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