summaryrefslogtreecommitdiff
path: root/promisor-remote.c
blob: 6530e26f98cc4df511527a10fda2d605ac5b1e20 (plain)
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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
#include "cache.h"
#include "object-store.h"
#include "promisor-remote.h"
#include "config.h"
#include "transport.h"
#include "strvec.h"

static char *repository_format_partial_clone;
static const char *core_partial_clone_filter_default;

void set_repository_format_partial_clone(char *partial_clone)
{
	repository_format_partial_clone = xstrdup_or_null(partial_clone);
}

static int fetch_objects(const char *remote_name,
			 const struct object_id *oids,
			 int oid_nr)
{
	struct child_process child = CHILD_PROCESS_INIT;
	int i;
	FILE *child_in;

	child.git_cmd = 1;
	child.in = -1;
	strvec_pushl(&child.args, "-c", "fetch.negotiationAlgorithm=noop",
		     "fetch", remote_name, "--no-tags",
		     "--no-write-fetch-head", "--recurse-submodules=no",
		     "--filter=blob:none", "--stdin", NULL);
	if (start_command(&child))
		die(_("promisor-remote: unable to fork off fetch subprocess"));
	child_in = xfdopen(child.in, "w");

	for (i = 0; i < oid_nr; i++) {
		if (fputs(oid_to_hex(&oids[i]), child_in) < 0)
			die_errno(_("promisor-remote: could not write to fetch subprocess"));
		if (fputc('\n', child_in) < 0)
			die_errno(_("promisor-remote: could not write to fetch subprocess"));
	}

	if (fclose(child_in) < 0)
		die_errno(_("promisor-remote: could not close stdin to fetch subprocess"));
	return finish_command(&child) ? -1 : 0;
}

static struct promisor_remote *promisors;
static struct promisor_remote **promisors_tail = &promisors;

static struct promisor_remote *promisor_remote_new(const char *remote_name)
{
	struct promisor_remote *r;

	if (*remote_name == '/') {
		warning(_("promisor remote name cannot begin with '/': %s"),
			remote_name);
		return NULL;
	}

	FLEX_ALLOC_STR(r, name, remote_name);

	*promisors_tail = r;
	promisors_tail = &r->next;

	return r;
}

static struct promisor_remote *promisor_remote_lookup(const char *remote_name,
						      struct promisor_remote **previous)
{
	struct promisor_remote *r, *p;

	for (p = NULL, r = promisors; r; p = r, r = r->next)
		if (!strcmp(r->name, remote_name)) {
			if (previous)
				*previous = p;
			return r;
		}

	return NULL;
}

static void promisor_remote_move_to_tail(struct promisor_remote *r,
					 struct promisor_remote *previous)
{
	if (r->next == NULL)
		return;

	if (previous)
		previous->next = r->next;
	else
		promisors = r->next ? r->next : r;
	r->next = NULL;
	*promisors_tail = r;
	promisors_tail = &r->next;
}

static int promisor_remote_config(const char *var, const char *value, void *data)
{
	const char *name;
	size_t namelen;
	const char *subkey;

	if (!strcmp(var, "core.partialclonefilter"))
		return git_config_string(&core_partial_clone_filter_default,
					 var, value);

	if (parse_config_key(var, "remote", &name, &namelen, &subkey) < 0)
		return 0;

	if (!strcmp(subkey, "promisor")) {
		char *remote_name;

		if (!git_config_bool(var, value))
			return 0;

		remote_name = xmemdupz(name, namelen);

		if (!promisor_remote_lookup(remote_name, NULL))
			promisor_remote_new(remote_name);

		free(remote_name);
		return 0;
	}
	if (!strcmp(subkey, "partialclonefilter")) {
		struct promisor_remote *r;
		char *remote_name = xmemdupz(name, namelen);

		r = promisor_remote_lookup(remote_name, NULL);
		if (!r)
			r = promisor_remote_new(remote_name);

		free(remote_name);

		if (!r)
			return 0;

		return git_config_string(&r->partial_clone_filter, var, value);
	}

	return 0;
}

static int initialized;

static void promisor_remote_init(void)
{
	if (initialized)
		return;
	initialized = 1;

	git_config(promisor_remote_config, NULL);

	if (repository_format_partial_clone) {
		struct promisor_remote *o, *previous;

		o = promisor_remote_lookup(repository_format_partial_clone,
					   &previous);
		if (o)
			promisor_remote_move_to_tail(o, previous);
		else
			promisor_remote_new(repository_format_partial_clone);
	}
}

static void promisor_remote_clear(void)
{
	while (promisors) {
		struct promisor_remote *r = promisors;
		promisors = promisors->next;
		free(r);
	}

	promisors_tail = &promisors;
}

void promisor_remote_reinit(void)
{
	initialized = 0;
	promisor_remote_clear();
	promisor_remote_init();
}

struct promisor_remote *promisor_remote_find(const char *remote_name)
{
	promisor_remote_init();

	if (!remote_name)
		return promisors;

	return promisor_remote_lookup(remote_name, NULL);
}

int has_promisor_remote(void)
{
	return !!promisor_remote_find(NULL);
}

static int remove_fetched_oids(struct repository *repo,
			       struct object_id **oids,
			       int oid_nr, int to_free)
{
	int i, remaining_nr = 0;
	int *remaining = xcalloc(oid_nr, sizeof(*remaining));
	struct object_id *old_oids = *oids;
	struct object_id *new_oids;

	for (i = 0; i < oid_nr; i++)
		if (oid_object_info_extended(repo, &old_oids[i], NULL,
					     OBJECT_INFO_SKIP_FETCH_OBJECT)) {
			remaining[i] = 1;
			remaining_nr++;
		}

	if (remaining_nr) {
		int j = 0;
		new_oids = xcalloc(remaining_nr, sizeof(*new_oids));
		for (i = 0; i < oid_nr; i++)
			if (remaining[i])
				oidcpy(&new_oids[j++], &old_oids[i]);
		*oids = new_oids;
		if (to_free)
			free(old_oids);
	}

	free(remaining);

	return remaining_nr;
}

int promisor_remote_get_direct(struct repository *repo,
			       const struct object_id *oids,
			       int oid_nr)
{
	struct promisor_remote *r;
	struct object_id *remaining_oids = (struct object_id *)oids;
	int remaining_nr = oid_nr;
	int to_free = 0;
	int res = -1;

	if (oid_nr == 0)
		return 0;

	promisor_remote_init();

	for (r = promisors; r; r = r->next) {
		if (fetch_objects(r->name, remaining_oids, remaining_nr) < 0) {
			if (remaining_nr == 1)
				continue;
			remaining_nr = remove_fetched_oids(repo, &remaining_oids,
							 remaining_nr, to_free);
			if (remaining_nr) {
				to_free = 1;
				continue;
			}
		}
		res = 0;
		break;
	}

	if (to_free)
		free(remaining_oids);

	return res;
}