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 ***extensions, int *nextensions,
56     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 (extensions)
67 		*extensions = NULL;
68 	if (nextensions)
69 		*nextensions = 0;
70 	*gitconfig_author_name = NULL;
71 	*gitconfig_author_email = NULL;
72 	if (remotes)
73 		*remotes = NULL;
74 	if (nremotes)
75 		*nremotes = 0;
76 	if (gitconfig_owner)
77 		*gitconfig_owner = NULL;
78 
79 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
80 	if (fd == -1) {
81 		if (errno == ENOENT)
82 			return NULL;
83 		return got_error_from_errno2("open", gitconfig_path);
84 	}
85 
86 	err = got_gitconfig_open(&gitconfig, fd);
87 	if (err)
88 		goto done;
89 
90 	*gitconfig_repository_format_version = got_gitconfig_get_num(gitconfig,
91 	    "core", "repositoryformatversion", 0);
92 
93 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");
94 	if (extensions && nextensions && tags) {
95 		size_t numext = 0;
96 		TAILQ_FOREACH(node, &tags->fields, link) {
97 			char *ext = node->field;
98 			char *val = got_gitconfig_get_str(gitconfig,
99 			    "extensions", ext);
100 			if (get_boolean_val(val))
101 				numext++;
102 		}
103 		*extensions = calloc(numext, sizeof(char *));
104 		if (*extensions == NULL) {
105 			err = got_error_from_errno("calloc");
106 			goto done;
107 		}
108 		TAILQ_FOREACH(node, &tags->fields, link) {
109 			char *ext = node->field;
110 			char *val = got_gitconfig_get_str(gitconfig,
111 			    "extensions", ext);
112 			if (get_boolean_val(val)) {
113 				char *extstr = strdup(ext);
114 				if (extstr == NULL) {
115 					err = got_error_from_errno("strdup");
116 					goto done;
117 				}
118 				(*extensions)[(*nextensions)] = extstr;
119 				(*nextensions)++;
120 			}
121 		}
122 	}
123 
124 	author = got_gitconfig_get_str(gitconfig, "user", "name");
125 	if (author) {
126 		*gitconfig_author_name = strdup(author);
127 		if (*gitconfig_author_name == NULL) {
128 			err = got_error_from_errno("strdup");
129 			goto done;
130 		}
131 	}
132 
133 	email = got_gitconfig_get_str(gitconfig, "user", "email");
134 	if (email) {
135 		*gitconfig_author_email = strdup(email);
136 		if (*gitconfig_author_email == NULL) {
137 			err = got_error_from_errno("strdup");
138 			goto done;
139 		}
140 	}
141 
142 	if (gitconfig_owner) {
143 		owner = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
144 		if (owner == NULL)
145 			owner = got_gitconfig_get_str(gitconfig, "gitweb",
146 			    "owner");
147 		if (owner) {
148 			*gitconfig_owner = strdup(owner);
149 			if (*gitconfig_owner == NULL) {
150 				err = got_error_from_errno("strdup");
151 				goto done;
152 			}
153 
154 		}
155 	}
156 
157 	if (remotes && nremotes) {
158 		struct got_gitconfig_list *sections;
159 		size_t nalloc = 0;
160 		err = got_gitconfig_get_section_list(&sections, gitconfig);
161 		if (err)
162 			return err;
163 		TAILQ_FOREACH(node, &sections->fields, link) {
164 			if (strncasecmp("remote \"", node->field, 8) != 0)
165 				continue;
166 			nalloc++;
167 		}
168 
169 		*remotes = recallocarray(NULL, 0, nalloc, sizeof(**remotes));
170 		if (*remotes == NULL) {
171 			err = got_error_from_errno("recallocarray");
172 			goto done;
173 		}
174 
175 		i = 0;
176 		TAILQ_FOREACH(node, &sections->fields, link) {
177 			struct got_remote_repo *remote;
178 			char *name, *end, *mirror;
179 			const char *fetch_url, *send_url;
180 
181 			if (strncasecmp("remote \"", node->field, 8) != 0)
182 				continue;
183 
184 			remote = &(*remotes)[i];
185 
186 			name = strdup(node->field + 8);
187 			if (name == NULL) {
188 				err = got_error_from_errno("strdup");
189 				goto done;
190 			}
191 			end = strrchr(name, '"');
192 			if (end)
193 				*end = '\0';
194 			remote->name = name;
195 
196 			fetch_url = got_gitconfig_get_str(gitconfig,
197 			    node->field, "url");
198 			if (fetch_url == NULL) {
199 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
200 				free(remote->name);
201 				remote->name = NULL;
202 				goto done;
203 			}
204 			remote->fetch_url = strdup(fetch_url);
205 			if (remote->fetch_url == NULL) {
206 				err = got_error_from_errno("strdup");
207 				free(remote->name);
208 				remote->name = NULL;
209 				goto done;
210 			}
211 
212 			send_url = got_gitconfig_get_str(gitconfig,
213 			    node->field, "pushurl");
214 			if (send_url == NULL)
215 				send_url = got_gitconfig_get_str(gitconfig,
216 				    node->field, "url");
217 			if (send_url == NULL) {
218 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
219 				free(remote->name);
220 				remote->name = NULL;
221 				free(remote->fetch_url);
222 				remote->fetch_url = NULL;
223 				goto done;
224 			}
225 			remote->send_url = strdup(send_url);
226 			if (remote->send_url == NULL) {
227 				err = got_error_from_errno("strdup");
228 				free(remote->name);
229 				remote->name = NULL;
230 				free(remote->fetch_url);
231 				remote->fetch_url = NULL;
232 				goto done;
233 			}
234 
235 			remote->mirror_references = 0;
236 			mirror = got_gitconfig_get_str(gitconfig, node->field,
237 			    "mirror");
238 			if (mirror != NULL && get_boolean_val(mirror))
239 				remote->mirror_references = 1;
240 
241 			i++;
242 			(*nremotes)++;
243 		}
244 	}
245 done:
246 	if (fd != -1)
247 		close(fd);
248 	if (gitconfig)
249 		got_gitconfig_close(gitconfig);
250 	if (err) {
251 		if (extensions && nextensions) {
252 			for (i = 0; i < (*nextensions); i++)
253 				free((*extensions)[i]);
254 			free(*extensions);
255 			*extensions = NULL;
256 			*nextensions = 0;
257 		}
258 		if (remotes && nremotes) {
259 			for (i = 0; i < (*nremotes); i++) {
260 				struct got_remote_repo *remote;
261 				remote = &(*remotes)[i];
262 				free(remote->name);
263 				free(remote->fetch_url);
264 				free(remote->send_url);
265 			}
266 			free(*remotes);
267 			*remotes = NULL;
268 			*nremotes = 0;
269 		}
270 	}
271 	return err;
272 }