264 lines
8.4 KiB
Python
264 lines
8.4 KiB
Python
# ex:ts=4:sw=4:sts=4:et
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# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
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#
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# Copyright (c) 2013, Intel Corporation.
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# All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# DESCRIPTION
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# This module provides a place to collect various wic-related utils
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# for the OpenEmbedded Image Tools.
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#
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# AUTHORS
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# Tom Zanussi <tom.zanussi (at] linux.intel.com>
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#
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"""Miscellaneous functions."""
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import logging
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import os
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import re
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import subprocess
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from collections import defaultdict
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from distutils import spawn
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from wic import WicError
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logger = logging.getLogger('wic')
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# executable -> recipe pairs for exec_native_cmd
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NATIVE_RECIPES = {"bmaptool": "bmap-tools",
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"grub-mkimage": "grub-efi",
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"isohybrid": "syslinux",
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"mcopy": "mtools",
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"mdel" : "mtools",
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"mdeltree" : "mtools",
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"mdir" : "mtools",
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"mkdosfs": "dosfstools",
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"mkisofs": "cdrtools",
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"mkfs.btrfs": "btrfs-tools",
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"mkfs.ext2": "e2fsprogs",
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"mkfs.ext3": "e2fsprogs",
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"mkfs.ext4": "e2fsprogs",
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"mkfs.vfat": "dosfstools",
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"mksquashfs": "squashfs-tools",
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"mkswap": "util-linux",
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"mmd": "mtools",
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"parted": "parted",
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"sfdisk": "util-linux",
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"sgdisk": "gptfdisk",
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"syslinux": "syslinux"
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}
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def runtool(cmdln_or_args):
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""" wrapper for most of the subprocess calls
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input:
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cmdln_or_args: can be both args and cmdln str (shell=True)
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return:
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rc, output
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"""
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if isinstance(cmdln_or_args, list):
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cmd = cmdln_or_args[0]
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shell = False
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else:
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import shlex
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cmd = shlex.split(cmdln_or_args)[0]
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shell = True
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sout = subprocess.PIPE
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serr = subprocess.STDOUT
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try:
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process = subprocess.Popen(cmdln_or_args, stdout=sout,
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stderr=serr, shell=shell)
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sout, serr = process.communicate()
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# combine stdout and stderr, filter None out and decode
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out = ''.join([out.decode('utf-8') for out in [sout, serr] if out])
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except OSError as err:
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if err.errno == 2:
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# [Errno 2] No such file or directory
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raise WicError('Cannot run command: %s, lost dependency?' % cmd)
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else:
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raise # relay
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return process.returncode, out
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def _exec_cmd(cmd_and_args, as_shell=False):
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"""
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Execute command, catching stderr, stdout
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Need to execute as_shell if the command uses wildcards
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"""
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logger.debug("_exec_cmd: %s", cmd_and_args)
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args = cmd_and_args.split()
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logger.debug(args)
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if as_shell:
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ret, out = runtool(cmd_and_args)
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else:
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ret, out = runtool(args)
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out = out.strip()
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if ret != 0:
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raise WicError("_exec_cmd: %s returned '%s' instead of 0\noutput: %s" % \
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(cmd_and_args, ret, out))
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logger.debug("_exec_cmd: output for %s (rc = %d): %s",
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cmd_and_args, ret, out)
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return ret, out
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def exec_cmd(cmd_and_args, as_shell=False):
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"""
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Execute command, return output
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"""
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return _exec_cmd(cmd_and_args, as_shell)[1]
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def exec_native_cmd(cmd_and_args, native_sysroot, pseudo=""):
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"""
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Execute native command, catching stderr, stdout
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Need to execute as_shell if the command uses wildcards
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Always need to execute native commands as_shell
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"""
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# The reason -1 is used is because there may be "export" commands.
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args = cmd_and_args.split(';')[-1].split()
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logger.debug(args)
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if pseudo:
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cmd_and_args = pseudo + cmd_and_args
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native_paths = "%s/sbin:%s/usr/sbin:%s/usr/bin" % \
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(native_sysroot, native_sysroot, native_sysroot)
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native_cmd_and_args = "export PATH=%s:$PATH;%s" % \
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(native_paths, cmd_and_args)
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logger.debug("exec_native_cmd: %s", native_cmd_and_args)
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# If the command isn't in the native sysroot say we failed.
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if spawn.find_executable(args[0], native_paths):
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ret, out = _exec_cmd(native_cmd_and_args, True)
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else:
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ret = 127
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out = "can't find native executable %s in %s" % (args[0], native_paths)
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prog = args[0]
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# shell command-not-found
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if ret == 127 \
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or (pseudo and ret == 1 and out == "Can't find '%s' in $PATH." % prog):
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msg = "A native program %s required to build the image "\
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"was not found (see details above).\n\n" % prog
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recipe = NATIVE_RECIPES.get(prog)
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if recipe:
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msg += "Please make sure wic-tools have %s-native in its DEPENDS, "\
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"build it with 'bitbake wic-tools' and try again.\n" % recipe
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else:
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msg += "Wic failed to find a recipe to build native %s. Please "\
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"file a bug against wic.\n" % prog
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raise WicError(msg)
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return ret, out
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BOOTDD_EXTRA_SPACE = 16384
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class BitbakeVars(defaultdict):
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"""
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Container for Bitbake variables.
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"""
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def __init__(self):
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defaultdict.__init__(self, dict)
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# default_image and vars_dir attributes should be set from outside
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self.default_image = None
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self.vars_dir = None
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def _parse_line(self, line, image, matcher=re.compile(r"^([a-zA-Z0-9\-_+./~]+)=(.*)")):
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"""
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Parse one line from bitbake -e output or from .env file.
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Put result key-value pair into the storage.
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"""
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if "=" not in line:
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return
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match = matcher.match(line)
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if not match:
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return
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key, val = match.groups()
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self[image][key] = val.strip('"')
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def get_var(self, var, image=None, cache=True):
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"""
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Get bitbake variable from 'bitbake -e' output or from .env file.
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This is a lazy method, i.e. it runs bitbake or parses file only when
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only when variable is requested. It also caches results.
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"""
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if not image:
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image = self.default_image
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if image not in self:
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if image and self.vars_dir:
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fname = os.path.join(self.vars_dir, image + '.env')
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if os.path.isfile(fname):
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# parse .env file
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with open(fname) as varsfile:
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for line in varsfile:
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self._parse_line(line, image)
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else:
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print("Couldn't get bitbake variable from %s." % fname)
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print("File %s doesn't exist." % fname)
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return
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else:
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# Get bitbake -e output
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cmd = "bitbake -e"
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if image:
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cmd += " %s" % image
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log_level = logger.getEffectiveLevel()
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logger.setLevel(logging.INFO)
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ret, lines = _exec_cmd(cmd)
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logger.setLevel(log_level)
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if ret:
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logger.error("Couldn't get '%s' output.", cmd)
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logger.error("Bitbake failed with error:\n%s\n", lines)
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return
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# Parse bitbake -e output
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for line in lines.split('\n'):
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self._parse_line(line, image)
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# Make first image a default set of variables
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if cache:
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images = [key for key in self if key]
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if len(images) == 1:
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self[None] = self[image]
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result = self[image].get(var)
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if not cache:
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self.pop(image, None)
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return result
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# Create BB_VARS singleton
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BB_VARS = BitbakeVars()
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def get_bitbake_var(var, image=None, cache=True):
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"""
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Provide old get_bitbake_var API by wrapping
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get_var method of BB_VARS singleton.
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"""
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return BB_VARS.get_var(var, image, cache)
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