summaryrefslogtreecommitdiff
path: root/src/machine-id-setup/machine-id-setup-main.c
blob: 44fcdaae8194a7448f41c58596007cdf45deae44 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>

#include "alloc-util.h"
#include "dissect-image.h"
#include "id128-util.h"
#include "log.h"
#include "machine-id-setup.h"
#include "main-func.h"
#include "mount-util.h"
#include "parse-argument.h"
#include "path-util.h"
#include "pretty-print.h"
#include "terminal-util.h"
#include "util.h"

static char *arg_root = NULL;
static char *arg_image = NULL;
static bool arg_commit = false;
static bool arg_print = false;

STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image, freep);

static int help(void) {
        _cleanup_free_ char *link = NULL;
        int r;

        r = terminal_urlify_man("systemd-machine-id-setup", "1", &link);
        if (r < 0)
                return log_oom();

        printf("%s [OPTIONS...]\n"
               "\n%sInitialize /etc/machine-id from a random source.%s\n\n"
               "  -h --help             Show this help\n"
               "     --version          Show package version\n"
               "     --root=PATH        Operate relative to root path\n"
               "     --image=PATH       Operate relative to image file\n"
               "     --commit           Commit transient ID\n"
               "     --print            Print used machine ID\n"
               "\nSee the %s for details.\n",
               program_invocation_short_name,
               ansi_highlight(),
               ansi_normal(),
               link);

        return 0;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_VERSION = 0x100,
                ARG_ROOT,
                ARG_IMAGE,
                ARG_COMMIT,
                ARG_PRINT,
        };

        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     },
                { "commit",    no_argument,       NULL, ARG_COMMIT    },
                { "print",     no_argument,       NULL, ARG_PRINT     },
                {}
        };

        int c, r;

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)

                switch (c) {

                case 'h':
                        return help();

                case ARG_VERSION:
                        return version();

                case ARG_ROOT:
                        r = parse_path_argument(optarg, true, &arg_root);
                        if (r < 0)
                                return r;
                        break;

                case ARG_IMAGE:
                        r = parse_path_argument(optarg, false, &arg_image);
                        if (r < 0)
                                return r;
                        break;

                case ARG_COMMIT:
                        arg_commit = true;
                        break;

                case ARG_PRINT:
                        arg_print = true;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached();
                }

        if (optind < argc)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                       "Extraneous arguments");

        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[]) {
        _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;
        sd_id128_t id;
        int r;

        log_parse_environment();
        log_open();

        r = parse_argv(argc, argv);
        if (r <= 0)
                return r;

        if (arg_image) {
                assert(!arg_root);

                r = mount_image_privately_interactively(
                                arg_image,
                                DISSECT_IMAGE_REQUIRE_ROOT |
                                DISSECT_IMAGE_VALIDATE_OS |
                                DISSECT_IMAGE_RELAX_VAR_CHECK |
                                DISSECT_IMAGE_FSCK |
                                DISSECT_IMAGE_GROWFS,
                                &unlink_dir,
                                &loop_device,
                                &decrypted_image);
                if (r < 0)
                        return r;

                arg_root = strdup(unlink_dir);
                if (!arg_root)
                        return log_oom();
        }

        if (arg_commit) {
                const char *etc_machine_id;

                r = machine_id_commit(arg_root);
                if (r < 0)
                        return r;

                etc_machine_id = prefix_roota(arg_root, "/etc/machine-id");
                r = id128_read(etc_machine_id, ID128_PLAIN, &id);
                if (r < 0)
                        return log_error_errno(r, "Failed to read machine ID back: %m");
        } else {
                r = machine_id_setup(arg_root, false, SD_ID128_NULL, &id);
                if (r < 0)
                        return r;
        }

        if (arg_print)
                puts(SD_ID128_TO_STRING(id));

        return 0;
}

DEFINE_MAIN_FUNCTION(run);