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kernel-install: Add --root, --image and --image-policy

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Currently only supported for the "inspect" verb as "add" and "remove"
require figuring out what to do with plugins.
This commit is contained in:
Daan De Meyer 2023-10-25 09:57:44 +02:00
parent 4ca7c94e16
commit 04a8c2ce30
2 changed files with 104 additions and 12 deletions
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27
man/kernel-install.xml
View File

@ -301,10 +301,37 @@
</listitem>
</varlistentry>
<varlistentry>
<term><option>--root=<replaceable>root</replaceable></option></term>
<listitem><para>Takes a directory path as an argument. All paths will be prefixed with the given
alternate <replaceable>root</replaceable> path, including config search paths. This is useful to
operate on a system image mounted to the specified directory instead of the host system
itself.</para>
<xi:include href="version-info.xml" xpointer="v255"/></listitem>
</varlistentry>
<varlistentry>
<term><option>--image=<replaceable>image</replaceable></option></term>
<listitem><para>Takes a path to a disk image file or block device node. If specified, all operations
are applied to the file system in the indicated disk image. This option 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://uapi-group.org/specifications/specs/discoverable_partitions_specification">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>
<xi:include href="version-info.xml" xpointer="v255"/></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
<xi:include href="standard-options.xml" xpointer="no-pager"/>
<xi:include href="standard-options.xml" xpointer="json" />
<xi:include href="standard-options.xml" xpointer="image-policy-open" />
</variablelist>
</refsect1>

73
src/kernel-install/kernel-install.c
View File

@ -15,9 +15,11 @@
#include "find-esp.h"
#include "format-table.h"
#include "id128-util.h"
#include "image-policy.h"
#include "kernel-image.h"
#include "main-func.h"
#include "mkdir.h"
#include "mount-util.h"
#include "parse-argument.h"
#include "path-util.h"
#include "pretty-print.h"
@ -35,9 +37,14 @@ static char *arg_xbootldr_path = NULL;
static int arg_make_entry_directory = -1; /* tristate */
static PagerFlags arg_pager_flags = 0;
static JsonFormatFlags arg_json_format_flags = JSON_FORMAT_OFF;
static char *arg_root = NULL;
static char *arg_image = NULL;
static ImagePolicy *arg_image_policy = NULL;
STATIC_DESTRUCTOR_REGISTER(arg_esp_path, freep);
STATIC_DESTRUCTOR_REGISTER(arg_xbootldr_path, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep);
typedef enum Action {
ACTION_ADD,
@ -117,9 +124,9 @@ static int context_open_root(Context *c) {
assert(c);
assert(c->rfd < 0);
c->rfd = open("/", O_CLOEXEC | O_DIRECTORY | O_PATH);
c->rfd = open(empty_to_root(arg_root), O_CLOEXEC | O_DIRECTORY | O_PATH);
if (c->rfd < 0)
return log_error_errno(errno, "Failed to open root directory: %m");
return log_error_errno(errno, "Failed to open root directory '%s': %m", empty_to_root(arg_root));
return 0;
}
@ -1019,6 +1026,9 @@ static int verb_add(int argc, char *argv[], void *userdata) {
assert(argc >= 3);
assert(argv);
if (arg_root)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "'add' does not support --root=.");
if (bypass())
return 0;
@ -1060,6 +1070,9 @@ static int verb_remove(int argc, char *argv[], void *userdata) {
assert(argc >= 2);
assert(argv);
if (arg_root)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "'remove' does not support --root=.");
if (argc > 2)
log_debug("Too many arguments specified. 'kernel-install remove' takes only kernel version. "
"Ignoring residual arguments.");
@ -1196,8 +1209,10 @@ static int help(void) {
" --entry-token=machine-id|os-id|os-image-id|auto|literal:…\n"
" Entry token to use for this installation\n"
" --no-pager Do not pipe inspect output into a pager\n"
" --json=pretty|short|off\n"
" Generate JSON output\n"
" --json=pretty|short|off Generate JSON output\n"
" --root=PATH Operate on an alternate filesystem root\n"
" --image=PATH Operate on disk image as filesystem root\n"
" --image-policy=POLICY Specify disk image dissection policy\n"
"\n"
"This program may also be invoked as 'installkernel':\n"
" installkernel [OPTIONS...] VERSION VMLINUZ [MAP] [INSTALLATION-DIR]\n"
@ -1221,6 +1236,9 @@ static int parse_argv(int argc, char *argv[], Context *c) {
ARG_ENTRY_TOKEN,
ARG_NO_PAGER,
ARG_JSON,
ARG_ROOT,
ARG_IMAGE,
ARG_IMAGE_POLICY,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
@ -1232,6 +1250,9 @@ static int parse_argv(int argc, char *argv[], Context *c) {
{ "entry-token", required_argument, NULL, ARG_ENTRY_TOKEN },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{ "json", required_argument, NULL, ARG_JSON },
{ "root", required_argument, NULL, ARG_ROOT },
{ "image", required_argument, NULL, ARG_IMAGE },
{ "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
{}
};
int t, r;
@ -1293,6 +1314,24 @@ static int parse_argv(int argc, char *argv[], Context *c) {
return r;
break;
case ARG_ROOT:
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
if (r < 0)
return r;
break;
case ARG_IMAGE:
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
if (r < 0)
return r;
break;
case ARG_IMAGE_POLICY:
r = parse_image_policy_argument(optarg, &arg_image_policy);
if (r < 0)
return r;
break;
case '?':
return -EINVAL;
@ -1300,6 +1339,9 @@ static int parse_argv(int argc, char *argv[], Context *c) {
assert_not_reached();
}
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;
}
@ -1317,6 +1359,8 @@ static int run(int argc, char* argv[]) {
.layout = _LAYOUT_INVALID,
.entry_token_type = BOOT_ENTRY_TOKEN_AUTO,
};
_cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
_cleanup_(umount_and_freep) char *mounted_dir = NULL;
int r;
log_setup();
@ -1325,6 +1369,27 @@ static int run(int argc, char* argv[]) {
if (r <= 0)
return r;
if (arg_image) {
assert(!arg_root);
r = mount_image_privately_interactively(
arg_image,
arg_image_policy,
DISSECT_IMAGE_GENERIC_ROOT |
DISSECT_IMAGE_REQUIRE_ROOT |
DISSECT_IMAGE_RELAX_VAR_CHECK |
DISSECT_IMAGE_VALIDATE_OS,
&mounted_dir,
/* ret_dir_fd= */ NULL,
&loop_device);
if (r < 0)
return r;
arg_root = strdup(mounted_dir);
if (!arg_root)
return log_oom();
}
r = context_init(&c);
if (r < 0)
return r;