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Diffstat (limited to 'scripts/lib/wic/engine.py')
| -rw-r--r-- | scripts/lib/wic/engine.py | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/scripts/lib/wic/engine.py b/scripts/lib/wic/engine.py new file mode 100644 index 0000000000..f59821fea6 --- /dev/null +++ b/scripts/lib/wic/engine.py @@ -0,0 +1,257 @@ +# ex:ts=4:sw=4:sts=4:et +# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- +# +# Copyright (c) 2013, Intel Corporation. +# All rights reserved. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 2 as +# published by the Free Software Foundation. +# +# 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. +# +# DESCRIPTION + +# This module implements the image creation engine used by 'wic' to +# create images. The engine parses through the OpenEmbedded kickstart +# (wks) file specified and generates images that can then be directly +# written onto media. +# +# AUTHORS +# Tom Zanussi <tom.zanussi (at] linux.intel.com> +# + +import logging +import os + +from wic import WicError +from wic.pluginbase import PluginMgr +from wic.utils.misc import get_bitbake_var + +logger = logging.getLogger('wic') + +def verify_build_env(): + """ + Verify that the build environment is sane. + + Returns True if it is, false otherwise + """ + if not os.environ.get("BUILDDIR"): + raise WicError("BUILDDIR not found, exiting. (Did you forget to source oe-init-build-env?)") + + return True + + +CANNED_IMAGE_DIR = "lib/wic/canned-wks" # relative to scripts +SCRIPTS_CANNED_IMAGE_DIR = "scripts/" + CANNED_IMAGE_DIR +WIC_DIR = "wic" + +def build_canned_image_list(path): + layers_path = get_bitbake_var("BBLAYERS") + canned_wks_layer_dirs = [] + + if layers_path is not None: + for layer_path in layers_path.split(): + for wks_path in (WIC_DIR, SCRIPTS_CANNED_IMAGE_DIR): + cpath = os.path.join(layer_path, wks_path) + if os.path.isdir(cpath): + canned_wks_layer_dirs.append(cpath) + + cpath = os.path.join(path, CANNED_IMAGE_DIR) + canned_wks_layer_dirs.append(cpath) + + return canned_wks_layer_dirs + +def find_canned_image(scripts_path, wks_file): + """ + Find a .wks file with the given name in the canned files dir. + + Return False if not found + """ + layers_canned_wks_dir = build_canned_image_list(scripts_path) + + for canned_wks_dir in layers_canned_wks_dir: + for root, dirs, files in os.walk(canned_wks_dir): + for fname in files: + if fname.endswith("~") or fname.endswith("#"): + continue + if fname.endswith(".wks") and wks_file + ".wks" == fname: + fullpath = os.path.join(canned_wks_dir, fname) + return fullpath + return None + + +def list_canned_images(scripts_path): + """ + List the .wks files in the canned image dir, minus the extension. + """ + layers_canned_wks_dir = build_canned_image_list(scripts_path) + + for canned_wks_dir in layers_canned_wks_dir: + for root, dirs, files in os.walk(canned_wks_dir): + for fname in files: + if fname.endswith("~") or fname.endswith("#"): + continue + if fname.endswith(".wks"): + fullpath = os.path.join(canned_wks_dir, fname) + with open(fullpath) as wks: + for line in wks: + desc = "" + idx = line.find("short-description:") + if idx != -1: + desc = line[idx + len("short-description:"):].strip() + break + basename = os.path.splitext(fname)[0] + print(" %s\t\t%s" % (basename.ljust(30), desc)) + + +def list_canned_image_help(scripts_path, fullpath): + """ + List the help and params in the specified canned image. + """ + found = False + with open(fullpath) as wks: + for line in wks: + if not found: + idx = line.find("long-description:") + if idx != -1: + print() + print(line[idx + len("long-description:"):].strip()) + found = True + continue + if not line.strip(): + break + idx = line.find("#") + if idx != -1: + print(line[idx + len("#:"):].rstrip()) + else: + break + + +def list_source_plugins(): + """ + List the available source plugins i.e. plugins available for --source. + """ + plugins = PluginMgr.get_plugins('source') + + for plugin in plugins: + print(" %s" % plugin) + + +def wic_create(wks_file, rootfs_dir, bootimg_dir, kernel_dir, + native_sysroot, options): + """ + Create image + + wks_file - user-defined OE kickstart file + rootfs_dir - absolute path to the build's /rootfs dir + bootimg_dir - absolute path to the build's boot artifacts directory + kernel_dir - absolute path to the build's kernel directory + native_sysroot - absolute path to the build's native sysroots dir + image_output_dir - dirname to create for image + options - wic command line options (debug, bmap, etc) + + Normally, the values for the build artifacts values are determined + by 'wic -e' from the output of the 'bitbake -e' command given an + image name e.g. 'core-image-minimal' and a given machine set in + local.conf. If that's the case, the variables get the following + values from the output of 'bitbake -e': + + rootfs_dir: IMAGE_ROOTFS + kernel_dir: DEPLOY_DIR_IMAGE + native_sysroot: STAGING_DIR_NATIVE + + In the above case, bootimg_dir remains unset and the + plugin-specific image creation code is responsible for finding the + bootimg artifacts. + + In the case where the values are passed in explicitly i.e 'wic -e' + is not used but rather the individual 'wic' options are used to + explicitly specify these values. + """ + try: + oe_builddir = os.environ["BUILDDIR"] + except KeyError: + raise WicError("BUILDDIR not found, exiting. (Did you forget to source oe-init-build-env?)") + + if not os.path.exists(options.outdir): + os.makedirs(options.outdir) + + pname = 'direct' + plugin_class = PluginMgr.get_plugins('imager').get(pname) + if not plugin_class: + raise WicError('Unknown plugin: %s' % pname) + + plugin = plugin_class(wks_file, rootfs_dir, bootimg_dir, kernel_dir, + native_sysroot, oe_builddir, options) + + plugin.do_create() + + logger.info("The image(s) were created using OE kickstart file:\n %s", wks_file) + + +def wic_list(args, scripts_path): + """ + Print the list of images or source plugins. + """ + if len(args) < 1: + return False + + if args == ["images"]: + list_canned_images(scripts_path) + return True + elif args == ["source-plugins"]: + list_source_plugins() + return True + elif len(args) == 2 and args[1] == "help": + wks_file = args[0] + fullpath = find_canned_image(scripts_path, wks_file) + if not fullpath: + raise WicError("No image named %s found, exiting. " + "(Use 'wic list images' to list available images, " + "or specify a fully-qualified OE kickstart (.wks) " + "filename)" % wks_file) + + list_canned_image_help(scripts_path, fullpath) + return True + + return False + +def find_canned(scripts_path, file_name): + """ + Find a file either by its path or by name in the canned files dir. + + Return None if not found + """ + if os.path.exists(file_name): + return file_name + + layers_canned_wks_dir = build_canned_image_list(scripts_path) + for canned_wks_dir in layers_canned_wks_dir: + for root, dirs, files in os.walk(canned_wks_dir): + for fname in files: + if fname == file_name: + fullpath = os.path.join(canned_wks_dir, fname) + return fullpath + +def get_custom_config(boot_file): + """ + Get the custom configuration to be used for the bootloader. + + Return None if the file can't be found. + """ + # Get the scripts path of poky + scripts_path = os.path.abspath("%s/../.." % os.path.dirname(__file__)) + + cfg_file = find_canned(scripts_path, boot_file) + if cfg_file: + with open(cfg_file, "r") as f: + config = f.read() + return config |