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send-pack.c: add --atomic command line argument

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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.

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 <sahlberg@google.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ronnie Sahlberg
2015-01-07 19:23:22 -08:00
committed by Junio C Hamano
parent 7582e9397c
commit 4ff17f10c4
6 changed files with 66 additions and 6 deletions
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7
Documentation/git-send-pack.txt
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@ -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=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]
'git send-pack' [--all] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [--atomic] [<host>:]<directory> [<ref>...]
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::
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.
<host>::
A remote host to house the repository. When this
part is specified, 'git-receive-pack' is invoked via