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_packidx_bloom_filter {
34 	char path_packidx[PATH_MAX]; /* on-disk path */
35 	size_t path_packidx_len;
36 	struct bloom *bloom;
37 	STAILQ_ENTRY(got_packidx_bloom_filter) entry;
38 };
39 
40 STAILQ_HEAD(got_packidx_bloom_filter_head, got_packidx_bloom_filter);
41 
42 struct got_repository {
43 	char *path;
44 	char *path_git_dir;
45 	int gitdir_fd;
46 
47 	/* The pack index cache speeds up search for packed objects. */
48 	struct got_packidx *packidx_cache[GOT_PACK_CACHE_SIZE];
49 
50 	/*
51 	 * List of bloom filters for pack index files.
52 	 * Used to avoid opening a pack index in search of an
53 	 * object ID which is not contained in this pack index.
54 	 */
55 	struct got_packidx_bloom_filter_head packidx_bloom_filters;
56 
57 	/* Open file handles for pack files. */
58 	struct got_pack packs[GOT_PACK_CACHE_SIZE];
59 
60 	/*
61 	 * The cache size limit may be lower than GOT_PACK_CACHE_SIZE,
62 	 * depending on resource limits.
63 	 */
64 	int pack_cache_size;
65 
66 	/* Handles to child processes for reading loose objects. */
67 	struct got_privsep_child privsep_children[5];
68 #define GOT_REPO_PRIVSEP_CHILD_OBJECT	0
69 #define GOT_REPO_PRIVSEP_CHILD_COMMIT	1
70 #define GOT_REPO_PRIVSEP_CHILD_TREE	2
71 #define GOT_REPO_PRIVSEP_CHILD_BLOB	3
72 #define GOT_REPO_PRIVSEP_CHILD_TAG	4
73 
74 	/* Caches for open objects. */
75 	struct got_object_cache objcache;
76 	struct got_object_cache treecache;
77 	struct got_object_cache commitcache;
78 	struct got_object_cache tagcache;
79 
80 	/* Settings read from Git configuration files. */
81 	int gitconfig_repository_format_version;
82 	char *gitconfig_author_name;
83 	char *gitconfig_author_email;
84 	char *global_gitconfig_author_name;
85 	char *global_gitconfig_author_email;
86 	int ngitconfig_remotes;
87 	struct got_remote_repo *gitconfig_remotes;
88 	char *gitconfig_owner;
89 	char **extensions;
90 	int nextensions;
91 
92 	/* Settings read from got.conf. */
93 	struct got_gotconfig *gotconfig;
94 };
95 
96 const struct got_error*got_repo_cache_object(struct got_repository *,
97     struct got_object_id *, struct got_object *);
98 struct got_object *got_repo_get_cached_object(struct got_repository *,
99     struct got_object_id *);
100 const struct got_error*got_repo_cache_tree(struct got_repository *,
101     struct got_object_id *, struct got_tree_object *);
102 struct got_tree_object *got_repo_get_cached_tree(struct got_repository *,
103     struct got_object_id *);
104 const struct got_error*got_repo_cache_commit(struct got_repository *,
105     struct got_object_id *, struct got_commit_object *);
106 struct got_commit_object *got_repo_get_cached_commit(struct got_repository *,
107     struct got_object_id *);
108 const struct got_error*got_repo_cache_tag(struct got_repository *,
109     struct got_object_id *, struct got_tag_object *);
110 struct got_tag_object *got_repo_get_cached_tag(struct got_repository *,
111     struct got_object_id *);
112 int got_repo_is_packidx_filename(const char *, size_t);
113 const struct got_error *got_repo_search_packidx(struct got_packidx **, int *,
114     struct got_repository *, struct got_object_id *);
115 const struct got_error *got_repo_cache_pack(struct got_pack **,
116     struct got_repository *, const char *, struct got_packidx *);