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 <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 "got_path_priv.h"
28 
29 struct got_repository {
30 	char *path;
31 };
32 
33 #define GOT_GIT_DIR	".git"
34 
35 /* Mandatory files and directories inside the git directory. */
36 #define GOT_OBJECTS_DIR		"objects"
37 #define GOT_REFS_DIR		"refs"
38 #define GOT_HEAD_FILE		"HEAD"
39 
40 /* Other files and directories inside the git directory. */
41 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
42 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
43 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
44 
45 char *
46 got_repo_get_path_git_dir(struct got_repository *repo)
47 {
48 	char *path_git;
49 	
50 	if (asprintf(&path_git, "%s/%s", repo->path, GOT_GIT_DIR) == -1)
51 		return NULL;
52 
53 	return path_git;
54 }
55 
56 static char *
57 get_path_git_child(struct got_repository *repo, const char *basename)
58 {
59 	char *path_child;
60 	
61 	if (asprintf(&path_child, "%s/%s/%s", repo->path, GOT_GIT_DIR,
62 	    basename) == -1)
63 		return NULL;
64 
65 	return path_child;
66 }
67 
68 char *
69 got_repo_get_path_objects(struct got_repository *repo)
70 {
71 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
72 }
73 
74 char *
75 got_repo_get_path_objects_pack(struct got_repository *repo)
76 {
77 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
78 }
79 
80 char *
81 got_repo_get_path_refs(struct got_repository *repo)
82 {
83 	return get_path_git_child(repo, GOT_REFS_DIR);
84 }
85 
86 static char *
87 get_path_head(struct got_repository *repo)
88 {
89 	return get_path_git_child(repo, GOT_HEAD_FILE);
90 }
91 
92 static int
93 is_git_repo(struct got_repository *repo)
94 {
95 	char *path_git = got_repo_get_path_git_dir(repo);
96 	char *path_objects = got_repo_get_path_objects(repo);
97 	char *path_refs = got_repo_get_path_refs(repo);
98 	char *path_head = get_path_head(repo);
99 	int ret;
100 
101 	ret = (path_git != NULL) && (path_objects != NULL) &&
102 	    (path_refs != NULL) && (path_head != NULL);
103 
104 	free(path_git);
105 	free(path_objects);
106 	free(path_refs);
107 	free(path_head);
108 	return ret;
109 
110 }
111 
112 const struct got_error *
113 got_repo_open(struct got_repository **ret, const char *path)
114 {
115 	struct got_repository *repo = NULL;
116 	const struct got_error *err = NULL;
117 	char *abspath = got_path_get_absolute(path);
118 
119 	if (abspath == NULL)
120 		return got_error(GOT_ERR_BAD_PATH);
121 
122 	repo = calloc(1, sizeof(*repo));
123 	if (repo == NULL) {
124 		err = got_error(GOT_ERR_NO_MEM);
125 		goto done;
126 	}
127 
128 	repo->path = got_path_normalize(abspath);
129 	if (repo->path == NULL) {
130 		err = got_error(GOT_ERR_BAD_PATH);
131 		goto done;
132 	}
133 
134 	if (!is_git_repo(repo)) {
135 		err = got_error(GOT_ERR_NOT_GIT_REPO);
136 		goto done;
137 	}
138 		
139 	*ret = repo;
140 done:
141 	if (err)
142 		free(repo);
143 	free(abspath);
144 	return err;
145 }
146 
147 void
148 got_repo_close(struct got_repository *repo)
149 {
150 	free(repo->path);
151 	free(repo);
152 }