Exemple #1
0
def directory_create(args):
    """Unpacks the experiment in a folder.

    Only the files that are not part of a package are copied (unless they are
    missing from the system and were packed).

    In addition, input files are put in a tar.gz (so they can be put back after
    an upload) and the configuration file is extracted.
    """
    if not args.pack:
        logger.critical("setup needs the pack filename")
        sys.exit(1)

    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logger.critical("Target directory exists")
        sys.exit(1)

    if not issubclass(DefaultAbstractPath, PosixPath):
        logger.critical("Not unpacking on POSIX system")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    # Unpacks configuration file
    rpz_pack = RPZPack(pack)
    rpz_pack.extract_config(target / 'config.yml')

    # Loads config
    config = load_config_file(target / 'config.yml', True)
    packages = config.packages

    target.mkdir()
    root = (target / 'root').absolute()

    # Checks packages
    missing_files = False
    for pkg in packages:
        if pkg.packfiles:
            continue
        for f in pkg.files:
            if not Path(f.path).exists():
                logger.error(
                    "Missing file %s (from package %s that wasn't packed) "
                    "on host, experiment will probably miss it.",
                    f, pkg.name)
                missing_files = True
    if missing_files:
        record_usage(directory_missing_pkgs=True)
        logger.error("Some packages are missing, you should probably install "
                     "them.\nUse 'reprounzip installpkgs -h' for help")

    root.mkdir()
    try:
        # Unpacks files
        members = rpz_pack.list_data()
        for m in members:
            # Remove 'DATA/' prefix
            m.name = str(rpz_pack.remove_data_prefix(m.name))
            # Makes symlink targets relative
            if m.issym():
                linkname = PosixPath(m.linkname)
                if linkname.is_absolute:
                    m.linkname = join_root(root, PosixPath(m.linkname)).path
        logger.info("Extracting files...")
        rpz_pack.extract_data(root, members)
        rpz_pack.close()

        # Original input files, so upload can restore them
        input_files = [f.path for f in config.inputs_outputs.values()
                       if f.read_runs]
        if input_files:
            logger.info("Packing up original input files...")
            inputtar = tarfile.open(str(target / 'inputs.tar.gz'), 'w:gz')
            for ifile in input_files:
                filename = join_root(root, ifile)
                if filename.exists():
                    inputtar.add(str(filename), str(ifile))
            inputtar.close()

        # Meta-data for reprounzip
        metadata_write(target, metadata_initial_iofiles(config), 'directory')

        signals.post_setup(target=target, pack=pack)
    except Exception:
        rmtree_fixed(root)
        raise
Exemple #2
0
def docker_setup_create(args):
    """Sets up the experiment to be run in a Docker-built container.
    """
    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logging.critical("Target directory exists")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    target.mkdir()

    try:
        # Unpacks configuration file
        rpz_pack = RPZPack(pack)
        rpz_pack.extract_config(target / 'config.yml')

        # Loads config
        runs, packages, other_files = config = load_config(
            target / 'config.yml', True)

        if args.base_image:
            record_usage(docker_explicit_base=True)
            base_image = args.base_image[0]
            if args.distribution:
                target_distribution = args.distribution[0]
            else:
                target_distribution = None
        else:
            target_distribution, base_image = select_image(runs)
        logging.info("Using base image %s", base_image)
        logging.debug("Distribution: %s", target_distribution or "unknown")

        rpz_pack.copy_data_tar(target / 'data.tgz')

        arch = runs[0]['architecture']

        # Writes Dockerfile
        logging.info("Writing %s...", target / 'Dockerfile')
        with (target / 'Dockerfile').open('w', encoding='utf-8',
                                          newline='\n') as fp:
            fp.write('FROM %s\n\n' % base_image)

            # Installs busybox
            download_file(busybox_url(arch), target / 'busybox',
                          'busybox-%s' % arch)
            fp.write('COPY busybox /busybox\n')

            # Installs rpzsudo
            download_file(sudo_url(arch), target / 'rpzsudo',
                          'rpzsudo-%s' % arch)
            fp.write('COPY rpzsudo /rpzsudo\n\n')

            fp.write('COPY data.tgz /reprozip_data.tgz\n\n')
            fp.write('COPY rpz-files.list /rpz-files.list\n')
            fp.write('RUN \\\n' '    chmod +x /busybox /rpzsudo && \\\n')

            if args.install_pkgs:
                # Install every package through package manager
                missing_packages = []
            else:
                # Only install packages that were not packed
                missing_packages = [pkg for pkg in packages if pkg.packfiles]
                packages = [pkg for pkg in packages if not pkg.packfiles]
            if packages:
                record_usage(docker_install_pkgs=True)
                try:
                    installer = select_installer(pack, runs,
                                                 target_distribution)
                except CantFindInstaller as e:
                    logging.error(
                        "Need to install %d packages but couldn't "
                        "select a package installer: %s", len(packages), e)
                    sys.exit(1)
                # Updates package sources
                update_script = installer.update_script()
                if update_script:
                    fp.write('    %s && \\\n' % update_script)
                # Installs necessary packages
                fp.write('    %s && \\\n' % installer.install_script(packages))
                logging.info(
                    "Dockerfile will install the %d software "
                    "packages that were not packed", len(packages))
            else:
                record_usage(docker_install_pkgs=False)

            # Untar
            paths = set()
            pathlist = []
            # Add intermediate directories, and check for existence in the tar
            missing_files = chain.from_iterable(pkg.files
                                                for pkg in missing_packages)
            data_files = rpz_pack.data_filenames()
            listoffiles = list(chain(other_files, missing_files))
            for f in listoffiles:
                path = PosixPath('/')
                for c in rpz_pack.remove_data_prefix(f.path).components:
                    path = path / c
                    if path in paths:
                        continue
                    paths.add(path)
                    if path in data_files:
                        pathlist.append(path)
                    else:
                        logging.info("Missing file %s", path)
            rpz_pack.close()
            # FIXME : for some reason we need reversed() here, I'm not sure why
            # Need to read more of tar's docs.
            # TAR bug: --no-overwrite-dir removes --keep-old-files
            with (target / 'rpz-files.list').open('wb') as lfp:
                for p in reversed(pathlist):
                    lfp.write(join_root(rpz_pack.data_prefix, p).path)
                    lfp.write(b'\0')
            fp.write('    cd / && '
                     '(tar zpxf /reprozip_data.tgz -U --recursive-unlink '
                     '--numeric-owner --strip=1 --null -T /rpz-files.list || '
                     '/busybox echo "TAR reports errors, this might or might '
                     'not prevent the execution to run")\n')

        # Meta-data for reprounzip
        write_dict(target, metadata_initial_iofiles(config))

        signals.post_setup(target=target, pack=pack)
    except Exception:
        target.rmtree(ignore_errors=True)
        raise
Exemple #3
0
def chroot_create(args):
    """Unpacks the experiment in a folder so it can be run with chroot.

    All the files in the pack are unpacked; system files are copied only if
    they were not packed, and busybox is installed if /bin/sh wasn't packed.

    In addition, input files are put in a tar.gz (so they can be put back after
    an upload) and the configuration file is extracted.
    """
    if not args.pack:
        logger.critical("setup/create needs the pack filename")
        sys.exit(1)

    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logger.critical("Target directory exists")
        sys.exit(1)

    if not issubclass(DefaultAbstractPath, PosixPath):
        logger.critical("Not unpacking on POSIX system")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    # We can only restore owner/group of files if running as root
    restore_owner = should_restore_owner(args.restore_owner)

    # Unpacks configuration file
    rpz_pack = RPZPack(pack)
    rpz_pack.extract_config(target / 'config.yml')

    # Loads config
    config = load_config_file(target / 'config.yml', True)
    packages = config.packages

    target.mkdir()
    root = (target / 'root').absolute()

    root.mkdir()
    try:
        # Checks that everything was packed
        packages_not_packed = [pkg for pkg in packages if not pkg.packfiles]
        if packages_not_packed:
            record_usage(chroot_missing_pkgs=True)
            logger.warning("According to configuration, some files were left "
                           "out because they belong to the following "
                           "packages:%s\nWill copy files from HOST SYSTEM",
                           ''.join('\n    %s' % pkg
                                   for pkg in packages_not_packed))
            missing_files = False
            for pkg in packages_not_packed:
                for f in pkg.files:
                    path = Path(f.path)
                    if not path.exists():
                        logger.error(
                            "Missing file %s (from package %s) on host, "
                            "experiment will probably miss it",
                            path, pkg.name)
                        missing_files = True
                        continue
                    dest = join_root(root, path)
                    dest.parent.mkdir(parents=True)
                    if path.is_link():
                        dest.symlink(path.read_link())
                    else:
                        path.copy(dest)
                    if restore_owner:
                        stat = path.stat()
                        dest.chown(stat.st_uid, stat.st_gid)
            if missing_files:
                record_usage(chroot_mising_files=True)

        # Unpacks files
        members = rpz_pack.list_data()
        for m in members:
            # Remove 'DATA/' prefix
            m.name = str(rpz_pack.remove_data_prefix(m.name))
        if not restore_owner:
            uid = os.getuid()
            gid = os.getgid()
            for m in members:
                m.uid = uid
                m.gid = gid
        logger.info("Extracting files...")
        rpz_pack.extract_data(root, members)
        rpz_pack.close()

        resolvconf_src = Path('/etc/resolv.conf')
        if resolvconf_src.exists():
            try:
                resolvconf_src.copy(root / 'etc/resolv.conf')
            except IOError:
                pass

        # Sets up /bin/sh and /usr/bin/env, downloading busybox if necessary
        sh_path = join_root(root, Path('/bin/sh'))
        env_path = join_root(root, Path('/usr/bin/env'))
        if not sh_path.lexists() or not env_path.lexists():
            logger.info("Setting up busybox...")
            busybox_path = join_root(root, Path('/bin/busybox'))
            busybox_path.parent.mkdir(parents=True)
            with make_dir_writable(join_root(root, Path('/bin'))):
                download_file(busybox_url(config.runs[0]['architecture']),
                              busybox_path,
                              'busybox-%s' % config.runs[0]['architecture'])
                busybox_path.chmod(0o755)
                if not sh_path.lexists():
                    sh_path.parent.mkdir(parents=True)
                    sh_path.symlink('/bin/busybox')
                if not env_path.lexists():
                    env_path.parent.mkdir(parents=True)
                    env_path.symlink('/bin/busybox')

        # Original input files, so upload can restore them
        input_files = [f.path for f in config.inputs_outputs.values()
                       if f.read_runs]
        if input_files:
            logger.info("Packing up original input files...")
            inputtar = tarfile.open(str(target / 'inputs.tar.gz'), 'w:gz')
            for ifile in input_files:
                filename = join_root(root, ifile)
                if filename.exists():
                    inputtar.add(str(filename), str(ifile))
            inputtar.close()

        # Meta-data for reprounzip
        metadata_write(target, metadata_initial_iofiles(config), 'chroot')

        signals.post_setup(target=target, pack=pack)
    except Exception:
        rmtree_fixed(root)
        raise
Exemple #4
0
def docker_setup_create(args):
    """Sets up the experiment to be run in a Docker-built container.
    """
    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logging.critical("Target directory exists")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    target.mkdir()

    try:
        # Unpacks configuration file
        rpz_pack = RPZPack(pack)
        rpz_pack.extract_config(target / 'config.yml')

        # Loads config
        runs, packages, other_files = config = load_config(
            target / 'config.yml', True)

        if args.base_image:
            record_usage(docker_explicit_base=True)
            base_image = args.base_image[0]
            if args.distribution:
                target_distribution = args.distribution[0]
            else:
                target_distribution = None
        else:
            target_distribution, base_image = select_image(runs)
        logging.info("Using base image %s", base_image)
        logging.debug("Distribution: %s", target_distribution or "unknown")

        rpz_pack.copy_data_tar(target / 'data.tgz')

        arch = runs[0]['architecture']

        # Writes Dockerfile
        logging.info("Writing %s...", target / 'Dockerfile')
        with (target / 'Dockerfile').open('w', encoding='utf-8',
                                          newline='\n') as fp:
            fp.write('FROM %s\n\n' % base_image)

            # Installs busybox
            download_file(busybox_url(arch),
                          target / 'busybox',
                          'busybox-%s' % arch)
            fp.write('COPY busybox /busybox\n')

            # Installs rpzsudo
            download_file(sudo_url(arch),
                          target / 'rpzsudo',
                          'rpzsudo-%s' % arch)
            fp.write('COPY rpzsudo /rpzsudo\n\n')

            fp.write('COPY data.tgz /reprozip_data.tgz\n\n')
            fp.write('COPY rpz-files.list /rpz-files.list\n')
            fp.write('RUN \\\n'
                     '    chmod +x /busybox /rpzsudo && \\\n')

            if args.install_pkgs:
                # Install every package through package manager
                missing_packages = []
            else:
                # Only install packages that were not packed
                missing_packages = [pkg for pkg in packages if pkg.packfiles]
                packages = [pkg for pkg in packages if not pkg.packfiles]
            if packages:
                record_usage(docker_install_pkgs=True)
                try:
                    installer = select_installer(pack, runs,
                                                 target_distribution)
                except CantFindInstaller as e:
                    logging.error("Need to install %d packages but couldn't "
                                  "select a package installer: %s",
                                  len(packages), e)
                    sys.exit(1)
                # Updates package sources
                update_script = installer.update_script()
                if update_script:
                    fp.write('    %s && \\\n' % update_script)
                # Installs necessary packages
                fp.write('    %s && \\\n' % installer.install_script(packages))
                logging.info("Dockerfile will install the %d software "
                             "packages that were not packed", len(packages))
            else:
                record_usage(docker_install_pkgs=False)

            # Untar
            paths = set()
            pathlist = []
            # Add intermediate directories, and check for existence in the tar
            logging.info("Generating file list...")
            missing_files = chain.from_iterable(pkg.files
                                                for pkg in missing_packages)
            data_files = rpz_pack.data_filenames()
            listoffiles = list(chain(other_files, missing_files))
            for f in listoffiles:
                if f.path.name == 'resolv.conf' and (
                        f.path.lies_under('/etc') or
                        f.path.lies_under('/run') or
                        f.path.lies_under('/var')):
                    continue
                path = PosixPath('/')
                for c in rpz_pack.remove_data_prefix(f.path).components:
                    path = path / c
                    if path in paths:
                        continue
                    paths.add(path)
                    if path in data_files:
                        pathlist.append(path)
                    else:
                        logging.info("Missing file %s", path)
            rpz_pack.close()
            # FIXME : for some reason we need reversed() here, I'm not sure why
            # Need to read more of tar's docs.
            # TAR bug: --no-overwrite-dir removes --keep-old-files
            with (target / 'rpz-files.list').open('wb') as lfp:
                for p in reversed(pathlist):
                    lfp.write(join_root(rpz_pack.data_prefix, p).path)
                    lfp.write(b'\0')
            fp.write('    cd / && '
                     '(tar zpxf /reprozip_data.tgz -U --recursive-unlink '
                     '--numeric-owner --strip=1 --null -T /rpz-files.list || '
                     '/busybox echo "TAR reports errors, this might or might '
                     'not prevent the execution to run")\n')

            # Setup entry point
            fp.write('COPY rpz_entrypoint.sh /rpz_entrypoint.sh\n'
                     'ENTRYPOINT ["/busybox", "sh", "/rpz_entrypoint.sh"]\n')

        # Write entry point script
        logging.info("Writing %s...", target / 'rpz_entrypoint.sh')
        with (target / 'rpz_entrypoint.sh').open('w', encoding='utf-8',
                                                 newline='\n') as fp:
            # The entrypoint gets some arguments from the run command
            # By default, it just does all the runs
            # "run N" executes the run with that number
            # "cmd STR" sets a replacement command-line for the next run
            # "do STR" executes a command as-is
            fp.write(
                '#!/bin/sh\n'
                '\n'
                'COMMAND=\n'
                'ENVVARS=\n'
                '\n'
                'if [ $# = 0 ]; then\n'
                '    exec /busybox sh /rpz_entrypoint.sh')
            for nb in irange(len(runs)):
                fp.write(' run %d' % nb)
            fp.write(
                '\n'
                'fi\n'
                '\n'
                'while [ $# != 0 ]; do\n'
                '    case "$1" in\n'
                '        help)\n'
                '            echo "Image built from reprounzip-docker" >&2\n'
                '            echo "Usage: docker run <image> [cmd word [word '
                '...]] [run <R>]" >&2\n'
                '            echo "    \\`cmd ...\\` changes the command for '
                'the next \\`run\\` option" >&2\n'
                '            echo "    \\`run <name|number>\\` runs the '
                'specified run" >&2\n'
                '            echo "By default, all the runs are executed." '
                '>&2\n'
                '            echo "The runs in this image are:" >&2\n')
            for run in runs:
                fp.write(
                    '            echo "    {name}: {cmdline}" >&2\n'.format(
                        name=run['id'],
                        cmdline=' '.join(shell_escape(a)
                                         for a in run['argv'])))
            fp.write(
                '            exit 0\n'
                '        ;;\n'
                '        do)\n'
                '            shift\n'
                '            $1\n'
                '        ;;\n'
                '        env)\n'
                '            shift\n'
                '            ENVVARS="$1"\n'
                '        ;;\n'
                '        cmd)\n'
                '            shift\n'
                '            COMMAND="$1"\n'
                '        ;;\n'
                '        run)\n'
                '            shift\n'
                '            case "$1" in\n')
            for i, run in enumerate(runs):
                cmdline = ' '.join([run['binary']] + run['argv'][1:])
                fp.write(
                    '                {name})\n'
                    '                    RUNCOMMAND={cmd}\n'
                    '                    RUNWD={wd}\n'
                    '                    RUNENV={env}\n'
                    '                    RUNUID={uid}\n'
                    '                    RUNGID={gid}\n'
                    '                ;;\n'.format(
                        name='%s|%d' % (run['id'], i),
                        cmd=shell_escape(cmdline),
                        wd=shell_escape(run['workingdir']),
                        env=shell_escape(' '.join(
                            '%s=%s' % (shell_escape(k), shell_escape(v))
                            for k, v in iteritems(run['environ']))),
                        uid=run.get('uid', 1000),
                        gid=run.get('gid', 1000)))
            fp.write(
                '                *)\n'
                '                    echo "RPZ: Unknown run $1" >&2\n'
                '                    exit 1\n'
                '                ;;\n'
                '            esac\n'
                '            if [ -n "$COMMAND" ]; then\n'
                '                RUNCOMMAND="$COMMAND"\n'
                '                COMMAND=\n'
                '            fi\n'
                '            export RUNWD; export RUNENV; export ENVVARS; '
                'export RUNCOMMAND\n'
                '            /rpzsudo "#$RUNUID" "#$RUNGID" /busybox sh -c '
                '"cd \\"\\$RUNWD\\" && /busybox env -i $RUNENV $ENVVARS '
                '$RUNCOMMAND"\n'
                '            ENVVARS=\n'
                '        ;;\n'
                '        *)\n'
                '            echo "RPZ: Unknown option $1" >&2\n'
                '            exit 1\n'
                '        ;;\n'
                '    esac\n'
                '    shift\n'
                'done\n')

        # Meta-data for reprounzip
        write_dict(target, metadata_initial_iofiles(config))

        signals.post_setup(target=target, pack=pack)
    except Exception:
        target.rmtree(ignore_errors=True)
        raise
Exemple #5
0
def vagrant_setup_create(args):
    """Sets up the experiment to be run in a Vagrant-built virtual machine.

    This can either build a chroot or not.

    If building a chroot, we do just like without Vagrant: we copy all the
    files and only get what's missing from the host. But we do install
    automatically the packages whose files are required.

    If not building a chroot, we install all the packages, and only unpack
    files that don't come from packages.

    In short: files from packages with packfiles=True will only be used if
    building a chroot.
    """
    if not args.pack:
        logging.critical("setup/create needs the pack filename")
        sys.exit(1)

    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logging.critical("Target directory exists")
        sys.exit(1)
    use_chroot = args.use_chroot
    mount_bind = args.bind_magic_dirs
    record_usage(use_chroot=use_chroot,
                 mount_bind=mount_bind)

    signals.pre_setup(target=target, pack=pack)

    # Unpacks configuration file
    rpz_pack = RPZPack(pack)
    rpz_pack.extract_config(target / 'config.yml')

    # Loads config
    runs, packages, other_files = config = load_config(target / 'config.yml',
                                                       True)

    if not args.memory:
        memory = None
    else:
        try:
            memory = int(args.memory[-1])
        except ValueError:
            logging.critical("Invalid value for memory size: %r", args.memory)
            sys.exit(1)

    if args.base_image and args.base_image[0]:
        record_usage(vagrant_explicit_image=True)
        box = args.base_image[0]
        if args.distribution:
            target_distribution = args.distribution[0]
        else:
            target_distribution = None
    else:
        target_distribution, box = select_box(runs)
    logging.info("Using box %s", box)
    logging.debug("Distribution: %s", target_distribution or "unknown")

    # If using chroot, we might still need to install packages to get missing
    # (not packed) files
    if use_chroot:
        packages = [pkg for pkg in packages if not pkg.packfiles]
        if packages:
            record_usage(vagrant_install_pkgs=True)
            logging.info("Some packages were not packed, so we'll install and "
                         "copy their files\n"
                         "Packages that are missing:\n%s",
                         ' '.join(pkg.name for pkg in packages))

    if packages:
        try:
            installer = select_installer(pack, runs, target_distribution)
        except CantFindInstaller as e:
            logging.error("Need to install %d packages but couldn't select a "
                          "package installer: %s",
                          len(packages), e)

    target.mkdir(parents=True)

    try:
        # Writes setup script
        logging.info("Writing setup script %s...", target / 'setup.sh')
        with (target / 'setup.sh').open('w', encoding='utf-8',
                                        newline='\n') as fp:
            fp.write('#!/bin/sh\n\nset -e\n\n')
            if packages:
                # Updates package sources
                fp.write(installer.update_script())
                fp.write('\n')
                # Installs necessary packages
                fp.write(installer.install_script(packages))
                fp.write('\n')
                # TODO : Compare package versions (painful because of sh)

            # Untar
            if use_chroot:
                fp.write('\n'
                         'mkdir /experimentroot; cd /experimentroot\n')
                fp.write('tar zpxf /vagrant/data.tgz --numeric-owner '
                         '--strip=1 %s\n' % rpz_pack.data_prefix)
                if mount_bind:
                    fp.write('\n'
                             'mkdir -p /experimentroot/dev\n'
                             'mkdir -p /experimentroot/proc\n')

                for pkg in packages:
                    fp.write('\n# Copies files from package %s\n' % pkg.name)
                    for f in pkg.files:
                        f = f.path
                        dest = join_root(PosixPath('/experimentroot'), f)
                        fp.write('mkdir -p %s\n' %
                                 shell_escape(unicode_(f.parent)))
                        fp.write('cp -L %s %s\n' % (
                                 shell_escape(unicode_(f)),
                                 shell_escape(unicode_(dest))))
            else:
                fp.write('\ncd /\n')
                paths = set()
                pathlist = []
                # Adds intermediate directories, and checks for existence in
                # the tar
                for f in other_files:
                    path = PosixPath('/')
                    for c in rpz_pack.remove_data_prefix(f.path).components:
                        path = path / c
                        if path in paths:
                            continue
                        paths.add(path)
                        try:
                            rpz_pack.get_data(path)
                        except KeyError:
                            logging.info("Missing file %s", path)
                        else:
                            pathlist.append(path)
                # FIXME : for some reason we need reversed() here, I'm not sure
                # why. Need to read more of tar's docs.
                # TAR bug: --no-overwrite-dir removes --keep-old-files
                # TAR bug: there is no way to make --keep-old-files not report
                # an error if an existing file is encountered. --skip-old-files
                # was introduced too recently. Instead, we just ignore the exit
                # status
                with (target / 'rpz-files.list').open('wb') as lfp:
                    for p in reversed(pathlist):
                        lfp.write(join_root(rpz_pack.data_prefix, p).path)
                        lfp.write(b'\0')
                fp.write('tar zpxf /vagrant/data.tgz --keep-old-files '
                         '--numeric-owner --strip=1 '
                         '--null -T /vagrant/rpz-files.list || /bin/true\n')

            # Copies busybox
            if use_chroot:
                arch = runs[0]['architecture']
                download_file(busybox_url(arch),
                              target / 'busybox',
                              'busybox-%s' % arch)
                fp.write(r'''
cp /vagrant/busybox /experimentroot/busybox
chmod +x /experimentroot/busybox
mkdir -p /experimentroot/bin
[ -e /experimentroot/bin/sh ] || \
    ln -s /busybox /experimentroot/bin/sh
''')

        # Copies pack
        logging.info("Copying pack file...")
        rpz_pack.copy_data_tar(target / 'data.tgz')

        rpz_pack.close()

        # Writes Vagrant file
        logging.info("Writing %s...", target / 'Vagrantfile')
        with (target / 'Vagrantfile').open('w', encoding='utf-8',
                                           newline='\n') as fp:
            # Vagrant header and version
            fp.write(
                '# -*- mode: ruby -*-\n'
                '# vi: set ft=ruby\n\n'
                'VAGRANTFILE_API_VERSION = "2"\n\n'
                'Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|\n')
            # Selects which box to install
            fp.write('  config.vm.box = "%s"\n' % box)
            # Run the setup script on the virtual machine
            fp.write('  config.vm.provision "shell", path: "setup.sh"\n')

            # Memory size
            if memory is not None:
                fp.write('  config.vm.provider "virtualbox" do |v|\n'
                         '    v.memory = %d\n'
                         '  end\n' % memory)

            fp.write('end\n')

        # Meta-data for reprounzip
        write_dict(target,
                   metadata_initial_iofiles(config,
                                            {'use_chroot': use_chroot}))

        signals.post_setup(target=target, pack=pack)
    except Exception:
        target.rmtree(ignore_errors=True)
        raise
Exemple #6
0
def directory_create(args):
    """Unpacks the experiment in a folder.

    Only the files that are not part of a package are copied (unless they are
    missing from the system and were packed).

    In addition, input files are put in a tar.gz (so they can be put back after
    an upload) and the configuration file is extracted.
    """
    if not args.pack:
        logging.critical("setup needs the pack filename")
        sys.exit(1)

    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logging.critical("Target directory exists")
        sys.exit(1)

    if not issubclass(DefaultAbstractPath, PosixPath):
        logging.critical("Not unpacking on POSIX system")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    # Unpacks configuration file
    rpz_pack = RPZPack(pack)
    rpz_pack.extract_config(target / 'config.yml')

    # Loads config
    config = load_config_file(target / 'config.yml', True)
    packages = config.packages

    target.mkdir()
    root = (target / 'root').absolute()

    # Checks packages
    missing_files = False
    for pkg in packages:
        if pkg.packfiles:
            continue
        for f in pkg.files:
            if not Path(f.path).exists():
                logging.error(
                    "Missing file %s (from package %s that wasn't packed) "
                    "on host, experiment will probably miss it.",
                    f, pkg.name)
                missing_files = True
    if missing_files:
        record_usage(directory_missing_pkgs=True)
        logging.error("Some packages are missing, you should probably install "
                      "them.\nUse 'reprounzip installpkgs -h' for help")

    root.mkdir()
    try:
        # Unpacks files
        members = rpz_pack.list_data()
        for m in members:
            # Remove 'DATA/' prefix
            m.name = str(rpz_pack.remove_data_prefix(m.name))
            # Makes symlink targets relative
            if m.issym():
                linkname = PosixPath(m.linkname)
                if linkname.is_absolute:
                    m.linkname = join_root(root, PosixPath(m.linkname)).path
        logging.info("Extracting files...")
        rpz_pack.extract_data(root, members)
        rpz_pack.close()

        # Original input files, so upload can restore them
        input_files = [f.path for f in itervalues(config.inputs_outputs)
                       if f.read_runs]
        if input_files:
            logging.info("Packing up original input files...")
            inputtar = tarfile.open(str(target / 'inputs.tar.gz'), 'w:gz')
            for ifile in input_files:
                filename = join_root(root, ifile)
                if filename.exists():
                    inputtar.add(str(filename), str(ifile))
            inputtar.close()

        # Meta-data for reprounzip
        metadata_write(target, metadata_initial_iofiles(config), 'directory')

        signals.post_setup(target=target, pack=pack)
    except Exception:
        rmtree_fixed(root)
        raise
Exemple #7
0
def chroot_create(args):
    """Unpacks the experiment in a folder so it can be run with chroot.

    All the files in the pack are unpacked; system files are copied only if
    they were not packed, and busybox is installed if /bin/sh wasn't packed.

    In addition, input files are put in a tar.gz (so they can be put back after
    an upload) and the configuration file is extracted.
    """
    if not args.pack:
        logging.critical("setup/create needs the pack filename")
        sys.exit(1)

    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logging.critical("Target directory exists")
        sys.exit(1)

    if DefaultAbstractPath is not PosixPath:
        logging.critical("Not unpacking on POSIX system")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    # We can only restore owner/group of files if running as root
    restore_owner = should_restore_owner(args.restore_owner)

    # Unpacks configuration file
    rpz_pack = RPZPack(pack)
    rpz_pack.extract_config(target / 'config.yml')

    # Loads config
    config = load_config_file(target / 'config.yml', True)
    packages = config.packages

    target.mkdir()
    root = (target / 'root').absolute()

    root.mkdir()
    try:
        # Checks that everything was packed
        packages_not_packed = [pkg for pkg in packages if not pkg.packfiles]
        if packages_not_packed:
            record_usage(chroot_missing_pkgs=True)
            logging.warning("According to configuration, some files were left "
                            "out because they belong to the following "
                            "packages:%s\nWill copy files from HOST SYSTEM",
                            ''.join('\n    %s' % pkg
                                    for pkg in packages_not_packed))
            missing_files = False
            for pkg in packages_not_packed:
                for f in pkg.files:
                    path = Path(f.path)
                    if not path.exists():
                        logging.error(
                            "Missing file %s (from package %s) on host, "
                            "experiment will probably miss it",
                            path, pkg.name)
                        missing_files = True
                        continue
                    dest = join_root(root, path)
                    dest.parent.mkdir(parents=True)
                    if path.is_link():
                        dest.symlink(path.read_link())
                    else:
                        path.copy(dest)
                    if restore_owner:
                        stat = path.stat()
                        dest.chown(stat.st_uid, stat.st_gid)
            if missing_files:
                record_usage(chroot_mising_files=True)

        # Unpacks files
        members = rpz_pack.list_data()
        for m in members:
            # Remove 'DATA/' prefix
            m.name = str(rpz_pack.remove_data_prefix(m.name))
        if not restore_owner:
            uid = os.getuid()
            gid = os.getgid()
            for m in members:
                m.uid = uid
                m.gid = gid
        logging.info("Extracting files...")
        rpz_pack.extract_data(root, members)
        rpz_pack.close()

        # Sets up /bin/sh and /usr/bin/env, downloading busybox if necessary
        sh_path = join_root(root, Path('/bin/sh'))
        env_path = join_root(root, Path('/usr/bin/env'))
        if not sh_path.lexists() or not env_path.lexists():
            logging.info("Setting up busybox...")
            busybox_path = join_root(root, Path('/bin/busybox'))
            busybox_path.parent.mkdir(parents=True)
            with make_dir_writable(join_root(root, Path('/bin'))):
                download_file(busybox_url(config.runs[0]['architecture']),
                              busybox_path,
                              'busybox-%s' % config.runs[0]['architecture'])
                busybox_path.chmod(0o755)
                if not sh_path.lexists():
                    sh_path.parent.mkdir(parents=True)
                    sh_path.symlink('/bin/busybox')
                if not env_path.lexists():
                    env_path.parent.mkdir(parents=True)
                    env_path.symlink('/bin/busybox')

        # Original input files, so upload can restore them
        input_files = [f.path for f in itervalues(config.inputs_outputs)
                       if f.read_runs]
        if input_files:
            logging.info("Packing up original input files...")
            inputtar = tarfile.open(str(target / 'inputs.tar.gz'), 'w:gz')
            for ifile in input_files:
                filename = join_root(root, ifile)
                if filename.exists():
                    inputtar.add(str(filename), str(ifile))
            inputtar.close()

        # Meta-data for reprounzip
        metadata_write(target, metadata_initial_iofiles(config), 'chroot')

        signals.post_setup(target=target, pack=pack)
    except Exception:
        rmtree_fixed(root)
        raise
def docker_setup_create(args):
    """Sets up the experiment to be run in a Docker-built container.
    """
    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logger.critical("Target directory exists")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    target.mkdir()

    try:
        # Unpacks configuration file
        rpz_pack = RPZPack(pack)
        rpz_pack.extract_config(target / 'config.yml')

        # Loads config
        runs, packages, other_files = config = load_config(
            target / 'config.yml', True)

        if args.base_image:
            record_usage(docker_explicit_base=True)
            base_image = args.base_image[0]
            if args.distribution:
                target_distribution = args.distribution[0]
            else:
                target_distribution = None
        else:
            target_distribution, base_image = select_image(runs)
        logger.info("Using base image %s", base_image)
        logger.debug("Distribution: %s", target_distribution or "unknown")

        rpz_pack.copy_data_tar(target / 'data.tgz')

        arch = runs[0]['architecture']

        # Writes Dockerfile
        logger.info("Writing %s...", target / 'Dockerfile')
        with (target / 'Dockerfile').open('w', encoding='utf-8',
                                          newline='\n') as fp:
            fp.write('FROM %s\n\n' % base_image)

            # Installs busybox
            download_file(busybox_url(arch),
                          target / 'busybox',
                          'busybox-%s' % arch)
            fp.write('COPY busybox /busybox\n')

            # Installs rpzsudo
            download_file(sudo_url(arch),
                          target / 'rpzsudo',
                          'rpzsudo-%s' % arch)
            fp.write('COPY rpzsudo /rpzsudo\n\n')

            fp.write('COPY data.tgz /reprozip_data.tgz\n\n')
            fp.write('COPY rpz-files.list /rpz-files.list\n')
            fp.write('RUN \\\n'
                     '    chmod +x /busybox /rpzsudo && \\\n')

            if args.install_pkgs:
                # Install every package through package manager
                missing_packages = []
            else:
                # Only install packages that were not packed
                missing_packages = [pkg for pkg in packages if pkg.packfiles]
                packages = [pkg for pkg in packages if not pkg.packfiles]
            if packages:
                record_usage(docker_install_pkgs=True)
                try:
                    installer = select_installer(pack, runs,
                                                 target_distribution)
                except CantFindInstaller as e:
                    logger.error("Need to install %d packages but couldn't "
                                 "select a package installer: %s",
                                 len(packages), e)
                    sys.exit(1)
                # Updates package sources
                update_script = installer.update_script()
                if update_script:
                    fp.write('    %s && \\\n' % update_script)
                # Installs necessary packages
                fp.write('    %s && \\\n' % installer.install_script(packages))
                logger.info("Dockerfile will install the %d software "
                            "packages that were not packed", len(packages))
            else:
                record_usage(docker_install_pkgs=False)

            # Untar
            paths = set()
            pathlist = []
            # Add intermediate directories, and check for existence in the tar
            logger.info("Generating file list...")
            missing_files = chain.from_iterable(pkg.files
                                                for pkg in missing_packages)
            data_files = rpz_pack.data_filenames()
            listoffiles = list(chain(other_files, missing_files))
            for f in listoffiles:
                if f.path.name == 'resolv.conf' and (
                        f.path.lies_under('/etc') or
                        f.path.lies_under('/run') or
                        f.path.lies_under('/var')):
                    continue
                path = PosixPath('/')
                for c in rpz_pack.remove_data_prefix(f.path).components:
                    path = path / c
                    if path in paths:
                        continue
                    paths.add(path)
                    if path in data_files:
                        pathlist.append(path)
                    else:
                        logger.info("Missing file %s", path)
            rpz_pack.close()
            # FIXME : for some reason we need reversed() here, I'm not sure why
            # Need to read more of tar's docs.
            # TAR bug: --no-overwrite-dir removes --keep-old-files
            with (target / 'rpz-files.list').open('wb') as lfp:
                for p in reversed(pathlist):
                    lfp.write(join_root(rpz_pack.data_prefix, p).path)
                    lfp.write(b'\0')
            fp.write('    cd / && '
                     '(tar zpxf /reprozip_data.tgz -U --recursive-unlink '
                     '--numeric-owner --strip=1 --null -T /rpz-files.list || '
                     '/busybox echo "TAR reports errors, this might or might '
                     'not prevent the execution to run")\n')

            # Setup entry point
            fp.write('COPY rpz_entrypoint.sh /rpz_entrypoint.sh\n'
                     'ENTRYPOINT ["/busybox", "sh", "/rpz_entrypoint.sh"]\n')

        # Write entry point script
        logger.info("Writing %s...", target / 'rpz_entrypoint.sh')
        with (target / 'rpz_entrypoint.sh').open('w', encoding='utf-8',
                                                 newline='\n') as fp:
            # The entrypoint gets some arguments from the run command
            # By default, it just does all the runs
            # "run N" executes the run with that number
            # "cmd STR" sets a replacement command-line for the next run
            # "do STR" executes a command as-is
            fp.write(
                '#!/bin/sh\n'
                '\n'
                'COMMAND=\n'
                'ENVVARS=\n'
                '\n'
                'if [ $# = 0 ]; then\n'
                '    exec /busybox sh /rpz_entrypoint.sh')
            for nb in irange(len(runs)):
                fp.write(' run %d' % nb)
            fp.write(
                '\n'
                'fi\n'
                '\n'
                'while [ $# != 0 ]; do\n'
                '    case "$1" in\n'
                '        help)\n'
                '            echo "Image built from reprounzip-docker" >&2\n'
                '            echo "Usage: docker run <image> [cmd "word [word '
                '...]"] [run <R>]" >&2\n'
                '            echo "    \\`cmd ...\\` changes the command for '
                'the next \\`run\\` option" >&2\n'
                '            echo "    \\`run <name|number>\\` runs the '
                'specified run" >&2\n'
                '            echo "By default, all the runs are executed." '
                '>&2\n'
                '            echo "The runs in this image are:" >&2\n')
            for run in runs:
                fp.write(
                    '            echo "    {name}: {cmdline}" >&2\n'.format(
                        name=run['id'],
                        cmdline=' '.join(shell_escape(a)
                                         for a in run['argv'])))
            fp.write(
                '            exit 0\n'
                '        ;;\n'
                '        do)\n'
                '            shift\n'
                '            $1\n'
                '        ;;\n'
                '        env)\n'
                '            shift\n'
                '            ENVVARS="$1"\n'
                '        ;;\n'
                '        cmd)\n'
                '            shift\n'
                '            COMMAND="$1"\n'
                '        ;;\n'
                '        run)\n'
                '            shift\n'
                '            case "$1" in\n')
            for i, run in enumerate(runs):
                cmdline = ' '.join([run['binary']] + run['argv'][1:])
                fp.write(
                    '                {name})\n'
                    '                    RUNCOMMAND={cmd}\n'
                    '                    RUNWD={wd}\n'
                    '                    RUNENV={env}\n'
                    '                    RUNUID={uid}\n'
                    '                    RUNGID={gid}\n'
                    '                ;;\n'.format(
                        name='%s|%d' % (run['id'], i),
                        cmd=shell_escape(cmdline),
                        wd=shell_escape(run['workingdir']),
                        env=shell_escape(' '.join(
                            '%s=%s' % (shell_escape(k), shell_escape(v))
                            for k, v in iteritems(run['environ']))),
                        uid=run.get('uid', 1000),
                        gid=run.get('gid', 1000)))
            fp.write(
                '                *)\n'
                '                    echo "RPZ: Unknown run $1" >&2\n'
                '                    exit 1\n'
                '                ;;\n'
                '            esac\n'
                '            if [ -n "$COMMAND" ]; then\n'
                '                RUNCOMMAND="$COMMAND"\n'
                '                COMMAND=\n'
                '            fi\n'
                '            export RUNWD; export RUNENV; export ENVVARS; '
                'export RUNCOMMAND\n'
                '            /rpzsudo "#$RUNUID" "#$RUNGID" /busybox sh -c '
                '"cd \\"\\$RUNWD\\" && /busybox env -i $RUNENV $ENVVARS '
                '$RUNCOMMAND; echo \\"*** Command finished, status: \\$?\\""\n'
                '            ENVVARS=\n'
                '        ;;\n'
                '        *)\n'
                '            echo "RPZ: Unknown option $1" >&2\n'
                '            exit 1\n'
                '        ;;\n'
                '    esac\n'
                '    shift\n'
                'done\n')

        # Meta-data for reprounzip
        write_dict(target, metadata_initial_iofiles(config))

        signals.post_setup(target=target, pack=pack)
    except Exception:
        target.rmtree(ignore_errors=True)
        raise
Exemple #9
0
def vagrant_setup_create(args):
    """Sets up the experiment to be run in a Vagrant-built virtual machine.

    This can either build a chroot or not.

    If building a chroot, we do just like without Vagrant: we copy all the
    files and only get what's missing from the host. But we do install
    automatically the packages whose files are required.

    If not building a chroot, we install all the packages, and only unpack
    files that don't come from packages.

    In short: files from packages with packfiles=True will only be used if
    building a chroot.
    """
    if not args.pack:
        logging.critical("setup/create needs the pack filename")
        sys.exit(1)

    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logging.critical("Target directory exists")
        sys.exit(1)
    use_chroot = args.use_chroot
    mount_bind = args.bind_magic_dirs
    record_usage(use_chroot=use_chroot,
                 mount_bind=mount_bind)

    signals.pre_setup(target=target, pack=pack)

    # Unpacks configuration file
    rpz_pack = RPZPack(pack)
    rpz_pack.extract_config(target / 'config.yml')

    # Loads config
    runs, packages, other_files = config = load_config(target / 'config.yml',
                                                       True)

    if not args.memory:
        memory = None
    else:
        try:
            memory = int(args.memory[-1])
        except ValueError:
            logging.critical("Invalid value for memory size: %r", args.memory)
            sys.exit(1)

    if args.base_image and args.base_image[0]:
        record_usage(vagrant_explicit_image=True)
        box = args.base_image[0]
        if args.distribution:
            target_distribution = args.distribution[0]
        else:
            target_distribution = None
    else:
        target_distribution, box = select_box(runs, gui=args.gui)
    logging.info("Using box %s", box)
    logging.debug("Distribution: %s", target_distribution or "unknown")

    # If using chroot, we might still need to install packages to get missing
    # (not packed) files
    if use_chroot:
        packages = [pkg for pkg in packages if not pkg.packfiles]
        if packages:
            record_usage(vagrant_install_pkgs=True)
            logging.info("Some packages were not packed, so we'll install and "
                         "copy their files\n"
                         "Packages that are missing:\n%s",
                         ' '.join(pkg.name for pkg in packages))

    if packages:
        try:
            installer = select_installer(pack, runs, target_distribution)
        except CantFindInstaller as e:
            logging.error("Need to install %d packages but couldn't select a "
                          "package installer: %s",
                          len(packages), e)

    target.mkdir(parents=True)

    try:
        # Writes setup script
        logging.info("Writing setup script %s...", target / 'setup.sh')
        with (target / 'setup.sh').open('w', encoding='utf-8',
                                        newline='\n') as fp:
            fp.write('#!/bin/sh\n\nset -e\n\n')
            if packages:
                # Updates package sources
                update_script = installer.update_script()
                if update_script:
                    fp.write(update_script)
                fp.write('\n')
                # Installs necessary packages
                fp.write(installer.install_script(packages))
                fp.write('\n')
                # TODO : Compare package versions (painful because of sh)

            # Untar
            if use_chroot:
                fp.write('\n'
                         'mkdir /experimentroot; cd /experimentroot\n')
                fp.write('tar zpxf /vagrant/data.tgz --numeric-owner '
                         '--strip=1 %s\n' % rpz_pack.data_prefix)
                if mount_bind:
                    fp.write('\n'
                             'mkdir -p /experimentroot/dev\n'
                             'mkdir -p /experimentroot/proc\n')

                for pkg in packages:
                    fp.write('\n# Copies files from package %s\n' % pkg.name)
                    for f in pkg.files:
                        f = f.path
                        dest = join_root(PosixPath('/experimentroot'), f)
                        fp.write('mkdir -p %s\n' %
                                 shell_escape(unicode_(f.parent)))
                        fp.write('cp -L %s %s\n' % (
                                 shell_escape(unicode_(f)),
                                 shell_escape(unicode_(dest))))
                fp.write(
                    '\n'
                    'cp /etc/resolv.conf /experimentroot/etc/resolv.conf\n')
            else:
                fp.write('\ncd /\n')
                paths = set()
                pathlist = []
                # Adds intermediate directories, and checks for existence in
                # the tar
                logging.info("Generating file list...")
                data_files = rpz_pack.data_filenames()
                for f in other_files:
                    if f.path.name == 'resolv.conf' and (
                            f.path.lies_under('/etc') or
                            f.path.lies_under('/run') or
                            f.path.lies_under('/var')):
                        continue
                    path = PosixPath('/')
                    for c in rpz_pack.remove_data_prefix(f.path).components:
                        path = path / c
                        if path in paths:
                            continue
                        paths.add(path)
                        if path in data_files:
                            pathlist.append(path)
                        else:
                            logging.info("Missing file %s", path)
                # FIXME : for some reason we need reversed() here, I'm not sure
                # why. Need to read more of tar's docs.
                # TAR bug: --no-overwrite-dir removes --keep-old-files
                # TAR bug: there is no way to make --keep-old-files not report
                # an error if an existing file is encountered. --skip-old-files
                # was introduced too recently. Instead, we just ignore the exit
                # status
                with (target / 'rpz-files.list').open('wb') as lfp:
                    for p in reversed(pathlist):
                        lfp.write(join_root(rpz_pack.data_prefix, p).path)
                        lfp.write(b'\0')
                fp.write('tar zpxf /vagrant/data.tgz --keep-old-files '
                         '--numeric-owner --strip=1 '
                         '--null -T /vagrant/rpz-files.list || /bin/true\n')

            # Copies busybox
            if use_chroot:
                arch = runs[0]['architecture']
                download_file(busybox_url(arch),
                              target / 'busybox',
                              'busybox-%s' % arch)
                fp.write(r'''
cp /vagrant/busybox /experimentroot/busybox
chmod +x /experimentroot/busybox
mkdir -p /experimentroot/bin
[ -e /experimentroot/bin/sh ] || \
    ln -s /busybox /experimentroot/bin/sh
''')

        # Copies pack
        logging.info("Copying pack file...")
        rpz_pack.copy_data_tar(target / 'data.tgz')

        rpz_pack.close()

        # Writes Vagrant file
        logging.info("Writing %s...", target / 'Vagrantfile')
        with (target / 'Vagrantfile').open('w', encoding='utf-8',
                                           newline='\n') as fp:
            # Vagrant header and version
            fp.write(
                '# -*- mode: ruby -*-\n'
                '# vi: set ft=ruby\n\n'
                'VAGRANTFILE_API_VERSION = "2"\n\n'
                'Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|\n')
            # Selects which box to install
            fp.write('  config.vm.box = "%s"\n' % box)
            # Run the setup script on the virtual machine
            fp.write('  config.vm.provision "shell", path: "setup.sh"\n')

            # Memory size
            if memory is not None or args.gui:
                fp.write('  config.vm.provider "virtualbox" do |v|\n')
                if memory is not None:
                    fp.write('    v.memory = %d\n' % memory)
                if args.gui:
                    fp.write('    v.gui = true\n')
                fp.write('  end\n')

            fp.write('end\n')

        # Meta-data for reprounzip
        write_dict(target,
                   metadata_initial_iofiles(config,
                                            {'use_chroot': use_chroot,
                                             'gui': args.gui}))

        signals.post_setup(target=target, pack=pack)
    except Exception:
        target.rmtree(ignore_errors=True)
        raise
Exemple #10
0
def docker_setup_create(args):
    """Sets up the experiment to be run in a Docker-built container.
    """
    pack = Path(args.pack[0])
    target = Path(args.target[0])
    if target.exists():
        logging.critical("Target directory exists")
        sys.exit(1)

    signals.pre_setup(target=target, pack=pack)

    target.mkdir()

    try:
        # Unpacks configuration file
        rpz_pack = RPZPack(pack)
        rpz_pack.extract_config(target / 'config.yml')

        # Loads config
        runs, packages, other_files = config = load_config(
            target / 'config.yml', True)

        if args.base_image:
            record_usage(docker_explicit_base=True)
            base_image = args.base_image[0]
            if args.distribution:
                target_distribution = args.distribution[0]
            else:
                target_distribution = None
        else:
            target_distribution, base_image = select_image(runs)
        logging.info("Using base image %s", base_image)
        logging.debug("Distribution: %s", target_distribution or "unknown")

        rpz_pack.copy_data_tar(target / 'data.tgz')

        arch = runs[0]['architecture']

        # Writes Dockerfile
        logging.info("Writing %s...", target / 'Dockerfile')
        with (target / 'Dockerfile').open('w', encoding='utf-8',
                                          newline='\n') as fp:
            fp.write('FROM %s\n\n' % base_image)

            # Installs busybox
            download_file(busybox_url(arch),
                          target / 'busybox',
                          'busybox-%s' % arch)
            fp.write('COPY busybox /busybox\n')

            # Installs rpzsudo
            download_file(sudo_url(arch),
                          target / 'rpzsudo',
                          'rpzsudo-%s' % arch)
            fp.write('COPY rpzsudo /rpzsudo\n\n')

            fp.write('COPY data.tgz /reprozip_data.tgz\n\n')
            fp.write('COPY rpz-files.list /rpz-files.list\n')
            fp.write('RUN \\\n'
                     '    chmod +x /busybox /rpzsudo && \\\n')

            if args.install_pkgs:
                # Install every package through package manager
                missing_packages = []
            else:
                # Only install packages that were not packed
                missing_packages = [pkg for pkg in packages if pkg.packfiles]
                packages = [pkg for pkg in packages if not pkg.packfiles]
            if packages:
                record_usage(docker_install_pkgs=True)
                try:
                    installer = select_installer(pack, runs,
                                                 target_distribution)
                except CantFindInstaller as e:
                    logging.error("Need to install %d packages but couldn't "
                                  "select a package installer: %s",
                                  len(packages), e)
                    sys.exit(1)
                # Updates package sources
                update_script = installer.update_script()
                if update_script:
                    fp.write('    %s && \\\n' % update_script)
                # Installs necessary packages
                fp.write('    %s && \\\n' % installer.install_script(packages))
                logging.info("Dockerfile will install the %d software "
                             "packages that were not packed", len(packages))
            else:
                record_usage(docker_install_pkgs=False)

            # Untar
            paths = set()
            pathlist = []
            # Add intermediate directories, and check for existence in the tar
            missing_files = chain.from_iterable(pkg.files
                                                for pkg in missing_packages)
            data_files = rpz_pack.data_filenames()
            listoffiles = list(chain(other_files, missing_files))
            for f in listoffiles:
                path = PosixPath('/')
                for c in rpz_pack.remove_data_prefix(f.path).components:
                    path = path / c
                    if path in paths:
                        continue
                    paths.add(path)
                    if path in data_files:
                        pathlist.append(path)
                    else:
                        logging.info("Missing file %s", path)
            rpz_pack.close()
            # FIXME : for some reason we need reversed() here, I'm not sure why
            # Need to read more of tar's docs.
            # TAR bug: --no-overwrite-dir removes --keep-old-files
            with (target / 'rpz-files.list').open('wb') as lfp:
                for p in reversed(pathlist):
                    lfp.write(join_root(rpz_pack.data_prefix, p).path)
                    lfp.write(b'\0')
            fp.write('    cd / && '
                     '(tar zpxf /reprozip_data.tgz -U --recursive-unlink '
                     '--numeric-owner --strip=1 --null -T /rpz-files.list || '
                     '/busybox echo "TAR reports errors, this might or might '
                     'not prevent the execution to run")\n')

        # Meta-data for reprounzip
        write_dict(target, metadata_initial_iofiles(config))

        signals.post_setup(target=target, pack=pack)
    except Exception:
        target.rmtree(ignore_errors=True)
        raise