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util: split out escaping code into escape.[ch]
[thirdparty/systemd.git] / src / shared / generator.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4 This file is part of systemd.
5
6 Copyright 2014 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <unistd.h>
23
24 #include "dropin.h"
25 #include "escape.h"
26 #include "fileio.h"
27 #include "fstab-util.h"
28 #include "mkdir.h"
29 #include "path-util.h"
30 #include "special.h"
31 #include "unit-name.h"
32 #include "util.h"
33 #include "generator.h"
34
35 static int write_fsck_sysroot_service(const char *dir, const char *what) {
36 _cleanup_free_ char *device = NULL, *escaped = NULL;
37 _cleanup_fclose_ FILE *f = NULL;
38 const char *unit;
39 int r;
40
41 escaped = cescape(what);
42 if (!escaped)
43 return log_oom();
44
45 unit = strjoina(dir, "/systemd-fsck-root.service");
46 log_debug("Creating %s", unit);
47
48 r = unit_name_from_path(what, ".device", &device);
49 if (r < 0)
50 return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
51
52 f = fopen(unit, "wxe");
53 if (!f)
54 return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
55
56 fprintf(f,
57 "# Automatically generated by %1$s\n\n"
58 "[Unit]\n"
59 "Documentation=man:systemd-fsck-root.service(8)\n"
60 "Description=File System Check on %2$s\n"
61 "DefaultDependencies=no\n"
62 "BindsTo=%3$s\n"
63 "After=%3$s\n"
64 "Before=shutdown.target\n"
65 "\n"
66 "[Service]\n"
67 "Type=oneshot\n"
68 "RemainAfterExit=yes\n"
69 "ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
70 "TimeoutSec=0\n",
71 program_invocation_short_name,
72 what,
73 device,
74 escaped);
75
76 r = fflush_and_check(f);
77 if (r < 0)
78 return log_error_errno(r, "Failed to write unit file %s: %m", unit);
79
80 return 0;
81 }
82
83 int generator_write_fsck_deps(
84 FILE *f,
85 const char *dir,
86 const char *what,
87 const char *where,
88 const char *fstype) {
89
90 int r;
91
92 assert(f);
93 assert(dir);
94 assert(what);
95 assert(where);
96
97 if (!is_device_path(what)) {
98 log_warning("Checking was requested for \"%s\", but it is not a device.", what);
99 return 0;
100 }
101
102 if (!isempty(fstype) && !streq(fstype, "auto")) {
103 r = fsck_exists(fstype);
104 if (r < 0)
105 log_warning_errno(r, "Checking was requested for %s, but couldn't detect if fsck.%s may be used, proceeding: %m", what, fstype);
106 else if (r == 0) {
107 /* treat missing check as essentially OK */
108 log_debug("Checking was requested for %s, but fsck.%s does not exist.", what, fstype);
109 return 0;
110 }
111 }
112
113 if (path_equal(where, "/")) {
114 const char *lnk;
115
116 lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
117
118 mkdir_parents(lnk, 0755);
119 if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
120 return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
121
122 } else {
123 _cleanup_free_ char *_fsck = NULL;
124 const char *fsck;
125
126 if (in_initrd() && path_equal(where, "/sysroot")) {
127 r = write_fsck_sysroot_service(dir, what);
128 if (r < 0)
129 return r;
130
131 fsck = "systemd-fsck-root.service";
132 } else {
133 r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
134 if (r < 0)
135 return log_error_errno(r, "Failed to create fsck service name: %m");
136
137 fsck = _fsck;
138 }
139
140 fprintf(f,
141 "RequiresOverridable=%1$s\n"
142 "After=%1$s\n",
143 fsck);
144 }
145
146 return 0;
147 }
148
149 int generator_write_timeouts(
150 const char *dir,
151 const char *what,
152 const char *where,
153 const char *opts,
154 char **filtered) {
155
156 /* Allow configuration how long we wait for a device that
157 * backs a mount point to show up. This is useful to support
158 * endless device timeouts for devices that show up only after
159 * user input, like crypto devices. */
160
161 _cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
162 usec_t u;
163 int r;
164
165 r = fstab_filter_options(opts, "comment=systemd.device-timeout\0" "x-systemd.device-timeout\0",
166 NULL, &timeout, filtered);
167 if (r <= 0)
168 return r;
169
170 r = parse_sec(timeout, &u);
171 if (r < 0) {
172 log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
173 return 0;
174 }
175
176 node = fstab_node_to_udev_node(what);
177 if (!node)
178 return log_oom();
179
180 r = unit_name_from_path(node, ".device", &unit);
181 if (r < 0)
182 return log_error_errno(r, "Failed to make unit name from path: %m");
183
184 return write_drop_in_format(dir, unit, 50, "device-timeout",
185 "# Automatically generated by %s\n\n"
186 "[Unit]\nJobTimeoutSec=" USEC_FMT,
187 program_invocation_short_name,
188 u / USEC_PER_SEC);
189 }