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# 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.
import cliapp
import os
import tempfile
import gzip
import morphlib
class MountableImage(object):
'''Mountable image (deals with decompression).
Note, this is a read-only mount in the sense that the decompressed
image is not then recompressed after, instead any changes are discarded.
'''
def __init__(self, app, artifact_path):
self.app = app
self.artifact_path = artifact_path
def setup(self, path):
self.app.status(msg='Preparing image %(path)s', path=path)
self.app.status(msg=' Decompressing...', chatty=True)
(tempfd, self.temp_path) = \
tempfile.mkstemp(dir=self.app.settings['tempdir'])
try:
with os.fdopen(tempfd, "wb") as outfh:
infh = gzip.open(path, "rb")
morphlib.util.copyfileobj(infh, outfh)
infh.close()
except:
os.unlink(self.temp_path)
raise
self.app.status(msg=' Mounting image at %(path)s',
path=self.temp_path, chatty=True)
part = morphlib.fsutils.setup_device_mapping(self.app.runcmd,
self.temp_path)
mount_point = tempfile.mkdtemp(dir=self.app.settings['tempdir'])
morphlib.fsutils.mount(self.app.runcmd, part, mount_point)
self.mount_point = mount_point
return mount_point
def cleanup(self, path, mount_point):
self.app.status(msg='Clearing down image at %(path)s', path=path,
chatty=True)
try:
morphlib.fsutils.unmount(self.app.runcmd, mount_point)
except:
pass
try:
morphlib.fsutils.undo_device_mapping(self.app.runcmd, path)
except:
pass
try:
os.rmdir(mount_point)
os.unlink(path)
except:
pass
def __enter__(self):
return self.setup(self.artifact_path)
def __exit__(self, exctype, excvalue, exctraceback):
self.cleanup(self.temp_path, self.mount_point)
class TrebuchetPlugin(cliapp.Plugin):
def enable(self):
self.app.add_subcommand('make-patch',
self.make_patch,
arg_synopsis='PATH SRC_TRIPLE TGT_TRIPLE')
def disable(self):
pass
def make_patch(self, args):
'''Create a Trebuchet patch between two system images.'''
if len(args) != 7:
raise cliapp.AppException('make-patch requires arguments: '
'name of output file plus two triplets')
output = args[0]
repo_name1, ref1, filename1 = args[1:4]
repo_name2, ref2, filename2 = args[4:7]
app = self.app
build_env = morphlib.buildenvironment.BuildEnvironment(app.settings)
ckc = morphlib.cachekeycomputer.CacheKeyComputer(build_env)
lac, rac = morphlib.util.new_artifact_caches(app.settings)
lrc, rrc = morphlib.util.new_repo_caches(app)
def the_one(source, repo_name, ref, filename):
return (source.repo_name == repo_name and
source.original_ref == ref and
source.filename == filename)
def get_artifact(repo_name, ref, filename):
srcpool = app.create_source_pool(
lrc, rrc, (repo_name, ref, filename))
ar = morphlib.artifactresolver.ArtifactResolver()
artifacts = ar.resolve_artifacts(srcpool)
for artifact in artifacts:
artifact.cache_key = ckc.compute_key(artifact)
if the_one(artifact.source, repo_name, ref, filename):
a = morphlib.artifact.Artifact(
artifact.source,
artifact.source.morphology['name'] + '-rootfs')
a.cache_key = artifact.cache_key
return a
artifact1 = get_artifact(repo_name1, ref1, filename1)
artifact2 = get_artifact(repo_name2, ref2, filename2)
image_path_1 = lac.get(artifact1).name
image_path_2 = lac.get(artifact2).name
mount_point_1 = None
mount_point_2 = None
with MountableImage(app, image_path_1) as mount_point_1:
with MountableImage(app, image_path_2) as mount_point_2:
app.runcmd(['tbdiff-create', output,
os.path.join(mount_point_1, 'factory'),
os.path.join(mount_point_2, 'factory')])
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