (!write_ref[i]) continue; - ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)"); - lock[i] = NULL; - if (ret) - goto unlock_and_fail; + strbuf_reset(&refname); + strbuf_addf(&refname, "refs/%s", write_ref[i]); + if (ref_transaction_update(transaction, refname.buf, + &sha1[20 * i], NULL, 0, 0, + &err)) { + error("%s", err.buf); + goto done; + } } + if (ref_transaction_commit(transaction, + msg ? msg : "fetch (unknown)", + &err)) { + error("%s", err.buf); + goto done; + } + + ret = 0; + +done: + ref_transaction_free(transaction); free(msg); - - return 0; - -unlock_and_fail: - for (i = 0; i < targets; i++) - if (lock[i]) - unlock_ref(lock[i]); - - return -1; + free(sha1); + strbuf_release(&err); + strbuf_release(&refname); + return ret; } void walker_free(struct walker *walker) -- 2.1.0.rc2.206.gedb03e5