1 /*
2  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 
19 #include <errno.h>
20 #include <event.h>
21 #include <fcntl.h>
22 #include <imsg.h>
23 #include <sha2.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <limits.h>
28 #include <unistd.h>
29 
30 #include "got_error.h"
31 #include "got_object.h"
32 #include "got_repository.h"
33 #include "got_path.h"
34 
35 #include "got_lib_gitconfig.h"
36 #include "got_lib_delta.h"
37 #include "got_lib_object.h"
38 #include "got_lib_object_cache.h"
39 #include "got_lib_privsep.h"
40 #include "got_lib_pack.h"
41 #include "got_lib_repository.h"
42 
43 static int
44 get_boolean_val(char *val)
45 {
46     return (strcasecmp(val, "true") == 0 ||
47 	strcasecmp(val, "on") == 0 ||
48 	strcasecmp(val, "yes") == 0 ||
49 	strcmp(val, "1") == 0);
50 }
51 
52 const struct got_error *
53 got_repo_read_gitconfig(int *gitconfig_repository_format_version,
54     char **gitconfig_author_name, char **gitconfig_author_email,
55     struct got_remote_repo **remotes, int *nremotes,
56     char **gitconfig_owner, char ***extnames, char ***extvals,
57     int *nextensions, const char *gitconfig_path)
58 {
59 	const struct got_error *err = NULL;
60 	struct got_gitconfig *gitconfig = NULL;
61 	struct got_gitconfig_list *tags;
62 	struct got_gitconfig_list_node *node;
63 	int fd, i;
64 	const char *author, *email, *owner;
65 
66 	*gitconfig_repository_format_version = 0;
67 	if (extnames)
68 		*extnames = NULL;
69 	if (extvals)
70 		*extvals = NULL;
71 	if (nextensions)
72 		*nextensions = 0;
73 	*gitconfig_author_name = NULL;
74 	*gitconfig_author_email = NULL;
75 	if (remotes)
76 		*remotes = NULL;
77 	if (nremotes)
78 		*nremotes = 0;
79 	if (gitconfig_owner)
80 		*gitconfig_owner = NULL;
81 
82 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
83 	if (fd == -1) {
84 		if (errno == ENOENT)
85 			return NULL;
86 		return got_error_from_errno2("open", gitconfig_path);
87 	}
88 
89 	err = got_gitconfig_open(&gitconfig, fd);
90 	if (err)
91 		goto done;
92 
93 	*gitconfig_repository_format_version = got_gitconfig_get_num(gitconfig,
94 	    "core", "repositoryformatversion", 0);
95 
96 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");
97 	if (extnames && extvals && nextensions && tags) {
98 		size_t numext = 0;
99 		TAILQ_FOREACH(node, &tags->fields, link) {
100 			char *ext = node->field;
101 			char *val = got_gitconfig_get_str(gitconfig,
102 			    "extensions", ext);
103 			if (get_boolean_val(val))
104 				numext++;
105 		}
106 		*extnames = calloc(numext, sizeof(char *));
107 		if (*extnames == NULL) {
108 			err = got_error_from_errno("calloc");
109 			goto done;
110 		}
111 		*extvals = calloc(numext, sizeof(char *));
112 		if (*extvals == NULL) {
113 			err = got_error_from_errno("calloc");
114 			goto done;
115 		}
116 		TAILQ_FOREACH(node, &tags->fields, link) {
117 			char *ext = node->field;
118 			char *val = got_gitconfig_get_str(gitconfig,
119 			    "extensions", ext);
120 			if (get_boolean_val(val)) {
121 				char *extstr = NULL, *valstr = NULL;
122 
123 				extstr = strdup(ext);
124 				if (extstr == NULL) {
125 					err = got_error_from_errno("strdup");
126 					goto done;
127 				}
128 				valstr = strdup(val);
129 				if (valstr == NULL) {
130 					err = got_error_from_errno("strdup");
131 					goto done;
132 				}
133 				(*extnames)[(*nextensions)] = extstr;
134 				(*extvals)[(*nextensions)] = valstr;
135 				(*nextensions)++;
136 			}
137 		}
138 	}
139 
140 	author = got_gitconfig_get_str(gitconfig, "user", "name");
141 	if (author) {
142 		*gitconfig_author_name = strdup(author);
143 		if (*gitconfig_author_name == NULL) {
144 			err = got_error_from_errno("strdup");
145 			goto done;
146 		}
147 	}
148 
149 	email = got_gitconfig_get_str(gitconfig, "user", "email");
150 	if (email) {
151 		*gitconfig_author_email = strdup(email);
152 		if (*gitconfig_author_email == NULL) {
153 			err = got_error_from_errno("strdup");
154 			goto done;
155 		}
156 	}
157 
158 	if (gitconfig_owner) {
159 		owner = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
160 		if (owner == NULL)
161 			owner = got_gitconfig_get_str(gitconfig, "gitweb",
162 			    "owner");
163 		if (owner) {
164 			*gitconfig_owner = strdup(owner);
165 			if (*gitconfig_owner == NULL) {
166 				err = got_error_from_errno("strdup");
167 				goto done;
168 			}
169 
170 		}
171 	}
172 
173 	if (remotes && nremotes) {
174 		struct got_gitconfig_list *sections;
175 		size_t nalloc = 0;
176 		err = got_gitconfig_get_section_list(&sections, gitconfig);
177 		if (err)
178 			return err;
179 		TAILQ_FOREACH(node, &sections->fields, link) {
180 			if (strncasecmp("remote \"", node->field, 8) != 0)
181 				continue;
182 			nalloc++;
183 		}
184 
185 		*remotes = recallocarray(NULL, 0, nalloc, sizeof(**remotes));
186 		if (*remotes == NULL) {
187 			err = got_error_from_errno("recallocarray");
188 			goto done;
189 		}
190 
191 		i = 0;
192 		TAILQ_FOREACH(node, &sections->fields, link) {
193 			struct got_remote_repo *remote;
194 			char *name, *end, *mirror;
195 			const char *fetch_url, *send_url;
196 
197 			if (strncasecmp("remote \"", node->field, 8) != 0)
198 				continue;
199 
200 			remote = &(*remotes)[i];
201 
202 			name = strdup(node->field + 8);
203 			if (name == NULL) {
204 				err = got_error_from_errno("strdup");
205 				goto done;
206 			}
207 			end = strrchr(name, '"');
208 			if (end)
209 				*end = '\0';
210 			remote->name = name;
211 
212 			fetch_url = got_gitconfig_get_str(gitconfig,
213 			    node->field, "url");
214 			if (fetch_url == NULL) {
215 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
216 				free(remote->name);
217 				remote->name = NULL;
218 				goto done;
219 			}
220 			remote->fetch_url = strdup(fetch_url);
221 			if (remote->fetch_url == NULL) {
222 				err = got_error_from_errno("strdup");
223 				free(remote->name);
224 				remote->name = NULL;
225 				goto done;
226 			}
227 
228 			send_url = got_gitconfig_get_str(gitconfig,
229 			    node->field, "pushurl");
230 			if (send_url == NULL)
231 				send_url = got_gitconfig_get_str(gitconfig,
232 				    node->field, "url");
233 			if (send_url == NULL) {
234 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
235 				free(remote->name);
236 				remote->name = NULL;
237 				free(remote->fetch_url);
238 				remote->fetch_url = NULL;
239 				goto done;
240 			}
241 			remote->send_url = strdup(send_url);
242 			if (remote->send_url == NULL) {
243 				err = got_error_from_errno("strdup");
244 				free(remote->name);
245 				remote->name = NULL;
246 				free(remote->fetch_url);
247 				remote->fetch_url = NULL;
248 				goto done;
249 			}
250 
251 			remote->mirror_references = 0;
252 			mirror = got_gitconfig_get_str(gitconfig, node->field,
253 			    "mirror");
254 			if (mirror != NULL && get_boolean_val(mirror))
255 				remote->mirror_references = 1;
256 
257 			i++;
258 			(*nremotes)++;
259 		}
260 	}
261 done:
262 	if (fd != -1)
263 		close(fd);
264 	if (gitconfig)
265 		got_gitconfig_close(gitconfig);
266 	if (err) {
267 		if (extnames && extvals && nextensions) {
268 			for (i = 0; i < (*nextensions); i++) {
269 				free((*extnames)[i]);
270 				free((*extvals)[i]);
271 			}
272 			free(*extnames);
273 			*extnames = NULL;
274 			free(*extvals);
275 			*extvals = NULL;
276 			*nextensions = 0;
277 		}
278 		if (remotes && nremotes) {
279 			for (i = 0; i < (*nremotes); i++) {
280 				struct got_remote_repo *remote;
281 				remote = &(*remotes)[i];
282 				free(remote->name);
283 				free(remote->fetch_url);
284 				free(remote->send_url);
285 			}
286 			free(*remotes);
287 			*remotes = NULL;
288 			*nremotes = 0;
289 		}
290 	}
291 	return err;
292 }