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#
# 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
from collections import defaultdict
from distutils import spawn
from wic import WicError
logger = logging.getLogger('wic')
# executable -> recipe pairs for exec_native_cmd
NATIVE_RECIPES = {"bmaptool": "bmap-tools",
"grub-mkimage": "grub-efi",
"isohybrid": "syslinux",
"mcopy": "mtools",
"mdel" : "mtools",
"mdeltree" : "mtools",
"mdir" : "mtools",
"mkdosfs": "dosfstools",
"mkisofs": "cdrtools",
"mkfs.btrfs": "btrfs-tools",
"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 spawn.find_executable(cmd, 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
native_paths = "%s/sbin:%s/usr/sbin:%s/usr/bin:%s/bin" % \
(native_sysroot, native_sysroot,
native_sysroot, native_sysroot)
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)
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