| 1 | # -*- mode: python; coding: utf-8 -*- |
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| 2 | # :Progetto: Tailor -- Darcs peculiarities when used as a source |
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| 3 | # :Creato: lun 10 lug 2006 00:04:59 CEST |
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| 4 | # :Autore: Lele Gaifax <lele@nautilus.homeip.net> |
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| 5 | # :Licenza: GNU General Public License |
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| 6 | # |
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| 7 | |
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| 8 | """ |
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| 9 | This module contains the source specific bits of the darcs backend. |
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| 10 | """ |
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| 11 | |
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| 12 | __docformat__ = 'reStructuredText' |
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| 13 | |
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| 14 | import re |
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| 15 | |
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| 16 | from vcpx.shwrap import ExternalCommand, PIPE, STDOUT |
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| 17 | from vcpx.source import UpdatableSourceWorkingDir, ChangesetApplicationFailure, \ |
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| 18 | GetUpstreamChangesetsFailure |
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| 19 | from vcpx.target import TargetInitializationFailure |
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| 20 | from vcpx.tzinfo import UTC |
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| 21 | |
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| 22 | |
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| 23 | def changesets_from_darcschanges(changes, unidiff=False, repodir=None, |
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| 24 | chunksize=2**15): |
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| 25 | """ |
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| 26 | Parse XML output of ``darcs changes``. |
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| 27 | |
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| 28 | Return a list of ``Changeset`` instances. |
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| 29 | |
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| 30 | Filters out the (currently incorrect) tag info from |
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| 31 | changesets_from_darcschanges_unsafe. |
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| 32 | """ |
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| 33 | |
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| 34 | csets = changesets_from_darcschanges_unsafe(changes, unidiff, |
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| 35 | repodir, chunksize) |
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| 36 | for cs in csets: |
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| 37 | cs.tags = None |
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| 38 | yield cs |
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| 39 | |
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| 40 | def changesets_from_darcschanges_unsafe(changes, unidiff=False, repodir=None, |
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| 41 | chunksize=2**15): |
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| 42 | """ |
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| 43 | Do the real work of parsing the change log, including tags. |
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| 44 | Warning: the tag information in the changsets returned by this |
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| 45 | function are only correct if each darcs tag in the repo depends on |
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| 46 | all of the patches that precede it. This is not a valid |
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| 47 | assumption in general--a tag that does not depend on patch P can |
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| 48 | be pulled in from another darcs repo after P. We collect the tag |
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| 49 | info anyway because DarcsWorkingDir._currentTags() can use it |
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| 50 | safely despite this problem. Hopefully the problem will |
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| 51 | eventually be fixed and this function can be renamed |
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| 52 | changesets_from_darcschanges. |
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| 53 | """ |
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| 54 | from xml.sax import make_parser |
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| 55 | from xml.sax.handler import ContentHandler, ErrorHandler |
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| 56 | from datetime import datetime |
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| 57 | from vcpx.changes import ChangesetEntry, Changeset |
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| 58 | |
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| 59 | class DarcsXMLChangesHandler(ContentHandler): |
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| 60 | def __init__(self): |
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| 61 | self.changesets = [] |
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| 62 | self.current = None |
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| 63 | self.current_field = [] |
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| 64 | if unidiff and repodir: |
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| 65 | cmd = ["darcs", "diff", "--unified", "--repodir", repodir, |
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| 66 | "--patch", "%(patchname)s"] |
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| 67 | self.darcsdiff = ExternalCommand(command=cmd) |
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| 68 | else: |
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| 69 | self.darcsdiff = None |
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| 70 | |
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| 71 | def startElement(self, name, attributes): |
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| 72 | if name == 'patch': |
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| 73 | self.current = {} |
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| 74 | self.current['author'] = attributes['author'] |
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| 75 | date = attributes['date'] |
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| 76 | from time import strptime |
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| 77 | try: |
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| 78 | # 20040619130027 |
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| 79 | timestamp = datetime(*strptime(date, '%Y%m%d%H%M%S')[:6]) |
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| 80 | except ValueError: |
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| 81 | # Old darcs patches use the form Sun Oct 20 20:01:05 EDT 2002 |
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| 82 | timestamp = datetime(*strptime(date[:19] + date[-5:], '%a %b %d %H:%M:%S %Y')[:6]) |
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| 83 | |
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| 84 | timestamp = timestamp.replace(tzinfo=UTC) # not true for the ValueError case, but oh well |
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| 85 | |
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| 86 | self.current['date'] = timestamp |
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| 87 | self.current['comment'] = '' |
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| 88 | self.current['hash'] = attributes['hash'] |
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| 89 | self.current['entries'] = [] |
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| 90 | elif name in ['name', 'comment', 'add_file', 'add_directory', |
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| 91 | 'modify_file', 'remove_file', 'remove_directory']: |
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| 92 | self.current_field = [] |
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| 93 | elif name == 'move': |
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| 94 | self.old_name = attributes['from'] |
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| 95 | self.new_name = attributes['to'] |
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| 96 | |
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| 97 | def endElement(self, name): |
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| 98 | if name == 'patch': |
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| 99 | entries = [] |
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| 100 | todo = self.current['entries'] |
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| 101 | # Darcs allows "rename A B; remove B": collapse those |
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| 102 | # into "remove A" |
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| 103 | while todo: |
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| 104 | e = todo.pop(0) |
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| 105 | if e.action_kind == e.RENAMED: |
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| 106 | lookfor = e.name |
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| 107 | forget = [] |
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| 108 | for i,n in enumerate(todo): |
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| 109 | if n.action_kind == n.DELETED and n.name == lookfor: |
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| 110 | e.action_kind = e.DELETED |
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| 111 | e.name = e.old_name |
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| 112 | e.old_name = None |
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| 113 | entries.append(e) |
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| 114 | forget.append(i) |
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| 115 | forget.reverse() |
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| 116 | for i in forget: |
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| 117 | del todo[i] |
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| 118 | break |
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| 119 | elif n.action_kind == n.RENAMED and n.old_name == lookfor: |
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| 120 | forget.append(i) |
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| 121 | lookfor = n.name |
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| 122 | if not forget: |
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| 123 | entries.append(e) |
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| 124 | else: |
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| 125 | entries.append(e) |
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| 126 | |
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| 127 | # Darcs changes --xml (as of 1.0.7) emits bad ordered hunks: it |
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| 128 | # begins with file moves, apparently for no good reason. Do as |
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| 129 | # little reordering as needed to adjust the meaning, ie moving all |
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| 130 | # add_dirs before add_file and ren_file that have that dir as |
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| 131 | # target |
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| 132 | |
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| 133 | sorted = False |
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| 134 | while not sorted: |
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| 135 | sorted = True |
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| 136 | for i,e in enumerate(entries): |
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| 137 | if e.action_kind == e.RENAMED: |
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| 138 | for j,n in enumerate(entries[i+1:]): |
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| 139 | if ((e.name.startswith(n.name+'/') or e.old_name==n.name) and |
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| 140 | (n.action_kind == n.ADDED or n.action_kind == n.RENAMED)): |
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| 141 | m = entries.pop(i+1+j) |
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| 142 | entries.insert(i, m) |
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| 143 | sorted = False |
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| 144 | |
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| 145 | cset = Changeset(self.current['name'], |
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| 146 | self.current['date'], |
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| 147 | self.current['author'], |
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| 148 | self.current['comment'], |
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| 149 | entries, |
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| 150 | tags=self.current.get('tags',[])) |
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| 151 | cset.darcs_hash = self.current['hash'] |
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| 152 | if self.darcsdiff: |
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| 153 | cset.unidiff = self.darcsdiff.execute( |
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| 154 | stdout=PIPE, patchname=cset.revision)[0].read() |
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| 155 | |
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| 156 | self.changesets.append(cset) |
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| 157 | self.current = None |
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| 158 | elif name in ['name', 'comment']: |
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| 159 | val = ''.join(self.current_field) |
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| 160 | if val[:4] == 'TAG ': |
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| 161 | self.current.setdefault('tags',[]).append(val[4:]) |
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| 162 | self.current[name] = val |
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| 163 | elif name == 'move': |
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| 164 | entry = ChangesetEntry(self.new_name) |
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| 165 | entry.action_kind = entry.RENAMED |
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| 166 | entry.old_name = self.old_name |
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| 167 | self.current['entries'].append(entry) |
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| 168 | elif name in ['add_file', 'add_directory', 'modify_file', |
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| 169 | 'remove_file', 'remove_directory']: |
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| 170 | entry = ChangesetEntry(''.join(self.current_field).strip()) |
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| 171 | entry.action_kind = { 'add_file': entry.ADDED, |
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| 172 | 'add_directory': entry.ADDED, |
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| 173 | 'modify_file': entry.UPDATED, |
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| 174 | 'remove_file': entry.DELETED, |
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| 175 | 'remove_directory': entry.DELETED |
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| 176 | }[name] |
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| 177 | |
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| 178 | self.current['entries'].append(entry) |
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| 179 | |
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| 180 | def characters(self, data): |
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| 181 | self.current_field.append(data) |
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| 182 | |
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| 183 | parser = make_parser() |
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| 184 | handler = DarcsXMLChangesHandler() |
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| 185 | parser.setContentHandler(handler) |
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| 186 | parser.setErrorHandler(ErrorHandler()) |
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| 187 | |
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| 188 | chunk = changes.read(chunksize) |
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| 189 | while chunk: |
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| 190 | parser.feed(chunk) |
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| 191 | for cs in handler.changesets: |
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| 192 | yield cs |
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| 193 | handler.changesets = [] |
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| 194 | chunk = changes.read(chunksize) |
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| 195 | parser.close() |
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| 196 | for cs in handler.changesets: |
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| 197 | yield cs |
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| 198 | |
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| 199 | |
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| 200 | class DarcsSourceWorkingDir(UpdatableSourceWorkingDir): |
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| 201 | """ |
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| 202 | A source working directory under ``darcs``. |
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| 203 | """ |
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| 204 | |
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| 205 | is_hash_rx = re.compile('[0-9a-f]{14}-[0-9a-f]{5}-[0-9a-f]{40}\.gz') |
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| 206 | |
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| 207 | def _getUpstreamChangesets(self, sincerev): |
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| 208 | """ |
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| 209 | Do the actual work of fetching the upstream changeset. |
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| 210 | """ |
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| 211 | |
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| 212 | from datetime import datetime |
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| 213 | from time import strptime |
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| 214 | from sha import new |
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| 215 | from vcpx.changes import Changeset |
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| 216 | |
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| 217 | cmd = self.repository.command("pull", "--dry-run") |
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| 218 | pull = ExternalCommand(cwd=self.repository.basedir, command=cmd) |
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| 219 | output = pull.execute(self.repository.repository, |
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| 220 | stdout=PIPE, stderr=STDOUT, TZ='UTC0')[0] |
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| 221 | |
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| 222 | if pull.exit_status: |
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| 223 | raise GetUpstreamChangesetsFailure( |
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| 224 | "%s returned status %d saying\n%s" % |
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| 225 | (str(pull), pull.exit_status, output.read())) |
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| 226 | |
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| 227 | l = output.readline() |
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| 228 | while l and not (l.startswith('Would pull the following changes:') or |
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| 229 | l == 'No remote changes to pull in!\n'): |
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| 230 | l = output.readline() |
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| 231 | |
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| 232 | if l <> 'No remote changes to pull in!\n': |
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| 233 | ## Sat Jul 17 01:22:08 CEST 2004 lele@nautilus |
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| 234 | ## * Refix _getUpstreamChangesets for darcs |
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| 235 | |
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| 236 | l = output.readline() |
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| 237 | while not l.startswith('Making no changes: this is a dry run.'): |
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| 238 | # Assume it's a line like |
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| 239 | # Sun Jan 2 00:24:04 UTC 2005 lele@nautilus.homeip.net |
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| 240 | # we used to split on the double space before the email, |
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| 241 | # but in this case this is wrong. Waiting for xml output, |
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| 242 | # is it really sane asserting date's length to 28 chars? |
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| 243 | date = l[:28] |
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| 244 | author = l[30:-1] |
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| 245 | y,m,d,hh,mm,ss,d1,d2,d3 = strptime(date, "%a %b %d %H:%M:%S %Z %Y") |
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| 246 | date = datetime(y,m,d,hh,mm,ss,0,UTC) |
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| 247 | l = output.readline() |
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| 248 | assert (l.startswith(' * ') or |
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| 249 | l.startswith(' UNDO:') or |
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| 250 | l.startswith(' tagged')) |
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| 251 | |
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| 252 | if l.startswith(' *'): |
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| 253 | name = l[4:-1] |
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| 254 | else: |
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| 255 | name = l[2:-1] |
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| 256 | |
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| 257 | changelog = [] |
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| 258 | l = output.readline() |
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| 259 | while l.startswith(' '): |
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| 260 | changelog.append(l[2:-1]) |
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| 261 | l = output.readline() |
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| 262 | |
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| 263 | cset = Changeset(name, date, author, '\n'.join(changelog)) |
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| 264 | compactdate = date.strftime("%Y%m%d%H%M%S") |
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| 265 | if name.startswith('UNDO: '): |
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| 266 | name = name[6:] |
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| 267 | inverted = 't' |
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| 268 | else: |
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| 269 | inverted = 'f' |
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| 270 | phash = new() |
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| 271 | phash.update(name) |
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| 272 | phash.update(author) |
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| 273 | phash.update(compactdate) |
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| 274 | phash.update(''.join(changelog)) |
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| 275 | phash.update(inverted) |
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| 276 | cset.darcs_hash = '%s-%s-%s.gz' % (compactdate, |
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| 277 | new(author).hexdigest()[:5], |
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| 278 | phash.hexdigest()) |
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| 279 | |
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| 280 | if name.startswith('tagged'): |
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| 281 | self.log.warning("Skipping tag %s because I don't " |
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| 282 | "propagate tags from darcs.", name) |
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| 283 | else: |
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| 284 | yield cset |
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| 285 | |
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| 286 | while not l.strip(): |
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| 287 | l = output.readline() |
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| 288 | |
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| 289 | def _applyChangeset(self, changeset): |
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| 290 | """ |
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| 291 | Do the actual work of applying the changeset to the working copy. |
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| 292 | """ |
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| 293 | |
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| 294 | needspatchesopt = False |
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| 295 | if hasattr(changeset, 'darcs_hash'): |
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| 296 | selector = '--match' |
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| 297 | revtag = 'hash ' + changeset.darcs_hash |
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| 298 | elif changeset.revision.startswith('tagged '): |
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| 299 | selector = '--tag' |
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| 300 | revtag = changeset.revision[7:] |
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| 301 | else: |
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| 302 | selector = '--match' |
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| 303 | revtag = 'date "%s" && author "%s"' % ( |
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| 304 | changeset.date.strftime("%Y%m%d%H%M%S"), |
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| 305 | changeset.author) |
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| 306 | # The 'exact' matcher doesn't groke double quotes: |
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| 307 | # """currently there is no provision for escaping a double |
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| 308 | # quote, so you have to choose between matching double |
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| 309 | # quotes and matching spaces""" |
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| 310 | if not '"' in changeset.revision: |
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| 311 | revtag += ' && exact "%s"' % changeset.revision.replace('%', '%%') |
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| 312 | else: |
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| 313 | needspatchesopt = True |
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| 314 | |
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| 315 | cmd = self.repository.command("pull", "--all", "--quiet", |
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| 316 | selector, revtag) |
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| 317 | |
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| 318 | if needspatchesopt: |
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| 319 | cmd.extend(['--patches', re.escape(changeset.revision)]) |
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| 320 | |
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| 321 | pull = ExternalCommand(cwd=self.repository.basedir, command=cmd) |
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| 322 | output = pull.execute(stdout=PIPE, stderr=STDOUT, input='y')[0] |
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| 323 | |
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| 324 | if pull.exit_status: |
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| 325 | raise ChangesetApplicationFailure( |
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| 326 | "%s returned status %d saying\n%s" % |
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| 327 | (str(pull), pull.exit_status, output.read())) |
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| 328 | |
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| 329 | conflicts = [] |
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| 330 | line = output.readline() |
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| 331 | while line: |
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| 332 | if line.startswith('We have conflicts in the following files:'): |
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| 333 | files = output.readline()[:-1].split('./')[1:] |
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| 334 | self.log.warning("Conflict after 'darcs pull': %s", |
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| 335 | ' '.join(files)) |
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| 336 | conflicts.extend(['./' + f for f in files]) |
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| 337 | line = output.readline() |
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| 338 | |
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| 339 | cmd = self.repository.command("changes", selector, revtag, |
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| 340 | "--xml-output", "--summ") |
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| 341 | changes = ExternalCommand(cwd=self.repository.basedir, command=cmd) |
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| 342 | last = changesets_from_darcschanges(changes.execute(stdout=PIPE)[0]) |
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| 343 | try: |
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| 344 | changeset.entries.extend(last.next().entries) |
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| 345 | except StopIteration: |
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| 346 | pass |
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| 347 | |
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| 348 | return conflicts |
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| 349 | |
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| 350 | def _handleConflict(self, changeset, conflicts, conflict): |
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| 351 | """ |
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| 352 | Handle the conflict raised by the application of the upstream changeset. |
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| 353 | |
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| 354 | Override parent behaviour: with darcs, we need to execute a revert |
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| 355 | on the conflicted files, **trashing** local changes, but there should |
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| 356 | be none of them in tailor context. |
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| 357 | """ |
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| 358 | |
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| 359 | self.log.info("Reverting changes to %s, to solve the conflict", |
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| 360 | ' '.join(conflict)) |
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| 361 | cmd = self.repository.command("revert", "--all") |
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| 362 | revert = ExternalCommand(cwd=self.repository.basedir, command=cmd) |
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| 363 | revert.execute(conflict) |
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| 364 | |
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| 365 | def _checkoutUpstreamRevision(self, revision): |
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| 366 | """ |
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| 367 | Concretely do the checkout of the upstream revision and return |
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| 368 | the last applied changeset. |
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| 369 | """ |
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| 370 | |
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| 371 | from os.path import join, exists |
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| 372 | from os import mkdir |
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| 373 | from vcpx.source import InvocationError |
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| 374 | |
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| 375 | if not self.repository.repository: |
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| 376 | raise InvocationError("Must specify a the darcs source repository") |
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| 377 | |
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| 378 | if revision == 'INITIAL' or self.is_hash_rx.match(revision): |
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| 379 | initial = True |
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| 380 | |
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| 381 | if revision == 'INITIAL': |
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| 382 | cmd = self.repository.command("changes", "--xml-output", |
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| 383 | "--repo", self.repository.repository, |
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| 384 | "--reverse") |
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| 385 | changes = ExternalCommand(command=cmd) |
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| 386 | output = changes.execute(stdout=PIPE, stderr=STDOUT)[0] |
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| 387 | |
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| 388 | if changes.exit_status: |
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| 389 | raise ChangesetApplicationFailure( |
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| 390 | "%s returned status %d saying\n%s" % |
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| 391 | (str(changes), changes.exit_status, |
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| 392 | output and output.read() or '')) |
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| 393 | |
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| 394 | csets = changesets_from_darcschanges(output) |
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| 395 | changeset = csets.next() |
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| 396 | |
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| 397 | revision = 'hash %s' % changeset.darcs_hash |
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| 398 | else: |
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| 399 | revision = 'hash %s' % revision |
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| 400 | else: |
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| 401 | initial = False |
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| 402 | |
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| 403 | if self.repository.subdir == '.' or exists(self.repository.basedir): |
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| 404 | # This is currently *very* slow, compared to the darcs get |
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| 405 | # below! |
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| 406 | if not exists(join(self.repository.basedir, '_darcs')): |
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| 407 | if not exists(self.repository.basedir): |
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| 408 | mkdir(self.repository.basedir) |
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| 409 | |
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| 410 | cmd = self.repository.command("initialize") |
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| 411 | init = ExternalCommand(cwd=self.repository.basedir, command=cmd) |
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| 412 | init.execute() |
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| 413 | |
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| 414 | if init.exit_status: |
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| 415 | raise TargetInitializationFailure( |
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| 416 | "%s returned status %s" % (str(init), |
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| 417 | init.exit_status)) |
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| 418 | |
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| 419 | cmd = self.repository.command("pull", "--all", "--quiet") |
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| 420 | if revision and revision<>'HEAD': |
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| 421 | cmd.extend([initial and "--match" or "--tag", revision]) |
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| 422 | dpull = ExternalCommand(cwd=self.repository.basedir, command=cmd) |
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| 423 | output = dpull.execute(self.repository.repository, |
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| 424 | stdout=PIPE, stderr=STDOUT)[0] |
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| 425 | |
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| 426 | if dpull.exit_status: |
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| 427 | raise TargetInitializationFailure( |
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| 428 | "%s returned status %d saying\n%s" % |
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| 429 | (str(dpull), dpull.exit_status, output.read())) |
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| 430 | else: |
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| 431 | # Use much faster 'darcs get' |
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| 432 | cmd = self.repository.command("get", "--quiet") |
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| 433 | if revision and revision<>'HEAD': |
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| 434 | cmd.extend([initial and "--to-match" or "--tag", revision]) |
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| 435 | else: |
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| 436 | cmd.append("--partial") |
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| 437 | dget = ExternalCommand(command=cmd) |
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| 438 | output = dget.execute(self.repository.repository, self.repository.basedir, |
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| 439 | stdout=PIPE, stderr=STDOUT)[0] |
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| 440 | |
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| 441 | if dget.exit_status: |
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| 442 | raise TargetInitializationFailure( |
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| 443 | "%s returned status %d saying\n%s" % |
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| 444 | (str(dget), dget.exit_status, output.read())) |
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| 445 | |
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| 446 | cmd = self.repository.command("changes", "--last", "1", |
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| 447 | "--xml-output") |
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| 448 | changes = ExternalCommand(cwd=self.repository.basedir, command=cmd) |
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| 449 | output = changes.execute(stdout=PIPE, stderr=STDOUT)[0] |
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| 450 | |
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| 451 | if changes.exit_status: |
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| 452 | raise ChangesetApplicationFailure( |
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| 453 | "%s returned status %d saying\n%s" % |
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| 454 | (str(changes), changes.exit_status, output.read())) |
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| 455 | |
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| 456 | last = changesets_from_darcschanges(output) |
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| 457 | |
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| 458 | return last.next() |
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