Instead of using the repository_format_partial_clone global
and fetch_objects() directly, let's use has_promisor_remote()
and promisors_get_direct().

This way all the configured promisor remotes will be taken
into account, not only the one specified by
extensions.partialClone.

Also when cloning or fetching using a partial clone filter,
remote.origin.promisor will be set to "true" instead of
setting extensions.partialClone to "origin". This makes it
possible to use many promisor remote just by fetching from
them.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 builtin/cat-file.c            |  5 +++--
 builtin/fetch.c               | 11 ++++++-----
 builtin/gc.c                  |  3 ++-
 builtin/repack.c              |  3 ++-
 cache-tree.c                  |  3 ++-
 connected.c                   |  3 ++-
 list-objects-filter-options.c | 28 +++++++++++++++-------------
 packfile.c                    |  3 ++-
 sha1-file.c                   | 14 ++++++++------
 t/t5601-clone.sh              |  2 +-
 t/t5616-partial-clone.sh      |  2 +-
 unpack-trees.c                |  6 +++---
 12 files changed, 47 insertions(+), 36 deletions(-)

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 2ca56fd086..bdb0331ba4 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -14,6 +14,7 @@
 #include "sha1-array.h"
 #include "packfile.h"
 #include "object-store.h"
+#include "promisor-remote.h"
 
 struct batch_options {
        int enabled;
@@ -517,8 +518,8 @@ static int batch_objects(struct batch_options *opt)
        if (opt->all_objects) {
                struct object_cb_data cb;
 
-               if (repository_format_partial_clone)
-                       warning("This repository has extensions.partialClone 
set. Some objects may not be loaded.");
+               if (has_promisor_remote())
+                       warning("This repository uses promisor remotes. Some 
objects may not be loaded.");
 
                cb.opt = opt;
                cb.expand = &data;
diff --git a/builtin/fetch.c b/builtin/fetch.c
index e0140327aa..647a60b26c 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -23,6 +23,7 @@
 #include "packfile.h"
 #include "list-objects-filter-options.h"
 #include "commit-reach.h"
+#include "promisor-remote.h"
 
 static const char * const builtin_fetch_usage[] = {
        N_("git fetch [<options>] [<repository> [<refspec>...]]"),
@@ -1459,7 +1460,7 @@ static inline void fetch_one_setup_partial(struct remote 
*remote)
         * If no prior partial clone/fetch and the current fetch DID NOT
         * request a partial-fetch, do a normal fetch.
         */
-       if (!repository_format_partial_clone && !filter_options.choice)
+       if (!has_promisor_remote() && !filter_options.choice)
                return;
 
        /*
@@ -1467,7 +1468,7 @@ static inline void fetch_one_setup_partial(struct remote 
*remote)
         * on this repo and remember the given filter-spec as the default
         * for subsequent fetches to this remote.
         */
-       if (!repository_format_partial_clone && filter_options.choice) {
+       if (!has_promisor_remote() && filter_options.choice) {
                partial_clone_register(remote->name, &filter_options);
                return;
        }
@@ -1476,7 +1477,7 @@ static inline void fetch_one_setup_partial(struct remote 
*remote)
         * We are currently limited to only ONE promisor remote and only
         * allow partial-fetches from the promisor remote.
         */
-       if (strcmp(remote->name, repository_format_partial_clone)) {
+       if (!find_promisor_remote(remote->name)) {
                if (filter_options.choice)
                        die(_("--filter can only be used with the remote 
configured in core.partialClone"));
                return;
@@ -1607,7 +1608,7 @@ int cmd_fetch(int argc, const char **argv, const char 
*prefix)
        if (depth || deepen_since || deepen_not.nr)
                deepen = 1;
 
-       if (filter_options.choice && !repository_format_partial_clone)
+       if (filter_options.choice && !has_promisor_remote())
                die("--filter can only be used when extensions.partialClone is 
set");
 
        if (all) {
@@ -1641,7 +1642,7 @@ int cmd_fetch(int argc, const char **argv, const char 
*prefix)
        }
 
        if (remote) {
-               if (filter_options.choice || repository_format_partial_clone)
+               if (filter_options.choice || has_promisor_remote())
                        fetch_one_setup_partial(remote);
                result = fetch_one(remote, argc, argv, prune_tags_ok);
        } else {
diff --git a/builtin/gc.c b/builtin/gc.c
index 871a56f1c5..42dfa3a23c 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -27,6 +27,7 @@
 #include "pack-objects.h"
 #include "blob.h"
 #include "tree.h"
+#include "promisor-remote.h"
 
 #define FAILED_RUN "failed to run %s"
 
@@ -640,7 +641,7 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
                        argv_array_push(&prune, prune_expire);
                        if (quiet)
                                argv_array_push(&prune, "--no-progress");
-                       if (repository_format_partial_clone)
+                       if (has_promisor_remote())
                                argv_array_push(&prune,
                                                "--exclude-promisor-objects");
                        if (run_command_v_opt(prune.argv, RUN_GIT_CMD))
diff --git a/builtin/repack.c b/builtin/repack.c
index 45583683ee..26e02e3135 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -11,6 +11,7 @@
 #include "midx.h"
 #include "packfile.h"
 #include "object-store.h"
+#include "promisor-remote.h"
 
 static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
@@ -366,7 +367,7 @@ int cmd_repack(int argc, const char **argv, const char 
*prefix)
        argv_array_push(&cmd.args, "--all");
        argv_array_push(&cmd.args, "--reflog");
        argv_array_push(&cmd.args, "--indexed-objects");
-       if (repository_format_partial_clone)
+       if (has_promisor_remote())
                argv_array_push(&cmd.args, "--exclude-promisor-objects");
        if (write_bitmaps)
                argv_array_push(&cmd.args, "--write-bitmap-index");
diff --git a/cache-tree.c b/cache-tree.c
index 9d454d24bc..a1ecb2a1fa 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -5,6 +5,7 @@
 #include "cache-tree.h"
 #include "object-store.h"
 #include "replace-object.h"
+#include "promisor-remote.h"
 
 #ifndef DEBUG
 #define DEBUG 0
@@ -357,7 +358,7 @@ static int update_one(struct cache_tree *it,
                }
 
                ce_missing_ok = mode == S_IFGITLINK || missing_ok ||
-                       (repository_format_partial_clone &&
+                       (has_promisor_remote() &&
                         ce_skip_worktree(ce));
                if (is_null_oid(oid) ||
                    (!ce_missing_ok && !has_object_file(oid))) {
diff --git a/connected.c b/connected.c
index 1bba888eff..0eaaedee6a 100644
--- a/connected.c
+++ b/connected.c
@@ -4,6 +4,7 @@
 #include "connected.h"
 #include "transport.h"
 #include "packfile.h"
+#include "promisor-remote.h"
 
 /*
  * If we feed all the commits we want to verify to this command
@@ -56,7 +57,7 @@ int check_connected(oid_iterate_fn fn, void *cb_data,
        argv_array_push(&rev_list.args,"rev-list");
        argv_array_push(&rev_list.args, "--objects");
        argv_array_push(&rev_list.args, "--stdin");
-       if (repository_format_partial_clone)
+       if (has_promisor_remote())
                argv_array_push(&rev_list.args, "--exclude-promisor-objects");
        if (!opt->is_deepening_fetch) {
                argv_array_push(&rev_list.args, "--not");
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index e8da2e8581..3b5ff55480 100644
--- a/list-objects-filter-options.c
+++ b/list-objects-filter-options.c
@@ -6,6 +6,7 @@
 #include "list-objects.h"
 #include "list-objects-filter.h"
 #include "list-objects-filter-options.h"
+#include "promisor-remote.h"
 
 /*
  * Parse value of the argument to the "filter" keyword.
@@ -125,30 +126,31 @@ void partial_clone_register(
        const char *remote,
        const struct list_objects_filter_options *filter_options)
 {
-       /*
-        * Record the name of the partial clone remote in the
-        * config and in the global variable -- the latter is
-        * used throughout to indicate that partial clone is
-        * enabled and to expect missing objects.
-        */
-       if (repository_format_partial_clone &&
-           *repository_format_partial_clone &&
-           strcmp(remote, repository_format_partial_clone))
-               die(_("cannot change partial clone promisor remote"));
+       char *cfg_name;
 
-       git_config_set("core.repositoryformatversion", "1");
-       git_config_set("extensions.partialclone", remote);
+       /* Check if it is already registered */
+       if (!find_promisor_remote(remote)) {
+               git_config_set("core.repositoryformatversion", "1");
 
-       repository_format_partial_clone = xstrdup(remote);
+               /* Add promisor config for the remote */
+               cfg_name = xstrfmt("remote.%s.promisor", remote);
+               git_config_set(cfg_name, "true");
+               free(cfg_name);
+       }
 
        /*
         * Record the initial filter-spec in the config as
         * the default for subsequent fetches from this remote.
+        *
+        * TODO: record it into remote.<name>.partialclonefilter
         */
        core_partial_clone_filter_default =
                xstrdup(filter_options->filter_spec);
        git_config_set("core.partialclonefilter",
                       core_partial_clone_filter_default);
+
+       /* Make sure the config info are reset */
+       promisor_remote_reinit();
 }
 
 void partial_clone_get_default_filter_spec(
diff --git a/packfile.c b/packfile.c
index d1e6683ffe..7aaeea7693 100644
--- a/packfile.c
+++ b/packfile.c
@@ -16,6 +16,7 @@
 #include "tree.h"
 #include "object-store.h"
 #include "midx.h"
+#include "promisor-remote.h"
 
 char *odb_pack_name(struct strbuf *buf,
                    const unsigned char *sha1,
@@ -2113,7 +2114,7 @@ int is_promisor_object(const struct object_id *oid)
        static int promisor_objects_prepared;
 
        if (!promisor_objects_prepared) {
-               if (repository_format_partial_clone) {
+               if (has_promisor_remote()) {
                        for_each_packed_object(add_promisor_object,
                                               &promisor_objects,
                                               FOR_EACH_OBJECT_PROMISOR_ONLY);
diff --git a/sha1-file.c b/sha1-file.c
index cf88eeb147..f1acaa3254 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -32,6 +32,7 @@
 #include "packfile.h"
 #include "fetch-object.h"
 #include "object-store.h"
+#include "promisor-remote.h"
 
 /* The maximum size for an object header. */
 #define MAX_HEADER_LEN 32
@@ -1309,15 +1310,16 @@ int oid_object_info_extended(struct repository *r, 
const struct object_id *oid,
                }
 
                /* Check if it is a missing object */
-               if (fetch_if_missing && repository_format_partial_clone &&
+               if (fetch_if_missing && has_promisor_remote() &&
                    !already_retried && r == the_repository) {
                        /*
-                        * TODO Investigate checking fetch_object() return
-                        * TODO value and stopping on error here.
-                        * TODO Pass a repository struct through fetch_object,
-                        * such that arbitrary repositories work.
+                        * TODO Investigate checking promisors_get_direct()
+                        * TODO return value and stopping on error here.
+                        * TODO Pass a repository struct through
+                        * promisors_get_direct(), such that arbitrary
+                        * repositories work.
                         */
-                       fetch_objects(repository_format_partial_clone, real, 1);
+                       promisors_get_direct(real, 1);
                        already_retried = 1;
                        continue;
                }
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 8bbc7068ac..aafe55b8b7 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -653,7 +653,7 @@ partial_clone () {
        git -C client fsck &&
 
        # Ensure that unneeded blobs are not inadvertently fetched.
-       test_config -C client extensions.partialclone "not a remote" &&
+       test_config -C client remote.origin.promisor "false" &&
        test_must_fail git -C client cat-file -e "$HASH1" &&
 
        # But this blob was fetched, because clone performs an initial checkout
diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 336f02a41a..d09dee1f14 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -42,7 +42,7 @@ test_expect_success 'do partial clone 1' '
 
        test_cmp expect_1.oids observed.oids &&
        test "$(git -C pc1 config --local core.repositoryformatversion)" = "1" 
&&
-       test "$(git -C pc1 config --local extensions.partialclone)" = "origin" 
&&
+       test "$(git -C pc1 config --local remote.origin.promisor)" = "true" &&
        test "$(git -C pc1 config --local core.partialclonefilter)" = 
"blob:none"
 '
 
diff --git a/unpack-trees.c b/unpack-trees.c
index 7570df481b..9ad157eeab 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -18,6 +18,7 @@
 #include "fsmonitor.h"
 #include "object-store.h"
 #include "fetch-object.h"
+#include "promisor-remote.h"
 
 /*
  * Error messages expected by scripts out of plumbing commands such as
@@ -418,7 +419,7 @@ static int check_updates(struct unpack_trees_options *o)
                load_gitmodules_file(index, &state);
 
        enable_delayed_checkout(&state);
-       if (repository_format_partial_clone && o->update && !o->dry_run) {
+       if (has_promisor_remote() && o->update && !o->dry_run) {
                /*
                 * Prefetch the objects that are to be checked out in the loop
                 * below.
@@ -435,8 +436,7 @@ static int check_updates(struct unpack_trees_options *o)
                        }
                }
                if (to_fetch.nr)
-                       fetch_objects(repository_format_partial_clone,
-                                     to_fetch.oid, to_fetch.nr);
+                       promisors_get_direct(to_fetch.oid, to_fetch.nr);
                fetch_if_missing = fetch_if_missing_store;
                oid_array_clear(&to_fetch);
        }
-- 
2.20.0.rc2.14.g1379de12fa.dirty

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