Mercurial > hg
view contrib/synthrepo.py @ 17941:9a6e4d5d7ea8
diff: move diffline to patch module
diffline is not part of diff computation, so it makes more sense
to place it with other header generation in patch module.
In upcoming patches we will generalize this approach for
all headers added in the patch, including the git index
header.
author | Guillermo Pérez <bisho@fb.com> |
---|---|
date | Thu, 15 Nov 2012 12:19:03 -0800 |
parents | 0e2846b2482c |
children | 9196638b08ce |
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line source
# synthrepo.py - repo synthesis # # Copyright 2012 Facebook # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. '''synthesize structurally interesting change history This extension is useful for creating a repository with properties that are statistically similar to an existing repository. During analysis, a simple probability table is constructed from the history of an existing repository. During synthesis, these properties are reconstructed. Properties that are analyzed and synthesized include the following: - Lines added or removed when an existing file is modified - Number and sizes of files added - Number of files removed - Line lengths - Topological distance to parent changeset(s) - Probability of a commit being a merge - Probability of a newly added file being added to a new directory - Interarrival time, and time zone, of commits A few obvious properties that are not currently handled realistically: - Merges are treated as regular commits with two parents, which is not realistic - Modifications are not treated as operations on hunks of lines, but as insertions and deletions of randomly chosen single lines - Committer ID (always random) - Executability of files - Symlinks and binary files are ignored ''' import bisect, collections, json, os, random, time from mercurial import cmdutil, context, patch, scmutil, url, util, hg from mercurial.i18n import _ from mercurial.node import nullrev, nullid testedwith = 'internal' cmdtable = {} command = cmdutil.command(cmdtable) newfile = set(('new fi', 'rename', 'copy f', 'copy t')) def zerodict(): return collections.defaultdict(lambda: 0) def roundto(x, k): if x > k * 2: return int(round(x / float(k)) * k) return int(round(x)) def parsegitdiff(lines): filename, mar, lineadd, lineremove = None, None, zerodict(), 0 binary = False for line in lines: start = line[:6] if start == 'diff -': if filename: yield filename, mar, lineadd, lineremove, binary mar, lineadd, lineremove, binary = 'm', zerodict(), 0, False filename = patch.gitre.match(line).group(1) elif start in newfile: mar = 'a' elif start == 'GIT bi': binary = True elif start == 'delete': mar = 'r' elif start: s = start[0] if s == '-' and not line.startswith('--- '): lineremove += 1 elif s == '+' and not line.startswith('+++ '): lineadd[roundto(len(line) - 1, 5)] += 1 if filename: yield filename, mar, lineadd, lineremove, binary @command('analyze', [('o', 'output', [], _('write output to given file'), _('FILE')), ('r', 'rev', [], _('analyze specified revisions'), _('REV'))], _('hg analyze')) def analyze(ui, repo, *revs, **opts): '''create a simple model of a repository to use for later synthesis This command examines every changeset in the given range (or all of history if none are specified) and creates a simple statistical model of the history of the repository. The model is written out to a JSON file, and can be used by :hg:`synthesize` to create or augment a repository with synthetic commits that have a structure that is statistically similar to the analyzed repository. ''' revs = list(revs) revs.extend(opts['rev']) if not revs: revs = [':'] output = opts['output'] if not output: output = os.path.basename(repo.root) + '.json' if output == '-': fp = sys.stdout else: fp = open(output, 'w') revs = scmutil.revrange(repo, revs) revs.sort() lineschanged = zerodict() children = zerodict() p1distance = zerodict() p2distance = zerodict() linesinfilesadded = zerodict() fileschanged = zerodict() filesadded = zerodict() filesremoved = zerodict() linelengths = zerodict() interarrival = zerodict() parents = zerodict() dirsadded = zerodict() tzoffset = zerodict() progress = ui.progress _analyzing = _('analyzing') _changesets = _('changesets') _total = len(revs) for i, rev in enumerate(revs): progress(_analyzing, i, unit=_changesets, total=_total) ctx = repo[rev] pl = ctx.parents() pctx = pl[0] prev = pctx.rev() children[prev] += 1 p1distance[rev - prev] += 1 parents[len(pl)] += 1 tzoffset[ctx.date()[1]] += 1 if len(pl) > 1: p2distance[rev - pl[1].rev()] += 1 if prev == rev - 1: lastctx = pctx else: lastctx = repo[rev - 1] if lastctx.rev() != nullrev: interarrival[roundto(ctx.date()[0] - lastctx.date()[0], 300)] += 1 diff = sum((d.splitlines() for d in ctx.diff(pctx, opts=dict(git=True))), []) fileadds, diradds, fileremoves, filechanges = 0, 0, 0, 0 for filename, mar, lineadd, lineremove, binary in parsegitdiff(diff): if binary: continue added = sum(lineadd.itervalues(), 0) if mar == 'm': if added and lineremove: lineschanged[roundto(added, 5), roundto(lineremove, 5)] += 1 filechanges += 1 elif mar == 'a': fileadds += 1 if '/' in filename: filedir = filename.rsplit('/', 1)[0] if filedir not in pctx.dirs(): diradds += 1 linesinfilesadded[roundto(added, 5)] += 1 elif mar == 'r': fileremoves += 1 for length, count in lineadd.iteritems(): linelengths[length] += count fileschanged[filechanges] += 1 filesadded[fileadds] += 1 dirsadded[diradds] += 1 filesremoved[fileremoves] += 1 invchildren = zerodict() for rev, count in children.iteritems(): invchildren[count] += 1 if output != '-': ui.status(_('writing output to %s\n') % output) def pronk(d): return sorted(d.iteritems(), key=lambda x: x[1], reverse=True) json.dump(dict(revs=len(revs), lineschanged=pronk(lineschanged), children=pronk(invchildren), fileschanged=pronk(fileschanged), filesadded=pronk(filesadded), linesinfilesadded=pronk(linesinfilesadded), dirsadded=pronk(dirsadded), filesremoved=pronk(filesremoved), linelengths=pronk(linelengths), parents=pronk(parents), p1distance=pronk(p1distance), p2distance=pronk(p2distance), interarrival=pronk(interarrival), tzoffset=pronk(tzoffset), ), fp) fp.close() @command('synthesize', [('c', 'count', 0, _('create given number of commits'), _('COUNT')), ('', 'dict', '', _('path to a dictionary of words'), _('FILE'))], _('hg synthesize [OPTION].. DESCFILE')) def synthesize(ui, repo, descpath, **opts): '''synthesize commits based on a model of an existing repository The model must have been generated by :hg:`analyze`. Commits will be generated randomly according to the probabilities described in the model. When synthesizing new content, commit descriptions, and user names, words will be chosen randomly from a dictionary that is presumed to contain one word per line. Use --dict to specify the path to an alternate dictionary to use. ''' try: fp = hg.openpath(ui, descpath) except Exception, err: raise util.Abort('%s: %s' % (descpath, err[0].strerror)) desc = json.load(fp) fp.close() def cdf(l): vals, probs = zip(*sorted(l, key=lambda x: x[1], reverse=True)) t = float(sum(probs, 0)) s, cdfs = 0, [] for v in probs: s += v cdfs.append(s / t) return vals, cdfs lineschanged = cdf(desc['lineschanged']) fileschanged = cdf(desc['fileschanged']) filesadded = cdf(desc['filesadded']) dirsadded = cdf(desc['dirsadded']) filesremoved = cdf(desc['filesremoved']) linelengths = cdf(desc['linelengths']) parents = cdf(desc['parents']) p1distance = cdf(desc['p1distance']) p2distance = cdf(desc['p2distance']) interarrival = cdf(desc['interarrival']) linesinfilesadded = cdf(desc['linesinfilesadded']) tzoffset = cdf(desc['tzoffset']) dictfile = opts.get('dict') or '/usr/share/dict/words' try: fp = open(dictfile, 'rU') except IOError, err: raise util.Abort('%s: %s' % (dictfile, err.strerror)) words = fp.read().splitlines() fp.close() def pick(cdf): return cdf[0][bisect.bisect_left(cdf[1], random.random())] def makeline(minimum=0): total = max(minimum, pick(linelengths)) c, l = 0, [] while c < total: w = random.choice(words) c += len(w) + 1 l.append(w) return ' '.join(l) wlock = repo.wlock() lock = repo.lock() nevertouch = set(('.hgsub', '.hgignore', '.hgtags')) progress = ui.progress _synthesizing = _('synthesizing') _changesets = _('changesets') count = int(opts['count']) heads = set(map(repo.changelog.rev, repo.heads())) for i in xrange(count): progress(_synthesizing, i, unit=_changesets, total=count) node = repo.changelog.node revs = len(repo) def pickhead(heads, distance): if heads: lheads = sorted(heads) rev = revs - min(pick(distance), revs) if rev < lheads[-1]: rev = lheads[bisect.bisect_left(lheads, rev)] else: rev = lheads[-1] return rev, node(rev) return nullrev, nullid r1 = revs - min(pick(p1distance), revs) p1 = node(r1) # the number of heads will grow without bound if we use a pure # model, so artificially constrain their proliferation if pick(parents) == 2 or len(heads) > random.randint(1, 20): r2, p2 = pickhead(heads.difference([r1]), p2distance) else: r2, p2 = nullrev, nullid pl = [p1, p2] pctx = repo[r1] mf = pctx.manifest() mfk = mf.keys() changes = {} if mfk: for __ in xrange(pick(fileschanged)): for __ in xrange(10): fctx = pctx.filectx(random.choice(mfk)) path = fctx.path() if not (path in nevertouch or fctx.isbinary() or 'l' in fctx.flags()): break lines = fctx.data().splitlines() add, remove = pick(lineschanged) for __ in xrange(remove): if not lines: break del lines[random.randrange(0, len(lines))] for __ in xrange(add): lines.insert(random.randint(0, len(lines)), makeline()) path = fctx.path() changes[path] = context.memfilectx(path, '\n'.join(lines) + '\n') for __ in xrange(pick(filesremoved)): path = random.choice(mfk) for __ in xrange(10): path = random.choice(mfk) if path not in changes: changes[path] = None break if filesadded: dirs = list(pctx.dirs()) dirs.append('') for __ in xrange(pick(filesadded)): path = [random.choice(dirs)] if pick(dirsadded): path.append(random.choice(words)) path.append(random.choice(words)) path = '/'.join(filter(None, path)) data = '\n'.join(makeline() for __ in xrange(pick(linesinfilesadded))) + '\n' changes[path] = context.memfilectx(path, data) def filectxfn(repo, memctx, path): data = changes[path] if data is None: raise IOError return data if not changes: continue if revs: date = repo['tip'].date()[0] + pick(interarrival) else: date = time.time() - (86400 * count) user = random.choice(words) + '@' + random.choice(words) mc = context.memctx(repo, pl, makeline(minimum=2), sorted(changes.iterkeys()), filectxfn, user, '%d %d' % (date, pick(tzoffset))) newnode = mc.commit() heads.add(repo.changelog.rev(newnode)) heads.discard(r1) heads.discard(r2) lock.release() wlock.release()