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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
29686440 | 2 | /*** |
29686440 | 3 | Copyright 2014 Zbigniew Jędrzejewski-Szmek |
29686440 ZJS |
4 | ***/ |
5 | ||
a8fbdf54 TA |
6 | #include <errno.h> |
7 | #include <stdarg.h> | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | ||
b5efdb8a | 11 | #include "alloc-util.h" |
1a7f1b38 | 12 | #include "conf-files.h" |
8fb3f009 | 13 | #include "dirent-util.h" |
3ffd4af2 | 14 | #include "dropin.h" |
4f5dd394 | 15 | #include "escape.h" |
3ffd4af2 | 16 | #include "fd-util.h" |
4f5dd394 | 17 | #include "fileio-label.h" |
17e78d18 | 18 | #include "fs-util.h" |
a8fbdf54 TA |
19 | #include "hashmap.h" |
20 | #include "log.h" | |
21 | #include "macro.h" | |
4f5dd394 | 22 | #include "mkdir.h" |
bb15fafe | 23 | #include "path-util.h" |
a8fbdf54 | 24 | #include "set.h" |
07630cea | 25 | #include "string-util.h" |
4f5dd394 | 26 | #include "strv.h" |
a8fbdf54 | 27 | #include "unit-name.h" |
29686440 | 28 | |
8eea8687 | 29 | int drop_in_file(const char *dir, const char *unit, unsigned level, |
29686440 ZJS |
30 | const char *name, char **_p, char **_q) { |
31 | ||
09c62487 | 32 | char prefix[DECIMAL_STR_MAX(unsigned)]; |
29686440 ZJS |
33 | _cleanup_free_ char *b = NULL; |
34 | char *p, *q; | |
35 | ||
36 | assert(unit); | |
37 | assert(name); | |
38 | assert(_p); | |
39 | assert(_q); | |
40 | ||
8eea8687 ZJS |
41 | sprintf(prefix, "%u", level); |
42 | ||
29686440 ZJS |
43 | b = xescape(name, "/."); |
44 | if (!b) | |
45 | return -ENOMEM; | |
46 | ||
ae6c3cc0 | 47 | if (!filename_is_valid(b)) |
29686440 ZJS |
48 | return -EINVAL; |
49 | ||
605405c6 | 50 | p = strjoin(dir, "/", unit, ".d"); |
29686440 ZJS |
51 | if (!p) |
52 | return -ENOMEM; | |
53 | ||
605405c6 | 54 | q = strjoin(p, "/", prefix, "-", b, ".conf"); |
29686440 ZJS |
55 | if (!q) { |
56 | free(p); | |
57 | return -ENOMEM; | |
58 | } | |
59 | ||
60 | *_p = p; | |
61 | *_q = q; | |
62 | return 0; | |
63 | } | |
64 | ||
8eea8687 | 65 | int write_drop_in(const char *dir, const char *unit, unsigned level, |
29686440 ZJS |
66 | const char *name, const char *data) { |
67 | ||
68 | _cleanup_free_ char *p = NULL, *q = NULL; | |
69 | int r; | |
70 | ||
71 | assert(dir); | |
72 | assert(unit); | |
73 | assert(name); | |
74 | assert(data); | |
75 | ||
8eea8687 | 76 | r = drop_in_file(dir, unit, level, name, &p, &q); |
29686440 ZJS |
77 | if (r < 0) |
78 | return r; | |
79 | ||
45519fd6 | 80 | (void) mkdir_p(p, 0755); |
29686440 ZJS |
81 | return write_string_file_atomic_label(q, data); |
82 | } | |
83 | ||
8eea8687 | 84 | int write_drop_in_format(const char *dir, const char *unit, unsigned level, |
29686440 ZJS |
85 | const char *name, const char *format, ...) { |
86 | _cleanup_free_ char *p = NULL; | |
87 | va_list ap; | |
88 | int r; | |
89 | ||
90 | assert(dir); | |
91 | assert(unit); | |
92 | assert(name); | |
93 | assert(format); | |
94 | ||
95 | va_start(ap, format); | |
96 | r = vasprintf(&p, format, ap); | |
97 | va_end(ap); | |
98 | ||
99 | if (r < 0) | |
100 | return -ENOMEM; | |
101 | ||
8eea8687 | 102 | return write_drop_in(dir, unit, level, name, p); |
29686440 | 103 | } |
1a7f1b38 | 104 | |
dcc4f30e | 105 | static int unit_file_find_dir( |
17e78d18 | 106 | const char *original_root, |
dcc4f30e ZJS |
107 | const char *path, |
108 | char ***dirs) { | |
1a7f1b38 | 109 | |
17e78d18 | 110 | _cleanup_free_ char *chased = NULL; |
1a7f1b38 ZJS |
111 | int r; |
112 | ||
113 | assert(path); | |
114 | ||
17e78d18 | 115 | r = chase_symlinks(path, original_root, 0, &chased); |
952713b0 | 116 | if (r == -ENOENT) /* Ignore -ENOENT, after all most units won't have a drop-in dir. */ |
09c62487 | 117 | return 0; |
952713b0 LP |
118 | if (r == -ENAMETOOLONG) { |
119 | /* Also, ignore -ENAMETOOLONG but log about it. After all, users are not even able to create the | |
120 | * drop-in dir in such case. This mostly happens for device units with an overly long /sys path. */ | |
121 | log_debug_errno(r, "Path '%s' too long, couldn't canonicalize, ignoring.", path); | |
122 | return 0; | |
123 | } | |
17e78d18 | 124 | if (r < 0) |
952713b0 | 125 | return log_warning_errno(r, "Failed to canonicalize path '%s': %m", path); |
17e78d18 | 126 | |
dcc4f30e ZJS |
127 | r = strv_push(dirs, chased); |
128 | if (r < 0) | |
129 | return log_oom(); | |
1a7f1b38 | 130 | |
dcc4f30e | 131 | chased = NULL; |
1a7f1b38 ZJS |
132 | return 0; |
133 | } | |
134 | ||
dcc4f30e | 135 | static int unit_file_find_dirs( |
17e78d18 | 136 | const char *original_root, |
7410616c | 137 | Set *unit_path_cache, |
1a7f1b38 ZJS |
138 | const char *unit_path, |
139 | const char *name, | |
140 | const char *suffix, | |
dcc4f30e | 141 | char ***dirs) { |
1a7f1b38 | 142 | |
53966245 LP |
143 | _cleanup_free_ char *prefix = NULL, *instance = NULL, *built = NULL; |
144 | bool is_instance, chopped; | |
145 | const char *dash; | |
146 | UnitType type; | |
96bb2fd8 | 147 | char *path; |
53966245 | 148 | size_t n; |
7410616c | 149 | int r; |
1a7f1b38 ZJS |
150 | |
151 | assert(unit_path); | |
152 | assert(name); | |
153 | assert(suffix); | |
154 | ||
96bb2fd8 | 155 | path = strjoina(unit_path, "/", name, suffix); |
dcc4f30e ZJS |
156 | if (!unit_path_cache || set_get(unit_path_cache, path)) { |
157 | r = unit_file_find_dir(original_root, path, dirs); | |
158 | if (r < 0) | |
159 | return r; | |
160 | } | |
1a7f1b38 | 161 | |
53966245 LP |
162 | is_instance = unit_name_is_valid(name, UNIT_NAME_INSTANCE); |
163 | if (is_instance) { /* Also try the template dir */ | |
a09d3eaf LP |
164 | _cleanup_free_ char *template = NULL; |
165 | ||
7410616c LP |
166 | r = unit_name_template(name, &template); |
167 | if (r < 0) | |
168 | return log_error_errno(r, "Failed to generate template from unit name: %m"); | |
1a7f1b38 | 169 | |
53966245 LP |
170 | r = unit_file_find_dirs(original_root, unit_path_cache, unit_path, template, suffix, dirs); |
171 | if (r < 0) | |
172 | return r; | |
1a7f1b38 ZJS |
173 | } |
174 | ||
53966245 LP |
175 | /* Let's see if there's a "-" prefix for this unit name. If so, let's invoke ourselves for it. This will then |
176 | * recursively do the same for all our prefixes. i.e. this means given "foo-bar-waldo.service" we'll also | |
177 | * search "foo-bar-.service" and "foo-.service". | |
178 | * | |
179 | * Note the order in which we do it: we traverse up adding drop-ins on each step. This means the more specific | |
180 | * drop-ins may override the more generic drop-ins, which is the intended behaviour. */ | |
181 | ||
182 | r = unit_name_to_prefix(name, &prefix); | |
183 | if (r < 0) | |
184 | return log_error_errno(r, "Failed to derive unit name prefix from unit name: %m"); | |
185 | ||
186 | chopped = false; | |
187 | for (;;) { | |
188 | dash = strrchr(prefix, '-'); | |
189 | if (!dash) /* No dash? if so we are done */ | |
190 | return 0; | |
191 | ||
192 | n = (size_t) (dash - prefix); | |
193 | if (n == 0) /* Leading dash? If so, we are done */ | |
194 | return 0; | |
195 | ||
196 | if (prefix[n+1] != 0 || chopped) { | |
197 | prefix[n+1] = 0; | |
198 | break; | |
199 | } | |
200 | ||
201 | /* Trailing dash? If so, chop it off and try again, but not more than once. */ | |
202 | prefix[n] = 0; | |
203 | chopped = true; | |
204 | } | |
205 | ||
206 | if (!unit_prefix_is_valid(prefix)) | |
207 | return 0; | |
208 | ||
209 | type = unit_name_to_type(name); | |
210 | if (type < 0) { | |
b8b846d7 | 211 | log_error("Failed to to derive unit type from unit name: %s", name); |
53966245 LP |
212 | return -EINVAL; |
213 | } | |
214 | ||
215 | if (is_instance) { | |
216 | r = unit_name_to_instance(name, &instance); | |
217 | if (r < 0) | |
218 | return log_error_errno(r, "Failed to derive unit name instance from unit name: %m"); | |
219 | } | |
220 | ||
221 | r = unit_name_build_from_type(prefix, instance, type, &built); | |
222 | if (r < 0) | |
223 | return log_error_errno(r, "Failed to build prefix unit name: %m"); | |
224 | ||
225 | return unit_file_find_dirs(original_root, unit_path_cache, unit_path, built, suffix, dirs); | |
1a7f1b38 ZJS |
226 | } |
227 | ||
228 | int unit_file_find_dropin_paths( | |
17e78d18 | 229 | const char *original_root, |
1a7f1b38 ZJS |
230 | char **lookup_path, |
231 | Set *unit_path_cache, | |
95778782 ZJS |
232 | const char *dir_suffix, |
233 | const char *file_suffix, | |
1a7f1b38 | 234 | Set *names, |
058db925 | 235 | char ***ret) { |
1a7f1b38 | 236 | |
3f6de63b | 237 | _cleanup_strv_free_ char **dirs = NULL; |
dcc4f30e | 238 | char *t, **p; |
53966245 | 239 | Iterator i; |
1a7f1b38 ZJS |
240 | int r; |
241 | ||
058db925 | 242 | assert(ret); |
1a7f1b38 | 243 | |
dcc4f30e | 244 | SET_FOREACH(t, names, i) |
1a7f1b38 | 245 | STRV_FOREACH(p, lookup_path) |
53966245 | 246 | (void) unit_file_find_dirs(original_root, unit_path_cache, *p, t, dir_suffix, &dirs); |
1a7f1b38 | 247 | |
058db925 LP |
248 | if (strv_isempty(dirs)) { |
249 | *ret = NULL; | |
1a7f1b38 | 250 | return 0; |
058db925 | 251 | } |
1a7f1b38 | 252 | |
b5084605 | 253 | r = conf_files_list_strv(ret, file_suffix, NULL, 0, (const char**) dirs); |
1a7f1b38 | 254 | if (r < 0) |
3f6de63b | 255 | return log_warning_errno(r, "Failed to create the list of configuration files: %m"); |
058db925 | 256 | |
1a7f1b38 ZJS |
257 | return 1; |
258 | } |