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transaction: register summary callbacks only at start of transaction (BC)
We currently register summary callbacks every time
localrepo.transaction() is called, so both when the transaction is
started and when a nested transaction is created. That seems a little
weirdly asymmetric, because the summary callbacks are thus not
necessarily registred at the beginning of the outermost transaction,
but they are only called when the outermost transaction closes (not
when a nested transaction closes).
I want to add another summary callback that records the repo state at
the beginning of the transaction and compares to that when the
transaction closes. However, because of the registration that happens
when a nested transaction is created, that would need to go through
extra trouble to not overwrite the callback and report the difference
from the start time of the innermost transaction to the close of the
outermost transaction.
Also, the callbacks are registered with a name based on the order they
are defined in the registersummarycallback(). For example, if both the
"new changesets %s" and the "obsoleted %i changesets" hooks are
registered, the first would be called 00-txnreport and the second
would be called 01-txnreport. That gets really weird if
registersummarycallback() gets called multiple times, because the last
one wins, and a depending on which of the two callbacks get
registered, we might hypothetically even overwrite on type of callback
with another. For example, if when the outer transaction was started,
we registered the "new changesets %s" callback first, and when the
inner transaction was started, we registered only the "obsoleted %i
changesets" callback, then only the latter message would get
printed. What makes it hypothetical is that what gets registered
depends on the transaction name, and the set of transaction names that
we match on for the former latter message is a subset of the set of
names we match on for the former. Still, that seems like a bug waiting
to happen.
That second issue could be solved independently, but the first issue
seems enough for me to consider it a bug (affecting developers, not
users), so this patch simply drops that extra registration.
Note that this affects "hg transplant" in a user-visible way. When "hg
transplant" is asked to transplant from a remote repo so it involves a
pull, then the outermost transaction name is "transplant" and an inner
transaction is created for "pull". That inner transaction is what led
us to sometimes report "new changesets %s" from "hg transplant". After
this patch, that no longer happens. That seems fine to me. We can make
it instead print the message for all "hg transplant" invocations if we
want (not just those involving a remote), but I'll leave that for
someone else to do if they think it's important.
Differential Revision: https://phab.mercurial-scm.org/D1866
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 10 Jan 2018 14:00:23 -0800 |
parents | c29efd272395 |
children |
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[This file is here for historical purposes, all recent contributors should appear in the changelog directly] Andrea Arcangeli <andrea at suse.de> Thomas Arendsen Hein <thomas at intevation.de> Goffredo Baroncelli <kreijack at libero.it> Muli Ben-Yehuda <mulix at mulix.org> Mikael Berthe <mikael at lilotux.net> Benoit Boissinot <bboissin at gmail.com> Brendan Cully <brendan at kublai.com> Vincent Danjean <vdanjean.ml at free.fr> Jake Edge <jake at edge2.net> Michael Fetterman <michael.fetterman at intel.com> Edouard Gomez <ed.gomez at free.fr> Eric Hopper <hopper at omnifarious.org> Alecs King <alecsk at gmail.com> Volker Kleinfeld <Volker.Kleinfeld at gmx.de> Vadim Lebedev <vadim at mbdsys.com> Christopher Li <hg at chrisli.org> Chris Mason <mason at suse.com> Colin McMillen <mcmillen at cs.cmu.edu> Wojciech Milkowski <wmilkowski at interia.pl> Chad Netzer <chad.netzer at gmail.com> Bryan O'Sullivan <bos at serpentine.com> Vicent SeguĂ Pascual <vseguip at gmail.com> Sean Perry <shaleh at speakeasy.net> Nguyen Anh Quynh <aquynh at gmail.com> Ollivier Robert <roberto at keltia.freenix.fr> Alexander Schremmer <alex at alexanderweb.de> Arun Sharma <arun at sharma-home.net> Josef "Jeff" Sipek <jeffpc at optonline.net> Kevin Smith <yarcs at qualitycode.com> TK Soh <teekaysoh at yahoo.com> Radoslaw Szkodzinski <astralstorm at gorzow.mm.pl> Samuel Tardieu <sam at rfc1149.net> K Thananchayan <thananck at yahoo.com> Andrew Thompson <andrewkt at aktzero.com> Michael S. Tsirkin <mst at mellanox.co.il> Rafael Villar Burke <pachi at mmn-arquitectos.com> Tristan Wibberley <tristan at wibberley.org> Mark Williamson <mark.williamson at cl.cam.ac.uk>