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