author | Pierre-Yves David <pierre-yves.david@logilab.fr> |
Thu, 10 Jan 2013 18:59:37 +0100 | |
changeset 18404 | 1da84a6b136a |
parent 17424 | e7cfe3587ea4 |
child 19108 | cb95716da5fe |
permissions | -rw-r--r-- |
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# tags.py - read tag info from local repository |
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# |
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# Copyright 2009 Matt Mackall <mpm@selenic.com> |
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# Copyright 2009 Greg Ward <greg@gerg.ca> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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|
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# Currently this module only deals with reading and caching tags. |
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# Eventually, it could take care of updating (adding/removing/moving) |
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# tags too. |
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|
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from node import nullid, bin, hex, short |
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from i18n import _ |
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import encoding |
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import error |
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import errno |
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def findglobaltags(ui, repo, alltags, tagtypes): |
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'''Find global tags in repo by reading .hgtags from every head that |
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has a distinct version of it, using a cache to avoid excess work. |
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Updates the dicts alltags, tagtypes in place: alltags maps tag name |
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to (node, hist) pair (see _readtags() below), and tagtypes maps tag |
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name to tag type ("global" in this case).''' |
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# This is so we can be lazy and assume alltags contains only global |
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# tags when we pass it to _writetagcache(). |
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assert len(alltags) == len(tagtypes) == 0, \ |
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"findglobaltags() should be called first" |
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|
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(heads, tagfnode, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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if cachetags is not None: |
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assert not shouldwrite |
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# XXX is this really 100% correct? are there oddball special |
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# cases where a global tag should outrank a local tag but won't, |
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# because cachetags does not contain rank info? |
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_updatetags(cachetags, 'global', alltags, tagtypes) |
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return |
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seen = set() # set of fnode |
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fctx = None |
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for head in reversed(heads): # oldest to newest |
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assert head in repo.changelog.nodemap, \ |
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"tag cache returned bogus head %s" % short(head) |
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fnode = tagfnode.get(head) |
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if fnode and fnode not in seen: |
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seen.add(fnode) |
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if not fctx: |
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fctx = repo.filectx('.hgtags', fileid=fnode) |
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else: |
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fctx = fctx.filectx(fnode) |
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filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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_updatetags(filetags, 'global', alltags, tagtypes) |
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# and update the cache (if necessary) |
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if shouldwrite: |
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_writetagcache(ui, repo, heads, tagfnode, alltags) |
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def readlocaltags(ui, repo, alltags, tagtypes): |
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'''Read local tags in repo. Update alltags and tagtypes.''' |
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try: |
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data = repo.opener.read("localtags") |
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except IOError, inst: |
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if inst.errno != errno.ENOENT: |
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raise |
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return |
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|
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# localtags is in the local encoding; re-encode to UTF-8 on |
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# input for consistency with the rest of this module. |
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filetags = _readtags( |
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ui, repo, data.splitlines(), "localtags", |
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recode=encoding.fromlocal) |
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_updatetags(filetags, "local", alltags, tagtypes) |
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|
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def _readtags(ui, repo, lines, fn, recode=None): |
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'''Read tag definitions from a file (or any source of lines). |
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Return a mapping from tag name to (node, hist): node is the node id |
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from the last line read for that name, and hist is the list of node |
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ids previously associated with it (in file order). All node ids are |
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binary, not hex.''' |
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filetags = {} # map tag name to (node, hist) |
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count = 0 |
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|
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def warn(msg): |
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ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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|
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for line in lines: |
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count += 1 |
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if not line: |
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continue |
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try: |
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(nodehex, name) = line.split(" ", 1) |
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except ValueError: |
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warn(_("cannot parse entry")) |
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continue |
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name = name.strip() |
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if recode: |
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name = recode(name) |
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try: |
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nodebin = bin(nodehex) |
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except TypeError: |
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warn(_("node '%s' is not well formed") % nodehex) |
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continue |
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|
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# update filetags |
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hist = [] |
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if name in filetags: |
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n, hist = filetags[name] |
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hist.append(n) |
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filetags[name] = (nodebin, hist) |
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return filetags |
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def _updatetags(filetags, tagtype, alltags, tagtypes): |
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'''Incorporate the tag info read from one file into the two |
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dictionaries, alltags and tagtypes, that contain all tag |
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info (global across all heads plus local).''' |
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119 |
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for name, nodehist in filetags.iteritems(): |
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if name not in alltags: |
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alltags[name] = nodehist |
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tagtypes[name] = tagtype |
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124 |
continue |
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125 |
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# we prefer alltags[name] if: |
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# it supersedes us OR |
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# mutual supersedes and it has a higher rank |
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# otherwise we win because we're tip-most |
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anode, ahist = nodehist |
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bnode, bhist = alltags[name] |
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if (bnode != anode and anode in bhist and |
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(bnode not in ahist or len(bhist) > len(ahist))): |
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anode = bnode |
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ahist.extend([n for n in bhist if n not in ahist]) |
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alltags[name] = anode, ahist |
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tagtypes[name] = tagtype |
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138 |
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139 |
|
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# The tag cache only stores info about heads, not the tag contents |
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# from each head. I.e. it doesn't try to squeeze out the maximum |
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# performance, but is simpler has a better chance of actually |
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143 |
# working correctly. And this gives the biggest performance win: it |
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# avoids looking up .hgtags in the manifest for every head, and it |
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145 |
# can avoid calling heads() at all if there have been no changes to |
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146 |
# the repo. |
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147 |
|
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148 |
def _readtagcache(ui, repo): |
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'''Read the tag cache and return a tuple (heads, fnodes, cachetags, |
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150 |
shouldwrite). If the cache is completely up-to-date, cachetags is a |
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151 |
dict of the form returned by _readtags(); otherwise, it is None and |
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152 |
heads and fnodes are set. In that case, heads is the list of all |
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153 |
heads currently in the repository (ordered from tip to oldest) and |
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fnodes is a mapping from head to .hgtags filenode. If those two are |
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155 |
set, caller is responsible for reading tag info from each head.''' |
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156 |
|
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157 |
try: |
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cachefile = repo.opener('cache/tags', 'r') |
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# force reading the file for static-http |
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cachelines = iter(cachefile) |
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161 |
except IOError: |
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cachefile = None |
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163 |
|
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164 |
# The cache file consists of lines like |
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165 |
# <headrev> <headnode> [<tagnode>] |
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166 |
# where <headrev> and <headnode> redundantly identify a repository |
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167 |
# head from the time the cache was written, and <tagnode> is the |
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168 |
# filenode of .hgtags on that head. Heads with no .hgtags file will |
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# have no <tagnode>. The cache is ordered from tip to oldest (which |
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# is part of why <headrev> is there: a quick visual check is all |
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171 |
# that's required to ensure correct order). |
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172 |
# |
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173 |
# This information is enough to let us avoid the most expensive part |
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174 |
# of finding global tags, which is looking up <tagnode> in the |
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175 |
# manifest for each head. |
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176 |
cacherevs = [] # list of headrev |
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177 |
cacheheads = [] # list of headnode |
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cachefnode = {} # map headnode to filenode |
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179 |
if cachefile: |
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try: |
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181 |
for line in cachelines: |
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182 |
if line == "\n": |
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183 |
break |
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184 |
line = line.split() |
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185 |
cacherevs.append(int(line[0])) |
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186 |
headnode = bin(line[1]) |
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187 |
cacheheads.append(headnode) |
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188 |
if len(line) == 3: |
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189 |
fnode = bin(line[2]) |
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190 |
cachefnode[headnode] = fnode |
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191 |
except Exception: |
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192 |
# corruption of the tags cache, just recompute it |
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193 |
ui.warn(_('.hg/cache/tags is corrupt, rebuilding it\n')) |
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194 |
cacheheads = [] |
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195 |
cacherevs = [] |
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196 |
cachefnode = {} |
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197 |
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198 |
tipnode = repo.changelog.tip() |
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199 |
tiprev = len(repo.changelog) - 1 |
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200 |
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201 |
# Case 1 (common): tip is the same, so nothing has changed. |
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202 |
# (Unchanged tip trivially means no changesets have been added. |
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203 |
# But, thanks to localrepository.destroyed(), it also means none |
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204 |
# have been destroyed by strip or rollback.) |
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205 |
if cacheheads and cacheheads[0] == tipnode and cacherevs[0] == tiprev: |
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206 |
tags = _readtags(ui, repo, cachelines, cachefile.name) |
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207 |
cachefile.close() |
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208 |
return (None, None, tags, False) |
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if cachefile: |
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cachefile.close() # ignore rest of file |
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211 |
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repoheads = repo.heads() |
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213 |
# Case 2 (uncommon): empty repo; get out quickly and don't bother |
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# writing an empty cache. |
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215 |
if repoheads == [nullid]: |
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216 |
return ([], {}, {}, False) |
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217 |
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# Case 3 (uncommon): cache file missing or empty. |
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219 |
|
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# Case 4 (uncommon): tip rev decreased. This should only happen |
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# when we're called from localrepository.destroyed(). Refresh the |
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# cache so future invocations will not see disappeared heads in the |
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# cache. |
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# Case 5 (common): tip has changed, so we've added/replaced heads. |
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# As it happens, the code to handle cases 3, 4, 5 is the same. |
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# N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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# exposed". |
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if not len(repo.file('.hgtags')): |
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# No tags have ever been committed, so we can avoid a |
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# potentially expensive search. |
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return (repoheads, cachefnode, None, True) |
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newheads = [head |
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for head in repoheads |
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if head not in set(cacheheads)] |
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|
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# Now we have to lookup the .hgtags filenode for every new head. |
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# This is the most expensive part of finding tags, so performance |
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# depends primarily on the size of newheads. Worst case: no cache |
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# file, so newheads == repoheads. |
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for head in reversed(newheads): |
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cctx = repo[head] |
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try: |
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fnode = cctx.filenode('.hgtags') |
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cachefnode[head] = fnode |
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except error.LookupError: |
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# no .hgtags file on this head |
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pass |
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# Caller has to iterate over all heads, but can use the filenodes in |
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# cachefnode to get to each .hgtags revision quickly. |
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return (repoheads, cachefnode, None, True) |
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def _writetagcache(ui, repo, heads, tagfnode, cachetags): |
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|
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try: |
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cachefile = repo.opener('cache/tags', 'w', atomictemp=True) |
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except (OSError, IOError): |
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return |
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263 |
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realheads = repo.heads() # for sanity checks below |
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for head in heads: |
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# temporary sanity checks; these can probably be removed |
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# once this code has been in crew for a few weeks |
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assert head in repo.changelog.nodemap, \ |
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'trying to write non-existent node %s to tag cache' % short(head) |
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assert head in realheads, \ |
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271 |
'trying to write non-head %s to tag cache' % short(head) |
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assert head != nullid, \ |
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273 |
'trying to write nullid to tag cache' |
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274 |
|
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# This can't fail because of the first assert above. When/if we |
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# remove that assert, we might want to catch LookupError here |
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# and downgrade it to a warning. |
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rev = repo.changelog.rev(head) |
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279 |
|
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fnode = tagfnode.get(head) |
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if fnode: |
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cachefile.write('%d %s %s\n' % (rev, hex(head), hex(fnode))) |
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283 |
else: |
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cachefile.write('%d %s\n' % (rev, hex(head))) |
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285 |
|
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# Tag names in the cache are in UTF-8 -- which is the whole reason |
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# we keep them in UTF-8 throughout this module. If we converted |
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# them local encoding on input, we would lose info writing them to |
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# the cache. |
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cachefile.write('\n') |
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291 |
for (name, (node, hist)) in cachetags.iteritems(): |
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292 |
cachefile.write("%s %s\n" % (hex(node), name)) |
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293 |
|
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294 |
try: |
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295 |
cachefile.close() |
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296 |
except (OSError, IOError): |
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297 |
pass |