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2a796654 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "log.h" | |
27 | #include "util.h" | |
28 | #include "unit-name.h" | |
5dc4c17f | 29 | #include "virt.h" |
2a796654 LP |
30 | |
31 | const char *arg_dest = "/tmp"; | |
32 | ||
33 | static int add_symlink(const char *fservice, const char *tservice) { | |
34 | char *from = NULL, *to = NULL; | |
35 | int r; | |
36 | ||
4dc380d1 LP |
37 | assert(fservice); |
38 | assert(tservice); | |
39 | ||
2a796654 LP |
40 | asprintf(&from, SYSTEM_DATA_UNIT_PATH "/%s", fservice); |
41 | asprintf(&to, "%s/getty.target.wants/%s", arg_dest, tservice); | |
42 | ||
43 | if (!from || !to) { | |
44 | log_error("Out of memory"); | |
45 | r = -ENOMEM; | |
46 | goto finish; | |
47 | } | |
48 | ||
49 | mkdir_parents(to, 0755); | |
50 | ||
a17b785b LP |
51 | r = symlink(from, to); |
52 | if (r < 0) { | |
53 | if (errno == EEXIST) | |
3c20189a | 54 | /* In case console=hvc0 is passed this will very likely result in EEXIST */ |
a17b785b LP |
55 | r = 0; |
56 | else { | |
57 | log_error("Failed to create symlink from %s to %s: %m", from, to); | |
58 | r = -errno; | |
59 | } | |
2a796654 LP |
60 | } |
61 | ||
62 | finish: | |
63 | ||
64 | free(from); | |
65 | free(to); | |
66 | ||
67 | return r; | |
68 | } | |
69 | ||
4dc380d1 LP |
70 | static int add_serial_getty(const char *tty) { |
71 | char *n; | |
72 | int r; | |
73 | ||
74 | assert(tty); | |
75 | ||
76 | log_debug("Automatically adding serial getty for /dev/%s.", tty); | |
77 | ||
78 | n = unit_name_replace_instance("serial-getty@.service", tty); | |
79 | if (!n) { | |
80 | log_error("Out of memory"); | |
81 | return -ENOMEM; | |
82 | } | |
83 | ||
84 | r = add_symlink("serial-getty@.service", n); | |
85 | free(n); | |
86 | ||
87 | return r; | |
88 | } | |
89 | ||
2a796654 | 90 | int main(int argc, char *argv[]) { |
3c20189a LP |
91 | |
92 | static const char virtualization_consoles[] = | |
93 | "hvc0\0" | |
94 | "xvc0\0" | |
95 | "hvsi0\0"; | |
96 | ||
2a796654 LP |
97 | int r = EXIT_SUCCESS; |
98 | char *active; | |
3c20189a | 99 | const char *j; |
2a796654 LP |
100 | |
101 | if (argc > 2) { | |
102 | log_error("This program takes one or no arguments."); | |
103 | return EXIT_FAILURE; | |
104 | } | |
105 | ||
4cfa2c99 | 106 | log_set_target(LOG_TARGET_AUTO); |
2a796654 LP |
107 | log_parse_environment(); |
108 | log_open(); | |
109 | ||
4c12626c LP |
110 | umask(0022); |
111 | ||
3c20189a LP |
112 | if (argc > 1) |
113 | arg_dest = argv[1]; | |
114 | ||
2a796654 | 115 | if (detect_container(NULL) > 0) { |
6705c2df | 116 | log_debug("Automatically adding console shell."); |
2a796654 LP |
117 | |
118 | if (add_symlink("console-shell.service", "console-shell.service") < 0) | |
119 | r = EXIT_FAILURE; | |
120 | ||
121 | /* Don't add any further magic if we are in a container */ | |
122 | goto finish; | |
123 | } | |
124 | ||
125 | if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { | |
126 | const char *tty; | |
127 | ||
a17b785b LP |
128 | tty = strrchr(active, ' '); |
129 | if (tty) | |
2a796654 LP |
130 | tty ++; |
131 | else | |
132 | tty = active; | |
133 | ||
134 | /* Automatically add in a serial getty on the kernel | |
135 | * console */ | |
3c20189a LP |
136 | if (tty_is_vc(tty)) |
137 | free(active); | |
138 | else { | |
3c20189a | 139 | int k; |
2a796654 LP |
140 | |
141 | /* We assume that gettys on virtual terminals are | |
142 | * started via manual configuration and do this magic | |
143 | * only for non-VC terminals. */ | |
144 | ||
4dc380d1 | 145 | k = add_serial_getty(tty); |
3c20189a LP |
146 | free(active); |
147 | ||
3c20189a LP |
148 | if (k < 0) { |
149 | r = EXIT_FAILURE; | |
150 | goto finish; | |
151 | } | |
152 | } | |
2a796654 LP |
153 | } |
154 | ||
155 | /* Automatically add in a serial getty on the first | |
156 | * virtualizer console */ | |
3c20189a | 157 | NULSTR_FOREACH(j, virtualization_consoles) { |
4dc380d1 | 158 | char *p; |
3c20189a | 159 | int k; |
2a796654 | 160 | |
3c20189a LP |
161 | if (asprintf(&p, "/sys/class/tty/%s", j) < 0) { |
162 | log_error("Out of memory"); | |
2a796654 | 163 | r = EXIT_FAILURE; |
3c20189a LP |
164 | goto finish; |
165 | } | |
980fc73d | 166 | |
3c20189a LP |
167 | k = access(p, F_OK); |
168 | free(p); | |
169 | ||
170 | if (k < 0) | |
171 | continue; | |
980fc73d | 172 | |
4dc380d1 | 173 | k = add_serial_getty(j); |
3c20189a LP |
174 | if (k < 0) { |
175 | r = EXIT_FAILURE; | |
176 | goto finish; | |
177 | } | |
2a796654 LP |
178 | } |
179 | ||
180 | finish: | |
181 | return r; | |
182 | } |