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annotate hgsubversion/layouts/detect.py @ 1006:7a3b938825cd

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layouts: refactor layout loading and persisting out of svnmeta.py
author David Schleimer <dschleimer@fb.com>
date Wed, 17 Apr 2013 16:14:15 -0700
parents 5bba4d1becde
children e95f4de8709a
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1004
b2d89ba6b871 layouts: pull out code for detecting layout from subversion
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1 """ Layout detection for subversion repos.
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2
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3 Figure out what layout we should be using, based on config, command
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4 line flags, subversion contents, and anything else we decide to base
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5 it on.
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6
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7 """
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8
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9 import os.path
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10
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11 from mercurial import util as hgutil
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12
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13 import hgsubversion.svnwrap
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14
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15 def layout_from_subversion(svn, revision=None, ui=None):
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16 """ Guess what layout to use based on directories under the svn root.
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17
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18 This is intended for use during bootstrapping. It guesses which
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19 layout to use based on the presence or absence of the conventional
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20 trunk, branches, tags dirs immediately under the path your are
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21 cloning.
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22
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23 Additionally, this will write the layout in use to the ui object
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24 passed, if any.
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25
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26 """
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27
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28 try:
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29 rootlist = svn.list_dir('', revision=revision)
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30 except svnwrap.SubversionException, e:
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31 err = "%s (subversion error: %d)" % (e.args[0], e.args[1])
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32 raise hgutil.Abort(err)
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33 if sum(map(lambda x: x in rootlist, ('branches', 'tags', 'trunk'))):
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34 layout = 'standard'
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35 else:
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36 layout = 'single'
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37 ui.setconfig('hgsubversion', 'layout', layout)
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38 return layout
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39
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40 def layout_from_config(ui, allow_auto=False):
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41 """ Load the layout we are using based on config
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42
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43 We will read the config from the ui object. Pass allow_auto=True
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44 if you are doing bootstrapping and can detect the layout in
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45 another manner if you get auto. Otherwise, we will abort if we
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46 detect the layout as auto.
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47 """
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48
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49 layout = ui.config('hgsubversion', 'layout', default='auto')
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50 if layout == 'auto' and not allow_auto:
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51 raise hgutil.Abort('layout not yet determined')
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52 elif layout not in ('auto', 'single', 'standard'):
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53 raise hgutil.Abort("unknown layout '%s'" % layout)
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54 return layout
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55
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56 def layout_from_file(meta_data_dir, ui=None):
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57 """ Load the layout in use from the metadata file.
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58
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59 If you pass the ui arg, we will also write the layout to the
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60 config for that ui.
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61
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62 """
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63
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64 layout = None
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65 layoutfile = os.path.join(meta_data_dir, 'layout')
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66 if os.path.exists(layoutfile):
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67 f = open(layoutfile)
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68 layout = f.read().strip()
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69 f.close()
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70 if ui:
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71 ui.setconfig('hgsubversion', 'layout', layout)
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72 return layout