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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
#include "cache.h"
#include "default.h"
#include "../commit.h"
#include "../fetch-negotiator.h"
#include "../prio-queue.h"
#include "../refs.h"
#include "../tag.h"
/* Remember to update object flag allocation in object.h */
#define COMMON (1U << 2)
#define COMMON_REF (1U << 3)
#define SEEN (1U << 4)
#define POPPED (1U << 5)
static int marked;
struct negotiation_state {
struct prio_queue rev_list;
int non_common_revs;
};
static void rev_list_push(struct negotiation_state *ns,
struct commit *commit, int mark)
{
if (!(commit->object.flags & mark)) {
commit->object.flags |= mark;
if (parse_commit(commit))
return;
prio_queue_put(&ns->rev_list, commit);
if (!(commit->object.flags & COMMON))
ns->non_common_revs++;
}
}
static int clear_marks(const char *refname, const struct object_id *oid,
int flag, void *cb_data)
{
struct object *o = deref_tag(the_repository, parse_object(the_repository, oid), refname, 0);
if (o && o->type == OBJ_COMMIT)
clear_commit_marks((struct commit *)o,
COMMON | COMMON_REF | SEEN | POPPED);
return 0;
}
/*
* This function marks a rev and its ancestors as common.
* In some cases, it is desirable to mark only the ancestors (for example
* when only the server does not yet know that they are common).
*/
static void mark_common(struct negotiation_state *ns, struct commit *commit,
int ancestors_only, int dont_parse)
{
if (commit != NULL && !(commit->object.flags & COMMON)) {
struct object *o = (struct object *)commit;
if (!ancestors_only)
o->flags |= COMMON;
if (!(o->flags & SEEN))
rev_list_push(ns, commit, SEEN);
else {
struct commit_list *parents;
if (!ancestors_only && !(o->flags & POPPED))
ns->non_common_revs--;
if (!o->parsed && !dont_parse)
if (parse_commit(commit))
return;
for (parents = commit->parents;
parents;
parents = parents->next)
mark_common(ns, parents->item, 0,
dont_parse);
}
}
}
/*
* Get the next rev to send, ignoring the common.
*/
static const struct object_id *get_rev(struct negotiation_state *ns)
{
struct commit *commit = NULL;
while (commit == NULL) {
unsigned int mark;
struct commit_list *parents;
if (ns->rev_list.nr == 0 || ns->non_common_revs == 0)
return NULL;
commit = prio_queue_get(&ns->rev_list);
parse_commit(commit);
parents = commit->parents;
commit->object.flags |= POPPED;
if (!(commit->object.flags & COMMON))
ns->non_common_revs--;
if (commit->object.flags & COMMON) {
/* do not send "have", and ignore ancestors */
commit = NULL;
mark = COMMON | SEEN;
} else if (commit->object.flags & COMMON_REF)
/* send "have", and ignore ancestors */
mark = COMMON | SEEN;
else
/* send "have", also for its ancestors */
mark = SEEN;
while (parents) {
if (!(parents->item->object.flags & SEEN))
rev_list_push(ns, parents->item, mark);
if (mark & COMMON)
mark_common(ns, parents->item, 1, 0);
parents = parents->next;
}
}
return &commit->object.oid;
}
static void known_common(struct fetch_negotiator *n, struct commit *c)
{
if (!(c->object.flags & SEEN)) {
rev_list_push(n->data, c, COMMON_REF | SEEN);
mark_common(n->data, c, 1, 1);
}
}
static void add_tip(struct fetch_negotiator *n, struct commit *c)
{
n->known_common = NULL;
rev_list_push(n->data, c, SEEN);
}
static const struct object_id *next(struct fetch_negotiator *n)
{
n->known_common = NULL;
n->add_tip = NULL;
return get_rev(n->data);
}
static int ack(struct fetch_negotiator *n, struct commit *c)
{
int known_to_be_common = !!(c->object.flags & COMMON);
mark_common(n->data, c, 0, 1);
return known_to_be_common;
}
static void release(struct fetch_negotiator *n)
{
clear_prio_queue(&((struct negotiation_state *)n->data)->rev_list);
FREE_AND_NULL(n->data);
}
void default_negotiator_init(struct fetch_negotiator *negotiator)
{
struct negotiation_state *ns;
negotiator->known_common = known_common;
negotiator->add_tip = add_tip;
negotiator->next = next;
negotiator->ack = ack;
negotiator->release = release;
negotiator->data = ns = xcalloc(1, sizeof(*ns));
ns->rev_list.compare = compare_commits_by_commit_date;
if (marked)
for_each_ref(clear_marks, NULL);
marked = 1;
}
|
