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 
19 #include <limits.h>
20 #include <stdlib.h>
21 #include <stdio.h>
22 #include <sha1.h>
23 #include <string.h>
24 #include <zlib.h>
25 
26 #include "got_error.h"
27 #include "got_refs.h"
28 #include "got_repository.h"
29 
30 #include "got_path_lib.h"
31 #include "got_repository_lib.h"
32 #include "got_zbuf_lib.h"
33 #include "got_delta_lib.h"
34 #include "got_object_lib.h"
35 #include "got_pack_lib.h"
36 
37 #ifndef nitems
38 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
39 #endif
40 
41 #define GOT_GIT_DIR	".git"
42 
43 /* Mandatory files and directories inside the git directory. */
44 #define GOT_OBJECTS_DIR		"objects"
45 #define GOT_REFS_DIR		"refs"
46 #define GOT_HEAD_FILE		"HEAD"
47 
48 /* Other files and directories inside the git directory. */
49 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
50 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
51 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
52 
53 char *
54 got_repo_get_path(struct got_repository *repo)
55 {
56 	return strdup(repo->path);
57 }
58 
59 char *
60 got_repo_get_path_git_dir(struct got_repository *repo)
61 {
62 	char *path_git;
63 	
64 	if (asprintf(&path_git, "%s/%s", repo->path, GOT_GIT_DIR) == -1)
65 		return NULL;
66 
67 	return path_git;
68 }
69 
70 static char *
71 get_path_git_child(struct got_repository *repo, const char *basename)
72 {
73 	char *path_child;
74 	
75 	if (asprintf(&path_child, "%s/%s/%s", repo->path, GOT_GIT_DIR,
76 	    basename) == -1)
77 		return NULL;
78 
79 	return path_child;
80 }
81 
82 char *
83 got_repo_get_path_objects(struct got_repository *repo)
84 {
85 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
86 }
87 
88 char *
89 got_repo_get_path_objects_pack(struct got_repository *repo)
90 {
91 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
92 }
93 
94 char *
95 got_repo_get_path_refs(struct got_repository *repo)
96 {
97 	return get_path_git_child(repo, GOT_REFS_DIR);
98 }
99 
100 static char *
101 get_path_head(struct got_repository *repo)
102 {
103 	return get_path_git_child(repo, GOT_HEAD_FILE);
104 }
105 
106 static int
107 is_git_repo(struct got_repository *repo)
108 {
109 	char *path_git = got_repo_get_path_git_dir(repo);
110 	char *path_objects = got_repo_get_path_objects(repo);
111 	char *path_refs = got_repo_get_path_refs(repo);
112 	char *path_head = get_path_head(repo);
113 	int ret;
114 
115 	ret = (path_git != NULL) && (path_objects != NULL) &&
116 	    (path_refs != NULL) && (path_head != NULL);
117 
118 	free(path_git);
119 	free(path_objects);
120 	free(path_refs);
121 	free(path_head);
122 	return ret;
123 
124 }
125 
126 const struct got_error *
127 got_repo_open(struct got_repository **ret, const char *path)
128 {
129 	struct got_repository *repo = NULL;
130 	const struct got_error *err = NULL;
131 	char *abspath;
132 
133 	if (got_path_is_absolute(path))
134 		abspath = strdup(path);
135 	else
136 		abspath = got_path_get_absolute(path);
137 	if (abspath == NULL)
138 		return got_error(GOT_ERR_BAD_PATH);
139 
140 	repo = calloc(1, sizeof(*repo));
141 	if (repo == NULL) {
142 		err = got_error(GOT_ERR_NO_MEM);
143 		goto done;
144 	}
145 
146 	repo->path = got_path_normalize(abspath);
147 	if (repo->path == NULL) {
148 		err = got_error(GOT_ERR_BAD_PATH);
149 		goto done;
150 	}
151 
152 	if (!is_git_repo(repo)) {
153 		err = got_error(GOT_ERR_NOT_GIT_REPO);
154 		goto done;
155 	}
156 		
157 	*ret = repo;
158 done:
159 	if (err)
160 		free(repo);
161 	free(abspath);
162 	return err;
163 }
164 
165 void
166 got_repo_close(struct got_repository *repo)
167 {
168 	int i;
169 
170 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
171 		if (repo->packidx_cache[i] == NULL)
172 			break;
173 		got_packidx_close(repo->packidx_cache[i]);
174 	}
175 	free(repo->path);
176 	free(repo);
177 }