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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 
21 #include <errno.h>
22 #include <event.h>
23 #include <fcntl.h>
24 #include <imsg.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 static int
54 skip_node(struct got_gitconfig *gitconfig,
55     struct got_gitconfig_list_node *node)
56 {
57 	/*
58 	 * Skip config nodes which do not describe remotes, and remotes
59 	 * which do not have a fetch URL defined (as used by git-annex).
60 	 */
61 	return (strncasecmp("remote \"", node->field, 8) != 0 ||
62 	    got_gitconfig_get_str(gitconfig, node->field, "url") == NULL);
63 }
64 
65 const struct got_error *
66 got_repo_read_gitconfig(int *gitconfig_repository_format_version,
67     char **gitconfig_author_name, char **gitconfig_author_email,
68     struct got_remote_repo **remotes, int *nremotes,
69     char **gitconfig_owner, char ***extnames, char ***extvals,
70     int *nextensions, const char *gitconfig_path)
71 {
72 	const struct got_error *err = NULL;
73 	struct got_gitconfig *gitconfig = NULL;
74 	struct got_gitconfig_list *tags;
75 	struct got_gitconfig_list_node *node;
76 	int fd, i;
77 	const char *author, *email, *owner;
78 
79 	*gitconfig_repository_format_version = 0;
80 	if (extnames)
81 		*extnames = NULL;
82 	if (extvals)
83 		*extvals = NULL;
84 	if (nextensions)
85 		*nextensions = 0;
86 	*gitconfig_author_name = NULL;
87 	*gitconfig_author_email = NULL;
88 	if (remotes)
89 		*remotes = NULL;
90 	if (nremotes)
91 		*nremotes = 0;
92 	if (gitconfig_owner)
93 		*gitconfig_owner = NULL;
94 
95 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
96 	if (fd == -1) {
97 		if (errno == ENOENT)
98 			return NULL;
99 		return got_error_from_errno2("open", gitconfig_path);
100 	}
101 
102 	err = got_gitconfig_open(&gitconfig, fd);
103 	if (err)
104 		goto done;
105 
106 	*gitconfig_repository_format_version = got_gitconfig_get_num(gitconfig,
107 	    "core", "repositoryformatversion", 0);
108 
109 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");
110 	if (extnames && extvals && nextensions && tags) {
111 		size_t numext = 0;
112 		TAILQ_FOREACH(node, &tags->fields, link) {
113 			char *ext = node->field;
114 			char *val = got_gitconfig_get_str(gitconfig,
115 			    "extensions", ext);
116 			if (get_boolean_val(val))
117 				numext++;
118 		}
119 		*extnames = calloc(numext, sizeof(char *));
120 		if (*extnames == NULL) {
121 			err = got_error_from_errno("calloc");
122 			goto done;
123 		}
124 		*extvals = calloc(numext, sizeof(char *));
125 		if (*extvals == NULL) {
126 			err = got_error_from_errno("calloc");
127 			goto done;
128 		}
129 		TAILQ_FOREACH(node, &tags->fields, link) {
130 			char *ext = node->field;
131 			char *val = got_gitconfig_get_str(gitconfig,
132 			    "extensions", ext);
133 			if (get_boolean_val(val)) {
134 				char *extstr = NULL, *valstr = NULL;
135 
136 				extstr = strdup(ext);
137 				if (extstr == NULL) {
138 					err = got_error_from_errno("strdup");
139 					goto done;
140 				}
141 				valstr = strdup(val);
142 				if (valstr == NULL) {
143 					err = got_error_from_errno("strdup");
144 					goto done;
145 				}
146 				(*extnames)[(*nextensions)] = extstr;
147 				(*extvals)[(*nextensions)] = valstr;
148 				(*nextensions)++;
149 			}
150 		}
151 	}
152 
153 	author = got_gitconfig_get_str(gitconfig, "user", "name");
154 	if (author) {
155 		*gitconfig_author_name = strdup(author);
156 		if (*gitconfig_author_name == NULL) {
157 			err = got_error_from_errno("strdup");
158 			goto done;
159 		}
160 	}
161 
162 	email = got_gitconfig_get_str(gitconfig, "user", "email");
163 	if (email) {
164 		*gitconfig_author_email = strdup(email);
165 		if (*gitconfig_author_email == NULL) {
166 			err = got_error_from_errno("strdup");
167 			goto done;
168 		}
169 	}
170 
171 	if (gitconfig_owner) {
172 		owner = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
173 		if (owner == NULL)
174 			owner = got_gitconfig_get_str(gitconfig, "gitweb",
175 			    "owner");
176 		if (owner) {
177 			*gitconfig_owner = strdup(owner);
178 			if (*gitconfig_owner == NULL) {
179 				err = got_error_from_errno("strdup");
180 				goto done;
181 			}
182 
183 		}
184 	}
185 
186 	if (remotes && nremotes) {
187 		struct got_gitconfig_list *sections;
188 		size_t nalloc = 0;
189 		err = got_gitconfig_get_section_list(&sections, gitconfig);
190 		if (err)
191 			return err;
192 		TAILQ_FOREACH(node, &sections->fields, link) {
193 			if (skip_node(gitconfig, node))
194 				continue;
195 			nalloc++;
196 		}
197 
198 		*remotes = recallocarray(NULL, 0, nalloc, sizeof(**remotes));
199 		if (*remotes == NULL) {
200 			err = got_error_from_errno("recallocarray");
201 			goto done;
202 		}
203 
204 		i = 0;
205 		TAILQ_FOREACH(node, &sections->fields, link) {
206 			struct got_remote_repo *remote;
207 			char *name, *end, *mirror;
208 			const char *fetch_url, *send_url;
209 
210 			if (skip_node(gitconfig, node) != 0)
211 				continue;
212 
213 			remote = &(*remotes)[i];
214 
215 			name = strdup(node->field + 8);
216 			if (name == NULL) {
217 				err = got_error_from_errno("strdup");
218 				goto done;
219 			}
220 			end = strrchr(name, '"');
221 			if (end)
222 				*end = '\0';
223 			remote->name = name;
224 
225 			fetch_url = got_gitconfig_get_str(gitconfig,
226 			    node->field, "url");
227 			remote->fetch_url = strdup(fetch_url);
228 			if (remote->fetch_url == NULL) {
229 				err = got_error_from_errno("strdup");
230 				free(remote->name);
231 				remote->name = NULL;
232 				goto done;
233 			}
234 
235 			send_url = got_gitconfig_get_str(gitconfig,
236 			    node->field, "pushurl");
237 			if (send_url == NULL)
238 				send_url = got_gitconfig_get_str(gitconfig,
239 				    node->field, "url");
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 }