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