Mercurial > hg
annotate hgext/git/index.py @ 49005:12adf8c695ed
merge: stable into default
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Tue, 05 Apr 2022 11:09:03 +0200 |
parents | 6000f5b25c9b |
children | f4733654f144 |
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1 import collections |
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2 import os |
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3 import sqlite3 |
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4 |
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5 from mercurial.i18n import _ |
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6 from mercurial.node import sha1nodeconstants |
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7 |
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8 from mercurial import ( |
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9 encoding, |
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10 error, |
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11 pycompat, |
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12 ) |
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13 |
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14 from . import gitutil |
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15 |
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16 |
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17 pygit2 = gitutil.get_pygit2() |
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18 |
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19 _CURRENT_SCHEMA_VERSION = 1 |
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20 _SCHEMA = ( |
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21 """ |
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22 CREATE TABLE refs ( |
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23 -- node and name are unique together. There may be more than one name for |
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24 -- a given node, and there may be no name at all for a given node (in the |
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25 -- case of an anonymous hg head). |
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26 node TEXT NOT NULL, |
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27 name TEXT |
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28 ); |
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29 |
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30 -- The "possible heads" of the repository, which we use to figure out |
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31 -- if we need to re-walk the changelog. |
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32 CREATE TABLE possible_heads ( |
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33 node TEXT NOT NULL |
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34 ); |
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35 |
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36 -- The topological heads of the changelog, which hg depends on. |
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37 CREATE TABLE heads ( |
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38 node TEXT NOT NULL |
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39 ); |
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40 |
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41 -- A total ordering of the changelog |
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42 CREATE TABLE changelog ( |
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43 rev INTEGER NOT NULL PRIMARY KEY, |
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44 node TEXT NOT NULL, |
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45 p1 TEXT, |
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46 p2 TEXT |
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47 ); |
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48 |
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49 CREATE UNIQUE INDEX changelog_node_idx ON changelog(node); |
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50 CREATE UNIQUE INDEX changelog_node_rev_idx ON changelog(rev, node); |
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51 |
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52 -- Changed files for each commit, which lets us dynamically build |
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53 -- filelogs. |
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54 CREATE TABLE changedfiles ( |
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55 node TEXT NOT NULL, |
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56 filename TEXT NOT NULL, |
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57 -- 40 zeroes for deletions |
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58 filenode TEXT NOT NULL, |
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59 -- to handle filelog parentage: |
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60 p1node TEXT, |
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61 p1filenode TEXT, |
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62 p2node TEXT, |
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63 p2filenode TEXT |
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64 ); |
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65 |
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66 CREATE INDEX changedfiles_nodes_idx |
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67 ON changedfiles(node); |
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68 |
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69 PRAGMA user_version=%d |
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70 """ |
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71 % _CURRENT_SCHEMA_VERSION |
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72 ) |
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73 |
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74 |
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75 def _createdb(path): |
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76 # print('open db', path) |
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77 # import traceback |
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78 # traceback.print_stack() |
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79 db = sqlite3.connect(encoding.strfromlocal(path)) |
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80 db.text_factory = bytes |
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81 |
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82 res = db.execute('PRAGMA user_version').fetchone()[0] |
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83 |
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84 # New database. |
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85 if res == 0: |
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86 for statement in _SCHEMA.split(';'): |
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87 db.execute(statement.strip()) |
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88 |
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89 db.commit() |
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90 |
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91 elif res == _CURRENT_SCHEMA_VERSION: |
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92 pass |
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93 |
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94 else: |
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95 raise error.Abort(_(b'sqlite database has unrecognized version')) |
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96 |
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97 db.execute('PRAGMA journal_mode=WAL') |
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98 |
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99 return db |
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100 |
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101 |
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102 _OUR_ORDER = () |
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103 if pygit2: |
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104 _OUR_ORDER = ( |
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105 pygit2.GIT_SORT_TOPOLOGICAL |
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106 | pygit2.GIT_SORT_TIME |
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107 | pygit2.GIT_SORT_REVERSE |
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108 ) |
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109 |
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110 _DIFF_FLAGS = 1 << 21 # GIT_DIFF_FORCE_BINARY, which isn't exposed by pygit2 |
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111 |
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112 |
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113 def _find_nearest_ancestor_introducing_node( |
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114 db, gitrepo, file_path, walk_start, filenode |
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115 ): |
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116 """Find the nearest ancestor that introduces a file node. |
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117 |
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118 Args: |
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119 db: a handle to our sqlite database. |
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120 gitrepo: A pygit2.Repository instance. |
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121 file_path: the path of a file in the repo |
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122 walk_start: a pygit2.Oid that is a commit where we should start walking |
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123 for our nearest ancestor. |
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124 |
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125 Returns: |
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126 A hexlified SHA that is the commit ID of the next-nearest parent. |
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127 """ |
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128 assert isinstance(file_path, str), 'file_path must be str, got %r' % type( |
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129 file_path |
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130 ) |
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131 assert isinstance(filenode, str), 'filenode must be str, got %r' % type( |
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132 filenode |
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133 ) |
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134 parent_options = { |
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135 row[0].decode('ascii') |
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136 for row in db.execute( |
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137 'SELECT node FROM changedfiles ' |
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138 'WHERE filename = ? AND filenode = ?', |
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139 (file_path, filenode), |
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140 ) |
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141 } |
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142 inner_walker = gitrepo.walk(walk_start, _OUR_ORDER) |
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143 for w in inner_walker: |
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144 if w.id.hex in parent_options: |
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145 return w.id.hex |
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146 raise error.ProgrammingError( |
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147 'Unable to find introducing commit for %s node %s from %s', |
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148 (file_path, filenode, walk_start), |
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149 ) |
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150 |
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151 |
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152 def fill_in_filelog(gitrepo, db, startcommit, path, startfilenode): |
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153 """Given a starting commit and path, fill in a filelog's parent pointers. |
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154 |
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155 Args: |
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156 gitrepo: a pygit2.Repository |
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157 db: a handle to our sqlite database |
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158 startcommit: a hexlified node id for the commit to start at |
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159 path: the path of the file whose parent pointers we should fill in. |
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160 filenode: the hexlified node id of the file at startcommit |
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161 |
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162 TODO: make filenode optional |
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163 """ |
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164 assert isinstance( |
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165 startcommit, str |
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166 ), 'startcommit must be str, got %r' % type(startcommit) |
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167 assert isinstance( |
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168 startfilenode, str |
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169 ), 'startfilenode must be str, got %r' % type(startfilenode) |
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170 visit = collections.deque([(startcommit, startfilenode)]) |
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171 while visit: |
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172 cnode, filenode = visit.popleft() |
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173 commit = gitrepo[cnode] |
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174 parents = [] |
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175 for parent in commit.parents: |
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176 t = parent.tree |
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177 for comp in path.split('/'): |
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178 try: |
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179 t = gitrepo[t[comp].id] |
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180 except KeyError: |
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181 break |
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182 else: |
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183 introducer = _find_nearest_ancestor_introducing_node( |
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184 db, gitrepo, path, parent.id, t.id.hex |
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185 ) |
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186 parents.append((introducer, t.id.hex)) |
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187 p1node = p1fnode = p2node = p2fnode = gitutil.nullgit |
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188 for par, parfnode in parents: |
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189 found = int( |
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190 db.execute( |
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191 'SELECT COUNT(*) FROM changedfiles WHERE ' |
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192 'node = ? AND filename = ? AND filenode = ? AND ' |
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193 'p1node NOT NULL', |
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194 (par, path, parfnode), |
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195 ).fetchone()[0] |
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196 ) |
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197 if found == 0: |
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198 assert par is not None |
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199 visit.append((par, parfnode)) |
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200 if parents: |
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201 p1node, p1fnode = parents[0] |
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202 if len(parents) == 2: |
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203 p2node, p2fnode = parents[1] |
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204 if len(parents) > 2: |
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205 raise error.ProgrammingError( |
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206 b"git support can't handle octopus merges" |
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207 ) |
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208 db.execute( |
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209 'UPDATE changedfiles SET ' |
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210 'p1node = ?, p1filenode = ?, p2node = ?, p2filenode = ? ' |
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211 'WHERE node = ? AND filename = ? AND filenode = ?', |
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212 (p1node, p1fnode, p2node, p2fnode, commit.id.hex, path, filenode), |
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213 ) |
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214 db.commit() |
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215 |
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216 |
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217 def _index_repo( |
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218 gitrepo, |
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219 db, |
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220 logfn=lambda x: None, |
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221 progress_factory=lambda *args, **kwargs: None, |
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222 ): |
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223 # Identify all references so we can tell the walker to visit all of them. |
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224 all_refs = gitrepo.listall_references() |
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225 possible_heads = set() |
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226 prog = progress_factory(b'refs') |
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227 for pos, ref in enumerate(all_refs): |
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228 if prog is not None: |
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229 prog.update(pos) |
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230 if not ( |
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231 ref.startswith('refs/heads/') # local branch |
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232 or ref.startswith('refs/tags/') # tag |
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233 or ref.startswith('refs/remotes/') # remote branch |
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234 or ref.startswith('refs/hg/') # from this extension |
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235 ): |
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236 continue |
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237 try: |
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238 start = gitrepo.lookup_reference(ref).peel(pygit2.GIT_OBJ_COMMIT) |
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239 except ValueError: |
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240 # No commit to be found, so we don't care for hg's purposes. |
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241 continue |
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242 possible_heads.add(start.id) |
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243 # Optimization: if the list of heads hasn't changed, don't |
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244 # reindex, the changelog. This doesn't matter on small |
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245 # repositories, but on even moderately deep histories (eg cpython) |
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246 # this is a very important performance win. |
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247 # |
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248 # TODO: we should figure out how to incrementally index history |
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249 # (preferably by detecting rewinds!) so that we don't have to do a |
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250 # full changelog walk every time a new commit is created. |
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251 cache_heads = { |
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252 pycompat.sysstr(x[0]) |
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253 for x in db.execute('SELECT node FROM possible_heads') |
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254 } |
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255 walker = None |
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256 cur_cache_heads = {h.hex for h in possible_heads} |
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257 if cur_cache_heads == cache_heads: |
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258 return |
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259 logfn(b'heads mismatch, rebuilding dagcache\n') |
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260 for start in possible_heads: |
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261 if walker is None: |
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262 walker = gitrepo.walk(start, _OUR_ORDER) |
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263 else: |
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264 walker.push(start) |
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265 |
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266 # Empty out the existing changelog. Even for large-ish histories |
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267 # we can do the top-level "walk all the commits" dance very |
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268 # quickly as long as we don't need to figure out the changed files |
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269 # list. |
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270 db.execute('DELETE FROM changelog') |
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271 if prog is not None: |
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272 prog.complete() |
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273 prog = progress_factory(b'commits') |
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274 # This walker is sure to visit all the revisions in history, but |
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275 # only once. |
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276 for pos, commit in enumerate(walker): |
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277 if prog is not None: |
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278 prog.update(pos) |
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279 p1 = p2 = gitutil.nullgit |
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280 if len(commit.parents) > 2: |
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281 raise error.ProgrammingError( |
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282 ( |
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283 b"git support can't handle octopus merges, " |
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284 b"found a commit with %d parents :(" |
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285 ) |
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286 % len(commit.parents) |
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287 ) |
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288 if commit.parents: |
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289 p1 = commit.parents[0].id.hex |
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290 if len(commit.parents) == 2: |
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291 p2 = commit.parents[1].id.hex |
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292 db.execute( |
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293 'INSERT INTO changelog (rev, node, p1, p2) VALUES(?, ?, ?, ?)', |
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294 (pos, commit.id.hex, p1, p2), |
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295 ) |
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296 |
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297 num_changedfiles = db.execute( |
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298 "SELECT COUNT(*) from changedfiles WHERE node = ?", |
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299 (commit.id.hex,), |
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300 ).fetchone()[0] |
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301 if not num_changedfiles: |
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302 files = {} |
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303 # I *think* we only need to check p1 for changed files |
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304 # (and therefore linkrevs), because any node that would |
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305 # actually have this commit as a linkrev would be |
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306 # completely new in this rev. |
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307 p1 = commit.parents[0].id.hex if commit.parents else None |
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308 if p1 is not None: |
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309 patchgen = gitrepo.diff(p1, commit.id.hex, flags=_DIFF_FLAGS) |
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310 else: |
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311 patchgen = commit.tree.diff_to_tree( |
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312 swap=True, flags=_DIFF_FLAGS |
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313 ) |
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314 new_files = (p.delta.new_file for p in patchgen) |
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315 files = { |
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316 nf.path: nf.id.hex |
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317 for nf in new_files |
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318 if nf.id.raw != sha1nodeconstants.nullid |
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319 } |
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320 for p, n in files.items(): |
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321 # We intentionally set NULLs for any file parentage |
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322 # information so it'll get demand-computed later. We |
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323 # used to do it right here, and it was _very_ slow. |
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324 db.execute( |
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325 'INSERT INTO changedfiles (' |
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326 'node, filename, filenode, p1node, p1filenode, p2node, ' |
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327 'p2filenode) VALUES(?, ?, ?, ?, ?, ?, ?)', |
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328 (commit.id.hex, p, n, None, None, None, None), |
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329 ) |
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330 db.execute('DELETE FROM heads') |
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331 db.execute('DELETE FROM possible_heads') |
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332 for hid in possible_heads: |
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333 h = hid.hex |
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334 db.execute('INSERT INTO possible_heads (node) VALUES(?)', (h,)) |
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335 haschild = db.execute( |
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336 'SELECT COUNT(*) FROM changelog WHERE p1 = ? OR p2 = ?', (h, h) |
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337 ).fetchone()[0] |
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338 if not haschild: |
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339 db.execute('INSERT INTO heads (node) VALUES(?)', (h,)) |
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340 |
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341 db.commit() |
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342 if prog is not None: |
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343 prog.complete() |
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344 |
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345 |
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346 def get_index( |
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347 gitrepo, logfn=lambda x: None, progress_factory=lambda *args, **kwargs: None |
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348 ): |
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349 cachepath = os.path.join( |
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350 pycompat.fsencode(gitrepo.path), b'..', b'.hg', b'cache' |
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351 ) |
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352 if not os.path.exists(cachepath): |
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353 os.makedirs(cachepath) |
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354 dbpath = os.path.join(cachepath, b'git-commits.sqlite') |
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355 db = _createdb(dbpath) |
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356 # TODO check against gitrepo heads before doing a full index |
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357 # TODO thread a ui.progress call into this layer |
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358 _index_repo(gitrepo, db, logfn, progress_factory) |
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359 return db |