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_refs.h"
29 #include "got_repository.h"
30 
31 #include "got_path_lib.h"
32 #include "got_repository_lib.h"
33 #include "got_zbuf_lib.h"
34 #include "got_delta_lib.h"
35 #include "got_object_lib.h"
36 #include "got_pack_lib.h"
37 
38 #ifndef nitems
39 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
40 #endif
41 
42 #define GOT_GIT_DIR	".git"
43 
44 /* Mandatory files and directories inside the git directory. */
45 #define GOT_OBJECTS_DIR		"objects"
46 #define GOT_REFS_DIR		"refs"
47 #define GOT_HEAD_FILE		"HEAD"
48 
49 /* Other files and directories inside the git directory. */
50 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
51 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
52 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
53 
54 char *
55 got_repo_get_path(struct got_repository *repo)
56 {
57 	return strdup(repo->path);
58 }
59 
60 char *
61 got_repo_get_path_git_dir(struct got_repository *repo)
62 {
63 	char *path_git;
64 	
65 	if (asprintf(&path_git, "%s/%s", repo->path, GOT_GIT_DIR) == -1)
66 		return NULL;
67 
68 	return path_git;
69 }
70 
71 static char *
72 get_path_git_child(struct got_repository *repo, const char *basename)
73 {
74 	char *path_child;
75 	
76 	if (asprintf(&path_child, "%s/%s/%s", repo->path, GOT_GIT_DIR,
77 	    basename) == -1)
78 		return NULL;
79 
80 	return path_child;
81 }
82 
83 char *
84 got_repo_get_path_objects(struct got_repository *repo)
85 {
86 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
87 }
88 
89 char *
90 got_repo_get_path_objects_pack(struct got_repository *repo)
91 {
92 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
93 }
94 
95 char *
96 got_repo_get_path_refs(struct got_repository *repo)
97 {
98 	return get_path_git_child(repo, GOT_REFS_DIR);
99 }
100 
101 static char *
102 get_path_head(struct got_repository *repo)
103 {
104 	return get_path_git_child(repo, GOT_HEAD_FILE);
105 }
106 
107 static int
108 is_git_repo(struct got_repository *repo)
109 {
110 	char *path_git = got_repo_get_path_git_dir(repo);
111 	char *path_objects = got_repo_get_path_objects(repo);
112 	char *path_refs = got_repo_get_path_refs(repo);
113 	char *path_head = get_path_head(repo);
114 	int ret = 0;
115 	struct stat sb;
116 
117 	if (lstat(path_git, &sb) == -1)
118 		goto done;
119 	if (!S_ISDIR(sb.st_mode))
120 		goto done;
121 
122 	if (lstat(path_objects, &sb) == -1)
123 		goto done;
124 	if (!S_ISDIR(sb.st_mode))
125 		goto done;
126 
127 	if (lstat(path_refs, &sb) == -1)
128 		goto done;
129 	if (!S_ISDIR(sb.st_mode))
130 		goto done;
131 
132 	if (lstat(path_head, &sb) == -1)
133 		goto done;
134 	if (!S_ISREG(sb.st_mode))
135 		goto done;
136 	ret = 1;
137 done:
138 	free(path_git);
139 	free(path_objects);
140 	free(path_refs);
141 	free(path_head);
142 	return ret;
143 
144 }
145 
146 const struct got_error *
147 got_repo_open(struct got_repository **ret, const char *path)
148 {
149 	struct got_repository *repo = NULL;
150 	const struct got_error *err = NULL;
151 	char *abspath;
152 
153 	if (got_path_is_absolute(path))
154 		abspath = strdup(path);
155 	else
156 		abspath = got_path_get_absolute(path);
157 	if (abspath == NULL)
158 		return got_error(GOT_ERR_BAD_PATH);
159 
160 	repo = calloc(1, sizeof(*repo));
161 	if (repo == NULL) {
162 		err = got_error(GOT_ERR_NO_MEM);
163 		goto done;
164 	}
165 
166 	repo->path = got_path_normalize(abspath);
167 	if (repo->path == NULL) {
168 		err = got_error(GOT_ERR_BAD_PATH);
169 		goto done;
170 	}
171 
172 	if (!is_git_repo(repo)) {
173 		err = got_error(GOT_ERR_NOT_GIT_REPO);
174 		goto done;
175 	}
176 		
177 	*ret = repo;
178 done:
179 	if (err)
180 		free(repo);
181 	free(abspath);
182 	return err;
183 }
184 
185 void
186 got_repo_close(struct got_repository *repo)
187 {
188 	int i;
189 
190 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
191 		if (repo->packidx_cache[i] == NULL)
192 			break;
193 		got_packidx_close(repo->packidx_cache[i]);
194 	}
195 	free(repo->path);
196 	free(repo);
197 }