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vmspawn: support machined registration

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Sam Leonard 2024-02-20 13:13:16 +00:00
parent 6aa14b283b
commit b0dc766852
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6 changed files with 140 additions and 0 deletions
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35
man/systemd-vmspawn.xml
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@ -274,6 +274,41 @@
<xi:include href="version-info.xml" xpointer="v255"/>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--uuid=</option></term>
<listitem><para>Set the specified UUID for the virtual machine. The
init system will initialize
<filename>/etc/machine-id</filename> from this if this file is
not set yet. Note that this option takes effect only if
<filename>/etc/machine-id</filename> in the virtual machine is
unpopulated.</para>
<xi:include href="version-info.xml" xpointer="v256"/></listitem>
</varlistentry>
</variablelist>
</refsect2>
<refsect2>
<title>Property Options</title>
<variablelist>
<varlistentry>
<term><option>--register=</option></term>
<listitem><para>Controls whether the virtual machine is registered with
<citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry>. Takes a
boolean argument, which defaults to <literal>yes</literal> when running as root, and <literal>no</literal> when
running as a regular user. This ensures that the virtual machine is accessible via
<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
<para>Note: root privileges are required to use this option as registering with
<citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry>
requires privileged D-Bus method calls.</para>
<xi:include href="version-info.xml" xpointer="v256"/></listitem>
</varlistentry>
</variablelist>
</refsect2>

1
src/vmspawn/meson.build
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@ -5,6 +5,7 @@ libvmspawn_core_sources = files(
'vmspawn-util.c',
'vmspawn-scope.c',
'vmspawn-mount.c',
'vmspawn-register.c',
)
libvmspawn_core = static_library(
'vmspawn-core',

51
src/vmspawn/vmspawn-register.c Normal file
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@ -0,0 +1,51 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "sd-bus.h"
#include "sd-id128.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "macro.h"
#include "process-util.h"
#include "string-util.h"
#include "vmspawn-register.h"
int register_machine(sd_bus *bus, const char *machine_name, sd_id128_t uuid, const char *service, const char *directory) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(bus);
assert(machine_name);
assert(service);
r = bus_call_method(
bus,
bus_machine_mgr,
"RegisterMachine",
&error,
NULL,
"sayssus",
machine_name,
SD_BUS_MESSAGE_APPEND_ID128(uuid),
service,
"vm",
(uint32_t) getpid_cached(),
strempty(directory));
if (r < 0)
return log_error_errno(r, "Failed to register machine: %s", bus_error_message(&error, r));
return 0;
}
int unregister_machine(sd_bus *bus, const char *machine_name) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(bus);
r = bus_call_method(bus, bus_machine_mgr, "UnregisterMachine", &error, NULL, "s", machine_name);
if (r < 0)
log_debug("Failed to unregister machine: %s", bus_error_message(&error, r));
return 0;
}

7
src/vmspawn/vmspawn-register.h Normal file
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@ -0,0 +1,7 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "sd-bus.h"
#include "sd-id128.h"
int register_machine(sd_bus *bus, const char *machine_name, sd_id128_t uuid, const char *service, const char *directory);
int unregister_machine(sd_bus *bus, const char *machine_name);

1
src/vmspawn/vmspawn-settings.h
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@ -17,6 +17,7 @@ typedef enum ConsoleMode {
typedef enum SettingsMask {
SETTING_START_MODE = UINT64_C(1) << 0,
SETTING_MACHINE_ID = UINT64_C(1) << 6,
SETTING_BIND_MOUNTS = UINT64_C(1) << 11,
SETTING_DIRECTORY = UINT64_C(1) << 26,
SETTING_CREDENTIALS = UINT64_C(1) << 30,

45
src/vmspawn/vmspawn.c
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@ -57,6 +57,7 @@
#include "tmpfile-util.h"
#include "unit-name.h"
#include "vmspawn-mount.h"
#include "vmspawn-register.h"
#include "vmspawn-scope.h"
#include "vmspawn-settings.h"
#include "vmspawn-util.h"
@ -86,6 +87,8 @@ static char *arg_runtime_directory = NULL;
static char *arg_forward_journal = NULL;
static bool arg_runtime_directory_created = false;
static bool arg_privileged = false;
static bool arg_register = false;
static sd_id128_t arg_uuid = {};
static char **arg_kernel_cmdline_extra = NULL;
static char **arg_extra_drives = NULL;
static char *arg_background = NULL;
@ -139,6 +142,9 @@ static int help(void) {
" --firmware=PATH|list Select firmware definition file (or list available)\n"
"\n%3$sSystem Identity:%4$s\n"
" -M --machine=NAME Set the machine name for the VM\n"
" --uuid=UUID Set a specific machine UUID for the VM\n"
"\n%3$sProperties:%4$s\n"
" --register=BOOLEAN Register VM with systemd-machined\n"
"\n%3$sUser Namespacing:%4$s\n"
" --private-users=UIDBASE[:NUIDS]\n"
" Configure the UID/GID range to map into the\n"
@ -186,6 +192,8 @@ static int parse_argv(int argc, char *argv[]) {
ARG_INITRD,
ARG_QEMU_GUI,
ARG_NETWORK_USER_MODE,
ARG_UUID,
ARG_REGISTER,
ARG_BIND,
ARG_BIND_RO,
ARG_EXTRA_DRIVE,
@ -223,6 +231,8 @@ static int parse_argv(int argc, char *argv[]) {
{ "qemu-gui", no_argument, NULL, ARG_QEMU_GUI }, /* compat option */
{ "network-tap", no_argument, NULL, 'n' },
{ "network-user-mode", no_argument, NULL, ARG_NETWORK_USER_MODE },
{ "uuid", required_argument, NULL, ARG_UUID },
{ "register", required_argument, NULL, ARG_REGISTER },
{ "bind", required_argument, NULL, ARG_BIND },
{ "bind-ro", required_argument, NULL, ARG_BIND_RO },
{ "extra-drive", required_argument, NULL, ARG_EXTRA_DRIVE },
@ -372,6 +382,26 @@ static int parse_argv(int argc, char *argv[]) {
arg_network_stack = NETWORK_STACK_USER;
break;
case ARG_UUID:
r = id128_from_string_nonzero(optarg, &arg_uuid);
if (r == -ENXIO)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Machine UUID may not be all zeroes.");
if (r < 0)
return log_error_errno(r, "Invalid UUID: %s", optarg);
arg_settings_mask |= SETTING_MACHINE_ID;
break;
case ARG_REGISTER:
r = parse_boolean(optarg);
if (r < 0) {
log_error("Failed to parse --register= argument: %s", optarg);
return r;
}
arg_register = r;
break;
case ARG_BIND:
case ARG_BIND_RO:
r = runtime_mount_parse(&arg_runtime_mounts, optarg, c == ARG_BIND_RO);
@ -1093,6 +1123,12 @@ static int run_virtual_machine(int kvm_device_fd, int vhost_device_fd) {
if (r < 0)
return r;
if (arg_register) {
r = register_machine(bus, arg_machine, arg_uuid, trans_scope, arg_directory);
if (r < 0)
return r;
}
bool use_kvm = arg_kvm > 0;
if (arg_kvm < 0) {
r = qemu_check_kvm_support();
@ -1747,6 +1783,9 @@ static int run_virtual_machine(int kvm_device_fd, int vhost_device_fd) {
if (r < 0)
return log_error_errno(r, "Failed to run event loop: %m");
if (arg_register)
(void) unregister_machine(bus, arg_machine);
if (use_vsock) {
if (exit_status == INT_MAX) {
log_debug("Couldn't retrieve inner EXIT_STATUS from VSOCK");
@ -1825,6 +1864,9 @@ static int verify_arguments(void) {
if (!strv_isempty(arg_initrds) && !arg_linux)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Option --initrd= cannot be used without --linux=.");
if (arg_register && !arg_privileged)
return log_error_errno(SYNTHETIC_ERRNO(EPERM), "--register= requires root privileges, refusing.");
return 0;
}
@ -1836,6 +1878,9 @@ static int run(int argc, char *argv[]) {
arg_privileged = getuid() == 0;
/* don't attempt to register as a machine when running as a user */
arg_register = arg_privileged;
r = parse_argv(argc, argv);
if (r <= 0)
return r;