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 #include <sys/tree.h>
19 
20 #include <errno.h>
21 #include <event.h>
22 #include <fcntl.h>
23 #include <imsg.h>
24 #include <sha1.h>
25 #include <sha2.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <limits.h>
30 #include <unistd.h>
31 
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_repository.h"
35 #include "got_path.h"
36 
37 #include "got_lib_gitconfig.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_object.h"
40 #include "got_lib_object_cache.h"
41 #include "got_lib_privsep.h"
42 #include "got_lib_pack.h"
43 #include "got_lib_repository.h"
44 
45 static int
46 get_boolean_val(char *val)
47 {
48     return (strcasecmp(val, "true") == 0 ||
49 	strcasecmp(val, "on") == 0 ||
50 	strcasecmp(val, "yes") == 0 ||
51 	strcmp(val, "1") == 0);
52 }
53 
54 const struct got_error *
55 got_repo_read_gitconfig(int *gitconfig_repository_format_version,
56     char **gitconfig_author_name, char **gitconfig_author_email,
57     struct got_remote_repo **remotes, int *nremotes,
58     char **gitconfig_owner, char ***extnames, char ***extvals,
59     int *nextensions, const char *gitconfig_path)
60 {
61 	const struct got_error *err = NULL;
62 	struct got_gitconfig *gitconfig = NULL;
63 	struct got_gitconfig_list *tags;
64 	struct got_gitconfig_list_node *node;
65 	int fd, i;
66 	const char *author, *email, *owner;
67 
68 	*gitconfig_repository_format_version = 0;
69 	if (extnames)
70 		*extnames = NULL;
71 	if (extvals)
72 		*extvals = NULL;
73 	if (nextensions)
74 		*nextensions = 0;
75 	*gitconfig_author_name = NULL;
76 	*gitconfig_author_email = NULL;
77 	if (remotes)
78 		*remotes = NULL;
79 	if (nremotes)
80 		*nremotes = 0;
81 	if (gitconfig_owner)
82 		*gitconfig_owner = NULL;
83 
84 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
85 	if (fd == -1) {
86 		if (errno == ENOENT)
87 			return NULL;
88 		return got_error_from_errno2("open", gitconfig_path);
89 	}
90 
91 	err = got_gitconfig_open(&gitconfig, fd);
92 	if (err)
93 		goto done;
94 
95 	*gitconfig_repository_format_version = got_gitconfig_get_num(gitconfig,
96 	    "core", "repositoryformatversion", 0);
97 
98 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");
99 	if (extnames && extvals && nextensions && tags) {
100 		size_t numext = 0;
101 		TAILQ_FOREACH(node, &tags->fields, link) {
102 			char *ext = node->field;
103 			char *val = got_gitconfig_get_str(gitconfig,
104 			    "extensions", ext);
105 			if (get_boolean_val(val))
106 				numext++;
107 		}
108 		*extnames = calloc(numext, sizeof(char *));
109 		if (*extnames == NULL) {
110 			err = got_error_from_errno("calloc");
111 			goto done;
112 		}
113 		*extvals = calloc(numext, sizeof(char *));
114 		if (*extvals == NULL) {
115 			err = got_error_from_errno("calloc");
116 			goto done;
117 		}
118 		TAILQ_FOREACH(node, &tags->fields, link) {
119 			char *ext = node->field;
120 			char *val = got_gitconfig_get_str(gitconfig,
121 			    "extensions", ext);
122 			if (get_boolean_val(val)) {
123 				char *extstr = NULL, *valstr = NULL;
124 
125 				extstr = strdup(ext);
126 				if (extstr == NULL) {
127 					err = got_error_from_errno("strdup");
128 					goto done;
129 				}
130 				valstr = strdup(val);
131 				if (valstr == NULL) {
132 					err = got_error_from_errno("strdup");
133 					goto done;
134 				}
135 				(*extnames)[(*nextensions)] = extstr;
136 				(*extvals)[(*nextensions)] = valstr;
137 				(*nextensions)++;
138 			}
139 		}
140 	}
141 
142 	author = got_gitconfig_get_str(gitconfig, "user", "name");
143 	if (author) {
144 		*gitconfig_author_name = strdup(author);
145 		if (*gitconfig_author_name == NULL) {
146 			err = got_error_from_errno("strdup");
147 			goto done;
148 		}
149 	}
150 
151 	email = got_gitconfig_get_str(gitconfig, "user", "email");
152 	if (email) {
153 		*gitconfig_author_email = strdup(email);
154 		if (*gitconfig_author_email == NULL) {
155 			err = got_error_from_errno("strdup");
156 			goto done;
157 		}
158 	}
159 
160 	if (gitconfig_owner) {
161 		owner = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
162 		if (owner == NULL)
163 			owner = got_gitconfig_get_str(gitconfig, "gitweb",
164 			    "owner");
165 		if (owner) {
166 			*gitconfig_owner = strdup(owner);
167 			if (*gitconfig_owner == NULL) {
168 				err = got_error_from_errno("strdup");
169 				goto done;
170 			}
171 
172 		}
173 	}
174 
175 	if (remotes && nremotes) {
176 		struct got_gitconfig_list *sections;
177 		size_t nalloc = 0;
178 		err = got_gitconfig_get_section_list(&sections, gitconfig);
179 		if (err)
180 			return err;
181 		TAILQ_FOREACH(node, &sections->fields, link) {
182 			if (strncasecmp("remote \"", node->field, 8) != 0)
183 				continue;
184 			nalloc++;
185 		}
186 
187 		*remotes = recallocarray(NULL, 0, nalloc, sizeof(**remotes));
188 		if (*remotes == NULL) {
189 			err = got_error_from_errno("recallocarray");
190 			goto done;
191 		}
192 
193 		i = 0;
194 		TAILQ_FOREACH(node, &sections->fields, link) {
195 			struct got_remote_repo *remote;
196 			char *name, *end, *mirror;
197 			const char *fetch_url, *send_url;
198 
199 			if (strncasecmp("remote \"", node->field, 8) != 0)
200 				continue;
201 
202 			remote = &(*remotes)[i];
203 
204 			name = strdup(node->field + 8);
205 			if (name == NULL) {
206 				err = got_error_from_errno("strdup");
207 				goto done;
208 			}
209 			end = strrchr(name, '"');
210 			if (end)
211 				*end = '\0';
212 			remote->name = name;
213 
214 			fetch_url = got_gitconfig_get_str(gitconfig,
215 			    node->field, "url");
216 			if (fetch_url == NULL) {
217 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
218 				free(remote->name);
219 				remote->name = NULL;
220 				goto done;
221 			}
222 			remote->fetch_url = strdup(fetch_url);
223 			if (remote->fetch_url == NULL) {
224 				err = got_error_from_errno("strdup");
225 				free(remote->name);
226 				remote->name = NULL;
227 				goto done;
228 			}
229 
230 			send_url = got_gitconfig_get_str(gitconfig,
231 			    node->field, "pushurl");
232 			if (send_url == NULL)
233 				send_url = got_gitconfig_get_str(gitconfig,
234 				    node->field, "url");
235 			if (send_url == NULL) {
236 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
237 				free(remote->name);
238 				remote->name = NULL;
239 				free(remote->fetch_url);
240 				remote->fetch_url = NULL;
241 				goto done;
242 			}
243 			remote->send_url = strdup(send_url);
244 			if (remote->send_url == NULL) {
245 				err = got_error_from_errno("strdup");
246 				free(remote->name);
247 				remote->name = NULL;
248 				free(remote->fetch_url);
249 				remote->fetch_url = NULL;
250 				goto done;
251 			}
252 
253 			remote->mirror_references = 0;
254 			mirror = got_gitconfig_get_str(gitconfig, node->field,
255 			    "mirror");
256 			if (mirror != NULL && get_boolean_val(mirror))
257 				remote->mirror_references = 1;
258 
259 			i++;
260 			(*nremotes)++;
261 		}
262 	}
263 done:
264 	if (fd != -1)
265 		close(fd);
266 	if (gitconfig)
267 		got_gitconfig_close(gitconfig);
268 	if (err) {
269 		if (extnames && extvals && nextensions) {
270 			for (i = 0; i < (*nextensions); i++) {
271 				free((*extnames)[i]);
272 				free((*extvals)[i]);
273 			}
274 			free(*extnames);
275 			*extnames = NULL;
276 			free(*extvals);
277 			*extvals = NULL;
278 			*nextensions = 0;
279 		}
280 		if (remotes && nremotes) {
281 			for (i = 0; i < (*nremotes); i++) {
282 				struct got_remote_repo *remote;
283 				remote = &(*remotes)[i];
284 				free(remote->name);
285 				free(remote->fetch_url);
286 				free(remote->send_url);
287 			}
288 			free(*remotes);
289 			*remotes = NULL;
290 			*nremotes = 0;
291 		}
292 	}
293 	return err;
294 }