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#include "cache.h"
#include "promisor-remote.h"
#include "config.h"
#include "fetch-object.h"

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

struct promisor_remote *promisor_remote_new(const char *remote_name)
{
	struct promisor_remote *o;

	o = xcalloc(1, sizeof(*o));
	o->remote_name = xstrdup(remote_name);

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

	return o;
}

static struct promisor_remote *promisor_remote_look_up(const char *remote_name,
						       struct promisor_remote **previous)
{
	struct promisor_remote *o, *p;

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

	return NULL;
}

static void promisor_remote_move_to_tail(struct promisor_remote *o,
					 struct promisor_remote *previous)
{
	if (previous)
		previous->next = o->next;
	else
		promisors = o->next ? o->next : o;
	o->next = NULL;
	*promisors_tail = o;
	promisors_tail = &o->next;
}

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

	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_look_up(remote_name, NULL))
			promisor_remote_new(remote_name);

		free(remote_name);
		return 0;
	}

	return 0;
}

static void promisor_remote_do_init(int force)
{
	static int initialized;

	if (!force && initialized)
		return;
	initialized = 1;

	git_config(promisor_remote_config, NULL);

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

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

static inline void promisor_remote_init(void)
{
	promisor_remote_do_init(0);
}

void promisor_remote_reinit(void)
{
	promisor_remote_do_init(1);
}

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

	if (!remote_name)
		return promisors;

	return promisor_remote_look_up(remote_name, NULL);
}

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

int promisor_remote_get_direct(const struct object_id *oids, int oid_nr)
{
	struct promisor_remote *o;

	promisor_remote_init();

	for (o = promisors; o; o = o->next) {
		if (fetch_objects(o->remote_name, oids, oid_nr) < 0)
			continue;
		return 0;
	}

	return -1;
}

debug log:

solving dcf6ef6521 ...
found dcf6ef6521 in https://public-inbox.org/git/20190312132959.11764-6-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190122144212.15119-8-chriscool@tuxfamily.org/
found ea74f6d8a8 in https://public-inbox.org/git/20190312132959.11764-5-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190122144212.15119-7-chriscool@tuxfamily.org/
found f86f9d0b84 in https://public-inbox.org/git/20190312132959.11764-4-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190122144212.15119-6-chriscool@tuxfamily.org/
found d2f574651e in https://public-inbox.org/git/20190312132959.11764-3-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190122144212.15119-5-chriscool@tuxfamily.org/

applying [1/8] https://public-inbox.org/git/20190312132959.11764-3-chriscool@tuxfamily.org/
diff --git a/promisor-remote.c b/promisor-remote.c
new file mode 100644
index 0000000000..d2f574651e

Checking patch promisor-remote.c...
Applied patch promisor-remote.c cleanly.

skipping https://public-inbox.org/git/20190122144212.15119-5-chriscool@tuxfamily.org/ for d2f574651e
index at:
100644 d2f574651ef1bd61471701b0d3f71b926029f00f	promisor-remote.c

applying [2/8] https://public-inbox.org/git/20190312132959.11764-4-chriscool@tuxfamily.org/
diff --git a/promisor-remote.c b/promisor-remote.c
index d2f574651e..f86f9d0b84 100644

Checking patch promisor-remote.c...
5:32: new blank line at EOF.
+
Applied patch promisor-remote.c cleanly.
warning: 1 line adds whitespace errors.

skipping https://public-inbox.org/git/20190122144212.15119-6-chriscool@tuxfamily.org/ for f86f9d0b84
index at:
100644 f86f9d0b84abc91ad5d47a8a76adda5365f48b3b	promisor-remote.c

applying [3/8] https://public-inbox.org/git/20190312132959.11764-5-chriscool@tuxfamily.org/
diff --git a/promisor-remote.c b/promisor-remote.c
index f86f9d0b84..ea74f6d8a8 100644

Checking patch promisor-remote.c...
Applied patch promisor-remote.c cleanly.

skipping https://public-inbox.org/git/20190122144212.15119-7-chriscool@tuxfamily.org/ for ea74f6d8a8
index at:
100644 ea74f6d8a8336fdc31a64b14e8b8c1c2e15a3a32	promisor-remote.c

applying [4/8] https://public-inbox.org/git/20190312132959.11764-6-chriscool@tuxfamily.org/
diff --git a/promisor-remote.c b/promisor-remote.c
index ea74f6d8a8..dcf6ef6521 100644

Checking patch promisor-remote.c...
Applied patch promisor-remote.c cleanly.

skipping https://public-inbox.org/git/20190122144212.15119-8-chriscool@tuxfamily.org/ for dcf6ef6521
index at:
100644 dcf6ef65219c72ba71f58e79de7d60661fa034ae	promisor-remote.c

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