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