mirror of
https://github.com/systemd/systemd.git
synced 2024-11-12 15:21:19 +03:00
40ca29a137
Among other things this also adds a few things necessary for the change: - Considerably more powerful error returning APIs in libsystemd-bus - Adapter for connecting an sd_bus to an sd_event - As I reworked the PolicyKit logic to the new library I also made it asynchronous, so that PolicyKit requests of one user cannot block out another user anymore. - We always use the macro names for common bus error. That way it is harder to mistype them since the compiler will notice
1729 lines
62 KiB
C
1729 lines
62 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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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
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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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 <signal.h>
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#include <sched.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <sys/mount.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/prctl.h>
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#include <sys/capability.h>
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#include <getopt.h>
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#include <sys/poll.h>
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#include <sys/epoll.h>
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#include <termios.h>
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#include <sys/signalfd.h>
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#include <grp.h>
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#include <linux/fs.h>
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#include <sys/un.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <systemd/sd-daemon.h>
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#include <systemd/sd-bus.h>
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#include "log.h"
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#include "util.h"
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#include "mkdir.h"
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#include "macro.h"
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#include "audit.h"
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#include "missing.h"
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#include "cgroup-util.h"
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#include "strv.h"
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#include "path-util.h"
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#include "loopback-setup.h"
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#include "sd-id128.h"
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#include "dev-setup.h"
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#include "fdset.h"
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#include "build.h"
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#include "fileio.h"
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#include "bus-util.h"
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#ifndef TTY_GID
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#define TTY_GID 5
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#endif
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typedef enum LinkJournal {
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LINK_NO,
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LINK_AUTO,
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LINK_HOST,
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LINK_GUEST
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} LinkJournal;
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static char *arg_directory = NULL;
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static char *arg_user = NULL;
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static sd_id128_t arg_uuid = {};
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static char *arg_machine = NULL;
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static const char *arg_slice = NULL;
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static bool arg_private_network = false;
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static bool arg_read_only = false;
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static bool arg_boot = false;
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static LinkJournal arg_link_journal = LINK_AUTO;
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static uint64_t arg_retain =
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(1ULL << CAP_CHOWN) |
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(1ULL << CAP_DAC_OVERRIDE) |
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(1ULL << CAP_DAC_READ_SEARCH) |
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(1ULL << CAP_FOWNER) |
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(1ULL << CAP_FSETID) |
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(1ULL << CAP_IPC_OWNER) |
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(1ULL << CAP_KILL) |
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(1ULL << CAP_LEASE) |
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(1ULL << CAP_LINUX_IMMUTABLE) |
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(1ULL << CAP_NET_BIND_SERVICE) |
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(1ULL << CAP_NET_BROADCAST) |
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(1ULL << CAP_NET_RAW) |
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(1ULL << CAP_SETGID) |
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(1ULL << CAP_SETFCAP) |
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(1ULL << CAP_SETPCAP) |
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(1ULL << CAP_SETUID) |
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(1ULL << CAP_SYS_ADMIN) |
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(1ULL << CAP_SYS_CHROOT) |
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(1ULL << CAP_SYS_NICE) |
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(1ULL << CAP_SYS_PTRACE) |
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(1ULL << CAP_SYS_TTY_CONFIG) |
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(1ULL << CAP_SYS_RESOURCE) |
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(1ULL << CAP_SYS_BOOT) |
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(1ULL << CAP_AUDIT_WRITE) |
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(1ULL << CAP_AUDIT_CONTROL);
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static char **arg_bind = NULL;
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static char **arg_bind_ro = NULL;
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static int help(void) {
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printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
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"Spawn a minimal namespace container for debugging, testing and building.\n\n"
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" -h --help Show this help\n"
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" --version Print version string\n"
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" -D --directory=NAME Root directory for the container\n"
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" -b --boot Boot up full system (i.e. invoke init)\n"
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" -u --user=USER Run the command under specified user or uid\n"
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" --uuid=UUID Set a specific machine UUID for the container\n"
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" -M --machine=NAME Set the machine name for the container\n"
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" -S --slice=SLICE Place the container in the specified slice\n"
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" --private-network Disable network in container\n"
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" --read-only Mount the root directory read-only\n"
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" --capability=CAP In addition to the default, retain specified\n"
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" capability\n"
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" --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
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" -j Equivalent to --link-journal=host\n"
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" --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"
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" the container\n"
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" --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_PRIVATE_NETWORK,
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ARG_UUID,
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ARG_READ_ONLY,
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ARG_CAPABILITY,
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ARG_LINK_JOURNAL,
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ARG_BIND,
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ARG_BIND_RO
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "directory", required_argument, NULL, 'D' },
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{ "user", required_argument, NULL, 'u' },
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{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
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{ "boot", no_argument, NULL, 'b' },
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{ "uuid", required_argument, NULL, ARG_UUID },
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{ "read-only", no_argument, NULL, ARG_READ_ONLY },
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{ "capability", required_argument, NULL, ARG_CAPABILITY },
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{ "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
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{ "bind", required_argument, NULL, ARG_BIND },
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{ "bind-ro", required_argument, NULL, ARG_BIND_RO },
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{ "machine", required_argument, NULL, 'M' },
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{ "slice", required_argument, NULL, 'S' },
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{ NULL, 0, NULL, 0 }
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};
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int c, r;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "+hD:u:bM:jS:", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case 'D':
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free(arg_directory);
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arg_directory = canonicalize_file_name(optarg);
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if (!arg_directory) {
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log_error("Failed to canonicalize root directory.");
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return -ENOMEM;
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}
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break;
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case 'u':
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free(arg_user);
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arg_user = strdup(optarg);
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if (!arg_user)
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return log_oom();
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break;
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case ARG_PRIVATE_NETWORK:
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arg_private_network = true;
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break;
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case 'b':
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arg_boot = true;
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break;
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case ARG_UUID:
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r = sd_id128_from_string(optarg, &arg_uuid);
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if (r < 0) {
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log_error("Invalid UUID: %s", optarg);
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return r;
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}
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break;
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case 'S':
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arg_slice = strdup(optarg);
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break;
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case 'M':
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if (!hostname_is_valid(optarg)) {
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log_error("Invalid machine name: %s", optarg);
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return -EINVAL;
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}
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free(arg_machine);
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arg_machine = strdup(optarg);
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if (!arg_machine)
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return log_oom();
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break;
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case ARG_READ_ONLY:
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arg_read_only = true;
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break;
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case ARG_CAPABILITY: {
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char *state, *word;
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size_t length;
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FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
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cap_value_t cap;
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char *t;
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t = strndup(word, length);
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if (!t)
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return log_oom();
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if (cap_from_name(t, &cap) < 0) {
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log_error("Failed to parse capability %s.", t);
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free(t);
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return -EINVAL;
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}
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free(t);
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arg_retain |= 1ULL << (uint64_t) cap;
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}
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break;
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}
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case 'j':
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arg_link_journal = LINK_GUEST;
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break;
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case ARG_LINK_JOURNAL:
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if (streq(optarg, "auto"))
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arg_link_journal = LINK_AUTO;
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else if (streq(optarg, "no"))
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arg_link_journal = LINK_NO;
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else if (streq(optarg, "guest"))
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arg_link_journal = LINK_GUEST;
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else if (streq(optarg, "host"))
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arg_link_journal = LINK_HOST;
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else {
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log_error("Failed to parse link journal mode %s", optarg);
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return -EINVAL;
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}
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break;
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case ARG_BIND:
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case ARG_BIND_RO: {
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_cleanup_free_ char *a = NULL, *b = NULL;
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char *e;
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char ***x;
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x = c == ARG_BIND ? &arg_bind : &arg_bind_ro;
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e = strchr(optarg, ':');
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if (e) {
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a = strndup(optarg, e - optarg);
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b = strdup(e + 1);
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} else {
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a = strdup(optarg);
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b = strdup(optarg);
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}
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if (!a || !b)
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return log_oom();
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if (!path_is_absolute(a) || !path_is_absolute(b)) {
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log_error("Invalid bind mount specification: %s", optarg);
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return -EINVAL;
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}
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r = strv_extend(x, a);
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if (r < 0)
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return r;
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r = strv_extend(x, b);
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if (r < 0)
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return r;
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break;
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}
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case '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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}
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return 1;
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}
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static int mount_all(const char *dest) {
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typedef struct MountPoint {
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const char *what;
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const char *where;
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const char *type;
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const char *options;
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unsigned long flags;
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bool fatal;
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} MountPoint;
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static const MountPoint mount_table[] = {
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{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
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{ "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true }, /* Bind mount first */
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{ NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */
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{ "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
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{ "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },
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{ "devpts", "/dev/pts", "devpts","newinstance,ptmxmode=0666,mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, true },
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{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
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{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
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#ifdef HAVE_SELINUX
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{ "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false }, /* Bind mount first */
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{ NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */
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#endif
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};
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unsigned k;
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int r = 0;
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for (k = 0; k < ELEMENTSOF(mount_table); k++) {
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_cleanup_free_ char *where = NULL;
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int t;
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where = strjoin(dest, "/", mount_table[k].where, NULL);
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if (!where)
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return log_oom();
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t = path_is_mount_point(where, true);
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if (t < 0) {
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log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t));
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if (r == 0)
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r = t;
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continue;
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}
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/* Skip this entry if it is not a remount. */
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if (mount_table[k].what && t > 0)
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continue;
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mkdir_p(where, 0755);
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if (mount(mount_table[k].what,
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where,
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mount_table[k].type,
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mount_table[k].flags,
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mount_table[k].options) < 0 &&
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mount_table[k].fatal) {
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log_error("mount(%s) failed: %m", where);
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if (r == 0)
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r = -errno;
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}
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}
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return r;
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}
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static int mount_binds(const char *dest, char **l, unsigned long flags) {
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char **x, **y;
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STRV_FOREACH_PAIR(x, y, l) {
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_cleanup_free_ char *where = NULL;
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struct stat source_st, dest_st;
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if (stat(*x, &source_st) < 0) {
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log_error("failed to stat %s: %m", *x);
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return -errno;
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}
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where = strjoin(dest, "/", *y, NULL);
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if (!where)
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return log_oom();
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if (stat(where, &dest_st) == 0) {
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if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) {
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log_error("The file types of %s and %s do not match. Refusing bind mount",
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*x, where);
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return -EINVAL;
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}
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} else {
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/* Create the mount point, but be conservative -- refuse to create block
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* and char devices. */
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if (S_ISDIR(source_st.st_mode))
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mkdir_p_label(where, 0755);
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else if (S_ISFIFO(source_st.st_mode))
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mkfifo(where, 0644);
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else if (S_ISSOCK(source_st.st_mode))
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mknod(where, 0644 | S_IFSOCK, 0);
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else if (S_ISREG(source_st.st_mode))
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touch(where);
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else {
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log_error("Refusing to create mountpoint for file: %s", *x);
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return -ENOTSUP;
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}
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}
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|
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if (mount(*x, where, "bind", MS_BIND, NULL) < 0) {
|
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log_error("mount(%s) failed: %m", where);
|
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return -errno;
|
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}
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|
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if (flags && mount(NULL, where, NULL, MS_REMOUNT|MS_BIND|flags, NULL) < 0) {
|
|
log_error("mount(%s) failed: %m", where);
|
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return -errno;
|
|
}
|
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}
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|
|
return 0;
|
|
}
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|
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static int setup_timezone(const char *dest) {
|
|
_cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL;
|
|
char *z, *y;
|
|
int r;
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|
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assert(dest);
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|
|
|
/* Fix the timezone, if possible */
|
|
r = readlink_malloc("/etc/localtime", &p);
|
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if (r < 0) {
|
|
log_warning("/etc/localtime is not a symlink, not updating container timezone.");
|
|
return 0;
|
|
}
|
|
|
|
z = path_startswith(p, "../usr/share/zoneinfo/");
|
|
if (!z)
|
|
z = path_startswith(p, "/usr/share/zoneinfo/");
|
|
if (!z) {
|
|
log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
|
|
return 0;
|
|
}
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|
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where = strappend(dest, "/etc/localtime");
|
|
if (!where)
|
|
return log_oom();
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|
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r = readlink_malloc(where, &q);
|
|
if (r >= 0) {
|
|
y = path_startswith(q, "../usr/share/zoneinfo/");
|
|
if (!y)
|
|
y = path_startswith(q, "/usr/share/zoneinfo/");
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|
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/* Already pointing to the right place? Then do nothing .. */
|
|
if (y && streq(y, z))
|
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return 0;
|
|
}
|
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|
|
check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL);
|
|
if (!check)
|
|
return log_oom();
|
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|
|
if (access(check, F_OK) < 0) {
|
|
log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
|
|
return 0;
|
|
}
|
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|
|
what = strappend("../usr/share/zoneinfo/", z);
|
|
if (!what)
|
|
return log_oom();
|
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|
|
unlink(where);
|
|
if (symlink(what, where) < 0) {
|
|
log_error("Failed to correct timezone of container: %m");
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_resolv_conf(const char *dest) {
|
|
char _cleanup_free_ *where = NULL;
|
|
|
|
assert(dest);
|
|
|
|
if (arg_private_network)
|
|
return 0;
|
|
|
|
/* Fix resolv.conf, if possible */
|
|
where = strappend(dest, "/etc/resolv.conf");
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
/* We don't really care for the results of this really. If it
|
|
* fails, it fails, but meh... */
|
|
copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_boot_id(const char *dest) {
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
sd_id128_t rnd;
|
|
char as_uuid[37];
|
|
int r;
|
|
|
|
assert(dest);
|
|
|
|
/* Generate a new randomized boot ID, so that each boot-up of
|
|
* the container gets a new one */
|
|
|
|
from = strappend(dest, "/dev/proc-sys-kernel-random-boot-id");
|
|
to = strappend(dest, "/proc/sys/kernel/random/boot_id");
|
|
if (!from || !to)
|
|
return log_oom();
|
|
|
|
r = sd_id128_randomize(&rnd);
|
|
if (r < 0) {
|
|
log_error("Failed to generate random boot id: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
snprintf(as_uuid, sizeof(as_uuid),
|
|
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
|
|
SD_ID128_FORMAT_VAL(rnd));
|
|
char_array_0(as_uuid);
|
|
|
|
r = write_string_file(from, as_uuid);
|
|
if (r < 0) {
|
|
log_error("Failed to write boot id: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Failed to bind mount boot id: %m");
|
|
r = -errno;
|
|
} else if (mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL))
|
|
log_warning("Failed to make boot id read-only: %m");
|
|
|
|
unlink(from);
|
|
return r;
|
|
}
|
|
|
|
static int copy_devnodes(const char *dest) {
|
|
|
|
static const char devnodes[] =
|
|
"null\0"
|
|
"zero\0"
|
|
"full\0"
|
|
"random\0"
|
|
"urandom\0"
|
|
"tty\0";
|
|
|
|
const char *d;
|
|
int r = 0;
|
|
_cleanup_umask_ mode_t u;
|
|
|
|
assert(dest);
|
|
|
|
u = umask(0000);
|
|
|
|
NULSTR_FOREACH(d, devnodes) {
|
|
struct stat st;
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
|
|
asprintf(&from, "/dev/%s", d);
|
|
asprintf(&to, "%s/dev/%s", dest, d);
|
|
|
|
if (!from || !to) {
|
|
log_oom();
|
|
|
|
if (r == 0)
|
|
r = -ENOMEM;
|
|
|
|
break;
|
|
}
|
|
|
|
if (stat(from, &st) < 0) {
|
|
|
|
if (errno != ENOENT) {
|
|
log_error("Failed to stat %s: %m", from);
|
|
if (r == 0)
|
|
r = -errno;
|
|
}
|
|
|
|
} else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
|
|
|
|
log_error("%s is not a char or block device, cannot copy", from);
|
|
if (r == 0)
|
|
r = -EIO;
|
|
|
|
} else if (mknod(to, st.st_mode, st.st_rdev) < 0) {
|
|
|
|
log_error("mknod(%s) failed: %m", dest);
|
|
if (r == 0)
|
|
r = -errno;
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int setup_ptmx(const char *dest) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = strappend(dest, "/dev/ptmx");
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
if (symlink("pts/ptmx", p) < 0) {
|
|
log_error("Failed to create /dev/ptmx symlink: %m");
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_dev_console(const char *dest, const char *console) {
|
|
struct stat st;
|
|
_cleanup_free_ char *to = NULL;
|
|
int r;
|
|
_cleanup_umask_ mode_t u;
|
|
|
|
assert(dest);
|
|
assert(console);
|
|
|
|
u = umask(0000);
|
|
|
|
if (stat(console, &st) < 0) {
|
|
log_error("Failed to stat %s: %m", console);
|
|
return -errno;
|
|
|
|
} else if (!S_ISCHR(st.st_mode)) {
|
|
log_error("/dev/console is not a char device");
|
|
return -EIO;
|
|
}
|
|
|
|
r = chmod_and_chown(console, 0600, 0, 0);
|
|
if (r < 0) {
|
|
log_error("Failed to correct access mode for TTY: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (asprintf(&to, "%s/dev/console", dest) < 0)
|
|
return log_oom();
|
|
|
|
/* We need to bind mount the right tty to /dev/console since
|
|
* ptys can only exist on pts file systems. To have something
|
|
* to bind mount things on we create a device node first, that
|
|
* has the right major/minor (note that the major minor
|
|
* doesn't actually matter here, since we mount it over
|
|
* anyway). */
|
|
|
|
if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
|
|
log_error("mknod() for /dev/console failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
if (mount(console, to, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Bind mount for /dev/console failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_kmsg(const char *dest, int kmsg_socket) {
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
int r, fd, k;
|
|
_cleanup_umask_ mode_t u;
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(int))];
|
|
} control = {};
|
|
struct msghdr mh = {
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
|
|
assert(dest);
|
|
assert(kmsg_socket >= 0);
|
|
|
|
u = umask(0000);
|
|
|
|
/* We create the kmsg FIFO as /dev/kmsg, but immediately
|
|
* delete it after bind mounting it to /proc/kmsg. While FIFOs
|
|
* on the reading side behave very similar to /proc/kmsg,
|
|
* their writing side behaves differently from /dev/kmsg in
|
|
* that writing blocks when nothing is reading. In order to
|
|
* avoid any problems with containers deadlocking due to this
|
|
* we simply make /dev/kmsg unavailable to the container. */
|
|
if (asprintf(&from, "%s/dev/kmsg", dest) < 0 ||
|
|
asprintf(&to, "%s/proc/kmsg", dest) < 0)
|
|
return log_oom();
|
|
|
|
if (mkfifo(from, 0600) < 0) {
|
|
log_error("mkfifo() for /dev/kmsg failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
r = chmod_and_chown(from, 0600, 0, 0);
|
|
if (r < 0) {
|
|
log_error("Failed to correct access mode for /dev/kmsg: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Bind mount for /proc/kmsg failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
|
|
if (fd < 0) {
|
|
log_error("Failed to open fifo: %m");
|
|
return -errno;
|
|
}
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
|
|
|
|
mh.msg_controllen = cmsg->cmsg_len;
|
|
|
|
/* Store away the fd in the socket, so that it stays open as
|
|
* long as we run the child */
|
|
k = sendmsg(kmsg_socket, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
|
|
close_nointr_nofail(fd);
|
|
|
|
if (k < 0) {
|
|
log_error("Failed to send FIFO fd: %m");
|
|
return -errno;
|
|
}
|
|
|
|
/* And now make the FIFO unavailable as /dev/kmsg... */
|
|
unlink(from);
|
|
return 0;
|
|
}
|
|
|
|
static int setup_hostname(void) {
|
|
|
|
if (sethostname(arg_machine, strlen(arg_machine)) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_journal(const char *directory) {
|
|
sd_id128_t machine_id;
|
|
_cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL;
|
|
char *id;
|
|
int r;
|
|
|
|
if (arg_link_journal == LINK_NO)
|
|
return 0;
|
|
|
|
p = strappend(directory, "/etc/machine-id");
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
r = read_one_line_file(p, &b);
|
|
if (r == -ENOENT && arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
else if (r < 0) {
|
|
log_error("Failed to read machine ID from %s: %s", p, strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
id = strstrip(b);
|
|
if (isempty(id) && arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
|
|
/* Verify validity */
|
|
r = sd_id128_from_string(id, &machine_id);
|
|
if (r < 0) {
|
|
log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
free(p);
|
|
p = strappend("/var/log/journal/", id);
|
|
q = strjoin(directory, "/var/log/journal/", id, NULL);
|
|
if (!p || !q)
|
|
return log_oom();
|
|
|
|
if (path_is_mount_point(p, false) > 0) {
|
|
if (arg_link_journal != LINK_AUTO) {
|
|
log_error("%s: already a mount point, refusing to use for journal", p);
|
|
return -EEXIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (path_is_mount_point(q, false) > 0) {
|
|
if (arg_link_journal != LINK_AUTO) {
|
|
log_error("%s: already a mount point, refusing to use for journal", q);
|
|
return -EEXIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = readlink_and_make_absolute(p, &d);
|
|
if (r >= 0) {
|
|
if ((arg_link_journal == LINK_GUEST ||
|
|
arg_link_journal == LINK_AUTO) &&
|
|
path_equal(d, q)) {
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0)
|
|
log_warning("failed to create directory %s: %m", q);
|
|
return 0;
|
|
}
|
|
|
|
if (unlink(p) < 0) {
|
|
log_error("Failed to remove symlink %s: %m", p);
|
|
return -errno;
|
|
}
|
|
} else if (r == -EINVAL) {
|
|
|
|
if (arg_link_journal == LINK_GUEST &&
|
|
rmdir(p) < 0) {
|
|
|
|
if (errno == ENOTDIR) {
|
|
log_error("%s already exists and is neither a symlink nor a directory", p);
|
|
return r;
|
|
} else {
|
|
log_error("Failed to remove %s: %m", p);
|
|
return -errno;
|
|
}
|
|
}
|
|
} else if (r != -ENOENT) {
|
|
log_error("readlink(%s) failed: %m", p);
|
|
return r;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_GUEST) {
|
|
|
|
if (symlink(q, p) < 0) {
|
|
log_error("Failed to symlink %s to %s: %m", q, p);
|
|
return -errno;
|
|
}
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0)
|
|
log_warning("failed to create directory %s: %m", q);
|
|
return 0;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_HOST) {
|
|
r = mkdir_p(p, 0755);
|
|
if (r < 0) {
|
|
log_error("Failed to create %s: %m", p);
|
|
return r;
|
|
}
|
|
|
|
} else if (access(p, F_OK) < 0)
|
|
return 0;
|
|
|
|
if (dir_is_empty(q) == 0) {
|
|
log_error("%s not empty.", q);
|
|
return -ENOTEMPTY;
|
|
}
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0) {
|
|
log_error("Failed to create %s: %m", q);
|
|
return r;
|
|
}
|
|
|
|
if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Failed to bind mount journal from host into guest: %m");
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int drop_capabilities(void) {
|
|
return capability_bounding_set_drop(~arg_retain, false);
|
|
}
|
|
|
|
static int process_pty(int master, pid_t pid, sigset_t *mask) {
|
|
|
|
char in_buffer[LINE_MAX], out_buffer[LINE_MAX];
|
|
size_t in_buffer_full = 0, out_buffer_full = 0;
|
|
struct epoll_event stdin_ev, stdout_ev, master_ev, signal_ev;
|
|
bool stdin_readable = false, stdout_writable = false, master_readable = false, master_writable = false;
|
|
int ep = -1, signal_fd = -1, r;
|
|
bool tried_orderly_shutdown = false;
|
|
|
|
assert(master >= 0);
|
|
assert(pid > 0);
|
|
assert(mask);
|
|
|
|
fd_nonblock(STDIN_FILENO, 1);
|
|
fd_nonblock(STDOUT_FILENO, 1);
|
|
fd_nonblock(master, 1);
|
|
|
|
signal_fd = signalfd(-1, mask, SFD_NONBLOCK|SFD_CLOEXEC);
|
|
if (signal_fd < 0) {
|
|
log_error("signalfd(): %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
ep = epoll_create1(EPOLL_CLOEXEC);
|
|
if (ep < 0) {
|
|
log_error("Failed to create epoll: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
/* We read from STDIN only if this is actually a TTY,
|
|
* otherwise we assume non-interactivity. */
|
|
if (isatty(STDIN_FILENO)) {
|
|
zero(stdin_ev);
|
|
stdin_ev.events = EPOLLIN|EPOLLET;
|
|
stdin_ev.data.fd = STDIN_FILENO;
|
|
|
|
if (epoll_ctl(ep, EPOLL_CTL_ADD, STDIN_FILENO, &stdin_ev) < 0) {
|
|
log_error("Failed to register STDIN in epoll: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
zero(stdout_ev);
|
|
stdout_ev.events = EPOLLOUT|EPOLLET;
|
|
stdout_ev.data.fd = STDOUT_FILENO;
|
|
|
|
zero(master_ev);
|
|
master_ev.events = EPOLLIN|EPOLLOUT|EPOLLET;
|
|
master_ev.data.fd = master;
|
|
|
|
zero(signal_ev);
|
|
signal_ev.events = EPOLLIN;
|
|
signal_ev.data.fd = signal_fd;
|
|
|
|
if (epoll_ctl(ep, EPOLL_CTL_ADD, STDOUT_FILENO, &stdout_ev) < 0) {
|
|
if (errno != EPERM) {
|
|
log_error("Failed to register stdout in epoll: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
/* stdout without epoll support. Likely redirected to regular file. */
|
|
stdout_writable = true;
|
|
}
|
|
|
|
if (epoll_ctl(ep, EPOLL_CTL_ADD, master, &master_ev) < 0 ||
|
|
epoll_ctl(ep, EPOLL_CTL_ADD, signal_fd, &signal_ev) < 0) {
|
|
log_error("Failed to register fds in epoll: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
for (;;) {
|
|
struct epoll_event ev[16];
|
|
ssize_t k;
|
|
int i, nfds;
|
|
|
|
nfds = epoll_wait(ep, ev, ELEMENTSOF(ev), -1);
|
|
if (nfds < 0) {
|
|
|
|
if (errno == EINTR || errno == EAGAIN)
|
|
continue;
|
|
|
|
log_error("epoll_wait(): %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
assert(nfds >= 1);
|
|
|
|
for (i = 0; i < nfds; i++) {
|
|
if (ev[i].data.fd == STDIN_FILENO) {
|
|
|
|
if (ev[i].events & (EPOLLIN|EPOLLHUP))
|
|
stdin_readable = true;
|
|
|
|
} else if (ev[i].data.fd == STDOUT_FILENO) {
|
|
|
|
if (ev[i].events & (EPOLLOUT|EPOLLHUP))
|
|
stdout_writable = true;
|
|
|
|
} else if (ev[i].data.fd == master) {
|
|
|
|
if (ev[i].events & (EPOLLIN|EPOLLHUP))
|
|
master_readable = true;
|
|
|
|
if (ev[i].events & (EPOLLOUT|EPOLLHUP))
|
|
master_writable = true;
|
|
|
|
} else if (ev[i].data.fd == signal_fd) {
|
|
struct signalfd_siginfo sfsi;
|
|
ssize_t n;
|
|
|
|
n = read(signal_fd, &sfsi, sizeof(sfsi));
|
|
if (n != sizeof(sfsi)) {
|
|
|
|
if (n >= 0) {
|
|
log_error("Failed to read from signalfd: invalid block size");
|
|
r = -EIO;
|
|
goto finish;
|
|
}
|
|
|
|
if (errno != EINTR && errno != EAGAIN) {
|
|
log_error("Failed to read from signalfd: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
} else {
|
|
|
|
if (sfsi.ssi_signo == SIGWINCH) {
|
|
struct winsize ws;
|
|
|
|
/* The window size changed, let's forward that. */
|
|
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
|
|
ioctl(master, TIOCSWINSZ, &ws);
|
|
} else if (sfsi.ssi_signo == SIGTERM && arg_boot && !tried_orderly_shutdown) {
|
|
|
|
log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
|
|
|
|
/* This only works for systemd... */
|
|
tried_orderly_shutdown = true;
|
|
kill(pid, SIGRTMIN+3);
|
|
|
|
} else {
|
|
r = 0;
|
|
goto finish;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
while ((stdin_readable && in_buffer_full <= 0) ||
|
|
(master_writable && in_buffer_full > 0) ||
|
|
(master_readable && out_buffer_full <= 0) ||
|
|
(stdout_writable && out_buffer_full > 0)) {
|
|
|
|
if (stdin_readable && in_buffer_full < LINE_MAX) {
|
|
|
|
k = read(STDIN_FILENO, in_buffer + in_buffer_full, LINE_MAX - in_buffer_full);
|
|
if (k < 0) {
|
|
|
|
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
|
|
stdin_readable = false;
|
|
else {
|
|
log_error("read(): %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
} else
|
|
in_buffer_full += (size_t) k;
|
|
}
|
|
|
|
if (master_writable && in_buffer_full > 0) {
|
|
|
|
k = write(master, in_buffer, in_buffer_full);
|
|
if (k < 0) {
|
|
|
|
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
|
|
master_writable = false;
|
|
else {
|
|
log_error("write(): %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
} else {
|
|
assert(in_buffer_full >= (size_t) k);
|
|
memmove(in_buffer, in_buffer + k, in_buffer_full - k);
|
|
in_buffer_full -= k;
|
|
}
|
|
}
|
|
|
|
if (master_readable && out_buffer_full < LINE_MAX) {
|
|
|
|
k = read(master, out_buffer + out_buffer_full, LINE_MAX - out_buffer_full);
|
|
if (k < 0) {
|
|
|
|
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
|
|
master_readable = false;
|
|
else {
|
|
log_error("read(): %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
} else
|
|
out_buffer_full += (size_t) k;
|
|
}
|
|
|
|
if (stdout_writable && out_buffer_full > 0) {
|
|
|
|
k = write(STDOUT_FILENO, out_buffer, out_buffer_full);
|
|
if (k < 0) {
|
|
|
|
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
|
|
stdout_writable = false;
|
|
else {
|
|
log_error("write(): %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
} else {
|
|
assert(out_buffer_full >= (size_t) k);
|
|
memmove(out_buffer, out_buffer + k, out_buffer_full - k);
|
|
out_buffer_full -= k;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
finish:
|
|
if (ep >= 0)
|
|
close_nointr_nofail(ep);
|
|
|
|
if (signal_fd >= 0)
|
|
close_nointr_nofail(signal_fd);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int register_machine(void) {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_bus_unref_ sd_bus *bus = NULL;
|
|
int r;
|
|
|
|
r = sd_bus_open_system(&bus);
|
|
if (r < 0) {
|
|
log_error("Failed to open system bus: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"CreateMachine",
|
|
&error,
|
|
NULL,
|
|
"sayssusa(sv)",
|
|
arg_machine,
|
|
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
|
|
"nspawn",
|
|
"container",
|
|
(uint32_t) 0,
|
|
strempty(arg_directory),
|
|
1, "Slice", "s", strempty(arg_slice));
|
|
if (r < 0) {
|
|
log_error("Failed to register machine: %s", error.message ? error.message : strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool audit_enabled(void) {
|
|
int fd;
|
|
|
|
fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_AUDIT);
|
|
if (fd >= 0) {
|
|
close_nointr_nofail(fd);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
pid_t pid = 0;
|
|
int r = EXIT_FAILURE, k;
|
|
_cleanup_close_ int master = -1;
|
|
int n_fd_passed;
|
|
const char *console = NULL;
|
|
struct termios saved_attr, raw_attr;
|
|
sigset_t mask;
|
|
bool saved_attr_valid = false;
|
|
struct winsize ws;
|
|
int kmsg_socket_pair[2] = { -1, -1 };
|
|
_cleanup_fdset_free_ FDSet *fds = NULL;
|
|
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
k = parse_argv(argc, argv);
|
|
if (k < 0)
|
|
goto finish;
|
|
else if (k == 0) {
|
|
r = EXIT_SUCCESS;
|
|
goto finish;
|
|
}
|
|
|
|
if (arg_directory) {
|
|
char *p;
|
|
|
|
p = path_make_absolute_cwd(arg_directory);
|
|
free(arg_directory);
|
|
arg_directory = p;
|
|
} else
|
|
arg_directory = get_current_dir_name();
|
|
|
|
if (!arg_directory) {
|
|
log_error("Failed to determine path, please use -D.");
|
|
goto finish;
|
|
}
|
|
|
|
path_kill_slashes(arg_directory);
|
|
|
|
if (!arg_machine) {
|
|
arg_machine = strdup(path_get_file_name(arg_directory));
|
|
if (!arg_machine) {
|
|
log_oom();
|
|
goto finish;
|
|
}
|
|
|
|
hostname_cleanup(arg_machine, false);
|
|
if (isempty(arg_machine)) {
|
|
log_error("Failed to determine machine name automatically, please use -M.");
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
if (geteuid() != 0) {
|
|
log_error("Need to be root.");
|
|
goto finish;
|
|
}
|
|
|
|
if (sd_booted() <= 0) {
|
|
log_error("Not running on a systemd system.");
|
|
goto finish;
|
|
}
|
|
|
|
if (arg_boot && audit_enabled()) {
|
|
log_warning("The kernel auditing subsystem is known to be incompatible with containers.\n"
|
|
"Please make sure to turn off auditing with 'audit=0' on the kernel command\n"
|
|
"line before using systemd-nspawn. Sleeping for 5s...\n");
|
|
sleep(5);
|
|
}
|
|
|
|
if (path_equal(arg_directory, "/")) {
|
|
log_error("Spawning container on root directory not supported.");
|
|
goto finish;
|
|
}
|
|
|
|
if (path_is_os_tree(arg_directory) <= 0) {
|
|
log_error("Directory %s doesn't look like an OS root directory (/etc/os-release is missing). Refusing.", arg_directory);
|
|
goto finish;
|
|
}
|
|
|
|
log_close();
|
|
n_fd_passed = sd_listen_fds(false);
|
|
if (n_fd_passed > 0) {
|
|
k = fdset_new_listen_fds(&fds, false);
|
|
if (k < 0) {
|
|
log_error("Failed to collect file descriptors: %s", strerror(-k));
|
|
goto finish;
|
|
}
|
|
}
|
|
fdset_close_others(fds);
|
|
log_open();
|
|
|
|
master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
|
|
if (master < 0) {
|
|
log_error("Failed to acquire pseudo tty: %m");
|
|
goto finish;
|
|
}
|
|
|
|
console = ptsname(master);
|
|
if (!console) {
|
|
log_error("Failed to determine tty name: %m");
|
|
goto finish;
|
|
}
|
|
|
|
log_info("Spawning namespace container on %s (console is %s).", arg_directory, console);
|
|
|
|
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
|
|
ioctl(master, TIOCSWINSZ, &ws);
|
|
|
|
if (unlockpt(master) < 0) {
|
|
log_error("Failed to unlock tty: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (tcgetattr(STDIN_FILENO, &saved_attr) >= 0) {
|
|
saved_attr_valid = true;
|
|
|
|
raw_attr = saved_attr;
|
|
cfmakeraw(&raw_attr);
|
|
raw_attr.c_lflag &= ~ECHO;
|
|
}
|
|
|
|
if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
|
|
log_error("Failed to create kmsg socket pair.");
|
|
goto finish;
|
|
}
|
|
|
|
sd_notify(0, "READY=1");
|
|
|
|
assert_se(sigemptyset(&mask) == 0);
|
|
sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
|
|
assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
|
|
|
|
for (;;) {
|
|
siginfo_t status;
|
|
int pipefd[2], pipefd2[2];
|
|
|
|
if (pipe2(pipefd, O_NONBLOCK|O_CLOEXEC) < 0) {
|
|
log_error("pipe2(): %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (pipe2(pipefd2, O_NONBLOCK|O_CLOEXEC) < 0) {
|
|
log_error("pipe2(): %m");
|
|
close_pipe(pipefd);
|
|
goto finish;
|
|
}
|
|
|
|
pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS|(arg_private_network ? CLONE_NEWNET : 0), NULL);
|
|
if (pid < 0) {
|
|
if (errno == EINVAL)
|
|
log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
|
|
else
|
|
log_error("clone() failed: %m");
|
|
|
|
goto finish;
|
|
}
|
|
|
|
if (pid == 0) {
|
|
/* child */
|
|
const char *home = NULL;
|
|
uid_t uid = (uid_t) -1;
|
|
gid_t gid = (gid_t) -1;
|
|
unsigned n_env = 2;
|
|
const char *envp[] = {
|
|
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
|
|
"container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
|
|
NULL, /* TERM */
|
|
NULL, /* HOME */
|
|
NULL, /* USER */
|
|
NULL, /* LOGNAME */
|
|
NULL, /* container_uuid */
|
|
NULL, /* LISTEN_FDS */
|
|
NULL, /* LISTEN_PID */
|
|
NULL
|
|
};
|
|
|
|
envp[n_env] = strv_find_prefix(environ, "TERM=");
|
|
if (envp[n_env])
|
|
n_env ++;
|
|
|
|
/* Wait for the parent process to log our PID */
|
|
close_nointr_nofail(pipefd[1]);
|
|
fd_wait_for_event(pipefd[0], POLLHUP, -1);
|
|
close_nointr_nofail(pipefd[0]);
|
|
|
|
close_nointr_nofail(master);
|
|
master = -1;
|
|
|
|
if (saved_attr_valid) {
|
|
if (tcsetattr(STDIN_FILENO, TCSANOW, &raw_attr) < 0) {
|
|
log_error("Failed to set terminal attributes: %m");
|
|
goto child_fail;
|
|
}
|
|
}
|
|
|
|
close_nointr(STDIN_FILENO);
|
|
close_nointr(STDOUT_FILENO);
|
|
close_nointr(STDERR_FILENO);
|
|
|
|
close_nointr_nofail(kmsg_socket_pair[0]);
|
|
kmsg_socket_pair[0] = -1;
|
|
|
|
reset_all_signal_handlers();
|
|
|
|
assert_se(sigemptyset(&mask) == 0);
|
|
assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
|
|
|
|
k = open_terminal(console, O_RDWR);
|
|
if (k != STDIN_FILENO) {
|
|
if (k >= 0) {
|
|
close_nointr_nofail(k);
|
|
k = -EINVAL;
|
|
}
|
|
|
|
log_error("Failed to open console: %s", strerror(-k));
|
|
goto child_fail;
|
|
}
|
|
|
|
if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
|
|
dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
|
|
log_error("Failed to duplicate console: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setsid() < 0) {
|
|
log_error("setsid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
|
|
log_error("PR_SET_PDEATHSIG failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
close_pipe(pipefd2);
|
|
|
|
r = register_machine();
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
/* Mark everything as slave, so that we still
|
|
* receive mounts from the real root, but don't
|
|
* propagate mounts to the real root. */
|
|
if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
|
|
log_error("MS_SLAVE|MS_REC failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
/* Turn directory into bind mount */
|
|
if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REC, NULL) < 0) {
|
|
log_error("Failed to make bind mount.");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (arg_read_only)
|
|
if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY|MS_REC, NULL) < 0) {
|
|
log_error("Failed to make read-only.");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mount_all(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (copy_devnodes(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_ptmx(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
dev_setup(arg_directory);
|
|
|
|
if (setup_dev_console(arg_directory, console) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0)
|
|
goto child_fail;
|
|
|
|
close_nointr_nofail(kmsg_socket_pair[1]);
|
|
kmsg_socket_pair[1] = -1;
|
|
|
|
if (setup_boot_id(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_timezone(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_resolv_conf(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_journal(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (mount_binds(arg_directory, arg_bind, 0) < 0)
|
|
goto child_fail;
|
|
|
|
if (mount_binds(arg_directory, arg_bind_ro, MS_RDONLY) < 0)
|
|
goto child_fail;
|
|
|
|
if (chdir(arg_directory) < 0) {
|
|
log_error("chdir(%s) failed: %m", arg_directory);
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) {
|
|
log_error("mount(MS_MOVE) failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (chroot(".") < 0) {
|
|
log_error("chroot() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (chdir("/") < 0) {
|
|
log_error("chdir() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
umask(0022);
|
|
|
|
loopback_setup();
|
|
|
|
if (drop_capabilities() < 0) {
|
|
log_error("drop_capabilities() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (arg_user) {
|
|
|
|
/* Note that this resolves user names
|
|
* inside the container, and hence
|
|
* accesses the NSS modules from the
|
|
* container and not the host. This is
|
|
* a bit weird... */
|
|
|
|
if (get_user_creds((const char**)&arg_user, &uid, &gid, &home, NULL) < 0) {
|
|
log_error("get_user_creds() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mkdir_parents_label(home, 0775) < 0) {
|
|
log_error("mkdir_parents_label() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mkdir_safe_label(home, 0775, uid, gid) < 0) {
|
|
log_error("mkdir_safe_label() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (initgroups((const char*)arg_user, gid) < 0) {
|
|
log_error("initgroups() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresgid(gid, gid, gid) < 0) {
|
|
log_error("setregid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresuid(uid, uid, uid) < 0) {
|
|
log_error("setreuid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
} else {
|
|
/* Reset everything fully to 0, just in case */
|
|
|
|
if (setgroups(0, NULL) < 0) {
|
|
log_error("setgroups() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresgid(0, 0, 0) < 0) {
|
|
log_error("setregid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresuid(0, 0, 0) < 0) {
|
|
log_error("setreuid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
}
|
|
|
|
if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
|
|
(asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
|
|
(asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) {
|
|
log_oom();
|
|
goto child_fail;
|
|
}
|
|
|
|
if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) {
|
|
if (asprintf((char**)(envp + n_env++), "container_uuid=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid)) < 0) {
|
|
log_oom();
|
|
goto child_fail;
|
|
}
|
|
}
|
|
|
|
if (fdset_size(fds) > 0) {
|
|
k = fdset_cloexec(fds, false);
|
|
if (k < 0) {
|
|
log_error("Failed to unset O_CLOEXEC for file descriptors.");
|
|
goto child_fail;
|
|
}
|
|
|
|
if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) ||
|
|
(asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) {
|
|
log_oom();
|
|
goto child_fail;
|
|
}
|
|
}
|
|
|
|
setup_hostname();
|
|
|
|
if (arg_boot) {
|
|
char **a;
|
|
size_t l;
|
|
|
|
/* Automatically search for the init system */
|
|
|
|
l = 1 + argc - optind;
|
|
a = newa(char*, l + 1);
|
|
memcpy(a + 1, argv + optind, l * sizeof(char*));
|
|
|
|
a[0] = (char*) "/usr/lib/systemd/systemd";
|
|
execve(a[0], a, (char**) envp);
|
|
|
|
a[0] = (char*) "/lib/systemd/systemd";
|
|
execve(a[0], a, (char**) envp);
|
|
|
|
a[0] = (char*) "/sbin/init";
|
|
execve(a[0], a, (char**) envp);
|
|
} else if (argc > optind)
|
|
execvpe(argv[optind], argv + optind, (char**) envp);
|
|
else {
|
|
chdir(home ? home : "/root");
|
|
execle("/bin/bash", "-bash", NULL, (char**) envp);
|
|
}
|
|
|
|
log_error("execv() failed: %m");
|
|
|
|
child_fail:
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
log_info("Init process in the container running as PID %lu.", (unsigned long) pid);
|
|
close_nointr_nofail(pipefd[0]);
|
|
close_nointr_nofail(pipefd[1]);
|
|
|
|
/* Wait for the child process to establish cgroup hierarchy */
|
|
close_nointr_nofail(pipefd2[1]);
|
|
fd_wait_for_event(pipefd2[0], POLLHUP, -1);
|
|
close_nointr_nofail(pipefd2[0]);
|
|
|
|
fdset_free(fds);
|
|
fds = NULL;
|
|
|
|
if (process_pty(master, pid, &mask) < 0)
|
|
goto finish;
|
|
|
|
if (saved_attr_valid)
|
|
tcsetattr(STDIN_FILENO, TCSANOW, &saved_attr);
|
|
|
|
k = wait_for_terminate(pid, &status);
|
|
if (k < 0) {
|
|
r = EXIT_FAILURE;
|
|
break;
|
|
}
|
|
|
|
if (status.si_code == CLD_EXITED) {
|
|
r = status.si_status;
|
|
if (status.si_status != 0) {
|
|
log_error("Container failed with error code %i.", status.si_status);
|
|
break;
|
|
}
|
|
|
|
log_debug("Container exited successfully.");
|
|
break;
|
|
} else if (status.si_code == CLD_KILLED &&
|
|
status.si_status == SIGINT) {
|
|
log_info("Container has been shut down.");
|
|
r = 0;
|
|
break;
|
|
} else if (status.si_code == CLD_KILLED &&
|
|
status.si_status == SIGHUP) {
|
|
log_info("Container is being rebooted.");
|
|
continue;
|
|
} else if (status.si_code == CLD_KILLED ||
|
|
status.si_code == CLD_DUMPED) {
|
|
|
|
log_error("Container terminated by signal %s.", signal_to_string(status.si_status));
|
|
r = EXIT_FAILURE;
|
|
break;
|
|
} else {
|
|
log_error("Container failed due to unknown reason.");
|
|
r = EXIT_FAILURE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
finish:
|
|
if (saved_attr_valid)
|
|
tcsetattr(STDIN_FILENO, TCSANOW, &saved_attr);
|
|
|
|
close_pipe(kmsg_socket_pair);
|
|
|
|
if (pid > 0)
|
|
kill(pid, SIGKILL);
|
|
|
|
free(arg_directory);
|
|
free(arg_machine);
|
|
|
|
return r;
|
|
}
|