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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
29686440 | 2 | |
a8fbdf54 TA |
3 | #include <errno.h> |
4 | #include <stdarg.h> | |
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | ||
b5efdb8a | 8 | #include "alloc-util.h" |
f4351959 | 9 | #include "chase-symlinks.h" |
1a7f1b38 | 10 | #include "conf-files.h" |
8fb3f009 | 11 | #include "dirent-util.h" |
3ffd4af2 | 12 | #include "dropin.h" |
4f5dd394 | 13 | #include "escape.h" |
3ffd4af2 | 14 | #include "fd-util.h" |
4f5dd394 | 15 | #include "fileio-label.h" |
a8fbdf54 TA |
16 | #include "hashmap.h" |
17 | #include "log.h" | |
18 | #include "macro.h" | |
4f5dd394 | 19 | #include "mkdir.h" |
bb15fafe | 20 | #include "path-util.h" |
a8fbdf54 | 21 | #include "set.h" |
07630cea | 22 | #include "string-util.h" |
4f5dd394 | 23 | #include "strv.h" |
a8fbdf54 | 24 | #include "unit-name.h" |
29686440 | 25 | |
8eea8687 | 26 | int drop_in_file(const char *dir, const char *unit, unsigned level, |
f1b4b94c | 27 | const char *name, char **ret_p, char **ret_q) { |
29686440 | 28 | |
09c62487 | 29 | char prefix[DECIMAL_STR_MAX(unsigned)]; |
f1b4b94c | 30 | _cleanup_free_ char *b = NULL, *p = NULL, *q = NULL; |
29686440 ZJS |
31 | |
32 | assert(unit); | |
33 | assert(name); | |
f1b4b94c ZJS |
34 | assert(ret_p); |
35 | assert(ret_q); | |
29686440 | 36 | |
8eea8687 ZJS |
37 | sprintf(prefix, "%u", level); |
38 | ||
29686440 ZJS |
39 | b = xescape(name, "/."); |
40 | if (!b) | |
41 | return -ENOMEM; | |
42 | ||
ae6c3cc0 | 43 | if (!filename_is_valid(b)) |
29686440 ZJS |
44 | return -EINVAL; |
45 | ||
605405c6 | 46 | p = strjoin(dir, "/", unit, ".d"); |
605405c6 | 47 | q = strjoin(p, "/", prefix, "-", b, ".conf"); |
f1b4b94c | 48 | if (!p || !q) |
29686440 | 49 | return -ENOMEM; |
29686440 | 50 | |
f1b4b94c ZJS |
51 | *ret_p = TAKE_PTR(p); |
52 | *ret_q = TAKE_PTR(q); | |
29686440 ZJS |
53 | return 0; |
54 | } | |
55 | ||
8eea8687 | 56 | int write_drop_in(const char *dir, const char *unit, unsigned level, |
29686440 ZJS |
57 | const char *name, const char *data) { |
58 | ||
59 | _cleanup_free_ char *p = NULL, *q = NULL; | |
60 | int r; | |
61 | ||
62 | assert(dir); | |
63 | assert(unit); | |
64 | assert(name); | |
65 | assert(data); | |
66 | ||
8eea8687 | 67 | r = drop_in_file(dir, unit, level, name, &p, &q); |
29686440 ZJS |
68 | if (r < 0) |
69 | return r; | |
70 | ||
45519fd6 | 71 | (void) mkdir_p(p, 0755); |
29686440 ZJS |
72 | return write_string_file_atomic_label(q, data); |
73 | } | |
74 | ||
8eea8687 | 75 | int write_drop_in_format(const char *dir, const char *unit, unsigned level, |
29686440 ZJS |
76 | const char *name, const char *format, ...) { |
77 | _cleanup_free_ char *p = NULL; | |
78 | va_list ap; | |
79 | int r; | |
80 | ||
81 | assert(dir); | |
82 | assert(unit); | |
83 | assert(name); | |
84 | assert(format); | |
85 | ||
86 | va_start(ap, format); | |
87 | r = vasprintf(&p, format, ap); | |
88 | va_end(ap); | |
89 | ||
90 | if (r < 0) | |
91 | return -ENOMEM; | |
92 | ||
8eea8687 | 93 | return write_drop_in(dir, unit, level, name, p); |
29686440 | 94 | } |
1a7f1b38 | 95 | |
47a00111 | 96 | static int unit_file_add_dir( |
17e78d18 | 97 | const char *original_root, |
dcc4f30e ZJS |
98 | const char *path, |
99 | char ***dirs) { | |
1a7f1b38 | 100 | |
17e78d18 | 101 | _cleanup_free_ char *chased = NULL; |
1a7f1b38 ZJS |
102 | int r; |
103 | ||
104 | assert(path); | |
105 | ||
47a00111 ZJS |
106 | /* This adds [original_root]/path to dirs, if it exists. */ |
107 | ||
a5648b80 | 108 | r = chase_symlinks(path, original_root, 0, &chased, NULL); |
952713b0 | 109 | if (r == -ENOENT) /* Ignore -ENOENT, after all most units won't have a drop-in dir. */ |
09c62487 | 110 | return 0; |
952713b0 LP |
111 | if (r == -ENAMETOOLONG) { |
112 | /* Also, ignore -ENAMETOOLONG but log about it. After all, users are not even able to create the | |
113 | * drop-in dir in such case. This mostly happens for device units with an overly long /sys path. */ | |
114 | log_debug_errno(r, "Path '%s' too long, couldn't canonicalize, ignoring.", path); | |
115 | return 0; | |
116 | } | |
17e78d18 | 117 | if (r < 0) |
952713b0 | 118 | return log_warning_errno(r, "Failed to canonicalize path '%s': %m", path); |
17e78d18 | 119 | |
f1b4b94c | 120 | if (strv_consume(dirs, TAKE_PTR(chased)) < 0) |
dcc4f30e | 121 | return log_oom(); |
1a7f1b38 ZJS |
122 | |
123 | return 0; | |
124 | } | |
125 | ||
dcc4f30e | 126 | static int unit_file_find_dirs( |
17e78d18 | 127 | const char *original_root, |
7410616c | 128 | Set *unit_path_cache, |
1a7f1b38 ZJS |
129 | const char *unit_path, |
130 | const char *name, | |
131 | const char *suffix, | |
dcc4f30e | 132 | char ***dirs) { |
1a7f1b38 | 133 | |
53966245 LP |
134 | _cleanup_free_ char *prefix = NULL, *instance = NULL, *built = NULL; |
135 | bool is_instance, chopped; | |
136 | const char *dash; | |
137 | UnitType type; | |
96bb2fd8 | 138 | char *path; |
53966245 | 139 | size_t n; |
7410616c | 140 | int r; |
1a7f1b38 ZJS |
141 | |
142 | assert(unit_path); | |
143 | assert(name); | |
144 | assert(suffix); | |
145 | ||
96bb2fd8 | 146 | path = strjoina(unit_path, "/", name, suffix); |
dcc4f30e | 147 | if (!unit_path_cache || set_get(unit_path_cache, path)) { |
47a00111 | 148 | r = unit_file_add_dir(original_root, path, dirs); |
dcc4f30e ZJS |
149 | if (r < 0) |
150 | return r; | |
151 | } | |
1a7f1b38 | 152 | |
53966245 LP |
153 | is_instance = unit_name_is_valid(name, UNIT_NAME_INSTANCE); |
154 | if (is_instance) { /* Also try the template dir */ | |
a09d3eaf LP |
155 | _cleanup_free_ char *template = NULL; |
156 | ||
7410616c LP |
157 | r = unit_name_template(name, &template); |
158 | if (r < 0) | |
159 | return log_error_errno(r, "Failed to generate template from unit name: %m"); | |
1a7f1b38 | 160 | |
53966245 LP |
161 | r = unit_file_find_dirs(original_root, unit_path_cache, unit_path, template, suffix, dirs); |
162 | if (r < 0) | |
163 | return r; | |
1a7f1b38 ZJS |
164 | } |
165 | ||
3e1db806 AZ |
166 | /* Return early for top level drop-ins. */ |
167 | if (unit_type_from_string(name) >= 0) | |
168 | return 0; | |
169 | ||
53966245 LP |
170 | /* Let's see if there's a "-" prefix for this unit name. If so, let's invoke ourselves for it. This will then |
171 | * recursively do the same for all our prefixes. i.e. this means given "foo-bar-waldo.service" we'll also | |
172 | * search "foo-bar-.service" and "foo-.service". | |
173 | * | |
174 | * Note the order in which we do it: we traverse up adding drop-ins on each step. This means the more specific | |
175 | * drop-ins may override the more generic drop-ins, which is the intended behaviour. */ | |
176 | ||
177 | r = unit_name_to_prefix(name, &prefix); | |
178 | if (r < 0) | |
179 | return log_error_errno(r, "Failed to derive unit name prefix from unit name: %m"); | |
180 | ||
181 | chopped = false; | |
182 | for (;;) { | |
183 | dash = strrchr(prefix, '-'); | |
184 | if (!dash) /* No dash? if so we are done */ | |
185 | return 0; | |
186 | ||
187 | n = (size_t) (dash - prefix); | |
188 | if (n == 0) /* Leading dash? If so, we are done */ | |
189 | return 0; | |
190 | ||
191 | if (prefix[n+1] != 0 || chopped) { | |
192 | prefix[n+1] = 0; | |
193 | break; | |
194 | } | |
195 | ||
196 | /* Trailing dash? If so, chop it off and try again, but not more than once. */ | |
197 | prefix[n] = 0; | |
198 | chopped = true; | |
199 | } | |
200 | ||
201 | if (!unit_prefix_is_valid(prefix)) | |
202 | return 0; | |
203 | ||
204 | type = unit_name_to_type(name); | |
baaa35ad ZJS |
205 | if (type < 0) |
206 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
cd990847 | 207 | "Failed to derive unit type from unit name: %s", |
baaa35ad | 208 | name); |
53966245 LP |
209 | |
210 | if (is_instance) { | |
211 | r = unit_name_to_instance(name, &instance); | |
212 | if (r < 0) | |
213 | return log_error_errno(r, "Failed to derive unit name instance from unit name: %m"); | |
214 | } | |
215 | ||
216 | r = unit_name_build_from_type(prefix, instance, type, &built); | |
217 | if (r < 0) | |
218 | return log_error_errno(r, "Failed to build prefix unit name: %m"); | |
219 | ||
220 | return unit_file_find_dirs(original_root, unit_path_cache, unit_path, built, suffix, dirs); | |
1a7f1b38 ZJS |
221 | } |
222 | ||
223 | int unit_file_find_dropin_paths( | |
17e78d18 | 224 | const char *original_root, |
1a7f1b38 ZJS |
225 | char **lookup_path, |
226 | Set *unit_path_cache, | |
95778782 ZJS |
227 | const char *dir_suffix, |
228 | const char *file_suffix, | |
4562c355 ZJS |
229 | const char *name, |
230 | const Set *aliases, | |
058db925 | 231 | char ***ret) { |
1a7f1b38 | 232 | |
3f6de63b | 233 | _cleanup_strv_free_ char **dirs = NULL; |
4562c355 | 234 | const char *n; |
1a7f1b38 ZJS |
235 | int r; |
236 | ||
058db925 | 237 | assert(ret); |
1a7f1b38 | 238 | |
4562c355 | 239 | if (name) |
e6627f23 GGM |
240 | STRV_FOREACH(p, lookup_path) |
241 | (void) unit_file_find_dirs(original_root, unit_path_cache, *p, name, dir_suffix, &dirs); | |
242 | ||
90e74a66 | 243 | SET_FOREACH(n, aliases) |
4562c355 ZJS |
244 | STRV_FOREACH(p, lookup_path) |
245 | (void) unit_file_find_dirs(original_root, unit_path_cache, *p, n, dir_suffix, &dirs); | |
246 | ||
d2724678 | 247 | /* All the names in the unit are of the same type so just grab one. */ |
4562c355 ZJS |
248 | n = name ?: (const char*) set_first(aliases); |
249 | if (n) { | |
7a670b1d TM |
250 | UnitType type = _UNIT_TYPE_INVALID; |
251 | ||
4562c355 | 252 | type = unit_name_to_type(n); |
d2724678 AZ |
253 | if (type < 0) |
254 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
cd990847 | 255 | "Failed to derive unit type from unit name: %s", n); |
d2724678 | 256 | |
e6627f23 | 257 | /* Special top level drop in for "<unit type>.<suffix>". Add this last as it's the most generic |
7a670b1d TM |
258 | * and should be able to be overridden by more specific drop-ins. */ |
259 | STRV_FOREACH(p, lookup_path) | |
260 | (void) unit_file_find_dirs(original_root, | |
261 | unit_path_cache, | |
262 | *p, | |
263 | unit_type_to_string(type), | |
264 | dir_suffix, | |
265 | &dirs); | |
266 | } | |
d2724678 | 267 | |
058db925 LP |
268 | if (strv_isempty(dirs)) { |
269 | *ret = NULL; | |
1a7f1b38 | 270 | return 0; |
058db925 | 271 | } |
1a7f1b38 | 272 | |
b5084605 | 273 | r = conf_files_list_strv(ret, file_suffix, NULL, 0, (const char**) dirs); |
1a7f1b38 | 274 | if (r < 0) |
3f6de63b | 275 | return log_warning_errno(r, "Failed to create the list of configuration files: %m"); |
058db925 | 276 | |
1a7f1b38 ZJS |
277 | return 1; |
278 | } |