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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2015 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 <sys/prctl.h> | |
23 | #include <curl/curl.h> | |
24 | ||
25 | #include "hashmap.h" | |
26 | #include "utf8.h" | |
27 | #include "strv.h" | |
28 | #include "copy.h" | |
29 | #include "btrfs-util.h" | |
30 | #include "util.h" | |
31 | #include "macro.h" | |
32 | #include "mkdir.h" | |
33 | #include "curl-util.h" | |
34 | #include "import-job.h" | |
35 | #include "import-util.h" | |
36 | #include "import-tar.h" | |
37 | ||
38 | struct TarImport { | |
39 | sd_event *event; | |
40 | CurlGlue *glue; | |
41 | ||
42 | char *image_root; | |
43 | ||
44 | ImportJob *tar_job; | |
45 | ||
46 | TarImportFinished on_finished; | |
47 | void *userdata; | |
48 | ||
49 | bool finished; | |
50 | ||
51 | char *local; | |
52 | bool force_local; | |
53 | ||
54 | pid_t tar_pid; | |
55 | ||
56 | char *temp_path; | |
57 | char *final_path; | |
58 | }; | |
59 | ||
60 | TarImport* tar_import_unref(TarImport *i) { | |
61 | if (!i) | |
62 | return NULL; | |
63 | ||
64 | if (i->tar_pid > 0) { | |
65 | kill(i->tar_pid, SIGKILL); | |
66 | wait_for_terminate(i->tar_pid, NULL); | |
67 | } | |
68 | ||
69 | import_job_unref(i->tar_job); | |
70 | ||
71 | curl_glue_unref(i->glue); | |
72 | sd_event_unref(i->event); | |
73 | ||
74 | if (i->temp_path) { | |
75 | (void) btrfs_subvol_remove(i->temp_path); | |
76 | (void) rm_rf_dangerous(i->temp_path, false, true, false); | |
77 | } | |
78 | ||
79 | free(i->final_path); | |
80 | free(i->image_root); | |
81 | free(i->local); | |
82 | ||
83 | free(i); | |
84 | ||
85 | return NULL; | |
86 | } | |
87 | ||
88 | int tar_import_new(TarImport **ret, sd_event *event, const char *image_root, TarImportFinished on_finished, void *userdata) { | |
89 | _cleanup_(tar_import_unrefp) TarImport *i = NULL; | |
90 | int r; | |
91 | ||
92 | assert(ret); | |
93 | assert(event); | |
94 | ||
95 | i = new0(TarImport, 1); | |
96 | if (!i) | |
97 | return -ENOMEM; | |
98 | ||
99 | i->on_finished = on_finished; | |
100 | i->userdata = userdata; | |
101 | ||
102 | i->image_root = strdup(image_root ?: "/var/lib/machines"); | |
103 | if (!i->image_root) | |
104 | return -ENOMEM; | |
105 | ||
106 | if (event) | |
107 | i->event = sd_event_ref(event); | |
108 | else { | |
109 | r = sd_event_default(&i->event); | |
110 | if (r < 0) | |
111 | return r; | |
112 | } | |
113 | ||
114 | r = curl_glue_new(&i->glue, i->event); | |
115 | if (r < 0) | |
116 | return r; | |
117 | ||
118 | i->glue->on_finished = import_job_curl_on_finished; | |
119 | i->glue->userdata = i; | |
120 | ||
121 | *ret = i; | |
122 | i = NULL; | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static void tar_import_job_on_finished(ImportJob *j) { | |
128 | TarImport *i; | |
129 | int r; | |
130 | ||
131 | assert(j); | |
132 | assert(j->userdata); | |
133 | ||
134 | i = j->userdata; | |
135 | ||
136 | if (j->error != 0) { | |
137 | r = j->error; | |
138 | goto finish; | |
139 | } | |
140 | ||
141 | /* This is invoked if either the download completed | |
142 | * successfully, or the download was skipped because we | |
143 | * already have the etag. */ | |
144 | ||
145 | j->disk_fd = safe_close(j->disk_fd); | |
146 | ||
147 | if (i->tar_pid > 0) { | |
148 | r = wait_for_terminate_and_warn("tar", i->tar_pid, true); | |
149 | i->tar_pid = 0; | |
150 | if (r < 0) | |
151 | goto finish; | |
152 | } | |
153 | ||
154 | if (i->temp_path) { | |
155 | r = import_make_read_only(i->temp_path); | |
156 | if (r < 0) | |
157 | goto finish; | |
158 | ||
159 | if (rename(i->temp_path, i->final_path) < 0) { | |
160 | r = log_error_errno(errno, "Failed to rename to final image name: %m"); | |
161 | goto finish; | |
162 | } | |
163 | } | |
164 | ||
165 | if (i->local) { | |
166 | if (!i->final_path) { | |
167 | r = import_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &i->final_path); | |
168 | if (r < 0) | |
169 | goto finish; | |
170 | } | |
171 | ||
172 | r = import_make_local_copy(i->final_path, i->image_root, i->local, i->force_local); | |
173 | if (r < 0) | |
174 | goto finish; | |
175 | } | |
176 | ||
177 | r = 0; | |
178 | ||
179 | finish: | |
180 | i->finished = true; | |
181 | ||
182 | if (i->on_finished) | |
183 | i->on_finished(i, r, i->userdata); | |
184 | else | |
185 | sd_event_exit(i->event, r); | |
186 | } | |
187 | ||
188 | static int tar_import_job_on_open_disk(ImportJob *j) { | |
189 | _cleanup_close_pair_ int pipefd[2] = { -1 , -1 }; | |
190 | TarImport *i; | |
191 | int r; | |
192 | ||
193 | assert(j); | |
194 | assert(j->userdata); | |
195 | ||
196 | i = j->userdata; | |
197 | ||
198 | r = import_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &i->final_path); | |
199 | if (r < 0) | |
200 | return log_oom(); | |
201 | ||
202 | r = tempfn_random(i->final_path, &i->temp_path); | |
203 | if (r < 0) | |
204 | return log_oom(); | |
205 | ||
206 | mkdir_parents_label(i->temp_path, 0700); | |
207 | ||
208 | r = btrfs_subvol_make(i->temp_path); | |
209 | if (r == -ENOTTY) { | |
210 | if (mkdir(i->temp_path, 0755) < 0) | |
211 | return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path); | |
212 | } else if (r < 0) | |
213 | return log_error_errno(errno, "Failed to create subvolume %s: %m", i->temp_path); | |
214 | ||
215 | if (pipe2(pipefd, O_CLOEXEC) < 0) | |
216 | return log_error_errno(errno, "Failed to create pipe for tar: %m"); | |
217 | ||
218 | i->tar_pid = fork(); | |
219 | if (i->tar_pid < 0) | |
220 | return log_error_errno(errno, "Failed to fork off tar: %m"); | |
221 | if (i->tar_pid == 0) { | |
222 | int null_fd; | |
223 | ||
224 | reset_all_signal_handlers(); | |
225 | reset_signal_mask(); | |
226 | assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); | |
227 | ||
228 | pipefd[1] = safe_close(pipefd[1]); | |
229 | ||
230 | if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) { | |
231 | log_error_errno(errno, "Failed to dup2() fd: %m"); | |
232 | _exit(EXIT_FAILURE); | |
233 | } | |
234 | ||
235 | if (pipefd[0] != STDIN_FILENO) | |
236 | safe_close(pipefd[0]); | |
237 | ||
238 | null_fd = open("/dev/null", O_WRONLY|O_NOCTTY); | |
239 | if (null_fd < 0) { | |
240 | log_error_errno(errno, "Failed to open /dev/null: %m"); | |
241 | _exit(EXIT_FAILURE); | |
242 | } | |
243 | ||
244 | if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) { | |
245 | log_error_errno(errno, "Failed to dup2() fd: %m"); | |
246 | _exit(EXIT_FAILURE); | |
247 | } | |
248 | ||
249 | if (null_fd != STDOUT_FILENO) | |
250 | safe_close(null_fd); | |
251 | ||
252 | execlp("tar", "tar", "--numeric-owner", "-C", i->temp_path, "-px", NULL); | |
253 | _exit(EXIT_FAILURE); | |
254 | } | |
255 | ||
256 | pipefd[0] = safe_close(pipefd[0]); | |
257 | ||
258 | j->disk_fd = pipefd[1]; | |
259 | pipefd[1] = -1; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | int tar_import_pull(TarImport *i, const char *url, const char *local, bool force_local) { | |
265 | int r; | |
266 | ||
267 | assert(i); | |
268 | ||
269 | if (i->tar_job) | |
270 | return -EBUSY; | |
271 | ||
272 | if (!http_url_is_valid(url)) | |
273 | return -EINVAL; | |
274 | ||
275 | if (local && !machine_name_is_valid(local)) | |
276 | return -EINVAL; | |
277 | ||
278 | r = free_and_strdup(&i->local, local); | |
279 | if (r < 0) | |
280 | return r; | |
281 | ||
282 | i->force_local = force_local; | |
283 | ||
284 | r = import_job_new(&i->tar_job, url, i->glue, i); | |
285 | if (r < 0) | |
286 | return r; | |
287 | ||
288 | i->tar_job->on_finished = tar_import_job_on_finished; | |
289 | i->tar_job->on_open_disk = tar_import_job_on_open_disk; | |
290 | ||
291 | r = import_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags); | |
292 | if (r < 0) | |
293 | return r; | |
294 | ||
295 | return import_job_begin(i->tar_job); | |
296 | } |