9dc8f26687
Migrate kernel-switcher to a separate directory and start splitting the code into library <-> application.
283 lines
9.1 KiB
Python
283 lines
9.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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@author: Fabio Erculiani <lxnay@sabayon.org>
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@contact: lxnay@sabayon.org
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@copyright: Fabio Erculiani
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@license: GPL-2
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B{System Kernel Switch Utility Library for Sabayon}.
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"""
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import os
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import subprocess
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import errno
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import codecs
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from entropy.const import etpConst, const_convert_to_unicode, \
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const_convert_to_rawstring
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from entropy.exceptions import DependenciesNotRemovable
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from entropy.i18n import _
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from entropy.output import teal, purple, darkgreen, brown, print_info, \
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red, print_warning, print_error
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import entropy.dep
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import entropy.tools
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from solo.commands.install import SoloInstall
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KERNEL_BINARY_VIRTUAL = const_convert_to_unicode("virtual/linux-binary")
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KERNELS_DIR = const_convert_to_rawstring("/etc/kernels")
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RELEASE_LEVEL = const_convert_to_rawstring("RELEASE_LEVEL")
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def _get_kernels(entropy_client):
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matches, x_rc = entropy_client.atom_match(KERNEL_BINARY_VIRTUAL,
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multi_match = True, multi_repo = True)
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return matches, x_rc
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def _remove_tag_from_slot(slot):
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if not hasattr(entropy.dep, "remove_tag_from_slot"):
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# backward compatibility
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return slot[::-1].split(",", 1)[-1][::-1]
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return entropy.dep.remove_tag_from_slot(slot)
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def _get_target_tag(entropy_client, kernel_match):
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try:
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matches = entropy_client.get_reverse_queue([kernel_match],
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recursive = False)
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except DependenciesNotRemovable:
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# wtf should not happen
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raise
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tags = set()
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for pkg_id, pkg_repo in matches:
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tag = entropy_client.open_repository(pkg_repo).retrieveTag(pkg_id)
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if tag:
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tags.add(tag)
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if tags:
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tags = sorted(tags, reverse = True)
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return tags.pop(0)
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def _setup_kernel_symlink(target_tag):
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eselect_exec = "/usr/bin/eselect"
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if os.access(eselect_exec, os.X_OK):
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subprocess.call((eselect_exec, "kernel", "set", target_tag))
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def _guess_kernel_name(kernel_atom):
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"""
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This method takes advantage of Entropy kernel package info files available
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at /etc/kernels/<pkg-name>-<pkg-ver>/ directory.
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This function tries to read uname -r from the RELEASE_LEVEL file.
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"""
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namever = entropy.dep.remove_cat(kernel_atom)
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kernel_meta_file = os.path.join(KERNELS_DIR, namever, RELEASE_LEVEL)
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if os.path.isfile(kernel_meta_file):
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try:
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with open(kernel_meta_file, "r") as km_f:
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kernel_name = km_f.readline().strip()
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if kernel_name:
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return kernel_name
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except (OSError, IOError):
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return None
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def _guess_kernel_package_file(release_level):
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"""
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This method takes advantage of Entropy kernel package info files available
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at /etc/kernels/<pkg-name>-<pkg-ver>/ directory looking for
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a RELEASE_LEVEL file whose content matches release_level (uname -r).
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"""
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if not os.path.isdir(KERNELS_DIR):
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return None
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subs = []
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for _curdir, subs, _files in os.walk(KERNELS_DIR):
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subs.extend(subs)
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for sub in subs:
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sub_path = os.path.join(KERNELS_DIR, sub)
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try:
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dir_list = os.listdir(sub_path)
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except OSError as err:
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if err.errno != errno.ENOENT:
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raise
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continue
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if RELEASE_LEVEL not in dir_list:
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continue
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level_path = os.path.join(
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sub_path, RELEASE_LEVEL)
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with codecs.open(
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level_path, "r", etpConst["conf_raw_encoding"]) as rel_f:
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rel_line = rel_f.readline().strip()
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if release_level == rel_line:
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return const_convert_to_unicode(level_path)
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def _get_opengl_impl(pretend):
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eselect_exec = "/usr/bin/eselect"
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sts = 1
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out = "xorg-x11"
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if os.access(eselect_exec, os.X_OK) and not pretend:
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sts, xout = entropy.tools.getstatusoutput("%s opengl show" % (
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eselect_exec,))
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if sts == 0:
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out = xout
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return out
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def _set_opengl_impl(opengl):
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eselect_exec = "/usr/bin/eselect"
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if os.access(eselect_exec, os.X_OK):
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args = (eselect_exec, "opengl", "set", opengl)
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subprocess.call(args)
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def _show_kernel_warnings(kernel_atom):
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print_info("%s %s" % (purple(kernel_atom), teal(_("has been installed."))))
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print_warning("%s: %s" % (red(_("Attention")),
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brown(_("some external drivers cannot work across multiple kernels."))))
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print_warning(darkgreen(_("Please reboot your computer now !")))
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def switch_kernel(entropy_client, kernel_package, from_running=False,
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pretend=False, ask=False, verbose=False, quiet=False):
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"""
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Execute a kernel switch to the given kernel package.
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Caller is expected to acquire any relevant Entropy lock before
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calling this function.
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@param entropy_client: an Entropy Client object instance
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@type entropy_client: entropy.client.interfaces.Client
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@param kernel_package: a kernel package dependency string
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@type kernel_package: string
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@keyword from_running: if True, determine the current kernel from the
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running system
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@type from_running: bool
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@keyword pretend: if True, show what would be done
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@type pretend: bool
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@keyword ask: if True, ask interactively
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@type ask: bool
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@keyword verbose: if True, be more verbose
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@type verbose: bool
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@keyword quiet: if True, be more quiet
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@type quiet: bool
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"""
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pkg_id, pkg_repo = entropy_client.atom_match(kernel_package)
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if pkg_id == -1:
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print_error("%s: %s" % (brown(_("Package does not exist")),
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teal(kernel_package),))
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return 1
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kernel_matches, rc = _get_kernels(entropy_client)
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kernel_match = (pkg_id, pkg_repo)
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if kernel_match not in kernel_matches:
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print_error("%s: %s" % (brown(_("Not a kernel")),
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teal(kernel_package),))
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return 1
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kernel_atom = entropy_client.open_repository(pkg_repo).retrieveAtom(pkg_id)
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# this can be None !
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target_tag = _get_target_tag(entropy_client, kernel_match)
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inst_repo = entropy_client.installed_repository()
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# try to look for the currently running kernel first if
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# --from-running is specified (use uname -r)
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latest_kernel = -1
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if from_running:
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try:
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uname_r = os.uname()[2]
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except OSError:
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uname_r = None
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except IndexError:
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uname_r = None
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pkg_file = None
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if uname_r is not None:
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pkg_file = _guess_kernel_package_file(uname_r)
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if pkg_file is not None:
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_pkg_ids = list(inst_repo.searchBelongs(pkg_file))
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# if more than one, get the latest
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_pkg_ids.sort(reverse=True)
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if _pkg_ids:
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latest_kernel = _pkg_ids[0]
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if latest_kernel == -1:
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print_error(
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brown(_("Cannot find your currently running kernel.")))
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print_error(
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brown(_("Try without --from-running.")))
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return 1
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if latest_kernel == -1:
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latest_kernel, _k_rc = inst_repo.atomMatch(
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KERNEL_BINARY_VIRTUAL)
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installed_revdeps = []
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if (latest_kernel != -1) and target_tag:
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installed_revdeps = entropy_client.get_removal_queue(
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[latest_kernel], recursive = False)
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# only pull in packages that are installed at this time.
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def _installed_pkgs_translator(inst_pkg_id):
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if inst_pkg_id == latest_kernel:
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# will be added later
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return None
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key, slot = inst_repo.retrieveKeySlot(inst_pkg_id)
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target_slot = _remove_tag_from_slot(slot) + "," + target_tag
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pkg_id, pkg_repo = entropy_client.atom_match(key,
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match_slot = target_slot)
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if pkg_id == -1:
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return None
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return pkg_id, pkg_repo
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matches = map(_installed_pkgs_translator, installed_revdeps)
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matches = [x for x in matches if x is not None]
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matches.append(kernel_match)
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opengl = _get_opengl_impl(pretend)
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install = SoloInstall([])
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rc, _show_cfgupd = install._install_action(
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entropy_client, True, True,
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pretend, ask, verbose,
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quiet, False, False, False, False, False,
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False, False, 1, [], package_matches=list(matches))
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if _show_cfgupd:
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install._show_config_files_update(entropy_client)
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if rc == 0 and not pretend:
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_set_opengl_impl(opengl)
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if target_tag:
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# if target_tag is None, we are unable to set the symlink
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_setup_kernel_symlink(target_tag)
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else:
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# try to guess, sigh, for now
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guessed_kernel_name = _guess_kernel_name(kernel_atom)
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if guessed_kernel_name:
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_setup_kernel_symlink(guessed_kernel_name)
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_show_kernel_warnings(kernel_atom)
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return rc
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def list_kernels(entropy_client):
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"""
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Return a sorted (by atom) list of currently available
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kernels.
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@param entropy_client: an Entropy Client object instance
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@type entropy_client: entropy.client.interfaces.Client
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@return: a sorted list of Entropy package matches
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@rtype: list
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"""
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matches, _rc = _get_kernels(entropy_client)
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key_sorter = lambda x: \
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entropy_client.open_repository(x[1]).retrieveAtom(x[0])
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return sorted(matches, key=key_sorter)
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