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Merge pull request #16301 from poettering/firstboot-image

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Add --image= switch to firstboot, similar to --root= but with support for operating on disk image
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Zbigniew Jędrzejewski-Szmek 2020-07-07 19:44:12 +02:00 committed by GitHub
commit 2b0bf3ccf8
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10 changed files with 189 additions and 27 deletions
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8
TODO
View File

@ -49,6 +49,9 @@ Features:
* nspawn: support time namespaces
* systemd-firstboot: make sure to always use chase_symlinks() before
reading/writing files
* add ConditionSecurity=tpm2
* Remove any support for booting without /usr pre-mounted in the initrd entirely.
@ -94,8 +97,9 @@ Features:
this, it's useful to have one that can dump contents of them, too.
* All tools that support --root= should also learn --image= so that they can
operate on disk images directly. Specifically: bootctl, firstboot, tmpfiles,
sysusers, systemctl, repart, journalctl, coredumpctl.
operate on disk images directly. Specifically: bootctl, tmpfiles, sysusers,
systemctl, repart, journalctl, coredumpctl. (Already done: systemd-nspawn,
systemd-firstboot)
* seccomp: by default mask x32 ABI system wide on x86-64. it's on its way out

20
man/systemd-firstboot.xml
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@ -98,6 +98,18 @@
</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--image=<replaceable>path</replaceable></option></term>
<listitem><para>Takes a path to a disk image file or block device node. If specified all operations
are applied to file system in the indicated disk image. This is similar to <option>--root=</option>
but operates on file systems stored in disk images or block devices. The disk image should either
contain just a file system or a set of file systems within a GPT partition table, following the
<ulink url="https://systemd.io/DISCOVERABLE_PARTITIONS">Discoverable Partitions
Specification</ulink>. For further information on supported disk images, see
<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
switch of the same name.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--locale=<replaceable>LOCALE</replaceable></option></term>
<term><option>--locale-messages=<replaceable>LOCALE</replaceable></option></term>
@ -247,6 +259,14 @@
option should not be used lightly.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--welcome=</option></term>
<listitem><para>Takes a boolean argument. By default when prompting the user for configuration
options a brief welcome text is shown before the first question is asked. Pass false to this option
to turn off the welcome text.</para></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>

14
src/basic/namespace-util.c
View File

@ -2,6 +2,7 @@
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include "fd-util.h"
#include "missing_fs.h"
@ -169,3 +170,16 @@ int fd_is_network_ns(int fd) {
return r == CLONE_NEWNET;
}
int detach_mount_namespace(void) {
/* Detaches the mount namespace, disabling propagation from our namespace to the host */
if (unshare(CLONE_NEWNS) < 0)
return -errno;
if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0)
return -errno;
return 0;
}

2
src/basic/namespace-util.h
View File

@ -7,3 +7,5 @@ int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *
int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd);
int fd_is_network_ns(int fd);
int detach_mount_namespace(void);

8
src/core/machine-id-setup.c
View File

@ -223,11 +223,9 @@ int machine_id_commit(const char *root) {
return log_error_errno(r, "Can't fetch current mount namespace: %m");
/* Switch to a new mount namespace, isolate ourself and unmount etc_machine_id in our new namespace */
if (unshare(CLONE_NEWNS) < 0)
return log_error_errno(errno, "Failed to enter new namespace: %m");
if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0)
return log_error_errno(errno, "Couldn't make-rslave / mountpoint in our private namespace: %m");
r = detach_mount_namespace();
if (r < 0)
return log_error_errno(r, "Failed to set up new mount namespace: %m");
if (umount(etc_machine_id) < 0)
return log_error_errno(errno, "Failed to unmount transient %s file in our private namespace: %m", etc_machine_id);

129
src/firstboot/firstboot.c
View File

@ -2,6 +2,7 @@
#include <fcntl.h>
#include <getopt.h>
#include <linux/loop.h>
#include <unistd.h>
#include "sd-id128.h"
@ -9,6 +10,7 @@
#include "alloc-util.h"
#include "ask-password-api.h"
#include "copy.h"
#include "dissect-image.h"
#include "env-file.h"
#include "fd-util.h"
#include "fileio.h"
@ -17,9 +19,12 @@
#include "kbd-util.h"
#include "libcrypt-util.h"
#include "locale-util.h"
#include "loop-util.h"
#include "main-func.h"
#include "memory-util.h"
#include "mkdir.h"
#include "mount-util.h"
#include "namespace-util.h"
#include "os-util.h"
#include "parse-util.h"
#include "path-util.h"
@ -31,10 +36,12 @@
#include "terminal-util.h"
#include "time-util.h"
#include "tmpfile-util-label.h"
#include "tmpfile-util.h"
#include "umask-util.h"
#include "user-util.h"
static char *arg_root = NULL;
static char *arg_image = NULL;
static char *arg_locale = NULL; /* $LANG */
static char *arg_keymap = NULL;
static char *arg_locale_messages = NULL; /* $LC_MESSAGES */
@ -55,8 +62,10 @@ static bool arg_copy_root_password = false;
static bool arg_force = false;
static bool arg_delete_root_password = false;
static bool arg_root_password_is_hashed = false;
static bool arg_welcome = true;
STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
STATIC_DESTRUCTOR_REGISTER(arg_locale, freep);
STATIC_DESTRUCTOR_REGISTER(arg_locale_messages, freep);
STATIC_DESTRUCTOR_REGISTER(arg_keymap, freep);
@ -85,6 +94,9 @@ static void print_welcome(void) {
const char *pn;
int r;
if (!arg_welcome)
return;
if (done)
return;
@ -826,6 +838,75 @@ static int process_kernel_cmdline(void) {
return 0;
}
static int setup_image(char **ret_mount_dir, LoopDevice **ret_loop_device, DecryptedImage **ret_decrypted_image) {
DissectImageFlags f = DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK;
_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
_cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
_cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
_cleanup_(rmdir_and_freep) char *mount_dir = NULL;
_cleanup_free_ char *temp = NULL;
int r;
if (!arg_image) {
*ret_mount_dir = NULL;
*ret_decrypted_image = NULL;
*ret_loop_device = NULL;
return 0;
}
assert(!arg_root);
r = tempfn_random_child(NULL, "firstboot", &temp);
if (r < 0)
return log_error_errno(r, "Failed to generate temporary mount directory: %m");
r = loop_device_make_by_path(arg_image, O_RDWR, LO_FLAGS_PARTSCAN, &d);
if (r < 0)
return log_error_errno(r, "Failed to set up loopback device: %m");
r = dissect_image_and_warn(d->fd, arg_image, NULL, 0, NULL, f, &dissected_image);
if (r < 0)
return r;
r = dissected_image_decrypt_interactively(dissected_image, NULL, NULL, 0, NULL, NULL, NULL, 0, f, &decrypted_image);
if (r < 0)
return r;
r = detach_mount_namespace();
if (r < 0)
return log_error_errno(r, "Failed to detach mount namespace: %m");
mount_dir = strdup(temp);
if (!mount_dir)
return log_oom();
r = mkdir_p(mount_dir, 0700);
if (r < 0) {
mount_dir = mfree(mount_dir);
return log_error_errno(r, "Failed to create mount point: %m");
}
r = dissected_image_mount(dissected_image, mount_dir, UID_INVALID, f);
if (r < 0)
return log_error_errno(r, "Failed to mount image: %m");
if (decrypted_image) {
r = decrypted_image_relinquish(decrypted_image);
if (r < 0)
return log_error_errno(r, "Failed to relinquish DM devices: %m");
}
loop_device_relinquish(d);
arg_root = TAKE_PTR(temp);
*ret_mount_dir = TAKE_PTR(mount_dir);
*ret_decrypted_image = TAKE_PTR(decrypted_image);
*ret_loop_device = TAKE_PTR(d);
return 1;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
@ -839,6 +920,7 @@ static int help(void) {
" -h --help Show this help\n"
" --version Show package version\n"
" --root=PATH Operate on an alternate filesystem root\n"
" --image=PATH Operate on an alternate filesystem image\n"
" --locale=LOCALE Set primary locale (LANG=)\n"
" --locale-messages=LOCALE Set message locale (LC_MESSAGES=)\n"
" --keymap=KEYMAP Set keymap\n"
@ -862,6 +944,7 @@ static int help(void) {
" --setup-machine-id Generate a new random machine ID\n"
" --force Overwrite existing files\n"
" --delete-root-password Delete root password\n"
" --welcome=no Disable the welcome text\n"
"\nSee the %s for details.\n"
, program_invocation_short_name
, link
@ -875,6 +958,7 @@ static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_ROOT,
ARG_IMAGE,
ARG_LOCALE,
ARG_LOCALE_MESSAGES,
ARG_KEYMAP,
@ -899,12 +983,14 @@ static int parse_argv(int argc, char *argv[]) {
ARG_SETUP_MACHINE_ID,
ARG_FORCE,
ARG_DELETE_ROOT_PASSWORD,
ARG_WELCOME,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "root", required_argument, NULL, ARG_ROOT },
{ "image", required_argument, NULL, ARG_IMAGE },
{ "locale", required_argument, NULL, ARG_LOCALE },
{ "locale-messages", required_argument, NULL, ARG_LOCALE_MESSAGES },
{ "keymap", required_argument, NULL, ARG_KEYMAP },
@ -929,6 +1015,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "setup-machine-id", no_argument, NULL, ARG_SETUP_MACHINE_ID },
{ "force", no_argument, NULL, ARG_FORCE },
{ "delete-root-password", no_argument, NULL, ARG_DELETE_ROOT_PASSWORD },
{ "welcome", required_argument, NULL, ARG_WELCOME },
{}
};
@ -953,6 +1040,12 @@ static int parse_argv(int argc, char *argv[]) {
return r;
break;
case ARG_IMAGE:
r = parse_path_argument_and_warn(optarg, false, &arg_image);
if (r < 0)
return r;
break;
case ARG_LOCALE:
r = free_and_strdup(&arg_locale, optarg);
if (r < 0)
@ -1086,7 +1179,6 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_SETUP_MACHINE_ID:
r = sd_id128_randomize(&arg_machine_id);
if (r < 0)
return log_error_errno(r, "Failed to generate randomized machine ID: %m");
@ -1101,6 +1193,14 @@ static int parse_argv(int argc, char *argv[]) {
arg_delete_root_password = true;
break;
case ARG_WELCOME:
r = parse_boolean(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse --welcome= argument: %s", optarg);
arg_welcome = r;
break;
case '?':
return -EINVAL;
@ -1120,11 +1220,16 @@ static int parse_argv(int argc, char *argv[]) {
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--delete-root-password cannot be combined with other root password options");
if (arg_image && arg_root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
return 1;
}
static int run(int argc, char *argv[]) {
bool enabled;
_cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
_cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
_cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
int r;
r = parse_argv(argc, argv);
@ -1135,11 +1240,23 @@ static int run(int argc, char *argv[]) {
umask(0022);
r = proc_cmdline_get_bool("systemd.firstboot", &enabled);
if (!arg_root && !arg_image) {
bool enabled;
/* If we are called without --root=/--image= let's honour the systemd.firstboot kernel
* command line option, because we are called to provision the host with basic settings (as
* opposed to some other file system tree/image) */
r = proc_cmdline_get_bool("systemd.firstboot", &enabled);
if (r < 0)
return log_error_errno(r, "Failed to parse systemd.firstboot= kernel command line argument, ignoring: %m");
if (r > 0 && !enabled)
return 0; /* disabled */
}
r = setup_image(&unlink_dir, &loop_device, &decrypted_image);
if (r < 0)
return log_error_errno(r, "Failed to parse systemd.firstboot= kernel command line argument, ignoring: %m");
if (r > 0 && !enabled)
return 0; /* disabled */
return r;
r = process_locale();
if (r < 0)

5
src/shared/mount-util.c
View File

@ -58,8 +58,8 @@ int umount_recursive(const char *prefix, int flags) {
if (!path_startswith(path, prefix))
continue;
if (umount2(path, flags) < 0) {
r = log_debug_errno(errno, "Failed to umount %s: %m", path);
if (umount2(path, flags | UMOUNT_NOFOLLOW) < 0) {
log_debug_errno(errno, "Failed to umount %s, ignoring: %m", path);
continue;
}
@ -70,7 +70,6 @@ int umount_recursive(const char *prefix, int flags) {
break;
}
} while (again);
return n;

11
src/shared/mount-util.h
View File

@ -3,7 +3,9 @@
#include <mntent.h>
#include <stdio.h>
#include <unistd.h>
#include "errno-util.h"
#include "macro.h"
/* 4MB for contents of regular files, 64k inodes for directories, symbolic links and device specials,
@ -53,3 +55,12 @@ int mount_option_mangle(
char **ret_remaining_options);
int mode_to_inaccessible_node(const char *runtime_dir, mode_t mode, char **dest);
/* Useful for usage with _cleanup_(), unmounts, removes a directory and frees the pointer */
static inline void umount_and_rmdir_and_free(char *p) {
PROTECT_ERRNO;
(void) umount_recursive(p, 0);
(void) rmdir(p);
free(p);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free);

6
src/shared/tests.c
View File

@ -21,6 +21,7 @@
#include "env-util.h"
#include "fs-util.h"
#include "log.h"
#include "namespace-util.h"
#include "path-util.h"
#include "random-util.h"
#include "strv.h"
@ -137,10 +138,7 @@ bool have_namespaces(void) {
if (pid == 0) {
/* child */
if (unshare(CLONE_NEWNS) < 0)
_exit(EXIT_FAILURE);
if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
if (detach_mount_namespace() < 0)
_exit(EXIT_FAILURE);
_exit(EXIT_SUCCESS);

13
src/test/test-udev.c
View File

@ -17,6 +17,7 @@
#include "log.h"
#include "main-func.h"
#include "mkdir.h"
#include "namespace-util.h"
#include "selinux-util.h"
#include "signal-util.h"
#include "string-util.h"
@ -36,15 +37,13 @@ static int fake_filesystems(void) {
{ "test/run", "/etc/udev/rules.d", "Failed to mount empty /etc/udev/rules.d", true },
{ "test/run", UDEVLIBEXECDIR "/rules.d", "Failed to mount empty " UDEVLIBEXECDIR "/rules.d", true },
};
unsigned i;
int r;
if (unshare(CLONE_NEWNS) < 0)
return log_error_errno(errno, "Failed to call unshare(): %m");
r = detach_mount_namespace();
if (r < 0)
return log_error_errno(r, "Failed to detach mount namespace: %m");
if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
return log_error_errno(errno, "Failed to mount / as private: %m");
for (i = 0; i < ELEMENTSOF(fakefss); i++)
for (size_t i = 0; i < ELEMENTSOF(fakefss); i++)
if (mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL) < 0) {
log_full_errno(fakefss[i].ignore_mount_error ? LOG_DEBUG : LOG_ERR, errno, "%s: %m", fakefss[i].error);
if (!fakefss[i].ignore_mount_error)