1 /*
2  * Copyright (c) 2018 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/stat.h>
19 
20 #include <limits.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <sha1.h>
24 #include <string.h>
25 #include <zlib.h>
26 
27 #include "got_error.h"
28 #include "got_reference.h"
29 #include "got_repository.h"
30 #include "got_worktree.h"
31 
32 #include "got_lib_path.h"
33 #include "got_lib_delta.h"
34 #include "got_lib_zbuf.h"
35 #include "got_lib_object.h"
36 #include "got_lib_pack.h"
37 #include "got_lib_repository.h"
38 #include "got_lib_worktree.h"
39 
40 #ifndef nitems
41 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
42 #endif
43 
44 #define GOT_GIT_DIR	".git"
45 
46 /* Mandatory files and directories inside the git directory. */
47 #define GOT_OBJECTS_DIR		"objects"
48 #define GOT_REFS_DIR		"refs"
49 #define GOT_HEAD_FILE		"HEAD"
50 
51 /* Other files and directories inside the git directory. */
52 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
53 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
54 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
55 
56 char *
57 got_repo_get_path(struct got_repository *repo)
58 {
59 	return strdup(repo->path);
60 }
61 
62 char *
63 got_repo_get_path_git_dir(struct got_repository *repo)
64 {
65 	return strdup(repo->path_git_dir);
66 }
67 
68 static char *
69 get_path_git_child(struct got_repository *repo, const char *basename)
70 {
71 	char *path_child;
72 	
73 	if (asprintf(&path_child, "%s/%s", repo->path_git_dir,
74 	    basename) == -1)
75 		return NULL;
76 
77 	return path_child;
78 }
79 
80 char *
81 got_repo_get_path_objects(struct got_repository *repo)
82 {
83 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
84 }
85 
86 char *
87 got_repo_get_path_objects_pack(struct got_repository *repo)
88 {
89 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
90 }
91 
92 char *
93 got_repo_get_path_refs(struct got_repository *repo)
94 {
95 	return get_path_git_child(repo, GOT_REFS_DIR);
96 }
97 
98 static char *
99 get_path_head(struct got_repository *repo)
100 {
101 	return get_path_git_child(repo, GOT_HEAD_FILE);
102 }
103 
104 static int
105 is_git_repo(struct got_repository *repo)
106 {
107 	char *path_git = got_repo_get_path_git_dir(repo);
108 	char *path_objects = got_repo_get_path_objects(repo);
109 	char *path_refs = got_repo_get_path_refs(repo);
110 	char *path_head = get_path_head(repo);
111 	int ret = 0;
112 	struct stat sb;
113 	struct got_reference *head_ref;
114 
115 	if (lstat(path_git, &sb) == -1)
116 		goto done;
117 	if (!S_ISDIR(sb.st_mode))
118 		goto done;
119 
120 	if (lstat(path_objects, &sb) == -1)
121 		goto done;
122 	if (!S_ISDIR(sb.st_mode))
123 		goto done;
124 
125 	if (lstat(path_refs, &sb) == -1)
126 		goto done;
127 	if (!S_ISDIR(sb.st_mode))
128 		goto done;
129 
130 	if (lstat(path_head, &sb) == -1)
131 		goto done;
132 	if (!S_ISREG(sb.st_mode))
133 		goto done;
134 
135 	/* Check if the HEAD reference can be opened. */
136 	if (got_ref_open(&head_ref, repo, GOT_REF_HEAD) != NULL)
137 		goto done;
138 	got_ref_close(head_ref);
139 
140 	ret = 1;
141 done:
142 	free(path_git);
143 	free(path_objects);
144 	free(path_refs);
145 	free(path_head);
146 	return ret;
147 
148 }
149 
150 const struct got_error *
151 got_repo_open(struct got_repository **ret, const char *path)
152 {
153 	struct got_repository *repo = NULL;
154 	const struct got_error *err = NULL;
155 	char *abspath;
156 
157 	if (got_path_is_absolute(path))
158 		abspath = strdup(path);
159 	else
160 		abspath = got_path_get_absolute(path);
161 	if (abspath == NULL)
162 		return got_error(GOT_ERR_BAD_PATH);
163 
164 	repo = calloc(1, sizeof(*repo));
165 	if (repo == NULL) {
166 		err = got_error_from_errno();
167 		goto done;
168 	}
169 
170 	repo->path = got_path_normalize(abspath);
171 	if (repo->path == NULL) {
172 		err = got_error(GOT_ERR_BAD_PATH);
173 		goto done;
174 	}
175 
176 	repo->path_git_dir = strdup(repo->path);
177 	if (repo->path_git_dir == NULL) {
178 		err = got_error_from_errno();
179 		goto done;
180 	}
181 	if (!is_git_repo(repo)) {
182 		free(repo->path_git_dir);
183 		if (asprintf(&repo->path_git_dir, "%s/%s", repo->path,
184 		    GOT_GIT_DIR) == -1) {
185 			err = got_error_from_errno();
186 			goto done;
187 		}
188 		if (!is_git_repo(repo)) {
189 			struct got_worktree *worktree;
190 			if (got_worktree_open(&worktree, repo->path) == NULL) {
191 				free(repo->path_git_dir);
192 				repo->path_git_dir =
193 				    strdup(worktree->repo_path);
194 				if (repo->path_git_dir == NULL) {
195 					err = got_error_from_errno();
196 					goto done;
197 				}
198 				if (!is_git_repo(repo)) {
199 					free(repo->path_git_dir);
200 					if (asprintf(&repo->path_git_dir,
201 					    "%s/%s", worktree->repo_path,
202 					    GOT_GIT_DIR) == -1) {
203 						err = got_error_from_errno();
204 						goto done;
205 					}
206 				}
207 				got_worktree_close(worktree);
208 			}
209 		}
210 		if (!is_git_repo(repo)) {
211 			err = got_error(GOT_ERR_NOT_GIT_REPO);
212 			goto done;
213 		}
214 	}
215 		
216 	*ret = repo;
217 done:
218 	if (err)
219 		got_repo_close(repo);
220 	free(abspath);
221 	return err;
222 }
223 
224 void
225 got_repo_close(struct got_repository *repo)
226 {
227 	int i;
228 
229 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
230 		if (repo->packidx_cache[i] == NULL)
231 			break;
232 		got_packidx_close(repo->packidx_cache[i]);
233 	}
234 
235 	for (i = 0; i < nitems(repo->packs); i++) {
236 		if (repo->packs[i].path_packfile == NULL)
237 			break;
238 		got_pack_close(&repo->packs[i]);
239 	}
240 
241 	free(repo->path);
242 	free(repo->path_git_dir);
243 	free(repo);
244 }