Mercurial > hg
annotate hgext/narrow/narrowcopies.py @ 39814:d059cb669632
wireprotov2: allow multiple fields to follow revision maps
The *data wire protocol commands emit a series of CBOR values.
Because revision/delta data may be large, their data is emitted
outside the map as a top-level bytestring value.
Before this commit, we'd emit a single optional bytestring
value after the revision descriptor map. This got the job done.
But it was limiting in that we could only send a single field.
And, it required the consumer to know that the presence of a
key in the map implied the existence of a following bytestring
value.
This commit changes the encoding strategy so top-level bytestring
values in the stream are explicitly denoted in a "fieldsfollowing"
key. This key contains an array defining what fields that follow
and the expected size of each field.
By defining things this way, we can easily send N bytestring
values without any ambiguity about their order. In addition,
clients only need to know how to parse ``fieldsfollowing`` to
know if extra values are present.
Because this breaks backwards compatibility, we've bumped the version
number of the wire protocol version 2 API endpoint.
Differential Revision: https://phab.mercurial-scm.org/D4620
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 20 Sep 2018 12:57:23 -0700 |
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1 # narrowcopies.py - extensions to mercurial copies module to support narrow |
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2 # clones |
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3 # |
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4 # Copyright 2017 Google, Inc. |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 |
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9 from __future__ import absolute_import |
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10 |
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11 from mercurial import ( |
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12 copies, |
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13 extensions, |
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14 ) |
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15 |
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16 def setup(repo): |
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17 def _computeforwardmissing(orig, a, b, match=None): |
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18 missing = orig(a, b, match) |
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19 narrowmatch = repo.narrowmatch() |
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20 if narrowmatch.always(): |
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21 return missing |
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22 missing = [f for f in missing if narrowmatch(f)] |
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23 return missing |
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24 |
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25 def _checkcopies(orig, srcctx, dstctx, f, base, tca, remotebase, limit, |
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26 data): |
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27 narrowmatch = repo.narrowmatch() |
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28 if not narrowmatch(f): |
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29 return |
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30 orig(srcctx, dstctx, f, base, tca, remotebase, limit, data) |
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31 |
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32 extensions.wrapfunction(copies, '_computeforwardmissing', |
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33 _computeforwardmissing) |
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34 extensions.wrapfunction(copies, '_checkcopies', _checkcopies) |