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_priv.h"
31 #include "got_repository_priv.h"
32 #include "got_zb_priv.h"
33 #include "got_delta_priv.h"
34 #include "got_object_priv.h"
35 #include "got_pack_priv.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_git_dir(struct got_repository *repo)
55 {
56 	char *path_git;
57 	
58 	if (asprintf(&path_git, "%s/%s", repo->path, GOT_GIT_DIR) == -1)
59 		return NULL;
60 
61 	return path_git;
62 }
63 
64 static char *
65 get_path_git_child(struct got_repository *repo, const char *basename)
66 {
67 	char *path_child;
68 	
69 	if (asprintf(&path_child, "%s/%s/%s", repo->path, GOT_GIT_DIR,
70 	    basename) == -1)
71 		return NULL;
72 
73 	return path_child;
74 }
75 
76 char *
77 got_repo_get_path_objects(struct got_repository *repo)
78 {
79 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
80 }
81 
82 char *
83 got_repo_get_path_objects_pack(struct got_repository *repo)
84 {
85 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
86 }
87 
88 char *
89 got_repo_get_path_refs(struct got_repository *repo)
90 {
91 	return get_path_git_child(repo, GOT_REFS_DIR);
92 }
93 
94 static char *
95 get_path_head(struct got_repository *repo)
96 {
97 	return get_path_git_child(repo, GOT_HEAD_FILE);
98 }
99 
100 static int
101 is_git_repo(struct got_repository *repo)
102 {
103 	char *path_git = got_repo_get_path_git_dir(repo);
104 	char *path_objects = got_repo_get_path_objects(repo);
105 	char *path_refs = got_repo_get_path_refs(repo);
106 	char *path_head = get_path_head(repo);
107 	int ret;
108 
109 	ret = (path_git != NULL) && (path_objects != NULL) &&
110 	    (path_refs != NULL) && (path_head != NULL);
111 
112 	free(path_git);
113 	free(path_objects);
114 	free(path_refs);
115 	free(path_head);
116 	return ret;
117 
118 }
119 
120 const struct got_error *
121 got_repo_open(struct got_repository **ret, const char *path)
122 {
123 	struct got_repository *repo = NULL;
124 	const struct got_error *err = NULL;
125 	char *abspath;
126 
127 	if (got_path_is_absolute(path))
128 		abspath = strdup(path);
129 	else
130 		abspath = got_path_get_absolute(path);
131 	if (abspath == NULL)
132 		return got_error(GOT_ERR_BAD_PATH);
133 
134 	repo = calloc(1, sizeof(*repo));
135 	if (repo == NULL) {
136 		err = got_error(GOT_ERR_NO_MEM);
137 		goto done;
138 	}
139 
140 	repo->path = got_path_normalize(abspath);
141 	if (repo->path == NULL) {
142 		err = got_error(GOT_ERR_BAD_PATH);
143 		goto done;
144 	}
145 
146 	if (!is_git_repo(repo)) {
147 		err = got_error(GOT_ERR_NOT_GIT_REPO);
148 		goto done;
149 	}
150 		
151 	*ret = repo;
152 done:
153 	if (err)
154 		free(repo);
155 	free(abspath);
156 	return err;
157 }
158 
159 void
160 got_repo_close(struct got_repository *repo)
161 {
162 	int i;
163 
164 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
165 		if (repo->packidx_cache[i] == NULL)
166 			break;
167 		got_packidx_close(repo->packidx_cache[i]);
168 	}
169 	free(repo->path);
170 	free(repo);
171 }