source: trunk/packages/invirt-dev/invirtibuilder @ 3038

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1#!/usr/bin/python
2
3"""Process the Invirt build queue.
4
5The Invirtibuilder handles package builds and uploads. On demand, it
6attempts to build a particular package.
7
8If the build succeeds, the new version of the package is uploaded to
9the apt repository, tagged in its git repository, and the Invirt
10superproject is updated to point at the new version.
11
12If the build fails, the Invirtibuilder sends mail with the build log.
13
14The build queue is tracked via files in /var/lib/invirt-dev/queue. In
15order to maintain ordering, all filenames in that directory are the
16timestamp of their creation time.
17
18Each queue file contains a file of the form
19
20    pocket package hash principal
21
22where pocket is one of the pockets globally configured in
23build.pockets. For instance, the pockets in XVM are "prod" and "dev".
24
25principal is the Kerberos principal that requested the build.
26"""
27
28
29from __future__ import with_statement
30
31import contextlib
32import glob
33import os
34import re
35import shutil
36import subprocess
37import tempfile
38import traceback
39
40import pyinotify
41
42from debian_bundle import deb822
43
44import invirt.builder as b
45import invirt.common as c
46from invirt import database
47from invirt.config import structs as config
48
49
50DISTRIBUTION = 'hardy'
51
52
53def getControl(package, ref):
54    """Get the parsed debian/control file for a given package.
55
56    This returns a list of debian_bundle.deb822.Deb822 objects, one
57    for each section of the debian/control file. Each Deb822 object
58    acts roughly like a dict.
59    """
60    return deb822.Deb822.iter_paragraphs(
61        b.getGitFile(package, ref, 'debian/control').split('\n'))
62
63
64def getBinaries(package, ref):
65    """Get a list of binary packages in a package at a given ref."""
66    return [p['Package'] for p in getControl(package, ref)
67            if 'Package' in p]
68
69
70def getArches(package, ref):
71    """Get the set of all architectures in any binary package."""
72    arches = set()
73    for section in getControl(package, ref):
74        if 'Architecture' in section:
75            arches.update(section['Architecture'].split())
76    return arches
77
78
79def getDscName(package, ref):
80    """Return the .dsc file that will be generated for this package."""
81    v = b.getVersion(package, ref)
82    if v.debian_version:
83        v_str = '%s-%s' % (v.upstream_version,
84                           v.debian_version)
85    else:
86        v_str = v.upstream_version
87    return '%s_%s.dsc' % (
88        package,
89        v_str)
90
91
92def sanitizeVersion(version):
93    """Sanitize a Debian package version for use as a git tag.
94
95    This function strips the epoch from the version number and
96    replaces any tildes with periods."""
97    if v.debian_version:
98        v = '%s-%s' % (version.upstream_version,
99                       version.debian_version)
100    else:
101        v = version.upstream_version
102    return v.replace('~', '.')
103
104
105def aptCopy(package, commit, dst_pocket, src_pocket):
106    """Copy a package from one pocket to another."""
107    binaries = getBinaries(package, commit)
108    c.captureOutput(['reprepro-env', 'copy',
109                     b.pocketToApt(dst_pocket),
110                     b.pocketToApt(src_pocket),
111                     package] + binaries)
112
113
114def sbuild(package, ref, arch, workdir, arch_all=False):
115    """Build a package for a particular architecture."""
116    args = ['sbuild', '-v', '-d', DISTRIBUTION, '--arch', arch]
117    if arch_all:
118        args.append('-A')
119    args.append(getDscName(package, ref))
120    c.captureOutput(args, cwd=workdir)
121
122
123def sbuildAll(package, ref, workdir):
124    """Build a package for all architectures it supports."""
125    arches = getArches(package, ref)
126    if 'all' in arches or 'any' in arches or 'amd64' in arches:
127        sbuild(package, ref, 'amd64', workdir, arch_all=True)
128    if 'any' in arches or 'i386' in arches:
129        sbuild(package, ref, 'i386', workdir)
130
131
132def tagSubmodule(pocket, package, principal, version, env):
133    """Tag a new version of a submodule.
134
135    If this pocket does not allow_backtracking, then this will create
136    a new tag of the version at ref.
137
138    This function doesn't need to care about lock
139    contention. git-receive-pack updates one ref at a time, and only
140    takes out a lock for that ref after it's passed the update
141    hook. Because we reject pushes to tags in the update hook, no push
142    can ever take out a lock on any tags.
143
144    I'm sure that long description gives you great confidence in the
145    legitimacy of my reasoning.
146    """
147    if not config.build.pockets[pocket].get('allow_backtracking', False):
148        branch = b.pocketToGit(pocket)
149        tag_msg = ('Tag %s of %s\n\n'
150                   'Requested by %s' % (version.full_version,
151                                        package,
152                                        principal))
153
154        c.captureOutput(
155            ['git', 'tag', '-m', tag_msg, commit],
156            stdout=None,
157            env=env)
158
159
160def updateSubmoduleBranch(pocket, package, ref):
161    """Update the appropriately named branch in the submodule."""
162    branch = b.pocketToGit(pocket)
163    c.captureOutput(
164        ['git', 'update-ref', 'refs/heads/%s' % branch, ref], cwd=b.getRepo(package))
165
166
167def uploadBuild(pocket, workdir):
168    """Upload all build products in the work directory."""
169    apt = b.pocketToApt(pocket)
170    for changes in glob.glob(os.path.join(workdir, '*.changes')):
171        c.captureOutput(['reprepro-env',
172                       '--ignore=wrongdistribution',
173                       'include',
174                       apt,
175                       changes])
176
177
178def updateSuperproject(pocket, package, commit, principal, version, env):
179    """Update the superproject.
180
181    This will create a new commit on the branch for the given pocket
182    that sets the commit for the package submodule to commit.
183
184    Note that there's no locking issue here, because we disallow all
185    pushes to the superproject.
186    """
187    superproject = os.path.join(b._REPO_DIR, 'invirt/packages.git')
188    branch = b.pocketToGit(pocket)
189    tree = c.captureOutput(['git', 'ls-tree', branch],
190                           cwd=superproject).strip()
191
192    new_tree = re.compile(
193        r'^(160000 commit )[0-9a-f]*(\t%s)$' % package, re.M).sub(
194        r'\g<1>%s\g<2>' % commit,
195        tree)
196
197    new_tree_id = c.captureOutput(['git', 'mktree', '--missing'],
198                                  cwd=superproject,
199                                  stdin_str=new_tree).strip()
200
201    commit_msg = ('Update %s to version %s\n\n'
202                  'Requested by %s' % (package,
203                                       version.full_version,
204                                       principal))
205    new_commit = c.captureOutput(
206        ['git', 'commit-tree', new_tree_id, '-p', branch],
207        cwd=superproject,
208        env=env,
209        stdin_str=commit_msg).strip()
210
211    c.captureOutput(
212        ['git', 'update-ref', 'refs/heads/%s' % branch, new_commit],
213        cwd=superproject)
214
215
216def makeReadable(workdir):
217    os.chmod(workdir, 0755)
218
219@contextlib.contextmanager
220def packageWorkdir(package, commit):
221    """Checkout the package in a temporary working directory.
222
223    This context manager returns that working directory. The requested
224    package is checked out into a subdirectory of the working
225    directory with the same name as the package.
226
227    When the context wrapped with this context manager is exited, the
228    working directory is automatically deleted.
229    """
230    workdir = tempfile.mkdtemp()
231    try:
232        p_archive = subprocess.Popen(
233            ['git', 'archive',
234             '--remote=file://%s' % b.getRepo(package),
235             '--prefix=%s/' % package,
236             commit,
237             ],
238            stdout=subprocess.PIPE,
239            )
240        p_tar = subprocess.Popen(
241            ['tar', '-x'],
242            stdin=p_archive.stdout,
243            cwd=workdir,
244            )
245        p_archive.wait()
246        p_tar.wait()
247
248        yield workdir
249    finally:
250        shutil.rmtree(workdir)
251
252def build():
253    """Deal with items in the build queue.
254
255    When triggered, iterate over build queue items one at a time,
256    until there are no more pending build jobs.
257    """
258    while True:
259        stage = 'processing incoming job'
260        queue = os.listdir(b._QUEUE_DIR)
261        if not queue:
262            break
263
264        build = min(queue)
265        job = open(os.path.join(b._QUEUE_DIR, build)).read().strip()
266        pocket, package, commit, principal = job.split()
267
268        database.session.begin()
269        db = database.Build()
270        db.package = package
271        db.pocket = pocket
272        db.commit = commit
273        db.principal = principal
274        database.session.save_or_update(db)
275        database.session.commit()
276
277        database.session.begin()
278
279        try:
280            db.failed_stage = 'validating job'
281            # Don't expand the commit in the DB until we're sure the user
282            # isn't trying to be tricky.
283            b.ensureValidPackage(package)
284            db.commit = commit = b.canonicalize_commit(package, commit)
285            src = b.validateBuild(pocket, package, commit)
286
287            db.version = str(b.getVersion(package, commit))
288            b.runHook('pre-build', [str(db.build_id), db.pocket, db.package,
289                                    db.commit, db.principal, db.version, str(db.inserted_at)])
290
291            # If validateBuild returns something other than True, then
292            # it means we should copy from that pocket to our pocket.
293            #
294            # (If the validation failed, validateBuild would have
295            # raised an exception)
296            if src != True:
297                db.failed_stage = 'copying package from another pocket'
298                aptCopy(package, commit, pocket, src)
299            # If we can't copy the package from somewhere, but
300            # validateBuild didn't raise an exception, then we need to
301            # do the build ourselves
302            else:
303                db.failed_stage = 'checking out package source'
304                with packageWorkdir(package, commit) as workdir:
305                    db.failed_stage = 'preparing source package'
306                    packagedir = os.path.join(workdir, package)
307
308                    # We should be more clever about dealing with
309                    # things like non-Debian-native packages than we
310                    # are.
311                    #
312                    # If we were, we could use debuild and get nice
313                    # environment scrubbing. Since we're not, debuild
314                    # complains about not having an orig.tar.gz
315                    c.captureOutput(['dpkg-buildpackage', '-us', '-uc', '-S'],
316                                  cwd=packagedir,
317                                  stdout=None)
318
319                    try:
320                        db.failed_stage = 'building binary packages'
321                        sbuildAll(package, commit, workdir)
322                    finally:
323                        logdir = os.path.join(b._LOG_DIR, str(db.build_id))
324                        if not os.path.exists(logdir):
325                            os.makedirs(logdir)
326
327                        for log in glob.glob(os.path.join(workdir, 'build-*.log')):
328                            os.copy(log, logdir)
329
330                    db.failed_stage = 'processing metadata'
331                    env = dict(os.environ)
332                    env['GIT_COMMITTER_NAME'] = config.build.tagger.name
333                    env['GIT_COMMITTER_EMAIL'] = config.build.tagger.email
334                    version = b.getVersion(package, commit)
335
336                    db.failed_stage = 'tagging submodule'
337                    tagSubmodule(pocket, package, principal, version, env)
338                    db.failed_stage = 'updating submodule branches'
339                    updateSubmoduleBranch(pocket, package, commit)
340                    db.failed_stage = 'updating superproject'
341                    updateSuperproject(pocket, package, commit, principal, version, env)
342                    db.failed_stage = 'relaxing permissions on workdir'
343                    makeReadable(workdir)
344                    db.failed_stage = 'uploading packages to apt repo'
345                    uploadBuild(pocket, workdir)
346
347                    db.failed_stage = 'cleaning up'
348        except:
349            db.traceback = traceback.format_exc()
350        else:
351            db.succeeded = True
352            db.failed_stage = None
353        finally:
354            database.session.save_or_update(db)
355            database.session.commit()
356
357            # Finally, now that everything is done, remove the
358            # build queue item
359            os.unlink(os.path.join(b._QUEUE_DIR, build))
360
361            if db.succeeded:
362                b.runHook('post-build', [str(db.build_id)])
363            else:
364                b.runHook('failed-build', [str(db.build_id)])
365
366class Invirtibuilder(pyinotify.ProcessEvent):
367    """Process inotify triggers to build new packages."""
368    def process_default(self, event):
369        """Handle an inotify event.
370
371        When an inotify event comes in, trigger the builder.
372        """
373        build()
374
375
376def main():
377    """Initialize the inotifications and start the main loop."""
378    database.connect()
379
380    watch_manager = pyinotify.WatchManager()
381    invirtibuilder = Invirtibuilder()
382    notifier = pyinotify.Notifier(watch_manager, invirtibuilder)
383    watch_manager.add_watch(b._QUEUE_DIR,
384                            pyinotify.EventsCodes.ALL_FLAGS['IN_CREATE'] |
385                            pyinotify.EventsCodes.ALL_FLAGS['IN_MOVED_TO'])
386
387    # Before inotifying, run any pending builds; otherwise we won't
388    # get notified for them.
389    build()
390
391    while True:
392        notifier.process_events()
393        if notifier.check_events():
394            notifier.read_events()
395
396
397if __name__ == '__main__':
398    main()
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