New script: repo-bisect
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#!/usr/bin/python
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import os
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import sys
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import getopt
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import subprocess
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import urllib2
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import json
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import re
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import datetime
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import xml.etree.ElementTree as ElementTree
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cfg = dict()
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cfg['verbose'] = 0
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cfg['nosync'] = False
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def verbose(s):
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if cfg['verbose'] > 0:
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sys.stderr.write(s)
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def date_from_string(s):
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ymd = s.split('-')
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return datetime.datetime(int(ymd[0]), int(ymd[1]), int(ymd[2]))
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def git_config(key):
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args = ['git', 'config', key]
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child = subprocess.Popen(args, stdin=None, stdout=subprocess.PIPE, stderr=None)
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out, err = child.communicate()
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if child.returncode != 0:
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sys.stderr.write('Failed to read git config\n')
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sys.exit(1)
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return out.strip()
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def git_reset_hard(rev):
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args = ['git', 'reset', '--hard', rev]
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child = subprocess.Popen(args, stdin=None, stdout=subprocess.PIPE, stderr=None)
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out, err = child.communicate()
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if child.returncode != 0:
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sys.stderr.write('Failed to read git log\n')
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sys.exit(1)
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def git_checkout(rev):
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args = ['git', 'checkout', rev]
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child = subprocess.Popen(args, stdin=None, stdout=subprocess.PIPE, stderr=None)
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out, err = child.communicate()
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if child.returncode != 0:
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sys.stderr.write('Failed to read git log\n')
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sys.exit(1)
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def git_rev_by_date(date, branch):
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args = ['git', 'rev-list', '--max-count=1']
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args.append('--until=%s' % (date))
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args.append(branch)
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child = subprocess.Popen(args, stdin=None, stdout=subprocess.PIPE, stderr=None)
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out, err = child.communicate()
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if child.returncode != 0:
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sys.stderr.write('Failed to read git log\n')
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sys.exit(1)
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if not out:
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sys.stderr.write('Failed to find rev')
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sys.exit(1)
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return out.strip()
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def repo_manifest():
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args = []
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args.append('repo')
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args.append('manifest')
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child = subprocess.Popen(args, stdin=None, stdout=subprocess.PIPE, stderr=None)
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out, err = child.communicate()
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if child.returncode != 0:
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sys.stderr.write('Failed to read manifest\n')
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sys.exit(1)
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return ElementTree.fromstring(out)
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def repo_sync_to_date(date):
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print "bisect: sync to %s" % (state['start'])
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# Set manifest revision
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os.chdir('.repo/manifests')
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remote = git_config('branch.default.remote')
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branch = git_config('branch.default.merge')
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rev = git_rev_by_date(date, '%s/%s' % (remote, branch))
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print "rev at %s = %s" % (date, rev)
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git_reset_hard(rev)
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os.chdir(cwd)
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# Fetch the manifest
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manifest = repo_manifest()
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# Find default remote and revision
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for elem in manifest.findall('default'):
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def_remote = elem.get('remote')
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def_revision = elem.get('revision')
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if def_revision.startswith('refs/heads/'):
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# refs/heads/branch => branch
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def_revision = def_revision.split('/')[2]
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# Update manifest revisions
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for elem in manifest.findall('project'):
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project_name = elem.get('name')
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project_path = elem.get('path', project_name)
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os.chdir(project_path)
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project_remote = elem.get('remote', def_remote)
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project_revision = elem.get('revision', def_revision)
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if project_revision.startswith('refs/tags'):
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manifest_revision = project_revision.split('/')[2]
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else:
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manifest_revision = "%s/%s" % (project_remote, project_revision)
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rev = git_rev_by_date(date, manifest_revision)
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elem.set('revision', rev)
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os.chdir(cwd)
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# Write new manifest
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pathname = "%s/.repo/manifests/bisect-%s.xml" % (cwd, date)
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ElementTree.ElementTree(manifest).write(pathname)
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# Sync
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have_local = os.path.exists('.repo/local_manifests')
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if have_local:
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os.rename('.repo/local_manifests', '.repo/local_manifests.hide')
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args = ['repo', 'sync', '-l', '-m', pathname]
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child = subprocess.Popen(args, stdin=None, stdout=subprocess.PIPE, stderr=None)
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out, err = child.communicate()
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if child.returncode != 0:
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sys.stderr.write('Failed to sync\n')
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if have_local:
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os.rename('.repo/local_manifests.hide', '.repo/local_manifests')
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def state_read():
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s = dict()
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f = open('.repo/bisect', 'r')
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for line in f:
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k,v = line.strip().split('=')
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s[k] = v
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f.close()
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return s
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def state_write(s):
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f = open('.repo/bisect', 'w')
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f.write("start=%s\n" % (s['start']))
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f.write("end=%s\n" % (s['end']))
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f.close()
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def state_delete():
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os.unlink('.repo/bisect')
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def usage():
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print "Usage:"
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print " repo-bisect [args] start yyyy-mm-dd yyyy-mm-dd"
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print " repo-bisect [args] <good|bad|reset>"
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print " --verbose Increase verbose level"
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sys.exit(1)
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optargs, argv = getopt.getopt(sys.argv[1:], 'v',
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['verbose', 'nosync'])
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for k, v in optargs:
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if k in ('-n', '--nosync'):
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cfg['nosync'] = True
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if k in ('-v', '--verbose'):
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cfg['verbose'] += 1
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cwd = os.getcwd()
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if not os.path.exists('.repo'):
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sys.stderr.write("Not a repo\n")
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sys.exit(1)
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if len(argv) < 1:
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usage()
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action = argv[0]
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if action == 'start':
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if len(argv) < 3:
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usage()
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state = dict()
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state['start'] = argv[1]
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state['end'] = argv[2]
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state_write(state)
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if not cfg['nosync']:
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repo_sync_to_date(state['start'])
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if action == 'good':
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state = state_read()
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d1 = date_from_string(state['start'])
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d2 = date_from_string(state['end'])
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delta = (d2 - d1) / 2
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if delta.days < 1:
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print "No more dates left to test"
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sys.exit(0)
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mid = d1 + delta
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state['start'] = "%s-%s-%s" % (mid.year, mid.month, mid.day)
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state_write(state)
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print "bisect: start=%s, end=%s" % (state['start'], state['end'])
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if not cfg['nosync']:
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repo_sync_to_date(state['start'])
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if action == 'bad':
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state = state_read()
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d1 = date_from_string(state['start'])
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d2 = date_from_string(state['end'])
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delta = (d2 - d1) / 2
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if delta.days < 1:
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print "No more dates left to test"
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sys.exit(0)
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mid = d1 + delta
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state['end'] = "%s-%s-%s" % (mid.year, mid.month, mid.day)
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state_write(state)
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print "bisect: start=%s, end=%s" % (state['start'], state['end'])
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if not cfg['nosync']:
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repo_sync_to_date(state['start'])
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if action == 'reset':
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state_delete()
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sys.exit(0)
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