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Merge pull request #24054 from keszybz/initrd-no-reload

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Don't do daemon-reload in the initrd
This commit is contained in:
Frantisek Sumsal 2022-08-18 13:15:14 +00:00 committed by GitHub
parent 0a152619ac db5276215a
commit cd7ad0cbde
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GPG key ID: 4AEE18F83AFDEB23
15 changed files with 277 additions and 157 deletions
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4
TODO
View file

@ -1306,10 +1306,6 @@ Features:
* fstab-generator: default to tmpfs-as-root if only usr= is specified on the kernel cmdline
* initrd-parse-etc.service: can we skip daemon-reload if /sysroot/etc/fstab is missing?
Note that we start initrd-fs.target and initrd-cleanup.target there, so a straightforward
ConditionPathExists= is not enough.
* docs: bring https://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime up to date
* add a job mode that will fail if a transaction would mean stopping

213
man/bootup.xml
View file

@ -174,30 +174,30 @@ emergency.service | | |
available to the user.</para>
<programlisting>
(various (various (various
timers...) paths...) sockets...) (sound devices)
| | | |
v v v v
timers.target paths.target sockets.target sound.target
| | |
\______________ _|_________________/ (bluetooth devices)
\ / |
V v
basic.target bluetooth.target
|
__________/ \_______ (smartcard devices)
/ \ |
| | v
| v smartcard.target
v graphical-session-pre.target
(various user services) | (printers)
| v |
| (services for the graphical session) v
| | printer.target
v v
<emphasis>default.target</emphasis> graphical-session.target</programlisting>
(various (various (various
timers...) paths...) sockets...) (sound devices)
| | | |
v v v v
timers.target paths.target sockets.target sound.target
| | |
\______________ _|_________________/ (bluetooth devices)
\ / |
V v
basic.target bluetooth.target
|
__________/ \_______ (smartcard devices)
/ \ |
| | v
| v smartcard.target
v graphical-session-pre.target
(various user services) | (printers)
| v |
| (services for the graphical session) v
| | printer.target
v v
<emphasis>default.target</emphasis> graphical-session.target</programlisting>
</refsect1>
</refsect1>
<refsect1>
<title>Bootup in the Initial RAM Disk (initrd)</title>
@ -239,59 +239,59 @@ emergency.service | | |
<filename>/sysroot</filename>.
</para>
<programlisting> : (beginning identical to above)
:
v
basic.target
| emergency.service
______________________/| |
/ | v
| initrd-root-device.target <emphasis>emergency.target</emphasis>
| |
| v
| sysroot.mount
| |
| v
| initrd-root-fs.target
| |
| v
v initrd-parse-etc.service
(custom initrd |
services...) v
| (sysroot-usr.mount and
| various mounts marked
| with fstab option
| x-initrd.mount...)
| |
| v
| initrd-fs.target
\______________________ |
\|
v
initrd.target
|
v
initrd-cleanup.service
isolates to
initrd-switch-root.target
|
v
______________________/|
/ v
| initrd-udevadm-cleanup-db.service
v |
(custom initrd |
services...) |
\______________________ |
\|
v
initrd-switch-root.target
|
v
initrd-switch-root.service
|
v
Transition to Host OS</programlisting>
<programlisting> : (beginning identical to above)
:
v
basic.target
| emergency.service
______________________/| |
/ | v
| initrd-root-device.target <emphasis>emergency.target</emphasis>
| |
| v
| sysroot.mount
| |
| v
| initrd-root-fs.target
| |
| v
v initrd-parse-etc.service
(custom initrd |
services...) v
| (sysroot-usr.mount and
| various mounts marked
| with fstab option
| x-initrd.mount...)
| |
| v
| initrd-fs.target
\______________________ |
\|
v
initrd.target
|
v
initrd-cleanup.service
isolates to
initrd-switch-root.target
|
v
______________________/|
/ v
| initrd-udevadm-cleanup-db.service
v |
(custom initrd |
services...) |
\______________________ |
\|
v
initrd-switch-root.target
|
v
initrd-switch-root.service
|
v
Transition to Host OS</programlisting>
</refsect1>
<refsect1>
@ -300,33 +300,40 @@ emergency.service | | |
<para>System shutdown with systemd also consists of various target
units with some minimal ordering structure applied:</para>
<programlisting> (conflicts with (conflicts with
all system all file system
services) mounts, swaps,
| cryptsetup/
| veritysetup
| devices, ...)
| |
v v
shutdown.target umount.target
| |
\_______ ______/
\ /
v
(various low-level
services)
|
v
final.target
|
_____________________________________/ \_________________________________
/ | | \
| | | |
v v v v
systemd-reboot.service systemd-poweroff.service systemd-halt.service systemd-kexec.service
| | | |
v v v v
<emphasis>reboot.target</emphasis> <emphasis>poweroff.target</emphasis> <emphasis>halt.target</emphasis> <emphasis>kexec.target</emphasis></programlisting>
<programlisting> (conflicts with (conflicts with
all system all file system
services) mounts, swaps,
| cryptsetup/
| veritysetup
| devices, ...)
| |
v v
shutdown.target umount.target
| |
\_______ ______/
\ /
v
(various low-level
services)
|
v
final.target
|
___________________________/ \_________________
/ | | \
| | | |
v | | |
systemd-reboot.service | | |
| v | |
| systemd-poweroff.service | |
v | v |
<emphasis>reboot.target</emphasis> | systemd-halt.service |
v | v
<emphasis>poweroff.target</emphasis> | systemd-kexec.service
v |
<emphasis>halt.target</emphasis> |
v
<emphasis>kexec.target</emphasis></programlisting>
<para>Commonly used system shutdown targets are <emphasis>emphasized</emphasis>.</para>

4
meson.build
View file

@ -2324,6 +2324,10 @@ exe = executable(
install : true,
install_dir : systemgeneratordir)
meson.add_install_script(meson_make_symlink,
systemgeneratordir / 'systemd-fstab-generator',
rootlibexecdir / 'systemd-sysroot-fstab-check')
if want_tests != 'false'
test('test-fstab-generator',
test_fstab_generator_sh,

5
src/basic/def.h
View file

@ -5,6 +5,11 @@
#define DEFAULT_RESTART_USEC (100*USEC_PER_MSEC)
#define DEFAULT_CONFIRM_USEC (30*USEC_PER_SEC)
/* We use an extra-long timeout for the reload. This is because a reload or reexec means generators are rerun
* which are timed out after DEFAULT_TIMEOUT_USEC. Let's use twice that time here, so that the generators can
* have their timeout, and for everything else there's the same time budget in place. */
#define DAEMON_RELOAD_TIMEOUT_SEC (DEFAULT_TIMEOUT_USEC * 2)
#define DEFAULT_START_LIMIT_INTERVAL (10*USEC_PER_SEC)
#define DEFAULT_START_LIMIT_BURST 5

7
src/boot/bootctl.c
View file

@ -1838,8 +1838,11 @@ static int verb_status(int argc, char *argv[], void *userdata) {
bool have_bootloader_esp_uuid = efi_loader_get_device_part_uuid(&bootloader_esp_uuid) >= 0;
print_yes_no_line(false, have_bootloader_esp_uuid, "Boot loader sets ESP information");
if (have_bootloader_esp_uuid && !sd_id128_equal(esp_uuid, bootloader_esp_uuid))
printf("WARNING: The boot loader reports a different ESP UUID than detected!\n");
if (have_bootloader_esp_uuid && !sd_id128_is_null(esp_uuid) &&
!sd_id128_equal(esp_uuid, bootloader_esp_uuid))
printf("WARNING: The boot loader reports a different ESP UUID than detected ("SD_ID128_UUID_FORMAT_STR" vs. "SD_ID128_UUID_FORMAT_STR")!\n",
SD_ID128_FORMAT_VAL(bootloader_esp_uuid),
SD_ID128_FORMAT_VAL(esp_uuid));
if (stub) {
printf(" Stub: %s\n", stub);

2
src/fsck/fsck.c
View file

@ -52,7 +52,7 @@ static void start_target(const char *target, const char *mode) {
return;
}
log_info("Running request %s/start/%s", target, mode);
log_info("Requesting %s/start/%s", target, mode);
/* Start this unit only if we can replace basic.target with it */
r = sd_bus_call_method(bus,

118
src/fstab-generator/fstab-generator.c
View file

@ -5,6 +5,8 @@
#include <unistd.h>
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "chase-symlinks.h"
#include "fd-util.h"
#include "fileio.h"
@ -20,6 +22,7 @@
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "process-util.h"
#include "special.h"
#include "specifier.h"
#include "stat-util.h"
@ -39,6 +42,7 @@ typedef enum MountPointFlags {
MOUNT_RW_ONLY = 1 << 5,
} MountPointFlags;
static bool arg_sysroot_check = false;
static const char *arg_dest = NULL;
static const char *arg_dest_late = NULL;
static bool arg_fstab_enabled = true;
@ -119,6 +123,11 @@ static int add_swap(
return 0;
}
if (arg_sysroot_check) {
log_info("%s should be enabled in the initrd, will request daemon-reload.", what);
return true;
}
r = unit_name_from_path(what, ".swap", &name);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
@ -175,7 +184,7 @@ static int add_swap(
return r;
}
return 0;
return true;
}
static bool mount_is_network(struct mntent *me) {
@ -378,6 +387,11 @@ static int add_mount(
mount_point_ignore(where))
return 0;
if (arg_sysroot_check) {
log_info("%s should be mounted in the initrd, will request daemon-reload.", where);
return true;
}
r = fstab_filter_options(opts, "x-systemd.wanted-by\0", NULL, NULL, &wanted_by, NULL);
if (r < 0)
return r;
@ -567,7 +581,52 @@ static int add_mount(
return r;
}
return 0;
return true;
}
static int do_daemon_reload(void) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r, k;
log_debug("Calling org.freedesktop.systemd1.Manager.Reload()...");
r = bus_connect_system_systemd(&bus);
if (r < 0)
return log_error_errno(r, "Failed to get D-Bus connection: %m");
r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, "Reload");
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_call(bus, m, DAEMON_RELOAD_TIMEOUT_SEC, &error, NULL);
if (r < 0)
return log_error_errno(r, "Failed to reload daemon: %s", bus_error_message(&error, r));
/* We need to requeue the two targets so that any new units which previously were not part of the
* targets, and which we now added, will be started. */
r = 0;
FOREACH_STRING(unit, SPECIAL_INITRD_FS_TARGET, SPECIAL_SWAP_TARGET) {
log_info("Requesting %s/start/replace...", unit);
k = sd_bus_call_method(bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StartUnit",
&error,
NULL,
"ss", unit, "replace");
if (k < 0) {
log_error_errno(k, "Failed to (re)start %s: %s", unit, bus_error_message(&error, r));
if (r == 0)
r = k;
}
}
return r;
}
static const char* sysroot_fstab_path(void) {
@ -582,8 +641,10 @@ static int parse_fstab(bool initrd) {
if (initrd)
fstab = sysroot_fstab_path();
else
else {
fstab = fstab_path();
assert(!arg_sysroot_check);
}
log_debug("Parsing %s...", fstab);
@ -700,6 +761,8 @@ static int parse_fstab(bool initrd) {
target_unit);
}
if (arg_sysroot_check && k > 0)
return true; /* We found a mount or swap that would be started… */
if (r >= 0 && k < 0)
r = k;
}
@ -1126,12 +1189,14 @@ static int determine_usr(void) {
return determine_device(&arg_usr_what, arg_usr_hash, "usr");
}
static int run(const char *dest, const char *dest_early, const char *dest_late) {
/* If arg_sysroot_check is false, run as generator in the usual fashion.
* If it is true, check /sysroot/etc/fstab for any units that we'd want to mount
* in the initrd, and call daemon-reload. We will get reinvoked as a generator,
* with /sysroot/etc/fstab available, and then we can write additional units based
* on that file. */
static int run_generator(void) {
int r, r2 = 0, r3 = 0;
assert_se(arg_dest = dest);
assert_se(arg_dest_late = dest_late);
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
@ -1139,6 +1204,15 @@ static int run(const char *dest, const char *dest_early, const char *dest_late)
(void) determine_root();
(void) determine_usr();
if (arg_sysroot_check) {
r = parse_fstab(true);
if (r == 0)
log_debug("Nothing interesting found, not doing daemon-reload.");
if (r > 0)
r = do_daemon_reload();
return r;
}
/* Always honour root= and usr= in the kernel command line if we are in an initrd */
if (in_initrd()) {
r = add_sysroot_mount();
@ -1164,4 +1238,32 @@ static int run(const char *dest, const char *dest_early, const char *dest_late)
return r < 0 ? r : r2 < 0 ? r2 : r3;
}
DEFINE_MAIN_GENERATOR_FUNCTION(run);
static int run(int argc, char **argv) {
arg_sysroot_check = invoked_as(argv, "systemd-sysroot-fstab-check");
if (arg_sysroot_check) {
/* Run as in systemd-sysroot-fstab-check mode */
log_setup();
if (strv_length(argv) > 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program takes no arguments.");
if (!in_initrd())
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program is only useful in the initrd.");
} else {
/* Run in generator mode */
log_setup_generator();
if (!IN_SET(strv_length(argv), 2, 4))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program takes one or three arguments.");
arg_dest = ASSERT_PTR(argv[1]);
arg_dest_late = ASSERT_PTR(argv[argc > 3 ? 3 : 1]);
}
return run_generator();
}
DEFINE_MAIN_FUNCTION(run);

3
src/gpt-auto-generator/gpt-auto-generator.c
View file

@ -53,7 +53,8 @@ static int open_parent_block_device(dev_t devnum, int *ret_fd) {
r = sd_device_new_from_devnum(&d, 'b', devnum);
if (r < 0)
return log_debug_errno(r, "Failed to open device: %m");
return log_debug_errno(r, "Failed to create device object for block device "DEVNUM_FORMAT_STR": %m",
DEVNUM_FORMAT_VAL(devnum));
if (sd_device_get_devname(d, &name) < 0) {
r = sd_device_get_syspath(d, &name);

2
src/initctl/initctl.c
View file

@ -103,7 +103,7 @@ static int change_runlevel(Server *s, int runlevel) {
else
mode = "replace-irreversibly";
log_debug("Running request %s/start/%s", target, mode);
log_debug("Requesting %s/start/%s", target, mode);
r = sd_bus_call_method(
s->bus,

2
src/portable/portablectl.c
View file

@ -249,7 +249,7 @@ static int maybe_reload(sd_bus **bus) {
return bus_log_create_error(r);
/* Reloading the daemon may take long, hence set a longer timeout here */
r = sd_bus_call(*bus, m, DEFAULT_TIMEOUT_USEC * 2, &error, NULL);
r = sd_bus_call(*bus, m, DAEMON_RELOAD_TIMEOUT_SEC, &error, NULL);
if (r < 0)
return log_error_errno(r, "Failed to reload daemon: %s", bus_error_message(&error, r));

7
src/sulogin-shell/sulogin-shell.c
View file

@ -33,11 +33,8 @@ static int reload_manager(sd_bus *bus) {
if (r < 0)
return bus_log_create_error(r);
/* Note we use an extra-long timeout here. This is because a reload or reexec means generators are rerun which
* are timed out after DEFAULT_TIMEOUT_USEC. Let's use twice that time here, so that the generators can have
* their timeout, and for everything else there's the same time budget in place. */
r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC * 2, &error, NULL);
/* Reloading the daemon may take long, hence set a longer timeout here */
r = sd_bus_call(bus, m, DAEMON_RELOAD_TIMEOUT_SEC, &error, NULL);
if (r < 0)
return log_error_errno(r, "Failed to reload daemon: %s", bus_error_message(&error, r));

8
src/systemctl/systemctl-daemon-reload.c
View file

@ -37,12 +37,8 @@ int daemon_reload(enum action action, bool graceful) {
if (r < 0)
return bus_log_create_error(r);
/* Note we use an extra-long timeout here. This is because a reload or reexec means generators are
* rerun which are timed out after DEFAULT_TIMEOUT_USEC. Let's use twice that time here, so that the
* generators can have their timeout, and for everything else there's the same time budget in
* place. */
r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC * 2, &error, NULL);
/* Reloading the daemon may take long, hence set a longer timeout here */
r = sd_bus_call(bus, m, DAEMON_RELOAD_TIMEOUT_SEC, &error, NULL);
/* On reexecution, we expect a disconnect, not a reply */
if (IN_SET(r, -ETIMEDOUT, -ECONNRESET) && action == ACTION_REEXEC)

24
units/initrd-parse-etc.service
View file

@ -1,24 +0,0 @@
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Reload Configuration from the Real Root
DefaultDependencies=no
Requires=initrd-root-fs.target
After=initrd-root-fs.target
OnFailure=emergency.target
OnFailureJobMode=replace-irreversibly
AssertPathExists=/etc/initrd-release
[Service]
Type=oneshot
ExecStartPre=-systemctl daemon-reload
# we have to retrigger initrd-fs.target after daemon-reload
ExecStart=-systemctl --no-block start initrd-fs.target
ExecStart=systemctl --no-block start initrd-cleanup.service

33
units/initrd-parse-etc.service.in Normal file
View file

@ -0,0 +1,33 @@
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Mountpoints Configured in the Real Root
AssertPathExists=/etc/initrd-release
DefaultDependencies=no
Requires=initrd-root-fs.target
After=initrd-root-fs.target
OnFailure=emergency.target
OnFailureJobMode=replace-irreversibly
[Service]
Type=oneshot
# FIXME: once dracut is patched to install the symlink, change to:
# ExecStart={{ROOTLIBEXECDIR}}/systemd-sysroot-fstab-check
ExecStart=@{{SYSTEM_GENERATOR_DIR}}/systemd-fstab-generator systemd-sysroot-fstab-check
# We want to enqueue initrd-cleanup.service/start after we finished the part
# above. It can't be part of the initial transaction, because non-oneshot units
# use Conflicts=initrd-cleanup.service to be terminated before we switch root.
# Effectively, initrd-parse-etc.service acts as a synchronization point after
# which cleanup of the initrd processes starts.
ExecStart=systemctl --no-block start initrd-cleanup.service

2
units/meson.build
View file

@ -36,7 +36,6 @@ units = [
['suspend-then-hibernate.target', 'ENABLE_HIBERNATE'],
['initrd-cleanup.service', 'ENABLE_INITRD'],
['initrd-fs.target', 'ENABLE_INITRD'],
['initrd-parse-etc.service', 'ENABLE_INITRD'],
['initrd-root-device.target', 'ENABLE_INITRD'],
['initrd-root-fs.target', 'ENABLE_INITRD'],
['initrd-switch-root.service', 'ENABLE_INITRD'],
@ -179,6 +178,7 @@ in_units = [
['emergency.service', ''],
['getty@.service', '',
'autovt@.service'],
['initrd-parse-etc.service', 'ENABLE_INITRD'],
['kmod-static-nodes.service', 'HAVE_KMOD ENABLE_TMPFILES',
'sysinit.target.wants/'],
['quotaon.service', 'ENABLE_QUOTACHECK'],