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