1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
# Copyright (C) 2014 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.
import cliapp
import collections
import logging
import morphlib
class SourceResolver(object):
'''Provides a way of resolving the set of sources for a given system.
There are two levels of caching involved in resolving the sources to build.
The canonical source for each source is specified in the build-command
(for strata and systems) or in the stratum morphology (for chunks). It will
be either a normal URL, or a keyed URL using a repo-alias like
'baserock:baserock/definitions'.
The 'remote repo cache' is a Baserock Trove system. It functions as a
normal Git server, but in addition it runs a service on port 8080 called
'morph-cache-server' which can resolve refs, list their contents and read
specific files from the repos it holds. This allows the SourceResolver to
work out how to build something without cloning the whole repo. (If a local
build of that source ends up being necessary then it will get cloned into
the local cache later on).
The second layer of caching is the local repository cache, which mirrors
entire repositories in $cachedir/gits. If a repo is not in the remote repo
cache then it must be present in the local repo cache.
'''
def __init__(self, local_repo_cache, remote_repo_cache, update_repos,
status_cb=None):
self.lrc = local_repo_cache
self.rrc = remote_repo_cache
self.update = update_repos
self.status = status_cb
def resolve_ref(self, reponame, ref):
'''Resolves commit and tree sha1s of the ref in a repo and returns it.
If update is True then this has the side-effect of updating
or cloning the repository into the local repo cache.
'''
absref = None
if self.lrc.has_repo(reponame):
repo = self.lrc.get_repo(reponame)
if self.update and repo.requires_update_for_ref(ref):
self.status(msg='Updating cached git repository %(reponame)s '
'for ref %(ref)s', reponame=reponame, ref=ref)
repo.update()
# If the user passed --no-git-update, and the ref is a SHA1 not
# available locally, this call will raise an exception.
absref, tree = repo.resolve_ref(ref)
elif self.rrc is not None:
try:
absref, tree = self.rrc.resolve_ref(reponame, ref)
if absref is not None:
self.status(msg='Resolved %(reponame)s %(ref)s via remote '
'repo cache',
reponame=reponame,
ref=ref,
chatty=True)
except BaseException, e:
logging.warning('Caught (and ignored) exception: %s' % str(e))
if absref is None:
if self.update:
self.status(msg='Caching git repository %(reponame)s',
reponame=reponame)
repo = self.lrc.cache_repo(reponame)
repo.update()
else:
repo = self.lrc.get_repo(reponame)
absref, tree = repo.resolve_ref(ref)
return absref, tree
def traverse_morphs(self, definitions_repo, definitions_ref,
system_filenames,
visit=lambda rn, rf, fn, arf, m: None,
definitions_original_ref=None):
morph_factory = morphlib.morphologyfactory.MorphologyFactory(
self.lrc, self.rrc, self.status)
definitions_queue = collections.deque(system_filenames)
chunk_in_definitions_repo_queue = []
chunk_in_source_repo_queue = []
resolved_refs = {}
resolved_morphologies = {}
# Resolve the (repo, ref) pair for the definitions repo, cache result.
definitions_absref, definitions_tree = self.resolve_ref(
definitions_repo, definitions_ref)
if definitions_original_ref:
definitions_ref = definitions_original_ref
while definitions_queue:
filename = definitions_queue.popleft()
key = (definitions_repo, definitions_absref, filename)
if not key in resolved_morphologies:
resolved_morphologies[key] = morph_factory.get_morphology(*key)
morphology = resolved_morphologies[key]
visit(definitions_repo, definitions_ref, filename,
definitions_absref, definitions_tree, morphology)
if morphology['kind'] == 'cluster':
raise cliapp.AppException(
"Cannot build a morphology of type 'cluster'.")
elif morphology['kind'] == 'system':
definitions_queue.extend(
morphlib.util.sanitise_morphology_path(s['morph'])
for s in morphology['strata'])
elif morphology['kind'] == 'stratum':
if morphology['build-depends']:
definitions_queue.extend(
morphlib.util.sanitise_morphology_path(s['morph'])
for s in morphology['build-depends'])
for c in morphology['chunks']:
if 'morph' not in c:
path = morphlib.util.sanitise_morphology_path(
c.get('morph', c['name']))
chunk_in_source_repo_queue.append(
(c['repo'], c['ref'], path))
continue
chunk_in_definitions_repo_queue.append(
(c['repo'], c['ref'], c['morph']))
for repo, ref, filename in chunk_in_definitions_repo_queue:
if (repo, ref) not in resolved_refs:
resolved_refs[repo, ref] = self.resolve_ref(repo, ref)
absref, tree = resolved_refs[repo, ref]
key = (definitions_repo, definitions_absref, filename)
if not key in resolved_morphologies:
resolved_morphologies[key] = morph_factory.get_morphology(*key)
morphology = resolved_morphologies[key]
visit(repo, ref, filename, absref, tree, morphology)
for repo, ref, filename in chunk_in_source_repo_queue:
if (repo, ref) not in resolved_refs:
resolved_refs[repo, ref] = self.resolve_ref(repo, ref)
absref, tree = resolved_refs[repo, ref]
key = (repo, absref, filename)
if key not in resolved_morphologies:
resolved_morphologies[key] = morph_factory.get_morphology(*key)
morphology = resolved_morphologies[key]
visit(repo, ref, filename, absref, tree, morphology)
def create_source_pool(lrc, rrc, repo, ref, filename,
original_ref=None, update_repos=True,
status_cb=None):
'''Find all the sources involved in building a given system.
Given a system morphology, this function will traverse the tree of stratum
and chunk morphologies that the system points to and create appropriate
Source objects. These are added to a new SourcePool object, which is
returned.
Note that Git submodules are not considered 'sources' in the current
implementation, and so they must be handled separately.
The 'lrc' and 'rrc' parameters specify the local and remote Git repository
caches used for resolving the sources.
'''
pool = morphlib.sourcepool.SourcePool()
def add_to_pool(reponame, ref, filename, absref, tree, morphology):
sources = morphlib.source.make_sources(reponame, ref,
filename, absref,
tree, morphology)
for source in sources:
pool.add(source)
resolver = SourceResolver(lrc, rrc, update_repos, status_cb)
resolver.traverse_morphs(repo, ref, [filename],
visit=add_to_pool,
definitions_original_ref=original_ref)
return pool
|
