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 /*
18  * State information for a tracked file in a work tree.
19  * When written to disk, multi-byte fields are written in big-endian.
20  * Some fields are based on results from stat(2). These are only used in
21  * order to detect modifications made to on-disk files, they are never
22  * applied back to the filesystem.
23  */
24 struct got_fileindex_entry {
25 	TAILQ_ENTRY(got_fileindex_entry) entry;
26 	uint64_t ctime_sec;
27 	uint64_t ctime_nsec;
28 	uint64_t mtime_sec;
29 	uint64_t mtime_nsec;
30 	uint32_t uid;
31 	uint32_t gid;
32 	/*
33 	 * On-disk size is truncated to the lower 32 bits.
34 	 * The value is only used to check for modifications anyway.
35 	 */
36 	uint32_t size;
37 
38 	uint16_t mode;
39 #define GOT_INDEX_ENTRY_MODE_FILE_TYPE		0x000f
40 #define GOT_INDEX_ENTRY_MODE_REGULAR_FILE	1
41 #define GOT_INDEX_ENTRY_MODE_SYMLINK		2
42 #define GOT_INDEX_ENTRY_MODE_PERMS		0xff10
43 #define GOT_INDEX_ENTRY_MODE_PERMS_SHIFT	4
44 
45 	/* SHA1 of corresponding blob in repository. */
46 	uint8_t blob_sha1[SHA1_DIGEST_LENGTH];
47 
48 	/* SHA1 of corresponding base commit in repository. */
49 	uint8_t commit_sha1[SHA1_DIGEST_LENGTH];
50 
51 	uint32_t flags;
52 #define GOT_INDEX_ENTRY_F_PATH_LEN	0x00000fff
53 #define GOT_INDEX_ENTRY_F_STAGE		0x00003000
54 #define GOT_INDEX_ENTRY_F_EXTENDED	0x00004000
55 #define GOT_INDEX_ENTRY_F_ASSUME_VALID	0x00008000
56 
57 	/*
58 	 * UNIX-style path, relative to work tree root.
59 	 * Variable length, and NUL-padded to a multiple of 8 on disk.
60 	 */
61 	char *path;
62 
63 	/* More data could be here if F_EXTENDED is set; To be determined... */
64 };
65 
66 /* "Stages" of a file afflicted by a 3-way merge conflict. */
67 #define GOT_INDEX_ENTRY_STAGE_MERGED	0
68 #define GOT_INDEX_ENTRY_STAGE_ANCESTOR	1
69 #define GOT_INDEX_ENTRY_STAGE_OURS	2
70 #define GOT_INDEX_ENTRY_STAGE_THEIRS	3
71 
72 struct got_fileindex {
73 	uint32_t nentries;
74 	TAILQ_HEAD(, got_fileindex_entry) entries;
75 };
76 
77 /* On-disk file index header structure. */
78 struct got_fileindex_hdr {
79 	uint32_t signature;	/* big-endian */
80 #define GOT_FILE_INDEX_SIGNATURE	0x676f7449 /* 'g', 'o', 't', 'I' */
81 	uint32_t version;	/* big-endian */
82 #define GOT_FILE_INDEX_VERSION	1
83 	uint32_t nentries;	/* big-endian */
84 	/* list of concatenated fileindex entries */
85 	uint8_t sha1[SHA1_DIGEST_LENGTH]; /* checksum of above on-disk data */
86 };
87 
88 const struct got_error *got_fileindex_entry_update(struct got_fileindex_entry *,
89     const char *, uint8_t *, uint8_t *);
90 const struct got_error *got_fileindex_entry_alloc(struct got_fileindex_entry **,
91     const char *, const char *, uint8_t *, uint8_t *);
92 void got_fileindex_entry_free(struct got_fileindex_entry *);
93 struct got_fileindex *got_fileindex_alloc(void);
94 void got_fileindex_free(struct got_fileindex *);
95 const struct got_error *got_fileindex_write(struct got_fileindex *, FILE *);
96 const struct got_error *got_fileindex_entry_add(struct got_fileindex *,
97     struct got_fileindex_entry *);
98 void got_fileindex_entry_remove(struct got_fileindex *,
99     struct got_fileindex_entry *);
100 struct got_fileindex_entry *got_fileindex_entry_get(struct got_fileindex *,
101     const char *);
102 const struct got_error *got_fileindex_read(struct got_fileindex *, FILE *);
103 const struct got_error *got_fileindex_for_each_entry_safe(
104     struct got_fileindex *,
105     const struct got_error *(cb)(void *, struct got_fileindex_entry *), void *);