37c1d5e97d
When we are attempting to create directory somewhere in the bowels of /var/lib and get an error that it already exists, it can be quite hard to diagnose what is wrong (especially for a user who is not aware that the directory must have the specified owner, and permissions not looser than what was requested). Let's print a warning in most cases. A warning is appropriate, because such state is usually a sign of borked installation and needs to be resolved by the adminstrator. $ build/test-fs-util Path "/tmp/test-readlink_and_make_absolute" already exists and is not a directory, refusing. (or) Directory "/tmp/test-readlink_and_make_absolute" already exists, but has mode 0775 that is too permissive (0755 was requested), refusing. (or) Directory "/tmp/test-readlink_and_make_absolute" already exists, but is owned by 1001:1000 (1000:1000 was requested), refusing. Assertion 'mkdir_safe(tempdir, 0755, getuid(), getgid(), MKDIR_WARN_MODE) >= 0' failed at ../src/test/test-fs-util.c:320, function test_readlink_and_make_absolute(). Aborting. No functional change except for the new log lines.
724 lines
20 KiB
C
724 lines
20 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
|
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|
|
Copyright 2011 Lennart Poettering
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|
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systemd is free software; you can redistribute it and/or modify it
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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.
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|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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|
|
#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio_ext.h>
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|
|
#include "sd-messages.h"
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|
|
|
#include "alloc-util.h"
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#include "bus-error.h"
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#include "bus-util.h"
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#include "escape.h"
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|
#include "extract-word.h"
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|
#include "fd-util.h"
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|
#include "fileio.h"
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|
#include "format-util.h"
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#include "hashmap.h"
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#include "machine-dbus.h"
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#include "machine.h"
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|
#include "mkdir.h"
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#include "parse-util.h"
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#include "process-util.h"
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|
#include "special.h"
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#include "stdio-util.h"
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#include "string-table.h"
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|
#include "terminal-util.h"
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|
#include "unit-name.h"
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|
#include "user-util.h"
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|
#include "util.h"
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|
|
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Machine* machine_new(Manager *manager, MachineClass class, const char *name) {
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Machine *m;
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assert(manager);
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assert(class < _MACHINE_CLASS_MAX);
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assert(name);
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/* Passing class == _MACHINE_CLASS_INVALID here is fine. It
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* means as much as "we don't know yet", and that we'll figure
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* it out later when loading the state file. */
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|
|
m = new0(Machine, 1);
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|
if (!m)
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return NULL;
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|
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|
m->name = strdup(name);
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|
if (!m->name)
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goto fail;
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|
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|
if (class != MACHINE_HOST) {
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m->state_file = strappend("/run/systemd/machines/", m->name);
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if (!m->state_file)
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goto fail;
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|
}
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m->class = class;
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|
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if (hashmap_put(manager->machines, m->name, m) < 0)
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goto fail;
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m->manager = manager;
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|
return m;
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|
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|
fail:
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free(m->state_file);
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free(m->name);
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return mfree(m);
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}
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void machine_free(Machine *m) {
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assert(m);
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while (m->operations)
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operation_free(m->operations);
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|
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if (m->in_gc_queue)
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LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
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machine_release_unit(m);
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free(m->scope_job);
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(void) hashmap_remove(m->manager->machines, m->name);
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|
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if (m->manager->host_machine == m)
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m->manager->host_machine = NULL;
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|
if (m->leader > 0)
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(void) hashmap_remove_value(m->manager->machine_leaders, PID_TO_PTR(m->leader), m);
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|
|
|
sd_bus_message_unref(m->create_message);
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free(m->name);
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free(m->state_file);
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free(m->service);
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free(m->root_directory);
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free(m->netif);
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free(m);
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}
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int machine_save(Machine *m) {
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_cleanup_free_ char *temp_path = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(m);
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|
if (!m->state_file)
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return 0;
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|
|
if (!m->started)
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return 0;
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|
r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0, MKDIR_WARN_MODE);
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|
if (r < 0)
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goto fail;
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|
r = fopen_temporary(m->state_file, &f, &temp_path);
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|
if (r < 0)
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|
goto fail;
|
|
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|
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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|
(void) fchmod(fileno(f), 0644);
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|
fprintf(f,
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"# This is private data. Do not parse.\n"
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"NAME=%s\n",
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|
m->name);
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|
|
|
if (m->unit) {
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|
_cleanup_free_ char *escaped;
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|
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|
escaped = cescape(m->unit);
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|
if (!escaped) {
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|
r = -ENOMEM;
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|
goto fail;
|
|
}
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|
|
|
fprintf(f, "SCOPE=%s\n", escaped); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */
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|
}
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|
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|
if (m->scope_job)
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|
fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
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|
|
|
if (m->service) {
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|
_cleanup_free_ char *escaped;
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|
escaped = cescape(m->service);
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|
if (!escaped) {
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|
r = -ENOMEM;
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|
goto fail;
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|
}
|
|
fprintf(f, "SERVICE=%s\n", escaped);
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|
}
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|
|
|
if (m->root_directory) {
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|
_cleanup_free_ char *escaped;
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|
escaped = cescape(m->root_directory);
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|
if (!escaped) {
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|
r = -ENOMEM;
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|
goto fail;
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|
}
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|
fprintf(f, "ROOT=%s\n", escaped);
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|
}
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if (!sd_id128_is_null(m->id))
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fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
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|
if (m->leader != 0)
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fprintf(f, "LEADER="PID_FMT"\n", m->leader);
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if (m->class != _MACHINE_CLASS_INVALID)
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fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
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if (dual_timestamp_is_set(&m->timestamp))
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fprintf(f,
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"REALTIME="USEC_FMT"\n"
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"MONOTONIC="USEC_FMT"\n",
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m->timestamp.realtime,
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m->timestamp.monotonic);
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|
if (m->n_netif > 0) {
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unsigned i;
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|
fputs("NETIF=", f);
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for (i = 0; i < m->n_netif; i++) {
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if (i != 0)
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fputc(' ', f);
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|
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|
fprintf(f, "%i", m->netif[i]);
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|
}
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|
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|
fputc('\n', f);
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|
}
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|
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|
r = fflush_and_check(f);
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|
if (r < 0)
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|
goto fail;
|
|
|
|
if (rename(temp_path, m->state_file) < 0) {
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|
r = -errno;
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|
goto fail;
|
|
}
|
|
|
|
if (m->unit) {
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|
char *sl;
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|
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|
/* Create a symlink from the unit name to the machine
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|
* name, so that we can quickly find the machine for
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* each given unit. Ignore error. */
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|
sl = strjoina("/run/systemd/machines/unit:", m->unit);
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|
(void) symlink(m->name, sl);
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|
}
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|
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|
return 0;
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|
|
|
fail:
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|
(void) unlink(m->state_file);
|
|
|
|
if (temp_path)
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(void) unlink(temp_path);
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|
return log_error_errno(r, "Failed to save machine data %s: %m", m->state_file);
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|
}
|
|
|
|
static void machine_unlink(Machine *m) {
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|
assert(m);
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|
|
|
if (m->unit) {
|
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|
char *sl;
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|
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|
sl = strjoina("/run/systemd/machines/unit:", m->unit);
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|
(void) unlink(sl);
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}
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|
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if (m->state_file)
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|
(void) unlink(m->state_file);
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|
}
|
|
|
|
int machine_load(Machine *m) {
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|
_cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL, *netif = NULL;
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|
int r;
|
|
|
|
assert(m);
|
|
|
|
if (!m->state_file)
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|
return 0;
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|
|
|
r = parse_env_file(m->state_file, NEWLINE,
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|
"SCOPE", &m->unit,
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|
"SCOPE_JOB", &m->scope_job,
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|
"SERVICE", &m->service,
|
|
"ROOT", &m->root_directory,
|
|
"ID", &id,
|
|
"LEADER", &leader,
|
|
"CLASS", &class,
|
|
"REALTIME", &realtime,
|
|
"MONOTONIC", &monotonic,
|
|
"NETIF", &netif,
|
|
NULL);
|
|
if (r < 0) {
|
|
if (r == -ENOENT)
|
|
return 0;
|
|
|
|
return log_error_errno(r, "Failed to read %s: %m", m->state_file);
|
|
}
|
|
|
|
if (id)
|
|
sd_id128_from_string(id, &m->id);
|
|
|
|
if (leader)
|
|
parse_pid(leader, &m->leader);
|
|
|
|
if (class) {
|
|
MachineClass c;
|
|
|
|
c = machine_class_from_string(class);
|
|
if (c >= 0)
|
|
m->class = c;
|
|
}
|
|
|
|
if (realtime)
|
|
timestamp_deserialize(realtime, &m->timestamp.realtime);
|
|
if (monotonic)
|
|
timestamp_deserialize(monotonic, &m->timestamp.monotonic);
|
|
|
|
if (netif) {
|
|
size_t allocated = 0, nr = 0;
|
|
const char *p;
|
|
int *ni = NULL;
|
|
|
|
p = netif;
|
|
for (;;) {
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|
_cleanup_free_ char *word = NULL;
|
|
int ifi;
|
|
|
|
r = extract_first_word(&p, &word, NULL, 0);
|
|
if (r == 0)
|
|
break;
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r < 0) {
|
|
log_warning_errno(r, "Failed to parse NETIF: %s", netif);
|
|
break;
|
|
}
|
|
|
|
if (parse_ifindex(word, &ifi) < 0)
|
|
continue;
|
|
|
|
if (!GREEDY_REALLOC(ni, allocated, nr+1)) {
|
|
free(ni);
|
|
return log_oom();
|
|
}
|
|
|
|
ni[nr++] = ifi;
|
|
}
|
|
|
|
free(m->netif);
|
|
m->netif = ni;
|
|
m->n_netif = nr;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
|
|
int r = 0;
|
|
|
|
assert(m);
|
|
assert(m->class != MACHINE_HOST);
|
|
|
|
if (!m->unit) {
|
|
_cleanup_free_ char *escaped = NULL;
|
|
char *scope, *description, *job = NULL;
|
|
|
|
escaped = unit_name_escape(m->name);
|
|
if (!escaped)
|
|
return log_oom();
|
|
|
|
scope = strjoin("machine-", escaped, ".scope");
|
|
if (!scope)
|
|
return log_oom();
|
|
|
|
description = strjoina(m->class == MACHINE_VM ? "Virtual Machine " : "Container ", m->name);
|
|
|
|
r = manager_start_scope(m->manager, scope, m->leader, SPECIAL_MACHINE_SLICE, description, properties, error, &job);
|
|
if (r < 0) {
|
|
log_error("Failed to start machine scope: %s", bus_error_message(error, r));
|
|
free(scope);
|
|
return r;
|
|
} else {
|
|
m->unit = scope;
|
|
|
|
free(m->scope_job);
|
|
m->scope_job = job;
|
|
}
|
|
}
|
|
|
|
if (m->unit)
|
|
hashmap_put(m->manager->machine_units, m->unit, m);
|
|
|
|
return r;
|
|
}
|
|
|
|
int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (m->started)
|
|
return 0;
|
|
|
|
r = hashmap_put(m->manager->machine_leaders, PID_TO_PTR(m->leader), m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Create cgroup */
|
|
r = machine_start_scope(m, properties, error);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
log_struct(LOG_INFO,
|
|
"MESSAGE_ID=" SD_MESSAGE_MACHINE_START_STR,
|
|
"NAME=%s", m->name,
|
|
"LEADER="PID_FMT, m->leader,
|
|
LOG_MESSAGE("New machine %s.", m->name),
|
|
NULL);
|
|
|
|
if (!dual_timestamp_is_set(&m->timestamp))
|
|
dual_timestamp_get(&m->timestamp);
|
|
|
|
m->started = true;
|
|
|
|
/* Save new machine data */
|
|
machine_save(m);
|
|
|
|
machine_send_signal(m, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int machine_stop_scope(Machine *m) {
|
|
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
char *job = NULL;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(m->class != MACHINE_HOST);
|
|
|
|
if (!m->unit)
|
|
return 0;
|
|
|
|
r = manager_stop_unit(m->manager, m->unit, &error, &job);
|
|
if (r < 0) {
|
|
log_error("Failed to stop machine scope: %s", bus_error_message(&error, r));
|
|
return r;
|
|
}
|
|
|
|
free(m->scope_job);
|
|
m->scope_job = job;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int machine_stop(Machine *m) {
|
|
int r;
|
|
assert(m);
|
|
|
|
if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
|
|
return -EOPNOTSUPP;
|
|
|
|
r = machine_stop_scope(m);
|
|
|
|
m->stopping = true;
|
|
|
|
machine_save(m);
|
|
|
|
return r;
|
|
}
|
|
|
|
int machine_finalize(Machine *m) {
|
|
assert(m);
|
|
|
|
if (m->started)
|
|
log_struct(LOG_INFO,
|
|
"MESSAGE_ID=" SD_MESSAGE_MACHINE_STOP_STR,
|
|
"NAME=%s", m->name,
|
|
"LEADER="PID_FMT, m->leader,
|
|
LOG_MESSAGE("Machine %s terminated.", m->name),
|
|
NULL);
|
|
|
|
machine_unlink(m);
|
|
machine_add_to_gc_queue(m);
|
|
|
|
if (m->started) {
|
|
machine_send_signal(m, false);
|
|
m->started = false;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool machine_may_gc(Machine *m, bool drop_not_started) {
|
|
assert(m);
|
|
|
|
if (m->class == MACHINE_HOST)
|
|
return false;
|
|
|
|
if (drop_not_started && !m->started)
|
|
return true;
|
|
|
|
if (m->scope_job && manager_job_is_active(m->manager, m->scope_job))
|
|
return false;
|
|
|
|
if (m->unit && manager_unit_is_active(m->manager, m->unit))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void machine_add_to_gc_queue(Machine *m) {
|
|
assert(m);
|
|
|
|
if (m->in_gc_queue)
|
|
return;
|
|
|
|
LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m);
|
|
m->in_gc_queue = true;
|
|
}
|
|
|
|
MachineState machine_get_state(Machine *s) {
|
|
assert(s);
|
|
|
|
if (s->class == MACHINE_HOST)
|
|
return MACHINE_RUNNING;
|
|
|
|
if (s->stopping)
|
|
return MACHINE_CLOSING;
|
|
|
|
if (s->scope_job)
|
|
return MACHINE_OPENING;
|
|
|
|
return MACHINE_RUNNING;
|
|
}
|
|
|
|
int machine_kill(Machine *m, KillWho who, int signo) {
|
|
assert(m);
|
|
|
|
if (!IN_SET(m->class, MACHINE_VM, MACHINE_CONTAINER))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!m->unit)
|
|
return -ESRCH;
|
|
|
|
if (who == KILL_LEADER) {
|
|
/* If we shall simply kill the leader, do so directly */
|
|
|
|
if (kill(m->leader, signo) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Otherwise, make PID 1 do it for us, for the entire cgroup */
|
|
return manager_kill_unit(m->manager, m->unit, signo, NULL);
|
|
}
|
|
|
|
int machine_openpt(Machine *m, int flags) {
|
|
assert(m);
|
|
|
|
switch (m->class) {
|
|
|
|
case MACHINE_HOST: {
|
|
int fd;
|
|
|
|
fd = posix_openpt(flags);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
if (unlockpt(fd) < 0)
|
|
return -errno;
|
|
|
|
return fd;
|
|
}
|
|
|
|
case MACHINE_CONTAINER:
|
|
if (m->leader <= 0)
|
|
return -EINVAL;
|
|
|
|
return openpt_in_namespace(m->leader, flags);
|
|
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
int machine_open_terminal(Machine *m, const char *path, int mode) {
|
|
assert(m);
|
|
|
|
switch (m->class) {
|
|
|
|
case MACHINE_HOST:
|
|
return open_terminal(path, mode);
|
|
|
|
case MACHINE_CONTAINER:
|
|
if (m->leader <= 0)
|
|
return -EINVAL;
|
|
|
|
return open_terminal_in_namespace(m->leader, path, mode);
|
|
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
void machine_release_unit(Machine *m) {
|
|
assert(m);
|
|
|
|
if (!m->unit)
|
|
return;
|
|
|
|
(void) hashmap_remove(m->manager->machine_units, m->unit);
|
|
m->unit = mfree(m->unit);
|
|
}
|
|
|
|
int machine_get_uid_shift(Machine *m, uid_t *ret) {
|
|
char p[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(pid_t) + 1];
|
|
uid_t uid_base, uid_shift, uid_range;
|
|
gid_t gid_base, gid_shift, gid_range;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
int k;
|
|
|
|
assert(m);
|
|
assert(ret);
|
|
|
|
/* Return the base UID/GID of the specified machine. Note that this only works for containers with simple
|
|
* mappings. In most cases setups should be simple like this, and administrators should only care about the
|
|
* basic offset a container has relative to the host. This is what this function exposes.
|
|
*
|
|
* If we encounter any more complex mappings we politely refuse this with ENXIO. */
|
|
|
|
if (m->class == MACHINE_HOST) {
|
|
*ret = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (m->class != MACHINE_CONTAINER)
|
|
return -EOPNOTSUPP;
|
|
|
|
xsprintf(p, "/proc/" PID_FMT "/uid_map", m->leader);
|
|
f = fopen(p, "re");
|
|
if (!f) {
|
|
if (errno == ENOENT) {
|
|
/* If the file doesn't exist, user namespacing is off in the kernel, return a zero mapping hence. */
|
|
*ret = 0;
|
|
return 0;
|
|
}
|
|
|
|
return -errno;
|
|
}
|
|
|
|
/* Read the first line. There's at least one. */
|
|
errno = 0;
|
|
k = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT "\n", &uid_base, &uid_shift, &uid_range);
|
|
if (k != 3) {
|
|
if (ferror(f))
|
|
return -errno;
|
|
|
|
return -EBADMSG;
|
|
}
|
|
|
|
/* Not a mapping starting at 0? Then it's a complex mapping we can't expose here. */
|
|
if (uid_base != 0)
|
|
return -ENXIO;
|
|
/* Insist that at least the nobody user is mapped, everything else is weird, and hence complex, and we don't support it */
|
|
if (uid_range < UID_NOBODY)
|
|
return -ENXIO;
|
|
|
|
/* If there's more than one line, then we don't support this mapping. */
|
|
if (fgetc(f) != EOF)
|
|
return -ENXIO;
|
|
|
|
fclose(f);
|
|
|
|
xsprintf(p, "/proc/" PID_FMT "/gid_map", m->leader);
|
|
f = fopen(p, "re");
|
|
if (!f)
|
|
return -errno;
|
|
|
|
/* Read the first line. There's at least one. */
|
|
errno = 0;
|
|
k = fscanf(f, GID_FMT " " GID_FMT " " GID_FMT "\n", &gid_base, &gid_shift, &gid_range);
|
|
if (k != 3) {
|
|
if (ferror(f))
|
|
return -errno;
|
|
|
|
return -EBADMSG;
|
|
}
|
|
|
|
/* If there's more than one line, then we don't support this file. */
|
|
if (fgetc(f) != EOF)
|
|
return -ENXIO;
|
|
|
|
/* If the UID and GID mapping doesn't match, we don't support this mapping. */
|
|
if (uid_base != (uid_t) gid_base)
|
|
return -ENXIO;
|
|
if (uid_shift != (uid_t) gid_shift)
|
|
return -ENXIO;
|
|
if (uid_range != (uid_t) gid_range)
|
|
return -ENXIO;
|
|
|
|
*ret = uid_shift;
|
|
return 0;
|
|
}
|
|
|
|
static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
|
|
[MACHINE_CONTAINER] = "container",
|
|
[MACHINE_VM] = "vm",
|
|
[MACHINE_HOST] = "host",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);
|
|
|
|
static const char* const machine_state_table[_MACHINE_STATE_MAX] = {
|
|
[MACHINE_OPENING] = "opening",
|
|
[MACHINE_RUNNING] = "running",
|
|
[MACHINE_CLOSING] = "closing"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(machine_state, MachineState);
|
|
|
|
static const char* const kill_who_table[_KILL_WHO_MAX] = {
|
|
[KILL_LEADER] = "leader",
|
|
[KILL_ALL] = "all"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);
|