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#!/usr/bin/env python
#
# Copyright (C) 2012 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Remove directories in /src/cache/gits that aren't used in any morphologies.
# Stale directories can occur as a result of switching a chunk from upstream
# git to a lorried repo, or from large scale URI changes.
import glob
import json
import logging
import os
import re
import shutil
import string
import subprocess
import cliapp
### Copied and pasted from morphlib/repoaliasresolver.py !!!
class RepoAliasResolver(object):
def __init__(self, aliases):
self.aliases = aliases
def pull_url(self, reponame):
'''Expand a possibly shortened repo name to a pull url.'''
return self._expand_reponame(reponame, 'pullpat')
def push_url(self, reponame):
'''Expand a possibly shortened repo name to a push url.'''
return self._expand_reponame(reponame, 'pushpat')
def _expand_reponame(self, reponame, patname):
logging.debug('expanding: reponame=%s' % reponame)
logging.debug('expanding: patname=%s' % patname)
prefix, suffix = self._split_reponame(reponame)
logging.debug('expanding: prefix=%s' % prefix)
logging.debug('expanding: suffix=%s' % suffix)
# There was no prefix.
if prefix is None:
logging.debug('expanding: no prefix')
return reponame
pat = r'^(?P<prefix>[a-z0-9]+)=(?P<pullpat>[^#]+)#(?P<pushpat>[^#]+)$'
for alias in self.aliases:
logging.debug('expanding: alias="%s"' % alias)
m = re.match(pat, alias)
logging.debug('expanding: m=%s' % repr(m))
if m:
logging.debug('expanding: prefix group=%s' % m.group('prefix'))
if m and m.group('prefix') == prefix:
pullpat = m.group(patname)
logging.debug('expanding: pullpat=%s' % pullpat)
return self._apply_url_pattern(pullpat, suffix)
# Unknown prefix. Which means it may be a real URL instead.
# Let the caller deal with it.
logging.debug('expanding: unknown prefix')
return reponame
def _split_reponame(self, reponame):
'''Split reponame into prefix and suffix.
The prefix is returned as None if there was no prefix.
'''
pat = r'^(?P<prefix>[a-z0-9]+):(?P<rest>.*)$'
m = re.match(pat, reponame)
if m:
return m.group('prefix'), m.group('rest')
else:
return None, reponame
def _apply_url_pattern(self, pattern, shortname):
if '%s' in pattern:
return shortname.join(pattern.split('%s'))
else:
return pattern + shortname
### Copied and pasted from morph/morphlib/localrepocache.py !!!
def quote_url(url):
''' Convert URIs to strings that only contain digits, letters, % and _.
NOTE: When changing the code of this function, make sure to also apply
the same to the quote_url() function of lorry. Otherwise the git tarballs
generated by lorry may no longer be found by morph.
'''
valid_chars = string.digits + string.letters + '%_'
transl = lambda x: x if x in valid_chars else '_'
return ''.join([transl(x) for x in url])
###
class CleanGitCache(cliapp.Application):
def add_settings(self):
self.settings.boolean(['remove', 'r'],
'don\'t just list unused gits, remove them too')
def process_inputs(self, args):
morph = os.environ.get('MORPH', 'morph')
if len(args) != 2:
print "Usage: clean-git-cache REPO BRANCH"
print
print "For example: clean-git-cache baserock:baserock/morphs master"
print
print "This will detect any repositories that are not referenced "
print "by the morphologies available in that repo/branch."
return
print "Reading default config from '%s'" % morph
print
if morph == 'morph':
print "Note: if you use Morph from a git checkout instead of the "
print "systemwide version, set MORPH in the environment to point "
print "to that version or you may remove the wrong things, due to "
print "out of date configuration."
print
config = self.runcmd ([morph, '--dump-config'])
cache_dir = re.search('cachedir = (.*)', config).group(1)
repo_alias = re.search('repo-alias = (.*)', config).group(1)
repo_alias = repo_alias.split(', ')
self.resolver = RepoAliasResolver(repo_alias)
morphs_repo = args[0]
morphs_branch = args[1]
git_cache_dir = os.path.join(cache_dir, 'gits')
unused_gits = self._get_unused_gits(morphs_repo,
morphs_branch,
git_cache_dir)
if unused_gits == []:
print "No unused git repos found."
elif self.settings['remove']:
print "Removing unused git repositories ..."
for git in unused_gits:
f = os.path.join(git_cache_dir, git)
print f
shutil.rmtree(f)
else:
print "Unused gits:"
for git in unused_gits:
f = os.path.join(git_cache_dir, git)
#size = self.runcmd(['du', '-sh', f])
print f
print
print "Run again with --remove to delete these repository caches."
def _get_unused_gits(self, morphs_repo, morphs_branch, git_cache_dir):
morphs_repo = self.resolver.pull_url(morphs_repo)
morphs_dir = os.path.join(git_cache_dir, quote_url(morphs_repo))
refs = self._show_ref(morphs_dir, morphs_branch).split('\n')
refs = [x.split() for x in refs if 'origin' in x]
morphs_ref = refs[0][0]
gits_in_use_list = [quote_url(morphs_repo)]
for filename in self._ls_tree(morphs_dir, morphs_ref):
if not filename.endswith('.morph'):
continue
tree = json.loads(self._cat_file(morphs_dir, morphs_ref, filename))
if tree['kind'] != 'stratum' or 'chunks' not in tree:
continue
for chunk in tree['chunks']:
repo = chunk['repo']
directory = quote_url(self.resolver.pull_url(repo))
gits_in_use_list.append(directory)
unused_dir_list = []
submodule_dir_list = []
for git_dir in glob.glob(os.path.join(git_cache_dir, '*')):
git_dir_base = os.path.split(git_dir)[1]
if git_dir_base not in gits_in_use_list:
unused_dir_list.append(git_dir_base)
else:
submodules_file = os.path.join(git_dir, '.gitmodules')
if os.path.exists(submodules_file):
submodules = self._get_submodules(submodules_file)
submodule_dir_list.append(submodules)
result = []
for d in unused_dir_list:
if d not in submodule_dir_list:
result.append(d)
return result
def _get_submodules(self, gitmodules_file):
result = []
for line in open(gitmodules_file):
if line.strip().startswith('url'):
result.append(quote_url(line[line.find('=') + 1:].strip()))
return result
def _show_ref(self, cwd, ref):
return self.runcmd(['git', 'show-ref', ref], cwd = cwd)
def _ls_tree(self, cwd, ref):
result = self.runcmd(['git', 'ls-tree', '--name-only', ref], cwd = cwd)
return result.split('\n')
def _cat_file(self, cwd, ref, filename):
return self.runcmd(['git', 'cat-file', 'blob',
'%s:%s' % (ref, filename)],
cwd = cwd)
CleanGitCache().run()
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