1 /*
2  * Copyright (c) 2017 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 <limits.h>
18 #include <stdlib.h>
19 #include <stdio.h>
20 #include <sha1.h>
21 #include <string.h>
22 
23 #include "got_error.h"
24 #include "got_refs.h"
25 #include "got_repository.h"
26 
27 #include "path.h"
28 
29 #define GOT_GIT_DIR	".git"
30 
31 /* Mandatory files and directories inside the git directory. */
32 #define GOT_OBJECTS_DIR		"objects"
33 #define GOT_REFS_DIR		"refs"
34 #define GOT_HEAD_FILE		"HEAD"
35 
36 /* Other files and directories inside the git directory. */
37 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
38 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
39 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
40 
41 char *
42 got_repo_get_path_git_dir(struct got_repository *repo)
43 {
44 	char *path_git;
45 	
46 	if (asprintf(&path_git, "%s/%s", repo->path, GOT_GIT_DIR) == -1)
47 		return NULL;
48 
49 	return path_git;
50 }
51 
52 static char *
53 get_path_git_child(struct got_repository *repo, const char *basename)
54 {
55 	char *path_child;
56 	
57 	if (asprintf(&path_child, "%s/%s/%s", repo->path, GOT_GIT_DIR,
58 	    basename) == -1)
59 		return NULL;
60 
61 	return path_child;
62 }
63 
64 char *
65 got_repo_get_path_objects(struct got_repository *repo)
66 {
67 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
68 }
69 
70 char *
71 got_repo_get_path_objects_pack(struct got_repository *repo)
72 {
73 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
74 }
75 
76 char *
77 got_repo_get_path_refs(struct got_repository *repo)
78 {
79 	return get_path_git_child(repo, GOT_REFS_DIR);
80 }
81 
82 static char *
83 get_path_head(struct got_repository *repo)
84 {
85 	return get_path_git_child(repo, GOT_HEAD_FILE);
86 }
87 
88 static int
89 is_git_repo(struct got_repository *repo)
90 {
91 	char *path_git = got_repo_get_path_git_dir(repo);
92 	char *path_objects = got_repo_get_path_objects(repo);
93 	char *path_refs = got_repo_get_path_refs(repo);
94 	char *path_head = get_path_head(repo);
95 	int ret;
96 
97 	ret = (path_git != NULL) && (path_objects != NULL) &&
98 	    (path_refs != NULL) && (path_head != NULL);
99 
100 	free(path_git);
101 	free(path_objects);
102 	free(path_refs);
103 	free(path_head);
104 	return ret;
105 
106 }
107 
108 const struct got_error *
109 got_repo_open(struct got_repository **ret, const char *path)
110 {
111 	struct got_repository *repo = NULL;
112 	const struct got_error *err = NULL;
113 	char *abspath = got_path_get_absolute(path);
114 
115 	if (abspath == NULL)
116 		return got_error(GOT_ERR_BAD_PATH);
117 
118 	repo = calloc(1, sizeof(*repo));
119 	if (repo == NULL) {
120 		err = got_error(GOT_ERR_NO_MEM);
121 		goto done;
122 	}
123 
124 	repo->path = got_path_normalize(abspath);
125 	if (repo->path == NULL) {
126 		err = got_error(GOT_ERR_BAD_PATH);
127 		goto done;
128 	}
129 
130 	if (!is_git_repo(repo)) {
131 		err = got_error(GOT_ERR_NOT_GIT_REPO);
132 		goto done;
133 	}
134 		
135 	*ret = repo;
136 done:
137 	if (err)
138 		free(repo);
139 	free(abspath);
140 	return err;
141 }
142 
143 void
144 got_repo_close(struct got_repository *repo)
145 {
146 	free(repo->path);
147 	free(repo);
148 }