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exchangev2: fetch manifest revisions...
exchangev2: fetch manifest revisions Now that the server has support for retrieving manifest data, we can implement the client bits to call it. We teach the changeset fetching code to capture the manifest revisions that are encountered on incoming changesets. We then feed this into a new function which filters out known manifests and then batches up manifest data requests to the server. This is different from the previous wire protocol in a few notable ways. First, the client fetches manifest data separately and explicitly. Before, we'd ask the server for data pertaining to some changesets (via a "getbundle" command) and manifests (and files) would be sent automatically. Providing an API for looking up just manifest data separately gives clients much more flexibility for manifest management. For example, a client may choose to only fetch manifest data on demand instead of prefetching it (i.e. partial clone). Second, we send N commands to the server for manifest retrieval instead of 1. This property has a few nice side-effects. One is that the deterministic nature of the requests lends itself to server-side caching. For example, say the remote has 50,000 manifests. If the server is configured to cache responses, each time a new commit arrives, you will have a cache miss and need to regenerate all outgoing data. But if you makes N requests requesting 10,000 manifests each, a new commit will still yield cache hits on the initial, unchanged manifest batches/requests. A derived benefit from these properties is that resumable clone is conceptually simpler to implement. When making a monolithic request for all of the repository data, recovering from an interrupted clone is hard because the server was in the driver's seat and was maintaining state about all the data that needed transferred. With the client driving fetching, the client can persist the set of unfetched entities and retry/resume a fetch if something goes wrong. Or we can fetch all data N changesets at a time and slowly build up a repository. This approach is drastically easier to implement when we have server APIs exposing low-level repository primitives (such as manifests and files). We don't yet support tree manifests. But it should be possible to implement that with the existing wire protocol command. Differential Revision: https://phab.mercurial-scm.org/D4489

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scmwindows.py
61 lines | 1.9 KiB | text/x-python | PythonLexer
Gregory Szorc
scmwindows: use absolute_import
r27481 from __future__ import absolute_import
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 import os
Gregory Szorc
scmwindows: use absolute_import
r27481
from . import (
Pulkit Goyal
py3: replace os.environ with encoding.environ (part 4 of 5)
r30637 encoding,
Pulkit Goyal
py3: replace os.pathsep with pycompat.ospathsep...
r30612 pycompat,
Gregory Szorc
scmwindows: use absolute_import
r27481 util,
Yuya Nishihara
scmutil: move util.termwidth()...
r30309 win32,
Gregory Szorc
scmwindows: use absolute_import
r27481 )
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690
Pulkit Goyal
py3: conditionalize _winreg import...
r29760 try:
import _winreg as winreg
winreg.CloseKey
except ImportError:
import winreg
Yuya Nishihara
pager: use less as a fallback on Unix...
r32078 # MS-DOS 'more' is the only pager available by default on Windows.
fallbackpager = 'more'
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 def systemrcpath():
'''return default os-specific hgrc search path'''
rcpath = []
Yuya Nishihara
rcutil: directly call win32.executablepath()...
r37113 filename = win32.executablepath()
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 # Use mercurial.ini found in directory with hg.exe
progrc = os.path.join(os.path.dirname(filename), 'mercurial.ini')
Mads Kiilerich
windows: read all global config files, not just the first (issue4491) (BC)...
r26625 rcpath.append(progrc)
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 # Use hgrc.d found in directory with hg.exe
progrcd = os.path.join(os.path.dirname(filename), 'hgrc.d')
if os.path.isdir(progrcd):
Yuya Nishihara
osutil: proxy through util (and platform) modules (API)...
r32203 for f, kind in util.listdir(progrcd):
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 if f.endswith('.rc'):
rcpath.append(os.path.join(progrcd, f))
# else look for a system rcpath in the registry
value = util.lookupreg('SOFTWARE\\Mercurial', None,
Pulkit Goyal
py3: conditionalize _winreg import...
r29760 winreg.HKEY_LOCAL_MACHINE)
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 if not isinstance(value, str) or not value:
return rcpath
value = util.localpath(value)
Pulkit Goyal
py3: replace os.pathsep with pycompat.ospathsep...
r30612 for p in value.split(pycompat.ospathsep):
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 if p.lower().endswith('mercurial.ini'):
rcpath.append(p)
elif os.path.isdir(p):
Yuya Nishihara
osutil: proxy through util (and platform) modules (API)...
r32203 for f, kind in util.listdir(p):
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 if f.endswith('.rc'):
rcpath.append(os.path.join(p, f))
return rcpath
def userrcpath():
'''return os-specific hgrc search path to the user dir'''
home = os.path.expanduser('~')
path = [os.path.join(home, 'mercurial.ini'),
os.path.join(home, '.hgrc')]
Pulkit Goyal
py3: replace os.environ with encoding.environ (part 4 of 5)
r30637 userprofile = encoding.environ.get('USERPROFILE')
Mads Kiilerich
config: don't read the same config file twice...
r22583 if userprofile and userprofile != home:
Kevin Bullock
scmutil: split platform-specific bits into their own modules...
r18690 path.append(os.path.join(userprofile, 'mercurial.ini'))
path.append(os.path.join(userprofile, '.hgrc'))
return path
Yuya Nishihara
scmutil: move util.termwidth()...
r30309
Yuya Nishihara
scmutil: extend termwidth() to return terminal height, renamed to termsize()...
r30314 def termsize(ui):
return win32.termsize()