from oe.utils import execute_pre_post_process import os import subprocess import multiprocessing def generate_image(arg): (type, subimages, create_img_cmd) = arg bb.note("Running image creation script for %s: %s ..." % (type, create_img_cmd)) try: output = subprocess.check_output(create_img_cmd, stderr=subprocess.STDOUT) except subprocess.CalledProcessError as e: return("Error: The image creation script '%s' returned %d:\n%s" % (e.cmd, e.returncode, e.output)) bb.note("Script output:\n%s" % output) return None """ This class will help compute IMAGE_FSTYPE dependencies and group them in batches that can be executed in parallel. The next example is for illustration purposes, highly unlikely to happen in real life. It's just one of the test cases I used to test the algorithm: For: IMAGE_FSTYPES = "i1 i2 i3 i4 i5" IMAGE_TYPEDEP_i4 = "i2" IMAGE_TYPEDEP_i5 = "i6 i4" IMAGE_TYPEDEP_i6 = "i7" IMAGE_TYPEDEP_i7 = "i2" We get the following list of batches that can be executed in parallel, having the dependencies satisfied: [['i1', 'i3', 'i2'], ['i4', 'i7'], ['i6'], ['i5']] """ class ImageDepGraph(object): def __init__(self, d): self.d = d self.graph = dict() self.deps_array = dict() def _construct_dep_graph(self, image_fstypes): graph = dict() def add_node(node): base_type = self._image_base_type(node) deps = (self.d.getVar('IMAGE_TYPEDEP_' + node, True) or "") base_deps = (self.d.getVar('IMAGE_TYPEDEP_' + base_type, True) or "") if deps != "" or base_deps != "": graph[node] = deps for dep in deps.split() + base_deps.split(): if not dep in graph: add_node(dep) else: graph[node] = "" for fstype in image_fstypes: add_node(fstype) return graph def _clean_graph(self): # Live and VMDK/VDI images will be processed via inheriting # bbclass and does not get processed here. Remove them from the fstypes # graph. Their dependencies are already added, so no worries here. remove_list = (self.d.getVar('IMAGE_TYPES_MASKED', True) or "").split() for item in remove_list: self.graph.pop(item, None) def _image_base_type(self, type): ctypes = self.d.getVar('COMPRESSIONTYPES', True).split() if type in ["vmdk", "vdi", "qcow2", "live", "iso", "hddimg"]: type = "ext4" basetype = type for ctype in ctypes: if type.endswith("." + ctype): basetype = type[:-len("." + ctype)] break return basetype def _compute_dependencies(self): """ returns dict object of nodes with [no_of_depends_on, no_of_depended_by] for each node """ deps_array = dict() for node in self.graph: deps_array[node] = [0, 0] for node in self.graph: deps = self.graph[node].split() deps_array[node][0] += len(deps) for dep in deps: deps_array[dep][1] += 1 return deps_array def _sort_graph(self): sorted_list = [] group = [] for node in self.graph: if node not in self.deps_array: continue depends_on = self.deps_array[node][0] if depends_on == 0: group.append(node) if len(group) == 0 and len(self.deps_array) != 0: bb.fatal("possible fstype circular dependency...") sorted_list.append(group) # remove added nodes from deps_array for item in group: for node in self.graph: if item in self.graph[node].split(): self.deps_array[node][0] -= 1 self.deps_array.pop(item, None) if len(self.deps_array): # recursive call, to find the next group sorted_list += self._sort_graph() return sorted_list def group_fstypes(self, image_fstypes): self.graph = self._construct_dep_graph(image_fstypes) self._clean_graph() self.deps_array = self._compute_dependencies() alltypes = [node for node in self.graph] return (alltypes, self._sort_graph()) class Image(ImageDepGraph): def __init__(self, d): self.d = d super(Image, self).__init__(d) def _get_rootfs_size(self): """compute the rootfs size""" rootfs_alignment = int(self.d.getVar('IMAGE_ROOTFS_ALIGNMENT', True)) overhead_factor = float(self.d.getVar('IMAGE_OVERHEAD_FACTOR', True)) rootfs_req_size = int(self.d.getVar('IMAGE_ROOTFS_SIZE', True)) rootfs_extra_space = eval(self.d.getVar('IMAGE_ROOTFS_EXTRA_SPACE', True)) rootfs_maxsize = self.d.getVar('IMAGE_ROOTFS_MAXSIZE', True) output = subprocess.check_output(['du', '-ks', self.d.getVar('IMAGE_ROOTFS', True)]) size_kb = int(output.split()[0]) base_size = size_kb * overhead_factor base_size = (base_size, rootfs_req_size)[base_size < rootfs_req_size] + \ rootfs_extra_space if base_size != int(base_size): base_size = int(base_size + 1) else: base_size = int(base_size) base_size += rootfs_alignment - 1 base_size -= base_size % rootfs_alignment # Check the rootfs size against IMAGE_ROOTFS_MAXSIZE (if set) if rootfs_maxsize: rootfs_maxsize_int = int(rootfs_maxsize) if base_size > rootfs_maxsize_int: bb.fatal("The rootfs size %d(K) overrides the max size %d(K)" % \ (base_size, rootfs_maxsize_int)) return base_size def _create_symlinks(self, subimages): """create symlinks to the newly created image""" deploy_dir = self.d.getVar('DEPLOY_DIR_IMAGE', True) img_name = self.d.getVar('IMAGE_NAME', True) link_name = self.d.getVar('IMAGE_LINK_NAME', True) manifest_name = self.d.getVar('IMAGE_MANIFEST', True) os.chdir(deploy_dir) if link_name: for type in subimages: if os.path.exists(img_name + ".rootfs." + type): dst = link_name + "." + type src = img_name + ".rootfs." + type bb.note("Creating symlink: %s -> %s" % (dst, src)) os.symlink(src, dst) if manifest_name is not None and \ os.path.exists(manifest_name) and \ not os.path.exists(link_name + ".manifest"): os.symlink(os.path.basename(manifest_name), link_name + ".manifest") def _remove_old_symlinks(self): """remove the symlinks to old binaries""" if self.d.getVar('IMAGE_LINK_NAME', True): deploy_dir = self.d.getVar('DEPLOY_DIR_IMAGE', True) for img in os.listdir(deploy_dir): if img.find(self.d.getVar('IMAGE_LINK_NAME', True)) == 0: img = os.path.join(deploy_dir, img) if os.path.islink(img): if self.d.getVar('RM_OLD_IMAGE', True) == "1" and \ os.path.exists(os.path.realpath(img)): os.remove(os.path.realpath(img)) os.remove(img) """ This function will just filter out the compressed image types from the fstype groups returning a (filtered_fstype_groups, cimages) tuple. """ def _filter_out_commpressed(self, fstype_groups): ctypes = self.d.getVar('COMPRESSIONTYPES', True).split() cimages = {} filtered_groups = [] for group in fstype_groups: filtered_group = [] for type in group: basetype = None for ctype in ctypes: if type.endswith("." + ctype): basetype = type[:-len("." + ctype)] if basetype not in filtered_group: filtered_group.append(basetype) if basetype not in cimages: cimages[basetype] = [] if ctype not in cimages[basetype]: cimages[basetype].append(ctype) break if not basetype and type not in filtered_group: filtered_group.append(type) filtered_groups.append(filtered_group) return (filtered_groups, cimages) def _get_image_types(self): """returns a (types, cimages) tuple""" alltypes, fstype_groups = self.group_fstypes(self.d.getVar('IMAGE_FSTYPES', True).split()) filtered_groups, cimages = self._filter_out_commpressed(fstype_groups) return (alltypes, filtered_groups, cimages) def _write_script(self, type, cmds): tempdir = self.d.getVar('T', True) script_name = os.path.join(tempdir, "create_image." + type) rootfs_size = self._get_rootfs_size() self.d.setVar('img_creation_func', '\n'.join(cmds)) self.d.setVarFlag('img_creation_func', 'func', 1) self.d.setVarFlag('img_creation_func', 'fakeroot', 1) self.d.setVar('ROOTFS_SIZE', str(rootfs_size)) with open(script_name, "w+") as script: script.write("%s" % bb.build.shell_trap_code()) script.write("export ROOTFS_SIZE=%d\n" % rootfs_size) bb.data.emit_func('img_creation_func', script, self.d) script.write("img_creation_func\n") os.chmod(script_name, 0775) return script_name def _get_imagecmds(self): old_overrides = self.d.getVar('OVERRIDES', 0) alltypes, fstype_groups, cimages = self._get_image_types() image_cmd_groups = [] bb.note("The image creation groups are: %s" % str(fstype_groups)) for fstype_group in fstype_groups: image_cmds = [] for type in fstype_group: cmds = [] subimages = [] localdata = bb.data.createCopy(self.d) localdata.setVar('OVERRIDES', '%s:%s' % (type, old_overrides)) bb.data.update_data(localdata) localdata.setVar('type', type) image_cmd = localdata.getVar("IMAGE_CMD", True) if image_cmd: cmds.append("\t" + image_cmd) else: bb.fatal("No IMAGE_CMD defined for IMAGE_FSTYPES entry '%s' - possibly invalid type name or missing support class" % type) cmds.append(localdata.expand("\tcd ${DEPLOY_DIR_IMAGE}")) if type in cimages: for ctype in cimages[type]: cmds.append("\t" + localdata.getVar("COMPRESS_CMD_" + ctype, True)) subimages.append(type + "." + ctype) if type not in alltypes: cmds.append(localdata.expand("\trm ${IMAGE_NAME}.rootfs.${type}")) else: subimages.append(type) script_name = self._write_script(type, cmds) image_cmds.append((type, subimages, script_name)) image_cmd_groups.append(image_cmds) return image_cmd_groups def _write_wic_env(self): """ Write environment variables used by wic to tmp/sysroots//imgdata/.env """ stdir = self.d.getVar('STAGING_DIR_TARGET', True) outdir = os.path.join(stdir, 'imgdata') if not os.path.exists(outdir): os.makedirs(outdir) basename = self.d.getVar('IMAGE_BASENAME', True) with open(os.path.join(outdir, basename) + '.env', 'w') as envf: for var in self.d.getVar('WICVARS', True).split(): value = self.d.getVar(var, True) if value: envf.write('%s="%s"\n' % (var, value.strip())) def create(self): bb.note("###### Generate images #######") pre_process_cmds = self.d.getVar("IMAGE_PREPROCESS_COMMAND", True) post_process_cmds = self.d.getVar("IMAGE_POSTPROCESS_COMMAND", True) execute_pre_post_process(self.d, pre_process_cmds) self._remove_old_symlinks() image_cmd_groups = self._get_imagecmds() self._write_wic_env() for image_cmds in image_cmd_groups: # create the images in parallel nproc = multiprocessing.cpu_count() pool = bb.utils.multiprocessingpool(nproc) results = list(pool.imap(generate_image, image_cmds)) pool.close() pool.join() for result in results: if result is not None: bb.fatal(result) for image_type, subimages, script in image_cmds: bb.note("Creating symlinks for %s image ..." % image_type) self._create_symlinks(subimages) execute_pre_post_process(self.d, post_process_cmds) def create_image(d): Image(d).create() if __name__ == "__main__": """ Image creation can be called independent from bitbake environment. """ """ TBD """