systemd: Build the systemctl executable

Instead of the python re-implementation build the actual systemctl from
the systemd source tree. The python script was used when systemd didn't
provide an option to build individual executables. It is possible in the
meantime, so instead of always adapting the script when there's a new
functionality, we simply use upstream implementation.

License-Update: Base recipe is used

(From OE-Core rev: 7a580800db391891a3a0f838c4ae6e1513c710a2)

Signed-off-by: Vyacheslav Yurkov <uvv.mail@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 11 insertions, 388 deletions

diff --git a/meta/recipes-core/systemd/systemd-systemctl-native.bb b/meta/recipes-core/systemd/systemd-systemctl-native.bb
index ffa024caef..73862b4e23 100644
--- a/meta/recipes-core/systemd/systemd-systemctl-native.bb
+++ b/meta/recipes-core/systemd/systemd-systemctl-native.bb
@@ -1,17 +1,16 @@
-SUMMARY = "Wrapper for enabling systemd services"
+SUMMARY = "Systemctl executable from systemd"
 
-LICENSE = "MIT"
-LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+require systemd.inc
 
+DEPENDS = "gperf-native libcap-native util-linux-native python3-jinja2-native"
 
-inherit native
+inherit pkgconfig meson native
 
-SRC_URI = "file://systemctl"
+MESON_TARGET = "systemctl:executable"
+MESON_INSTALL_TAGS = "systemctl"
+EXTRA_OEMESON:append = " -Dlink-systemctl-shared=false"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
-
-do_install() {
-        install -d ${D}${bindir}
-        install -m 0755 ${S}/systemctl ${D}${bindir}
-}
+# Systemctl is supposed to operate on target, but the target sysroot is not
+# determined at run-time, but rather set during configure
+# More details are here https://github.com/systemd/systemd/issues/35897#issuecomment-2665405887
+EXTRA_OEMESON:append = " --sysconfdir ${sysconfdir_native}"
diff --git a/meta/recipes-core/systemd/systemd-systemctl/systemctl b/meta/recipes-core/systemd/systemd-systemctl/systemctl
deleted file mode 100755
index 65e3157859..0000000000
--- a/meta/recipes-core/systemd/systemd-systemctl/systemctl
+++ /dev/null
@@ -1,376 +0,0 @@
-#!/usr/bin/env python3
-"""systemctl: subset of systemctl used for image construction
-
-Mask/preset systemd units
-"""
-
-import argparse
-import fnmatch
-import os
-import re
-import sys
-
-from collections import namedtuple
-from itertools import chain
-from pathlib import Path
-
-version = 1.0
-
-ROOT = Path("/")
-SYSCONFDIR = Path("etc")
-BASE_LIBDIR = Path("lib")
-LIBDIR = Path("usr", "lib")
-
-locations = list()
-
-
-class SystemdFile():
-    """Class representing a single systemd configuration file"""
-
-    _clearable_keys = ['WantedBy']
-
-    def __init__(self, root, path, instance_unit_name, unit_type):
-        self.sections = dict()
-        self._parse(root, path)
-        dirname = os.path.basename(path.name) + ".d"
-        for location in locations:
-            files = (root / location / unit_type / dirname).glob("*.conf")
-            if instance_unit_name:
-                inst_dirname = instance_unit_name + ".d"
-                files = chain(files, (root / location / unit_type / inst_dirname).glob("*.conf"))
-            for path2 in sorted(files):
-                self._parse(root, path2)
-
-    def _parse(self, root, path):
-        """Parse a systemd syntax configuration file
-
-        Args:
-            path: A pathlib.Path object pointing to the file
-
-        """
-        skip_re = re.compile(r"^\s*([#;]|$)")
-        section_re = re.compile(r"^\s*\[(?P<section>.*)\]")
-        kv_re = re.compile(r"^\s*(?P<key>[^\s]+)\s*=\s*(?P<value>.*)")
-        section = None
-
-        if path.is_symlink():
-            try:
-                path.resolve()
-            except FileNotFoundError:
-                # broken symlink, try relative to root
-                path = root / Path(os.readlink(str(path))).relative_to(ROOT)
-
-        with path.open() as f:
-            for line in f:
-                if skip_re.match(line):
-                    continue
-
-                line = line.strip()
-                m = section_re.match(line)
-                if m:
-                    if m.group('section') not in self.sections:
-                        section = dict()
-                        self.sections[m.group('section')] = section
-                    else:
-                        section = self.sections[m.group('section')]
-                    continue
-
-                while line.endswith("\\"):
-                    line += f.readline().rstrip("\n")
-
-                m = kv_re.match(line)
-                k = m.group('key')
-                v = m.group('value')
-                if k not in section:
-                    section[k] = list()
-
-                # If we come across a "key=" line for a "clearable key", then
-                # forget all preceding assignments. This works because we are
-                # processing files in correct parse order.
-                if k in self._clearable_keys and not v:
-                    del section[k]
-                    continue
-
-                section[k].extend(v.split())
-
-    def get(self, section, prop):
-        """Get a property from section
-
-        Args:
-            section: Section to retrieve property from
-            prop: Property to retrieve
-
-        Returns:
-            List representing all properties of type prop in section.
-
-        Raises:
-            KeyError: if ``section`` or ``prop`` not found
-        """
-        return self.sections[section][prop]
-
-
-class Presets():
-    """Class representing all systemd presets"""
-    def __init__(self, scope, root):
-        self.directives = list()
-        self._collect_presets(scope, root)
-
-    def _parse_presets(self, presets):
-        """Parse presets out of a set of preset files"""
-        skip_re = re.compile(r"^\s*([#;]|$)")
-        directive_re = re.compile(r"^\s*(?P<action>enable|disable)\s+(?P<unit_name>(.+))")
-
-        Directive = namedtuple("Directive", "action unit_name")
-        for preset in presets:
-            with preset.open() as f:
-                for line in f:
-                    m = directive_re.match(line)
-                    if m:
-                        directive = Directive(action=m.group('action'),
-                                              unit_name=m.group('unit_name'))
-                        self.directives.append(directive)
-                    elif skip_re.match(line):
-                        pass
-                    else:
-                        sys.exit("Unparsed preset line in {}".format(preset))
-
-    def _collect_presets(self, scope, root):
-        """Collect list of preset files"""
-        presets = dict()
-        for location in locations:
-            paths = (root / location / scope).glob("*.preset")
-            for path in paths:
-                # earlier names override later ones
-                if path.name not in presets:
-                    presets[path.name] = path
-
-        self._parse_presets([v for k, v in sorted(presets.items())])
-
-    def state(self, unit_name):
-        """Return state of preset for unit_name
-
-        Args:
-            presets: set of presets
-            unit_name: name of the unit
-
-        Returns:
-            None: no matching preset
-            `enable`: unit_name is enabled
-            `disable`: unit_name is disabled
-        """
-        for directive in self.directives:
-            if fnmatch.fnmatch(unit_name, directive.unit_name):
-                return directive.action
-
-        return None
-
-
-def add_link(path, target):
-    try:
-        path.parent.mkdir(parents=True)
-    except FileExistsError:
-        pass
-    if not path.is_symlink():
-        print("ln -s {} {}".format(target, path))
-        path.symlink_to(target)
-
-
-class SystemdUnitNotFoundError(Exception):
-    def __init__(self, path, unit):
-        self.path = path
-        self.unit = unit
-
-
-class SystemdUnit():
-    def __init__(self, root, unit, unit_type):
-        self.root = root
-        self.unit = unit
-        self.unit_type = unit_type
-        self.config = None
-
-    def _path_for_unit(self, unit):
-        for location in locations:
-            path = self.root / location / self.unit_type / unit
-            if path.exists() or path.is_symlink():
-                return path
-
-        raise SystemdUnitNotFoundError(self.root, unit)
-
-    def _process_deps(self, config, service, location, prop, dirstem, instance):
-        systemdir = self.root / SYSCONFDIR / "systemd" / self.unit_type
-
-        target = ROOT / location.relative_to(self.root)
-        try:
-            for dependent in config.get('Install', prop):
-                # expand any %i to instance (ignoring escape sequence %%)
-                dependent = re.sub("([^%](%%)*)%i", "\\g<1>{}".format(instance), dependent)
-                wants = systemdir / "{}.{}".format(dependent, dirstem) / service
-                add_link(wants, target)
-
-        except KeyError:
-            pass
-
-    def enable(self, units_enabled=[]):
-        # if we're enabling an instance, first extract the actual instance
-        # then figure out what the template unit is
-        template = re.match(r"[^@]+@(?P<instance>[^\.]*)\.", self.unit)
-        instance_unit_name = None
-        if template:
-            instance = template.group('instance')
-            if instance != "":
-                instance_unit_name = self.unit
-            unit = re.sub(r"@[^\.]*\.", "@.", self.unit, 1)
-        else:
-            instance = None
-            unit = self.unit
-
-        if instance_unit_name is not None:
-            try:
-                # Try first with instance unit name. Systemd allows to create instance unit files
-                # e.g. `gnome-shell@wayland.service` which cause template unit file to be ignored
-                # for the instance for which instance unit file is present. In that case, there may
-                # not be any template file at all.
-                path = self._path_for_unit(instance_unit_name)
-            except SystemdUnitNotFoundError:
-                path = self._path_for_unit(unit)
-        else:
-            path = self._path_for_unit(unit)
-
-        if path.is_symlink():
-            # ignore aliases
-            return
-
-        config = SystemdFile(self.root, path, instance_unit_name, self.unit_type)
-        if instance == "":
-            try:
-                default_instance = config.get('Install', 'DefaultInstance')[0]
-            except KeyError:
-                # no default instance, so nothing to enable
-                return
-
-            service = self.unit.replace("@.",
-                                        "@{}.".format(default_instance))
-        else:
-            service = self.unit
-
-        self._process_deps(config, service, path, 'WantedBy', 'wants', instance)
-        self._process_deps(config, service, path, 'RequiredBy', 'requires', instance)
-
-        try:
-            for also in config.get('Install', 'Also'):
-                try:
-                     units_enabled.append(unit)
-                     if also not in units_enabled:
-                        SystemdUnit(self.root, also, self.unit_type).enable(units_enabled)
-                except SystemdUnitNotFoundError as e:
-                    sys.exit("Error: Systemctl also enable issue with  %s (%s)" % (service, e.unit))
-
-        except KeyError:
-            pass
-
-        systemdir = self.root / SYSCONFDIR / "systemd" / self.unit_type
-        target = ROOT / path.relative_to(self.root)
-        try:
-            for dest in config.get('Install', 'Alias'):
-                alias = systemdir / dest
-                add_link(alias, target)
-
-        except KeyError:
-            pass
-
-    def mask(self):
-        systemdir = self.root / SYSCONFDIR / "systemd" / self.unit_type
-        add_link(systemdir / self.unit, "/dev/null")
-
-
-def collect_services(root, unit_type):
-    """Collect list of service files"""
-    services = set()
-    for location in locations:
-        paths = (root / location / unit_type).glob("*")
-        for path in paths:
-            if path.is_dir():
-                continue
-            services.add(path.name)
-
-    return services
-
-
-def preset_all(root, unit_type):
-    presets = Presets('{}-preset'.format(unit_type), root)
-    services = collect_services(root, unit_type)
-
-    for service in services:
-        state = presets.state(service)
-
-        if state == "enable" or state is None:
-            try:
-                SystemdUnit(root, service, unit_type).enable()
-            except SystemdUnitNotFoundError:
-                sys.exit("Error: Systemctl preset_all issue in %s" % service)
-
-    # If we populate the systemd links we also create /etc/machine-id, which
-    # allows systemd to boot with the filesystem read-only before generating
-    # a real value and then committing it back.
-    #
-    # For the stateless configuration, where /etc is generated at runtime
-    # (for example on a tmpfs), this script shouldn't run at all and we
-    # allow systemd to completely populate /etc.
-    (root / SYSCONFDIR / "machine-id").touch()
-
-
-def main():
-    if sys.version_info < (3, 4, 0):
-        sys.exit("Python 3.4 or greater is required")
-
-    parser = argparse.ArgumentParser()
-    parser.add_argument('command', nargs='?', choices=['enable', 'mask',
-                                                     'preset-all'])
-    parser.add_argument('service', nargs=argparse.REMAINDER)
-    parser.add_argument('--root')
-    parser.add_argument('--preset-mode',
-                        choices=['full', 'enable-only', 'disable-only'],
-                        default='full')
-    parser.add_argument('--global', dest="opt_global", action="store_true", default=False)
-
-    args = parser.parse_args()
-
-    root = Path(args.root) if args.root else ROOT
-
-    locations.append(SYSCONFDIR / "systemd")
-    # Handle the usrmerge case by ignoring /lib when it's a symlink
-    if not (root / BASE_LIBDIR).is_symlink():
-        locations.append(BASE_LIBDIR / "systemd")
-    locations.append(LIBDIR / "systemd")
-
-    command = args.command
-    if not command:
-        parser.print_help()
-        return 0
-
-    unit_type = "user" if args.opt_global else "system"
-
-    if command == "mask":
-        for service in args.service:
-            try:
-                SystemdUnit(root, service, unit_type).mask()
-            except SystemdUnitNotFoundError as e:
-                sys.exit("Error: Systemctl main mask issue in %s (%s)" % (service, e.unit))
-    elif command == "enable":
-        for service in args.service:
-            try:
-                SystemdUnit(root, service, unit_type).enable()
-            except SystemdUnitNotFoundError as e:
-                sys.exit("Error: Systemctl main enable issue in %s (%s)" % (service, e.unit))
-    elif command == "preset-all":
-        if len(args.service) != 0:
-            sys.exit("Too many arguments.")
-        if args.preset_mode != "enable-only":
-            sys.exit("Only enable-only is supported as preset-mode.")
-        preset_all(root, unit_type)
-    else:
-        raise RuntimeError()
-
-
-if __name__ == '__main__':
-    main()