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 **objectformat,
59     char ***extensions, int *nextensions,
60     const char *gitconfig_path)
61 {
62 	const struct got_error *err = NULL;
63 	struct got_gitconfig *gitconfig = NULL;
64 	struct got_gitconfig_list *tags;
65 	struct got_gitconfig_list_node *node;
66 	int fd, i;
67 	const char *author, *email, *owner;
68 
69 	*gitconfig_repository_format_version = 0;
70 	if (extensions)
71 		*extensions = 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 (extensions && 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 		*extensions = calloc(numext, sizeof(char *));
108 		if (*extensions == NULL) {
109 			err = got_error_from_errno("calloc");
110 			goto done;
111 		}
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 				char *extstr = strdup(ext);
118 				if (extstr == NULL) {
119 					err = got_error_from_errno("strdup");
120 					goto done;
121 				}
122 				(*extensions)[(*nextensions)] = extstr;
123 				(*nextensions)++;
124 			}
125 			if (objectformat && !strcmp(ext, "sha256")) {
126 				free(*objectformat);
127 				*objectformat = strdup(val);
128 				if (*objectformat == NULL) {
129 					err = got_error_from_errno("strdup");
130 					goto done;
131 				}
132 			}
133 		}
134 	}
135 
136 	author = got_gitconfig_get_str(gitconfig, "user", "name");
137 	if (author) {
138 		*gitconfig_author_name = strdup(author);
139 		if (*gitconfig_author_name == NULL) {
140 			err = got_error_from_errno("strdup");
141 			goto done;
142 		}
143 	}
144 
145 	email = got_gitconfig_get_str(gitconfig, "user", "email");
146 	if (email) {
147 		*gitconfig_author_email = strdup(email);
148 		if (*gitconfig_author_email == NULL) {
149 			err = got_error_from_errno("strdup");
150 			goto done;
151 		}
152 	}
153 
154 	if (gitconfig_owner) {
155 		owner = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
156 		if (owner == NULL)
157 			owner = got_gitconfig_get_str(gitconfig, "gitweb",
158 			    "owner");
159 		if (owner) {
160 			*gitconfig_owner = strdup(owner);
161 			if (*gitconfig_owner == NULL) {
162 				err = got_error_from_errno("strdup");
163 				goto done;
164 			}
165 
166 		}
167 	}
168 
169 	if (remotes && nremotes) {
170 		struct got_gitconfig_list *sections;
171 		size_t nalloc = 0;
172 		err = got_gitconfig_get_section_list(&sections, gitconfig);
173 		if (err)
174 			return err;
175 		TAILQ_FOREACH(node, &sections->fields, link) {
176 			if (strncasecmp("remote \"", node->field, 8) != 0)
177 				continue;
178 			nalloc++;
179 		}
180 
181 		*remotes = recallocarray(NULL, 0, nalloc, sizeof(**remotes));
182 		if (*remotes == NULL) {
183 			err = got_error_from_errno("recallocarray");
184 			goto done;
185 		}
186 
187 		i = 0;
188 		TAILQ_FOREACH(node, &sections->fields, link) {
189 			struct got_remote_repo *remote;
190 			char *name, *end, *mirror;
191 			const char *fetch_url, *send_url;
192 
193 			if (strncasecmp("remote \"", node->field, 8) != 0)
194 				continue;
195 
196 			remote = &(*remotes)[i];
197 
198 			name = strdup(node->field + 8);
199 			if (name == NULL) {
200 				err = got_error_from_errno("strdup");
201 				goto done;
202 			}
203 			end = strrchr(name, '"');
204 			if (end)
205 				*end = '\0';
206 			remote->name = name;
207 
208 			fetch_url = got_gitconfig_get_str(gitconfig,
209 			    node->field, "url");
210 			if (fetch_url == NULL) {
211 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
212 				free(remote->name);
213 				remote->name = NULL;
214 				goto done;
215 			}
216 			remote->fetch_url = strdup(fetch_url);
217 			if (remote->fetch_url == NULL) {
218 				err = got_error_from_errno("strdup");
219 				free(remote->name);
220 				remote->name = NULL;
221 				goto done;
222 			}
223 
224 			send_url = got_gitconfig_get_str(gitconfig,
225 			    node->field, "pushurl");
226 			if (send_url == NULL)
227 				send_url = got_gitconfig_get_str(gitconfig,
228 				    node->field, "url");
229 			if (send_url == NULL) {
230 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
231 				free(remote->name);
232 				remote->name = NULL;
233 				free(remote->fetch_url);
234 				remote->fetch_url = NULL;
235 				goto done;
236 			}
237 			remote->send_url = strdup(send_url);
238 			if (remote->send_url == NULL) {
239 				err = got_error_from_errno("strdup");
240 				free(remote->name);
241 				remote->name = NULL;
242 				free(remote->fetch_url);
243 				remote->fetch_url = NULL;
244 				goto done;
245 			}
246 
247 			remote->mirror_references = 0;
248 			mirror = got_gitconfig_get_str(gitconfig, node->field,
249 			    "mirror");
250 			if (mirror != NULL && get_boolean_val(mirror))
251 				remote->mirror_references = 1;
252 
253 			i++;
254 			(*nremotes)++;
255 		}
256 	}
257 done:
258 	if (fd != -1)
259 		close(fd);
260 	if (gitconfig)
261 		got_gitconfig_close(gitconfig);
262 	if (err) {
263 		if (extensions && nextensions) {
264 			for (i = 0; i < (*nextensions); i++)
265 				free((*extensions)[i]);
266 			free(*extensions);
267 			*extensions = NULL;
268 			*nextensions = 0;
269 		}
270 		if (remotes && nremotes) {
271 			for (i = 0; i < (*nremotes); i++) {
272 				struct got_remote_repo *remote;
273 				remote = &(*remotes)[i];
274 				free(remote->name);
275 				free(remote->fetch_url);
276 				free(remote->send_url);
277 			}
278 			free(*remotes);
279 			*remotes = NULL;
280 			*nremotes = 0;
281 		}
282 	}
283 	return err;
284 }