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Diffstat (limited to 'scripts/lib/wic/misc.py')
| -rw-r--r-- | scripts/lib/wic/misc.py | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/scripts/lib/wic/misc.py b/scripts/lib/wic/misc.py new file mode 100644 index 0000000000..2b90821b30 --- /dev/null +++ b/scripts/lib/wic/misc.py @@ -0,0 +1,266 @@ +# +# Copyright (c) 2013, Intel Corporation. +# +# SPDX-License-Identifier: GPL-2.0-only +# +# DESCRIPTION +# This module provides a place to collect various wic-related utils +# for the OpenEmbedded Image Tools. +# +# AUTHORS +# Tom Zanussi <tom.zanussi (at] linux.intel.com> +# +"""Miscellaneous functions.""" + +import logging +import os +import re +import subprocess +import shutil + +from collections import defaultdict + +from wic import WicError + +logger = logging.getLogger('wic') + +# executable -> recipe pairs for exec_native_cmd +NATIVE_RECIPES = {"bmaptool": "bmap-tools", + "dumpe2fs": "e2fsprogs", + "grub-mkimage": "grub-efi", + "isohybrid": "syslinux", + "mcopy": "mtools", + "mdel" : "mtools", + "mdeltree" : "mtools", + "mdir" : "mtools", + "mkdosfs": "dosfstools", + "mkisofs": "cdrtools", + "mkfs.btrfs": "btrfs-tools", + "mkfs.erofs": "erofs-utils", + "mkfs.ext2": "e2fsprogs", + "mkfs.ext3": "e2fsprogs", + "mkfs.ext4": "e2fsprogs", + "mkfs.vfat": "dosfstools", + "mksquashfs": "squashfs-tools", + "mkswap": "util-linux", + "mmd": "mtools", + "parted": "parted", + "sfdisk": "util-linux", + "sgdisk": "gptfdisk", + "syslinux": "syslinux", + "tar": "tar" + } + +def runtool(cmdln_or_args): + """ wrapper for most of the subprocess calls + input: + cmdln_or_args: can be both args and cmdln str (shell=True) + return: + rc, output + """ + if isinstance(cmdln_or_args, list): + cmd = cmdln_or_args[0] + shell = False + else: + import shlex + cmd = shlex.split(cmdln_or_args)[0] + shell = True + + sout = subprocess.PIPE + serr = subprocess.STDOUT + + try: + process = subprocess.Popen(cmdln_or_args, stdout=sout, + stderr=serr, shell=shell) + sout, serr = process.communicate() + # combine stdout and stderr, filter None out and decode + out = ''.join([out.decode('utf-8') for out in [sout, serr] if out]) + except OSError as err: + if err.errno == 2: + # [Errno 2] No such file or directory + raise WicError('Cannot run command: %s, lost dependency?' % cmd) + else: + raise # relay + + return process.returncode, out + +def _exec_cmd(cmd_and_args, as_shell=False): + """ + Execute command, catching stderr, stdout + + Need to execute as_shell if the command uses wildcards + """ + logger.debug("_exec_cmd: %s", cmd_and_args) + args = cmd_and_args.split() + logger.debug(args) + + if as_shell: + ret, out = runtool(cmd_and_args) + else: + ret, out = runtool(args) + out = out.strip() + if ret != 0: + raise WicError("_exec_cmd: %s returned '%s' instead of 0\noutput: %s" % \ + (cmd_and_args, ret, out)) + + logger.debug("_exec_cmd: output for %s (rc = %d): %s", + cmd_and_args, ret, out) + + return ret, out + + +def exec_cmd(cmd_and_args, as_shell=False): + """ + Execute command, return output + """ + return _exec_cmd(cmd_and_args, as_shell)[1] + +def find_executable(cmd, paths): + recipe = cmd + if recipe in NATIVE_RECIPES: + recipe = NATIVE_RECIPES[recipe] + provided = get_bitbake_var("ASSUME_PROVIDED") + if provided and "%s-native" % recipe in provided: + return True + + return shutil.which(cmd, path=paths) + +def exec_native_cmd(cmd_and_args, native_sysroot, pseudo=""): + """ + Execute native command, catching stderr, stdout + + Need to execute as_shell if the command uses wildcards + + Always need to execute native commands as_shell + """ + # The reason -1 is used is because there may be "export" commands. + args = cmd_and_args.split(';')[-1].split() + logger.debug(args) + + if pseudo: + cmd_and_args = pseudo + cmd_and_args + + hosttools_dir = get_bitbake_var("HOSTTOOLS_DIR") + target_sys = get_bitbake_var("TARGET_SYS") + + native_paths = "%s/sbin:%s/usr/sbin:%s/usr/bin:%s/usr/bin/%s:%s/bin:%s" % \ + (native_sysroot, native_sysroot, + native_sysroot, native_sysroot, target_sys, + native_sysroot, hosttools_dir) + + native_cmd_and_args = "export PATH=%s:$PATH;%s" % \ + (native_paths, cmd_and_args) + logger.debug("exec_native_cmd: %s", native_cmd_and_args) + + # If the command isn't in the native sysroot say we failed. + if find_executable(args[0], native_paths): + ret, out = _exec_cmd(native_cmd_and_args, True) + else: + ret = 127 + out = "can't find native executable %s in %s" % (args[0], native_paths) + + prog = args[0] + # shell command-not-found + if ret == 127 \ + or (pseudo and ret == 1 and out == "Can't find '%s' in $PATH." % prog): + msg = "A native program %s required to build the image "\ + "was not found (see details above).\n\n" % prog + recipe = NATIVE_RECIPES.get(prog) + if recipe: + msg += "Please make sure wic-tools have %s-native in its DEPENDS, "\ + "build it with 'bitbake wic-tools' and try again.\n" % recipe + else: + msg += "Wic failed to find a recipe to build native %s. Please "\ + "file a bug against wic.\n" % prog + raise WicError(msg) + + return ret, out + +BOOTDD_EXTRA_SPACE = 16384 + +class BitbakeVars(defaultdict): + """ + Container for Bitbake variables. + """ + def __init__(self): + defaultdict.__init__(self, dict) + + # default_image and vars_dir attributes should be set from outside + self.default_image = None + self.vars_dir = None + + def _parse_line(self, line, image, matcher=re.compile(r"^([a-zA-Z0-9\-_+./~]+)=(.*)")): + """ + Parse one line from bitbake -e output or from .env file. + Put result key-value pair into the storage. + """ + if "=" not in line: + return + match = matcher.match(line) + if not match: + return + key, val = match.groups() + self[image][key] = val.strip('"') + + def get_var(self, var, image=None, cache=True): + """ + Get bitbake variable from 'bitbake -e' output or from .env file. + This is a lazy method, i.e. it runs bitbake or parses file only when + only when variable is requested. It also caches results. + """ + if not image: + image = self.default_image + + if image not in self: + if image and self.vars_dir: + fname = os.path.join(self.vars_dir, image + '.env') + if os.path.isfile(fname): + # parse .env file + with open(fname) as varsfile: + for line in varsfile: + self._parse_line(line, image) + else: + print("Couldn't get bitbake variable from %s." % fname) + print("File %s doesn't exist." % fname) + return + else: + # Get bitbake -e output + cmd = "bitbake -e" + if image: + cmd += " %s" % image + + log_level = logger.getEffectiveLevel() + logger.setLevel(logging.INFO) + ret, lines = _exec_cmd(cmd) + logger.setLevel(log_level) + + if ret: + logger.error("Couldn't get '%s' output.", cmd) + logger.error("Bitbake failed with error:\n%s\n", lines) + return + + # Parse bitbake -e output + for line in lines.split('\n'): + self._parse_line(line, image) + + # Make first image a default set of variables + if cache: + images = [key for key in self if key] + if len(images) == 1: + self[None] = self[image] + + result = self[image].get(var) + if not cache: + self.pop(image, None) + + return result + +# Create BB_VARS singleton +BB_VARS = BitbakeVars() + +def get_bitbake_var(var, image=None, cache=True): + """ + Provide old get_bitbake_var API by wrapping + get_var method of BB_VARS singleton. + """ + return BB_VARS.get_var(var, image, cache) |