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-rw-r--r--promisor-remote.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/promisor-remote.c b/promisor-remote.c
new file mode 100644
index 0000000000..9bc296cdde
--- /dev/null
+++ b/promisor-remote.c
@@ -0,0 +1,265 @@
+#include "cache.h"
+#include "object-store.h"
+#include "promisor-remote.h"
+#include "config.h"
+#include "transport.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_refs(const char *remote_name, struct ref *ref)
+{
+ struct remote *remote;
+ struct transport *transport;
+ int original_fetch_if_missing = fetch_if_missing;
+ int res;
+
+ fetch_if_missing = 0;
+ remote = remote_get(remote_name);
+ if (!remote->url[0])
+ die(_("Remote with no URL"));
+ transport = transport_get(remote, remote->url[0]);
+
+ transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
+ transport_set_option(transport, TRANS_OPT_NO_DEPENDENTS, "1");
+ res = transport_fetch_refs(transport, ref);
+ fetch_if_missing = original_fetch_if_missing;
+
+ return res;
+}
+
+static int fetch_objects(const char *remote_name,
+ const struct object_id *oids,
+ int oid_nr)
+{
+ struct ref *ref = NULL;
+ int i;
+
+ for (i = 0; i < oid_nr; i++) {
+ struct ref *new_ref = alloc_ref(oid_to_hex(&oids[i]));
+ oidcpy(&new_ref->old_oid, &oids[i]);
+ new_ref->exact_oid = 1;
+ new_ref->next = ref;
+ ref = new_ref;
+ }
+ return fetch_refs(remote_name, ref);
+}
+
+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 (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;
+ int 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;
+
+ 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;
+}