git@vger.kernel.org list mirror (unofficial, one of many)
 help / color / Atom feed
50908d1f2ddca9c8b16d093baa3a36cefe351464 blob 4518 bytes (raw)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
 
#ifndef PACK_OBJECTS_H
#define PACK_OBJECTS_H

#define OE_DFS_STATE_BITS	2
#define OE_DEPTH_BITS		12

/*
 * State flags for depth-first search used for analyzing delta cycles.
 *
 * The depth is measured in delta-links to the base (so if A is a delta
 * against B, then A has a depth of 1, and B a depth of 0).
 */
enum dfs_state {
	DFS_NONE = 0,
	DFS_ACTIVE,
	DFS_DONE,
	DFS_NUM_STATES
};

/*
 * basic object info
 * -----------------
 * idx.oid is filled up before delta searching starts. idx.crc32 and
 * is only valid after the object is written out and will be used for
 * generating the index. idx.offset will be both gradually set and
 * used in writing phase (base objects get offset first, then deltas
 * refer to them)
 *
 * "size" is the uncompressed object size. Compressed size is not
 * cached (ie. raw data in a pack) but available via revindex.
 *
 * "hash" contains a path name hash which is used for sorting the
 * delta list and also during delta searching. Once prepare_pack()
 * returns it's no longer needed.
 *
 * source pack info
 * ----------------
 * The (in_pack, in_pack_offset, in_pack_header_size) tuple contains
 * the location of the object in the source pack, with or without
 * header.
 *
 * "type" and "in_pack_type" both describe object type. in_pack_type
 * may contain a delta type, while type is always the canonical type.
 *
 * deltas
 * ------
 * Delta links (delta, delta_child and delta_sibling) are created
 * reflect that delta graph from the source pack then updated or added
 * during delta searching phase when we find better deltas.
 *
 * delta_child and delta_sibling are last needed in
 * compute_write_order(). "delta" and "delta_size" must remain valid
 * at object writing phase in case the delta is not cached.
 *
 * If a delta is cached in memory and is compressed delta_data points
 * to the data and z_delta_size contains the compressed size. If it's
 * uncompressed [1], z_delta_size must be zero. delta_size is always
 * the uncompressed size and must be valid even if the delta is not
 * cached.
 *
 * [1] during try_delta phase we don't bother with compressing because
 * the delta could be quickly replaced with a better one.
 */
struct object_entry {
	struct pack_idx_entry idx;
	unsigned long size;	/* uncompressed size */
	struct packed_git *in_pack;	/* already in pack */
	off_t in_pack_offset;
	struct object_entry *delta;	/* delta base object */
	struct object_entry *delta_child; /* deltified objects who bases me */
	struct object_entry *delta_sibling; /* other deltified objects who
					     * uses the same base as me
					     */
	void *delta_data;	/* cached delta (uncompressed) */
	unsigned long delta_size;	/* delta data size (uncompressed) */
	unsigned long z_delta_size;	/* delta data size (compressed) */
	unsigned type_:TYPE_BITS;
	unsigned in_pack_type:TYPE_BITS; /* could be delta */
	unsigned type_valid:1;
	uint32_t hash;			/* name hint hash */
	unsigned int in_pack_pos;
	unsigned char in_pack_header_size;
	unsigned preferred_base:1; /*
				    * we do not pack this, but is available
				    * to be used as the base object to delta
				    * objects against.
				    */
	unsigned no_try_delta:1;
	unsigned tagged:1; /* near the very tip of refs */
	unsigned filled:1; /* assigned write-order */
	unsigned dfs_state:OE_DFS_STATE_BITS;
	unsigned depth:OE_DEPTH_BITS;
};

struct packing_data {
	struct object_entry *objects;
	uint32_t nr_objects, nr_alloc;

	int32_t *index;
	uint32_t index_size;
};

struct object_entry *packlist_alloc(struct packing_data *pdata,
				    const unsigned char *sha1,
				    uint32_t index_pos);

struct object_entry *packlist_find(struct packing_data *pdata,
				   const unsigned char *sha1,
				   uint32_t *index_pos);

static inline uint32_t pack_name_hash(const char *name)
{
	uint32_t c, hash = 0;

	if (!name)
		return 0;

	/*
	 * This effectively just creates a sortable number from the
	 * last sixteen non-whitespace characters. Last characters
	 * count "most", so things that end in ".c" sort together.
	 */
	while ((c = *name++) != 0) {
		if (isspace(c))
			continue;
		hash = (hash >> 2) + (c << 24);
	}
	return hash;
}

static inline enum object_type oe_type(const struct object_entry *e)
{
	return e->type_valid ? e->type_ : OBJ_BAD;
}

static inline void oe_set_type(struct object_entry *e,
			       enum object_type type)
{
	if (type >= OBJ_ANY)
		die("BUG: OBJ_ANY cannot be set in pack-objects code");

	e->type_valid = type >= OBJ_NONE;
	e->type_ = (unsigned)type;
}

#endif
debug log:

solving 50908d1f2d ...
found 50908d1f2d in https://public-inbox.org/git/20180316183200.31014-5-pclouds@gmail.com/
found 2bb1732098 in https://public-inbox.org/git/20180316183200.31014-4-pclouds@gmail.com/
found 38d3ff167f in https://public-inbox.org/git/20180316183200.31014-3-pclouds@gmail.com/
found 85345a4af1 in https://public-inbox.org/git/20180316183200.31014-2-pclouds@gmail.com/
found 03f1191659 in https://80x24.org/mirrors/git.git
preparing index
index prepared:
100644 03f1191659dab55b2c4c440c347101a3cdbd4650	pack-objects.h

applying [1/4] https://public-inbox.org/git/20180316183200.31014-2-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 03f1191659..85345a4af1 100644


applying [2/4] https://public-inbox.org/git/20180316183200.31014-3-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 85345a4af1..38d3ff167f 100644


applying [3/4] https://public-inbox.org/git/20180316183200.31014-4-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 38d3ff167f..2bb1732098 100644


applying [4/4] https://public-inbox.org/git/20180316183200.31014-5-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 2bb1732098..50908d1f2d 100644

Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.

index at:
100644 50908d1f2ddca9c8b16d093baa3a36cefe351464	pack-objects.h

git@vger.kernel.org list mirror (unofficial, one of many)

Archives are clonable:
	git clone --mirror https://public-inbox.org/git
	git clone --mirror http://ou63pmih66umazou.onion/git
	git clone --mirror http://czquwvybam4bgbro.onion/git
	git clone --mirror http://hjrcffqmbrq6wope.onion/git

Example config snippet for mirrors

Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.version-control.git
	nntp://ou63pmih66umazou.onion/inbox.comp.version-control.git
	nntp://czquwvybam4bgbro.onion/inbox.comp.version-control.git
	nntp://hjrcffqmbrq6wope.onion/inbox.comp.version-control.git
	nntp://news.gmane.org/gmane.comp.version-control.git

 note: .onion URLs require Tor: https://www.torproject.org/

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git