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 #define GOT_GIT_DIR	".git"
18 
19 /* Mandatory files and directories inside the git directory. */
20 #define GOT_OBJECTS_DIR		"objects"
21 #define GOT_REFS_DIR		"refs"
22 #define GOT_HEAD_FILE		"HEAD"
23 #define GOT_GITCONFIG		"config"
24 
25 /* Other files and directories inside the git directory. */
26 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
27 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
28 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
29 #define GOT_PACKED_REFS_FILE	"packed-refs"
30 
31 #define GOT_PACK_CACHE_SIZE	64
32 
33 struct got_repository {
34 	char *path;
35 	char *path_git_dir;
36 	int gitdir_fd;
37 
38 	/* The pack index cache speeds up search for packed objects. */
39 	struct got_packidx *packidx_cache[GOT_PACK_CACHE_SIZE];
40 
41 	/* Open file handles for pack files. */
42 	struct got_pack packs[GOT_PACK_CACHE_SIZE];
43 
44 	/*
45 	 * The cache size limit may be lower than GOT_PACK_CACHE_SIZE,
46 	 * depending on resource limits.
47 	 */
48 	int pack_cache_size;
49 
50 	/* Handles to child processes for reading loose objects. */
51 	struct got_privsep_child privsep_children[5];
52 #define GOT_REPO_PRIVSEP_CHILD_OBJECT	0
53 #define GOT_REPO_PRIVSEP_CHILD_COMMIT	1
54 #define GOT_REPO_PRIVSEP_CHILD_TREE	2
55 #define GOT_REPO_PRIVSEP_CHILD_BLOB	3
56 #define GOT_REPO_PRIVSEP_CHILD_TAG	4
57 
58 	/* Caches for open objects. */
59 	struct got_object_cache objcache;
60 	struct got_object_cache treecache;
61 	struct got_object_cache commitcache;
62 	struct got_object_cache tagcache;
63 
64 	/* Settings read from Git configuration files. */
65 	int gitconfig_repository_format_version;
66 	char *gitconfig_author_name;
67 	char *gitconfig_author_email;
68 	char *global_gitconfig_author_name;
69 	char *global_gitconfig_author_email;
70 	int ngitconfig_remotes;
71 	struct got_remote_repo *gitconfig_remotes;
72 	char *gitconfig_owner;
73 	char **extensions;
74 	int nextensions;
75 
76 	/* Settings read from got.conf. */
77 	struct got_gotconfig *gotconfig;
78 };
79 
80 const struct got_error*got_repo_cache_object(struct got_repository *,
81     struct got_object_id *, struct got_object *);
82 struct got_object *got_repo_get_cached_object(struct got_repository *,
83     struct got_object_id *);
84 const struct got_error*got_repo_cache_tree(struct got_repository *,
85     struct got_object_id *, struct got_tree_object *);
86 struct got_tree_object *got_repo_get_cached_tree(struct got_repository *,
87     struct got_object_id *);
88 const struct got_error*got_repo_cache_commit(struct got_repository *,
89     struct got_object_id *, struct got_commit_object *);
90 struct got_commit_object *got_repo_get_cached_commit(struct got_repository *,
91     struct got_object_id *);
92 const struct got_error*got_repo_cache_tag(struct got_repository *,
93     struct got_object_id *, struct got_tag_object *);
94 struct got_tag_object *got_repo_get_cached_tag(struct got_repository *,
95     struct got_object_id *);
96 int got_repo_is_packidx_filename(const char *, size_t);
97 const struct got_error *got_repo_search_packidx(struct got_packidx **, int *,
98     struct got_repository *, struct got_object_id *);
99 const struct got_error *got_repo_cache_pack(struct got_pack **,
100     struct got_repository *, const char *, struct got_packidx *);