| # Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """This script fetches and prepares an SDK chroot.""" |
| |
| from __future__ import print_function |
| |
| import glob |
| import logging |
| import os |
| import pwd |
| import re |
| import sys |
| import urlparse |
| |
| from chromite.cbuildbot import constants |
| from chromite.lib import cgroups |
| from chromite.lib import commandline |
| from chromite.lib import cros_build_lib |
| from chromite.lib import locking |
| from chromite.lib import namespaces |
| from chromite.lib import osutils |
| from chromite.lib import process_util |
| from chromite.lib import retry_util |
| from chromite.lib import toolchain |
| |
| cros_build_lib.STRICT_SUDO = True |
| |
| |
| COMPRESSION_PREFERENCE = ('xz', 'bz2') |
| |
| # TODO(zbehan): Remove the dependency on these, reimplement them in python |
| MAKE_CHROOT = [os.path.join(constants.SOURCE_ROOT, |
| 'src/scripts/sdk_lib/make_chroot.sh')] |
| ENTER_CHROOT = [os.path.join(constants.SOURCE_ROOT, |
| 'src/scripts/sdk_lib/enter_chroot.sh')] |
| |
| # Proxy simulator configuration. |
| PROXY_HOST_IP = '192.168.240.1' |
| PROXY_PORT = 8080 |
| PROXY_GUEST_IP = '192.168.240.2' |
| PROXY_NETMASK = 30 |
| PROXY_VETH_PREFIX = 'veth' |
| PROXY_CONNECT_PORTS = (80, 443, 9418) |
| PROXY_APACHE_FALLBACK_USERS = ('www-data', 'apache', 'nobody') |
| PROXY_APACHE_MPMS = ('event', 'worker', 'prefork') |
| PROXY_APACHE_FALLBACK_PATH = ':'.join( |
| '/usr/lib/apache2/mpm-%s' % mpm for mpm in PROXY_APACHE_MPMS |
| ) |
| PROXY_APACHE_MODULE_GLOBS = ('/usr/lib*/apache2/modules', '/usr/lib*/apache2') |
| |
| # We need these tools to run. Very common tools (tar,..) are omitted. |
| NEEDED_TOOLS = ('curl', 'xz') |
| |
| # Tools needed for --proxy-sim only. |
| PROXY_NEEDED_TOOLS = ('ip',) |
| |
| |
| def GetArchStageTarballs(version): |
| """Returns the URL for a given arch/version""" |
| extension = {'bz2':'tbz2', 'xz':'tar.xz'} |
| return [toolchain.GetSdkURL(suburl='cros-sdk-%s.%s' |
| % (version, extension[compressor])) |
| for compressor in COMPRESSION_PREFERENCE] |
| |
| |
| def GetStage3Urls(version): |
| return [toolchain.GetSdkURL(suburl='stage3-amd64-%s.tar.%s' % (version, ext)) |
| for ext in COMPRESSION_PREFERENCE] |
| |
| |
| def FetchRemoteTarballs(storage_dir, urls): |
| """Fetches a tarball given by url, and place it in |storage_dir|. |
| |
| Args: |
| storage_dir: Path where to save the tarball. |
| urls: List of URLs to try to download. Download will stop on first success. |
| |
| Returns: |
| Full path to the downloaded file |
| """ |
| |
| # Note we track content length ourselves since certain versions of curl |
| # fail if asked to resume a complete file. |
| # pylint: disable=C0301,W0631 |
| # https://sourceforge.net/tracker/?func=detail&atid=100976&aid=3482927&group_id=976 |
| status_re = re.compile(r'^HTTP/[0-9]+(\.[0-9]+)? 200') |
| for url in urls: |
| # http://www.logilab.org/ticket/8766 |
| # pylint: disable=E1101 |
| parsed = urlparse.urlparse(url) |
| tarball_name = os.path.basename(parsed.path) |
| if parsed.scheme in ('', 'file'): |
| if os.path.exists(parsed.path): |
| return parsed.path |
| continue |
| content_length = 0 |
| print('Attempting download: %s' % url) |
| result = retry_util.RunCurl( |
| ['-I', url], fail=False, capture_output=False, redirect_stdout=True, |
| redirect_stderr=True, print_cmd=False, debug_level=logging.INFO) |
| successful = False |
| for header in result.output.splitlines(): |
| # We must walk the output to find the 200 code for use cases where |
| # a proxy is involved and may have pushed down the actual header. |
| if status_re.match(header): |
| successful = True |
| elif header.lower().startswith('content-length:'): |
| content_length = int(header.split(':', 1)[-1].strip()) |
| if successful: |
| break |
| if successful: |
| break |
| else: |
| raise Exception('No valid URLs found!') |
| |
| tarball_dest = os.path.join(storage_dir, tarball_name) |
| current_size = 0 |
| if os.path.exists(tarball_dest): |
| current_size = os.path.getsize(tarball_dest) |
| if current_size > content_length: |
| osutils.SafeUnlink(tarball_dest) |
| current_size = 0 |
| |
| if current_size < content_length: |
| retry_util.RunCurl( |
| ['-L', '-y', '30', '-C', '-', '--output', tarball_dest, url], |
| print_cmd=False, capture_output=False, debug_level=logging.INFO) |
| |
| # Cleanup old tarballs now since we've successfull fetched; only cleanup |
| # the tarballs for our prefix, or unknown ones. |
| ignored_prefix = ('stage3-' if tarball_name.startswith('cros-sdk-') |
| else 'cros-sdk-') |
| for filename in os.listdir(storage_dir): |
| if filename == tarball_name or filename.startswith(ignored_prefix): |
| continue |
| |
| print('Cleaning up old tarball: %s' % (filename,)) |
| osutils.SafeUnlink(os.path.join(storage_dir, filename)) |
| |
| return tarball_dest |
| |
| |
| def CreateChroot(chroot_path, sdk_tarball, cache_dir, nousepkg=False): |
| """Creates a new chroot from a given SDK""" |
| |
| cmd = MAKE_CHROOT + ['--stage3_path', sdk_tarball, |
| '--chroot', chroot_path, |
| '--cache_dir', cache_dir] |
| if nousepkg: |
| cmd.append('--nousepkg') |
| |
| try: |
| cros_build_lib.RunCommand(cmd, print_cmd=False) |
| except cros_build_lib.RunCommandError: |
| raise SystemExit('Running %r failed!' % cmd) |
| |
| |
| def DeleteChroot(chroot_path): |
| """Deletes an existing chroot""" |
| cmd = MAKE_CHROOT + ['--chroot', chroot_path, |
| '--delete'] |
| try: |
| cros_build_lib.RunCommand(cmd, print_cmd=False) |
| except cros_build_lib.RunCommandError: |
| raise SystemExit('Running %r failed!' % cmd) |
| |
| |
| def EnterChroot(chroot_path, cache_dir, chrome_root, chrome_root_mount, |
| additional_args): |
| """Enters an existing SDK chroot""" |
| st = os.statvfs(os.path.join(chroot_path, 'usr', 'bin', 'sudo')) |
| # The os.ST_NOSUID constant wasn't added until python-3.2. |
| if st.f_flag & 0x2: |
| cros_build_lib.Die('chroot cannot be in a nosuid mount') |
| |
| cmd = ENTER_CHROOT + ['--chroot', chroot_path, '--cache_dir', cache_dir] |
| if chrome_root: |
| cmd.extend(['--chrome_root', chrome_root]) |
| if chrome_root_mount: |
| cmd.extend(['--chrome_root_mount', chrome_root_mount]) |
| if len(additional_args) > 0: |
| cmd.append('--') |
| cmd.extend(additional_args) |
| |
| ret = cros_build_lib.RunCommand(cmd, print_cmd=False, error_code_ok=True) |
| # If we were in interactive mode, ignore the exit code; it'll be whatever |
| # they last ran w/in the chroot and won't matter to us one way or another. |
| # Note this does allow chroot entrance to fail and be ignored during |
| # interactive; this is however a rare case and the user will immediately |
| # see it (nor will they be checking the exit code manually). |
| if ret.returncode != 0 and additional_args: |
| raise SystemExit('Running {%s} failed with exit code %i' |
| % (ret.cmdstr, ret.returncode)) |
| |
| |
| def _SudoCommand(): |
| """Get the 'sudo' command, along with all needed environment variables.""" |
| |
| # Pass in the ENVIRONMENT_WHITELIST and ENV_PASSTHRU variables so that |
| # scripts in the chroot know what variables to pass through. |
| cmd = ['sudo'] |
| for key in constants.CHROOT_ENVIRONMENT_WHITELIST + constants.ENV_PASSTHRU: |
| value = os.environ.get(key) |
| if value is not None: |
| cmd += ['%s=%s' % (key, value)] |
| |
| # Pass in the path to the depot_tools so that users can access them from |
| # within the chroot. |
| cmd += ['DEPOT_TOOLS=%s' % constants.DEPOT_TOOLS_DIR] |
| |
| return cmd |
| |
| |
| def _ReportMissing(missing): |
| """Report missing utilities, then exit. |
| |
| Args: |
| missing: List of missing utilities, as returned by |
| osutils.FindMissingBinaries. If non-empty, will not return. |
| """ |
| |
| if missing: |
| raise SystemExit( |
| 'The tool(s) %s were not found.\n' |
| 'Please install the appropriate package in your host.\n' |
| 'Example(ubuntu):\n' |
| ' sudo apt-get install <packagename>' |
| % ', '.join(missing)) |
| |
| |
| def _ProxySimSetup(options): |
| """Set up proxy simulator, and return only in the child environment. |
| |
| TODO: Ideally, this should support multiple concurrent invocations of |
| cros_sdk --proxy-sim; currently, such invocations will conflict with each |
| other due to the veth device names and IP addresses. Either this code would |
| need to generate fresh, unused names for all of these before forking, or it |
| would need to support multiple concurrent cros_sdk invocations sharing one |
| proxy and allowing it to exit when unused (without counting on any local |
| service-management infrastructure on the host). |
| """ |
| |
| may_need_mpm = False |
| apache_bin = osutils.Which('apache2') |
| if apache_bin is None: |
| apache_bin = osutils.Which('apache2', PROXY_APACHE_FALLBACK_PATH) |
| if apache_bin is None: |
| _ReportMissing(('apache2',)) |
| else: |
| may_need_mpm = True |
| |
| # Module names and .so names included for ease of grepping. |
| apache_modules = [('proxy_module', 'mod_proxy.so'), |
| ('proxy_connect_module', 'mod_proxy_connect.so'), |
| ('proxy_http_module', 'mod_proxy_http.so'), |
| ('proxy_ftp_module', 'mod_proxy_ftp.so')] |
| |
| # Find the apache module directory, and make sure it has the modules we need. |
| module_dirs = {} |
| for g in PROXY_APACHE_MODULE_GLOBS: |
| for mod, so in apache_modules: |
| for f in glob.glob(os.path.join(g, so)): |
| module_dirs.setdefault(os.path.dirname(f), []).append(so) |
| for apache_module_path, modules_found in module_dirs.iteritems(): |
| if len(modules_found) == len(apache_modules): |
| break |
| else: |
| # Appease cros lint, which doesn't understand that this else block will not |
| # fall through to the subsequent code which relies on apache_module_path. |
| apache_module_path = None |
| raise SystemExit( |
| 'Could not find apache module path containing all required modules: %s' |
| % ', '.join(so for mod, so in apache_modules)) |
| |
| def check_add_module(name): |
| so = 'mod_%s.so' % name |
| if os.access(os.path.join(apache_module_path, so), os.F_OK): |
| mod = '%s_module' % name |
| apache_modules.append((mod, so)) |
| return True |
| return False |
| |
| check_add_module('authz_core') |
| if may_need_mpm: |
| for mpm in PROXY_APACHE_MPMS: |
| if check_add_module('mpm_%s' % mpm): |
| break |
| |
| veth_host = '%s-host' % PROXY_VETH_PREFIX |
| veth_guest = '%s-guest' % PROXY_VETH_PREFIX |
| |
| # Set up pipes from parent to child and vice versa. |
| # The child writes a byte to the parent after calling unshare, so that the |
| # parent can then assign the guest end of the veth interface to the child's |
| # new network namespace. The parent then writes a byte to the child after |
| # assigning the guest interface, so that the child can then configure that |
| # interface. In both cases, if we get back an EOF when reading from the |
| # pipe, we assume the other end exited with an error message, so just exit. |
| parent_readfd, child_writefd = os.pipe() |
| child_readfd, parent_writefd = os.pipe() |
| SUCCESS_FLAG = '+' |
| |
| pid = os.fork() |
| if not pid: |
| os.close(parent_readfd) |
| os.close(parent_writefd) |
| |
| namespaces.Unshare(namespaces.CLONE_NEWNET) |
| os.write(child_writefd, SUCCESS_FLAG) |
| os.close(child_writefd) |
| if os.read(child_readfd, 1) != SUCCESS_FLAG: |
| # Parent failed; it will have already have outputted an error message. |
| sys.exit(1) |
| os.close(child_readfd) |
| |
| # Set up child side of the network. |
| commands = ( |
| ('ip', 'link', 'set', 'up', 'lo'), |
| ('ip', 'address', 'add', |
| '%s/%u' % (PROXY_GUEST_IP, PROXY_NETMASK), |
| 'dev', veth_guest), |
| ('ip', 'link', 'set', veth_guest, 'up'), |
| ) |
| try: |
| for cmd in commands: |
| cros_build_lib.RunCommand(cmd, print_cmd=False) |
| except cros_build_lib.RunCommandError: |
| raise SystemExit('Running %r failed!' % (cmd,)) |
| |
| proxy_url = 'http://%s:%u' % (PROXY_HOST_IP, PROXY_PORT) |
| for proto in ('http', 'https', 'ftp'): |
| os.environ[proto + '_proxy'] = proxy_url |
| for v in ('all_proxy', 'RSYNC_PROXY', 'no_proxy'): |
| os.environ.pop(v, None) |
| return |
| |
| os.close(child_readfd) |
| os.close(child_writefd) |
| |
| if os.read(parent_readfd, 1) != SUCCESS_FLAG: |
| # Child failed; it will have already have outputted an error message. |
| sys.exit(1) |
| os.close(parent_readfd) |
| |
| # Set up parent side of the network. |
| uid = int(os.environ.get('SUDO_UID', '0')) |
| gid = int(os.environ.get('SUDO_GID', '0')) |
| if uid == 0 or gid == 0: |
| for username in PROXY_APACHE_FALLBACK_USERS: |
| try: |
| pwnam = pwd.getpwnam(username) |
| uid, gid = pwnam.pw_uid, pwnam.pw_gid |
| break |
| except KeyError: |
| continue |
| if uid == 0 or gid == 0: |
| raise SystemExit('Could not find a non-root user to run Apache as') |
| |
| chroot_parent, chroot_base = os.path.split(options.chroot) |
| pid_file = os.path.join(chroot_parent, '.%s-apache-proxy.pid' % chroot_base) |
| log_file = os.path.join(chroot_parent, '.%s-apache-proxy.log' % chroot_base) |
| |
| apache_directives = [ |
| 'User #%u' % uid, |
| 'Group #%u' % gid, |
| 'PidFile %s' % pid_file, |
| 'ErrorLog %s' % log_file, |
| 'Listen %s:%u' % (PROXY_HOST_IP, PROXY_PORT), |
| 'ServerName %s' % PROXY_HOST_IP, |
| 'ProxyRequests On', |
| 'AllowCONNECT %s' % ' '.join(map(str, PROXY_CONNECT_PORTS)), |
| ] + [ |
| 'LoadModule %s %s' % (mod, os.path.join(apache_module_path, so)) |
| for (mod, so) in apache_modules |
| ] |
| commands = ( |
| ('ip', 'link', 'add', 'name', veth_host, |
| 'type', 'veth', 'peer', 'name', veth_guest), |
| ('ip', 'address', 'add', |
| '%s/%u' % (PROXY_HOST_IP, PROXY_NETMASK), |
| 'dev', veth_host), |
| ('ip', 'link', 'set', veth_host, 'up'), |
| ([apache_bin, '-f', '/dev/null'] + |
| [arg for d in apache_directives for arg in ('-C', d)]), |
| ('ip', 'link', 'set', veth_guest, 'netns', str(pid)), |
| ) |
| cmd = None # Make cros lint happy. |
| try: |
| for cmd in commands: |
| cros_build_lib.RunCommand(cmd, print_cmd=False) |
| except cros_build_lib.RunCommandError: |
| # Clean up existing interfaces, if any. |
| cmd_cleanup = ('ip', 'link', 'del', veth_host) |
| try: |
| cros_build_lib.RunCommand(cmd_cleanup, print_cmd=False) |
| except cros_build_lib.RunCommandError: |
| cros_build_lib.Error('running %r failed', cmd_cleanup) |
| raise SystemExit('Running %r failed!' % (cmd,)) |
| os.write(parent_writefd, SUCCESS_FLAG) |
| os.close(parent_writefd) |
| |
| process_util.ExitAsStatus(os.waitpid(pid, 0)[1]) |
| |
| |
| def _ReExecuteIfNeeded(argv): |
| """Re-execute cros_sdk as root. |
| |
| Also unshare the mount namespace so as to ensure that processes outside |
| the chroot can't mess with our mounts. |
| """ |
| if os.geteuid() != 0: |
| cmd = _SudoCommand() + ['--'] + argv |
| os.execvp(cmd[0], cmd) |
| else: |
| # We must set up the cgroups mounts before we enter our own namespace. |
| # This way it is a shared resource in the root mount namespace. |
| cgroups.Cgroup.InitSystem() |
| namespaces.SimpleUnshare() |
| |
| |
| def _CreateParser(sdk_latest_version, bootstrap_latest_version): |
| """Generate and return the parser with all the options.""" |
| usage = """usage: %prog [options] [VAR1=val1 .. VARn=valn -- args] |
| |
| This script is used for manipulating local chroot environments; creating, |
| deleting, downloading, etc. If given --enter (or no args), it defaults |
| to an interactive bash shell within the chroot. |
| |
| If given args those are passed to the chroot environment, and executed.""" |
| |
| parser = commandline.OptionParser(usage=usage, caching=True) |
| |
| # Global options. |
| default_chroot = os.path.join(constants.SOURCE_ROOT, |
| constants.DEFAULT_CHROOT_DIR) |
| parser.add_option( |
| '--chroot', dest='chroot', default=default_chroot, type='path', |
| help=('SDK chroot dir name [%s]' % constants.DEFAULT_CHROOT_DIR)) |
| |
| parser.add_option('--chrome_root', default=None, type='path', |
| help='Mount this chrome root into the SDK chroot') |
| parser.add_option('--chrome_root_mount', default=None, type='path', |
| help='Mount chrome into this path inside SDK chroot') |
| parser.add_option('--nousepkg', action='store_true', default=False, |
| help='Do not use binary packages when creating a chroot.') |
| parser.add_option('-u', '--url', |
| dest='sdk_url', default=None, |
| help=('''Use sdk tarball located at this url. |
| Use file:// for local files.''')) |
| parser.add_option('--sdk-version', default=None, |
| help=('Use this sdk version. For prebuilt, current is %r' |
| ', for bootstrapping it is %r.' |
| % (sdk_latest_version, bootstrap_latest_version))) |
| |
| # Commands. |
| group = parser.add_option_group('Commands') |
| group.add_option( |
| '--enter', action='store_true', default=False, |
| help='Enter the SDK chroot. Implies --create.') |
| group.add_option( |
| '--create', action='store_true', default=False, |
| help='Create the chroot only if it does not already exist. ' |
| 'Implies --download.') |
| group.add_option( |
| '--bootstrap', action='store_true', default=False, |
| help='Build everything from scratch, including the sdk. ' |
| 'Use this only if you need to validate a change ' |
| 'that affects SDK creation itself (toolchain and ' |
| 'build are typically the only folk who need this). ' |
| 'Note this will quite heavily slow down the build. ' |
| 'This option implies --create --nousepkg.') |
| group.add_option( |
| '-r', '--replace', action='store_true', default=False, |
| help='Replace an existing SDK chroot. Basically an alias ' |
| 'for --delete --create.') |
| group.add_option( |
| '--delete', action='store_true', default=False, |
| help='Delete the current SDK chroot if it exists.') |
| group.add_option( |
| '--download', action='store_true', default=False, |
| help='Download the sdk.') |
| commands = group |
| |
| # Namespace options. |
| group = parser.add_option_group('Namespaces') |
| group.add_option('--proxy-sim', action='store_true', default=False, |
| help='Simulate a restrictive network requiring an outbound' |
| ' proxy.') |
| group.add_option('--no-ns-pid', dest='ns_pid', |
| default=True, action='store_false', |
| help='Do not create a new PID namespace.') |
| |
| # Internal options. |
| group = parser.add_option_group( |
| 'Internal Chromium OS Build Team Options', |
| 'Caution: these are for meant for the Chromium OS build team only') |
| group.add_option('--buildbot-log-version', default=False, action='store_true', |
| help='Log SDK version for buildbot consumption') |
| |
| return (parser, commands) |
| |
| |
| def main(argv): |
| conf = cros_build_lib.LoadKeyValueFile( |
| os.path.join(constants.SOURCE_ROOT, constants.SDK_VERSION_FILE), |
| ignore_missing=True) |
| sdk_latest_version = conf.get('SDK_LATEST_VERSION', '<unknown>') |
| bootstrap_latest_version = conf.get('BOOTSTRAP_LATEST_VERSION', '<unknown>') |
| parser, commands = _CreateParser(sdk_latest_version, bootstrap_latest_version) |
| options, chroot_command = parser.parse_args(argv) |
| |
| # Some sanity checks first, before we ask for sudo credentials. |
| cros_build_lib.AssertOutsideChroot() |
| |
| host = os.uname()[4] |
| if host != 'x86_64': |
| parser.error( |
| "cros_sdk is currently only supported on x86_64; you're running" |
| " %s. Please find a x86_64 machine." % (host,)) |
| |
| _ReportMissing(osutils.FindMissingBinaries(NEEDED_TOOLS)) |
| if options.proxy_sim: |
| _ReportMissing(osutils.FindMissingBinaries(PROXY_NEEDED_TOOLS)) |
| |
| _ReExecuteIfNeeded([sys.argv[0]] + argv) |
| if options.ns_pid: |
| first_pid = namespaces.CreatePidNs() |
| else: |
| first_pid = None |
| |
| # Expand out the aliases... |
| if options.replace: |
| options.delete = options.create = True |
| |
| if options.bootstrap: |
| options.create = True |
| |
| # If a command is not given, default to enter. |
| options.enter |= not any(getattr(options, x.dest) |
| for x in commands.option_list) |
| options.enter |= bool(chroot_command) |
| |
| if options.enter and options.delete and not options.create: |
| parser.error("Trying to enter the chroot when --delete " |
| "was specified makes no sense.") |
| |
| # Finally, discern if we need to create the chroot. |
| chroot_exists = os.path.exists(options.chroot) |
| if options.create or options.enter: |
| # Only create if it's being wiped, or if it doesn't exist. |
| if not options.delete and chroot_exists: |
| options.create = False |
| else: |
| options.download = True |
| |
| # Finally, flip create if necessary. |
| if options.enter: |
| options.create |= not chroot_exists |
| |
| if not options.sdk_version: |
| sdk_version = (bootstrap_latest_version if options.bootstrap |
| else sdk_latest_version) |
| else: |
| sdk_version = options.sdk_version |
| if options.buildbot_log_version: |
| cros_build_lib.PrintBuildbotStepText(sdk_version) |
| |
| # Based on selections, fetch the tarball. |
| if options.sdk_url: |
| urls = [options.sdk_url] |
| elif options.bootstrap: |
| urls = GetStage3Urls(sdk_version) |
| else: |
| urls = GetArchStageTarballs(sdk_version) |
| |
| lock_path = os.path.dirname(options.chroot) |
| lock_path = os.path.join(lock_path, |
| '.%s_lock' % os.path.basename(options.chroot)) |
| with cgroups.SimpleContainChildren('cros_sdk', pid=first_pid): |
| with locking.FileLock(lock_path, 'chroot lock') as lock: |
| |
| if options.proxy_sim: |
| _ProxySimSetup(options) |
| |
| if options.delete and os.path.exists(options.chroot): |
| lock.write_lock() |
| DeleteChroot(options.chroot) |
| |
| sdk_cache = os.path.join(options.cache_dir, 'sdks') |
| distfiles_cache = os.path.join(options.cache_dir, 'distfiles') |
| osutils.SafeMakedirsNonRoot(options.cache_dir) |
| |
| for target in (sdk_cache, distfiles_cache): |
| src = os.path.join(constants.SOURCE_ROOT, os.path.basename(target)) |
| if not os.path.exists(src): |
| osutils.SafeMakedirs(target) |
| continue |
| lock.write_lock( |
| "Upgrade to %r needed but chroot is locked; please exit " |
| "all instances so this upgrade can finish." % src) |
| if not os.path.exists(src): |
| # Note that while waiting for the write lock, src may've vanished; |
| # it's a rare race during the upgrade process that's a byproduct |
| # of us avoiding taking a write lock to do the src check. If we |
| # took a write lock for that check, it would effectively limit |
| # all cros_sdk for a chroot to a single instance. |
| osutils.SafeMakedirs(target) |
| elif not os.path.exists(target): |
| # Upgrade occurred, but a reversion, or something whacky |
| # occurred writing to the old location. Wipe and continue. |
| os.rename(src, target) |
| else: |
| # Upgrade occurred once already, but either a reversion or |
| # some before/after separate cros_sdk usage is at play. |
| # Wipe and continue. |
| osutils.RmDir(src) |
| |
| if options.download: |
| lock.write_lock() |
| sdk_tarball = FetchRemoteTarballs(sdk_cache, urls) |
| |
| if options.create: |
| lock.write_lock() |
| CreateChroot(options.chroot, sdk_tarball, options.cache_dir, |
| nousepkg=(options.bootstrap or options.nousepkg)) |
| |
| if options.enter: |
| lock.read_lock() |
| EnterChroot(options.chroot, options.cache_dir, options.chrome_root, |
| options.chrome_root_mount, chroot_command) |
