From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Beller Subject: [PATCH v4 2/7] send-pack.c: add an --atomic-push command line argument Date: Mon, 17 Nov 2014 18:00:35 -0800 Message-ID: <1416276040-5303-3-git-send-email-sbeller@google.com> References: <1416276040-5303-1-git-send-email-sbeller@google.com> Cc: Ronnie Sahlberg , Stefan Beller To: git@vger.kernel.org, gitster@pobox.com, mhagger@alum.mit.edu X-From: git-owner@vger.kernel.org Tue Nov 18 03:01:05 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 1XqY6K-0000v6-P1 for gcvg-git-2@plane.gmane.org; Tue, 18 Nov 2014 03:01:05 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753665AbaKRCAs (ORCPT ); Mon, 17 Nov 2014 21:00:48 -0500 Received: from mail-ig0-f177.google.com ([209.85.213.177]:60174 "EHLO mail-ig0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753649AbaKRCAq (ORCPT ); Mon, 17 Nov 2014 21:00:46 -0500 Received: by mail-ig0-f177.google.com with SMTP id uq10so5028282igb.4 for ; Mon, 17 Nov 2014 18:00:46 -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=KJvXrf7kctPbrV7CvyirjCyq1OtvofJd/tYoLQT0t2w=; b=bwqMUYL8jTUKwN7hmEluofa1NUYbcaxD3wdgfSX7mgz+4Yu3EyfB7/BwPCXUce+HRw WMuFDGGxcVCwLDHJ7aY3LWFOW+C9CIU7HpOSsPuwpwih+XtWh8r1VqNzlNh66JP+7k4x 7iZufU7+EK9VWZa+7HJPmJTozZUNBHeUqdbTSgLYRrRI4rQwKgr48yfOMdV0OslDe9nA FWqSR/ex6LISD46Yrgr5LqLl6KwzGgaLsTZrfLdhdYmt774e/qO6yp/4ZNjjW5lHFFbC NMq1gC7heYkKwQVKja4ALt2xlA7sHcWnZFhhgQz4NCQ5JZl8wDScapmIgjo52rM++M3P R+Kg== 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=KJvXrf7kctPbrV7CvyirjCyq1OtvofJd/tYoLQT0t2w=; b=CJAp6ctCVviLty9owuMMlxL3K5baBh4AFmfO5OGQIeJxtMu3ak53Wf4O57F7fu8+fs sm3vszEQWNjYUzjw1jQ+TX4njE+RUyMK4vdfdy4zBG4DOw3OB6ONgv9bvguzM4uL08uZ EmNfIgV31KUPrm4PpsYaQWxP3GJfIV7EJVlSW3jl21EPN1NKqKVrjkR5A6doNkZ41LdW bBTe9uJPP625AAftdCAsh2in8aZ4EaPP7J9ZxvCG3tR+eF4yCbrtqNhqFfAhzVjYsNXV fPuFwbBluc7EnQuOGx6w4sl3aDjaIP8TPBESSnpFf0Swmk4Y9+t+x47C3LBaU4yl5uS/ f7nw== X-Gm-Message-State: ALoCoQnlFzf83nkhFj/0gCbUvf5qejlxL9zxCyj/JYLED67C7q7JInVDNQmhfaSOz0SpAgxHfC3m X-Received: by 10.42.128.81 with SMTP id l17mr31490883ics.8.1416276046055; Mon, 17 Nov 2014 18:00:46 -0800 (PST) Received: from localhost ([2620:0:1000:5b00:c9d9:b6de:cff4:3fc7]) by mx.google.com with ESMTPSA id l62sm19807818ioe.42.2014.11.17.18.00.45 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Mon, 17 Nov 2014 18:00:45 -0800 (PST) X-Mailer: git-send-email 2.2.0.rc2.5.gf7b9fb2 In-Reply-To: <1416276040-5303-1-git-send-email-sbeller@google.com> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Ronnie Sahlberg This adds support to send-pack to negotiate and use atomic pushes iff the server supports it. Atomic pushes are activated by a new command line flag --atomic-push. In order to do this we also need to change the semantics for send_pack() slightly. The existing send_pack() function actually doesn't send all the refs back to the server when multiple refs are involved, for example when using --all. Several of the failure modes for pushes can already be detected locally in the send_pack client based on the information from the initial server side list of all the refs as generated by receive-pack. Any such refs that we thus know would fail to push are thus pruned from the list of refs we send to the server to update. For atomic pushes, we have to deal thus with both failures that are detected locally as well as failures that are reported back from the server. In order to do so we treat all local failures as push failures too. We introduce a new status code REF_STATUS_ATOMIC_PUSH_FAILED so we can flag all refs that we would normally have tried to push to the server but we did not due to local failures. This is to improve the error message back to the end user to flag that "these refs failed to update since the atomic push operation failed." Signed-off-by: Ronnie Sahlberg Signed-off-by: Stefan Beller --- Documentation/git-send-pack.txt | 7 ++++++- builtin/send-pack.c | 6 +++++- remote.h | 3 ++- send-pack.c | 39 ++++++++++++++++++++++++++++++++++----- send-pack.h | 1 + transport.c | 4 ++++ 6 files changed, 52 insertions(+), 8 deletions(-) diff --git a/Documentation/git-send-pack.txt b/Documentation/git-send-pack.txt index 2a0de42..9296587 100644 --- a/Documentation/git-send-pack.txt +++ b/Documentation/git-send-pack.txt @@ -9,7 +9,7 @@ git-send-pack - Push objects over Git protocol to another repository SYNOPSIS -------- [verse] -'git send-pack' [--all] [--dry-run] [--force] [--receive-pack=] [--verbose] [--thin] [:] [...] +'git send-pack' [--all] [--dry-run] [--force] [--receive-pack=] [--verbose] [--thin] [--atomic-push] [:] [...] DESCRIPTION ----------- @@ -62,6 +62,11 @@ be in a separate packet, and the list must end with a flush packet. Send a "thin" pack, which records objects in deltified form based on objects not included in the pack to reduce network traffic. +--atomic-push:: + Use an atomic transaction for updating the refs. If any of the refs + fails to update then the entire push will fail without changing any + refs. + :: A remote host to house the repository. When this part is specified, 'git-receive-pack' is invoked via diff --git a/builtin/send-pack.c b/builtin/send-pack.c index b564a77..93cb17c 100644 --- a/builtin/send-pack.c +++ b/builtin/send-pack.c @@ -13,7 +13,7 @@ #include "sha1-array.h" static const char send_pack_usage[] = -"git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=] [--verbose] [--thin] [:] [...]\n" +"git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=] [--verbose] [--thin] [--atomic-push] [:] [...]\n" " --all and explicit specification are mutually exclusive."; static struct send_pack_args args; @@ -170,6 +170,10 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix) args.use_thin_pack = 1; continue; } + if (!strcmp(arg, "--atomic-push")) { + args.use_atomic_push = 1; + continue; + } if (!strcmp(arg, "--stateless-rpc")) { args.stateless_rpc = 1; continue; diff --git a/remote.h b/remote.h index 8b62efd..f346524 100644 --- a/remote.h +++ b/remote.h @@ -115,7 +115,8 @@ struct ref { REF_STATUS_REJECT_SHALLOW, REF_STATUS_UPTODATE, REF_STATUS_REMOTE_REJECT, - REF_STATUS_EXPECTING_REPORT + REF_STATUS_EXPECTING_REPORT, + REF_STATUS_ATOMIC_PUSH_FAILED } status; char *remote_status; struct ref *peer_ref; /* when renaming */ diff --git a/send-pack.c b/send-pack.c index 1ccc84c..08602a8 100644 --- a/send-pack.c +++ b/send-pack.c @@ -190,7 +190,7 @@ static void advertise_shallow_grafts_buf(struct strbuf *sb) for_each_commit_graft(advertise_shallow_grafts_cb, sb); } -static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args) +static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args, int *atomic_push_failed) { if (!ref->peer_ref && !args->send_mirror) return 0; @@ -203,6 +203,12 @@ static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_a case REF_STATUS_REJECT_NEEDS_FORCE: case REF_STATUS_REJECT_STALE: case REF_STATUS_REJECT_NODELETE: + if (atomic_push_failed) { + fprintf(stderr, "Atomic push failed for ref %s. " + "Status:%d\n", ref->name, ref->status); + *atomic_push_failed = 1; + } + /* fallthrough */ case REF_STATUS_UPTODATE: return 0; default: @@ -250,7 +256,7 @@ static int generate_push_cert(struct strbuf *req_buf, strbuf_addstr(&cert, "\n"); for (ref = remote_refs; ref; ref = ref->next) { - if (!ref_update_to_be_sent(ref, args)) + if (!ref_update_to_be_sent(ref, args, NULL)) continue; update_seen = 1; strbuf_addf(&cert, "%s %s %s\n", @@ -297,7 +303,7 @@ int send_pack(struct send_pack_args *args, int atomic_push_supported = 0; int atomic_push = 0; unsigned cmds_sent = 0; - int ret; + int ret, atomic_push_failed = 0; struct async demux; const char *push_cert_nonce = NULL; @@ -332,6 +338,11 @@ int send_pack(struct send_pack_args *args, "Perhaps you should specify a branch such as 'master'.\n"); return 0; } + if (args->use_atomic_push && !atomic_push_supported) { + fprintf(stderr, "Server does not support atomic-push."); + return -1; + } + atomic_push = atomic_push_supported && args->use_atomic_push; if (status_report) strbuf_addstr(&cap_buf, " report-status"); @@ -365,7 +376,8 @@ int send_pack(struct send_pack_args *args, * the pack data. */ for (ref = remote_refs; ref; ref = ref->next) { - if (!ref_update_to_be_sent(ref, args)) + if (!ref_update_to_be_sent(ref, args, + args->use_atomic_push ? &atomic_push_failed : NULL)) continue; if (!ref->deletion) @@ -377,6 +389,23 @@ int send_pack(struct send_pack_args *args, ref->status = REF_STATUS_EXPECTING_REPORT; } + if (atomic_push_failed) { + for (ref = remote_refs; ref; ref = ref->next) { + if (!ref->peer_ref && !args->send_mirror) + continue; + + switch (ref->status) { + case REF_STATUS_EXPECTING_REPORT: + ref->status = REF_STATUS_ATOMIC_PUSH_FAILED; + continue; + default: + ; /* do nothing */ + } + } + fprintf(stderr, "Atomic push failed."); + return -1; + } + /* * Finally, tell the other end! */ @@ -386,7 +415,7 @@ int send_pack(struct send_pack_args *args, if (args->dry_run || args->push_cert) continue; - if (!ref_update_to_be_sent(ref, args)) + if (!ref_update_to_be_sent(ref, args, NULL)) continue; old_hex = sha1_to_hex(ref->old_sha1); diff --git a/send-pack.h b/send-pack.h index 5635457..7486e65 100644 --- a/send-pack.h +++ b/send-pack.h @@ -11,6 +11,7 @@ struct send_pack_args { force_update:1, use_thin_pack:1, use_ofs_delta:1, + use_atomic_push:1, dry_run:1, push_cert:1, stateless_rpc:1; diff --git a/transport.c b/transport.c index f70d62f..2111986 100644 --- a/transport.c +++ b/transport.c @@ -731,6 +731,10 @@ static int print_one_push_status(struct ref *ref, const char *dest, int count, i ref->deletion ? NULL : ref->peer_ref, "remote failed to report status", porcelain); break; + case REF_STATUS_ATOMIC_PUSH_FAILED: + print_ref_status('!', "[rejected]", ref, ref->peer_ref, + "atomic-push-failed", porcelain); + break; case REF_STATUS_OK: print_ok_ref_status(ref, porcelain); break; -- 2.2.0.rc2.5.gf7b9fb2