Add a repository argument to allow the callers of lookup_tree
to be more specific about which repository to act on. This is a small
mechanical change; it doesn't change the implementation to handle
repositories other than the_repository yet.

As with the previous commits, use a macro to catch callers passing a
repository other than the_repository at compile time.

Signed-off-by: Jonathan Nieder <jrnie...@gmail.com>
Signed-off-by: Stefan Beller <sbel...@google.com>
---
 builtin/am.c        | 6 ++++--
 builtin/diff-tree.c | 2 +-
 builtin/diff.c      | 3 ++-
 builtin/reflog.c    | 2 +-
 cache-tree.c        | 3 ++-
 commit-graph.c      | 2 +-
 commit.c            | 2 +-
 fsck.c              | 2 +-
 http-push.c         | 3 ++-
 list-objects.c      | 2 +-
 merge-recursive.c   | 6 +++---
 object.c            | 2 +-
 reachable.c         | 2 +-
 revision.c          | 4 ++--
 sequencer.c         | 2 +-
 tag.c               | 2 +-
 tree.c              | 4 ++--
 tree.h              | 3 ++-
 walker.c            | 3 ++-
 19 files changed, 31 insertions(+), 24 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index d834f9e62b6..f4b510bcc5f 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -32,6 +32,7 @@
 #include "apply.h"
 #include "string-list.h"
 #include "packfile.h"
+#include "repository.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -1400,9 +1401,10 @@ static void write_index_patch(const struct am_state 
*state)
        FILE *fp;
 
        if (!get_oid_tree("HEAD", &head))
-               tree = lookup_tree(&head);
+               tree = lookup_tree(the_repository, &head);
        else
-               tree = lookup_tree(the_hash_algo->empty_tree);
+               tree = lookup_tree(the_repository,
+                                  the_repository->hash_algo->empty_tree);
 
        fp = xfopen(am_path(state, "patch"), "w");
        init_revisions(&rev_info, NULL);
diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index d8db8f682f0..29901515a13 100644
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -46,7 +46,7 @@ static int stdin_diff_trees(struct tree *tree1, const char *p)
        struct tree *tree2;
        if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
                return error("Need exactly two trees, separated by a space");
-       tree2 = lookup_tree(&oid);
+       tree2 = lookup_tree(the_repository, &oid);
        if (!tree2 || parse_tree(tree2))
                return -1;
        printf("%s %s\n", oid_to_hex(&tree1->object.oid),
diff --git a/builtin/diff.c b/builtin/diff.c
index ed6092ef1a3..0b7d0d612dd 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -379,7 +379,8 @@ int cmd_diff(int argc, const char **argv, const char 
*prefix)
                                add_head_to_pending(&rev);
                                if (!rev.pending.nr) {
                                        struct tree *tree;
-                                       tree = 
lookup_tree(the_hash_algo->empty_tree);
+                                       tree = lookup_tree(the_repository,
+                                                          
the_repository->hash_algo->empty_tree);
                                        add_pending_object(&rev, &tree->object, 
"HEAD");
                                }
                                break;
diff --git a/builtin/reflog.c b/builtin/reflog.c
index 3a751fbaa60..93dabd7ce31 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -66,7 +66,7 @@ static int tree_is_complete(const struct object_id *oid)
        int complete;
        struct tree *tree;
 
-       tree = lookup_tree(oid);
+       tree = lookup_tree(the_repository, oid);
        if (!tree)
                return 0;
        if (tree->object.flags & SEEN)
diff --git a/cache-tree.c b/cache-tree.c
index 1c338c41f3a..69b214613dd 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -671,7 +671,8 @@ static void prime_cache_tree_rec(struct cache_tree *it, 
struct tree *tree)
                        cnt++;
                else {
                        struct cache_tree_sub *sub;
-                       struct tree *subtree = lookup_tree(entry.oid);
+                       struct tree *subtree = lookup_tree(the_repository,
+                                                          entry.oid);
                        if (!subtree->object.parsed)
                                parse_tree(subtree);
                        sub = cache_tree_sub(it, entry.path);
diff --git a/commit-graph.c b/commit-graph.c
index 71125d7cbb6..88a4b0d2a47 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -261,7 +261,7 @@ static int fill_commit_in_graph(struct commit *item, struct 
commit_graph *g, uin
        item->graph_pos = pos;
 
        hashcpy(oid.hash, commit_data);
-       item->tree = lookup_tree(&oid);
+       item->tree = lookup_tree(the_repository, &oid);
 
        date_high = get_be32(commit_data + g->hash_len + 8) & 0x3;
        date_low = get_be32(commit_data + g->hash_len + 12);
diff --git a/commit.c b/commit.c
index d76d64d4dfc..755b8b9d94f 100644
--- a/commit.c
+++ b/commit.c
@@ -354,7 +354,7 @@ int parse_commit_buffer(struct commit *item, const void 
*buffer, unsigned long s
        if (get_sha1_hex(bufptr + 5, parent.hash) < 0)
                return error("bad tree pointer in commit %s",
                             oid_to_hex(&item->object.oid));
-       item->tree = lookup_tree(&parent);
+       item->tree = lookup_tree(the_repository, &parent);
        bufptr += tree_entry_len + 1; /* "tree " + "hex sha1" + "\n" */
        pptr = &item->parents;
 
diff --git a/fsck.c b/fsck.c
index 2d372f2a3f3..b07abb9796c 100644
--- a/fsck.c
+++ b/fsck.c
@@ -360,7 +360,7 @@ static int fsck_walk_tree(struct tree *tree, void *data, 
struct fsck_options *op
                        continue;
 
                if (S_ISDIR(entry.mode)) {
-                       obj = (struct object *)lookup_tree(entry.oid);
+                       obj = (struct object *)lookup_tree(the_repository, 
entry.oid);
                        if (name && obj)
                                put_object_name(options, obj, "%s%s/", name,
                                        entry.path);
diff --git a/http-push.c b/http-push.c
index 8c9d285c914..94ae9671def 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1311,7 +1311,8 @@ static struct object_list **process_tree(struct tree 
*tree,
        while (tree_entry(&desc, &entry))
                switch (object_type(entry.mode)) {
                case OBJ_TREE:
-                       p = process_tree(lookup_tree(entry.oid), p);
+                       p = process_tree(lookup_tree(the_repository, entry.oid),
+                                        p);
                        break;
                case OBJ_BLOB:
                        p = process_blob(lookup_blob(the_repository, entry.oid),
diff --git a/list-objects.c b/list-objects.c
index 56682c2a441..b9159c24671 100644
--- a/list-objects.c
+++ b/list-objects.c
@@ -158,7 +158,7 @@ static void process_tree(struct rev_info *revs,
 
                if (S_ISDIR(entry.mode))
                        process_tree(revs,
-                                    lookup_tree(entry.oid),
+                                    lookup_tree(the_repository, entry.oid),
                                     show, base, entry.path,
                                     cb_data, filter_fn, filter_data);
                else if (S_ISGITLINK(entry.mode))
diff --git a/merge-recursive.c b/merge-recursive.c
index 8ddedf79c0b..1b06f25b38c 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -96,7 +96,7 @@ static struct tree *shift_tree_object(struct tree *one, 
struct tree *two,
        }
        if (!oidcmp(&two->object.oid, &shifted))
                return two;
-       return lookup_tree(&shifted);
+       return lookup_tree(the_repository, &shifted);
 }
 
 static struct commit *make_virtual_commit(struct tree *tree, const char 
*comment)
@@ -335,7 +335,7 @@ struct tree *write_tree_from_memory(struct merge_options *o)
                return NULL;
        }
 
-       result = lookup_tree(&active_cache_tree->oid);
+       result = lookup_tree(the_repository, &active_cache_tree->oid);
 
        return result;
 }
@@ -2123,7 +2123,7 @@ int merge_recursive(struct merge_options *o,
                /* if there is no common ancestor, use an empty tree */
                struct tree *tree;
 
-               tree = lookup_tree(the_hash_algo->empty_tree);
+               tree = lookup_tree(the_repository, 
the_repository->hash_algo->empty_tree);
                merged_common_ancestors = make_virtual_commit(tree, "ancestor");
        }
 
diff --git a/object.c b/object.c
index 8d790ac920a..1a67d6e341f 100644
--- a/object.c
+++ b/object.c
@@ -200,7 +200,7 @@ struct object *parse_object_buffer_the_repository(const 
struct object_id *oid, e
                        obj = &blob->object;
                }
        } else if (type == OBJ_TREE) {
-               struct tree *tree = lookup_tree(oid);
+               struct tree *tree = lookup_tree(the_repository, oid);
                if (tree) {
                        obj = &tree->object;
                        if (!tree->buffer)
diff --git a/reachable.c b/reachable.c
index cc25f012e5d..6e9b810d2a5 100644
--- a/reachable.c
+++ b/reachable.c
@@ -88,7 +88,7 @@ static void add_recent_object(const struct object_id *oid,
                obj = parse_object_or_die(oid, NULL);
                break;
        case OBJ_TREE:
-               obj = (struct object *)lookup_tree(oid);
+               obj = (struct object *)lookup_tree(the_repository, oid);
                break;
        case OBJ_BLOB:
                obj = (struct object *)lookup_blob(the_repository, oid);
diff --git a/revision.c b/revision.c
index aeccbf5fe24..79f228b1586 100644
--- a/revision.c
+++ b/revision.c
@@ -66,7 +66,7 @@ static void mark_tree_contents_uninteresting(struct tree 
*tree)
        while (tree_entry(&desc, &entry)) {
                switch (object_type(entry.mode)) {
                case OBJ_TREE:
-                       mark_tree_uninteresting(lookup_tree(entry.oid));
+                       mark_tree_uninteresting(lookup_tree(the_repository, 
entry.oid));
                        break;
                case OBJ_BLOB:
                        mark_blob_uninteresting(lookup_blob(the_repository, 
entry.oid));
@@ -1312,7 +1312,7 @@ static void add_cache_tree(struct cache_tree *it, struct 
rev_info *revs,
        int i;
 
        if (it->entry_count >= 0) {
-               struct tree *tree = lookup_tree(&it->oid);
+               struct tree *tree = lookup_tree(the_repository, &it->oid);
                add_pending_object_with_path(revs, &tree->object, "",
                                             040000, path->buf);
        }
diff --git a/sequencer.c b/sequencer.c
index d715c877501..bf5620dff0c 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -397,7 +397,7 @@ static int read_oneliner(struct strbuf *buf,
 
 static struct tree *empty_tree(void)
 {
-       return lookup_tree(the_hash_algo->empty_tree);
+       return lookup_tree(the_repository, 
the_repository->hash_algo->empty_tree);
 }
 
 static int error_dirty_index(struct replay_opts *opts)
diff --git a/tag.c b/tag.c
index a31ae75e960..310102150ab 100644
--- a/tag.c
+++ b/tag.c
@@ -156,7 +156,7 @@ int parse_tag_buffer(struct tag *item, const void *data, 
unsigned long size)
        if (!strcmp(type, blob_type)) {
                item->tagged = (struct object *)lookup_blob(the_repository, 
&oid);
        } else if (!strcmp(type, tree_type)) {
-               item->tagged = (struct object *)lookup_tree(&oid);
+               item->tagged = (struct object *)lookup_tree(the_repository, 
&oid);
        } else if (!strcmp(type, commit_type)) {
                item->tagged = (struct object *)lookup_commit(&oid);
        } else if (!strcmp(type, tag_type)) {
diff --git a/tree.c b/tree.c
index bd74ed66e23..fbc8d4bc653 100644
--- a/tree.c
+++ b/tree.c
@@ -120,7 +120,7 @@ static int read_tree_1(struct tree *tree, struct strbuf 
*base,
                len = tree_entry_len(&entry);
                strbuf_add(base, entry.path, len);
                strbuf_addch(base, '/');
-               retval = read_tree_1(lookup_tree(&oid),
+               retval = read_tree_1(lookup_tree(the_repository, &oid),
                                     base, stage, pathspec,
                                     fn, context);
                strbuf_setlen(base, oldlen);
@@ -195,7 +195,7 @@ int read_tree(struct tree *tree, int stage, struct pathspec 
*match,
        return 0;
 }
 
-struct tree *lookup_tree(const struct object_id *oid)
+struct tree *lookup_tree_the_repository(const struct object_id *oid)
 {
        struct object *obj = lookup_object(the_repository, oid->hash);
        if (!obj)
diff --git a/tree.h b/tree.h
index e2a80be4ef8..2ea21ed174b 100644
--- a/tree.h
+++ b/tree.h
@@ -12,7 +12,8 @@ struct tree {
        unsigned long size;
 };
 
-struct tree *lookup_tree(const struct object_id *oid);
+#define lookup_tree(r, oid) lookup_tree_##r(oid)
+struct tree *lookup_tree_the_repository(const struct object_id *oid);
 
 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size);
 
diff --git a/walker.c b/walker.c
index ea0c41f47a2..07cecfda693 100644
--- a/walker.c
+++ b/walker.c
@@ -49,7 +49,8 @@ static int process_tree(struct walker *walker, struct tree 
*tree)
                if (S_ISGITLINK(entry.mode))
                        continue;
                if (S_ISDIR(entry.mode)) {
-                       struct tree *tree = lookup_tree(entry.oid);
+                       struct tree *tree = lookup_tree(the_repository,
+                                                       entry.oid);
                        if (tree)
                                obj = &tree->object;
                }
-- 
2.18.0.rc1.244.gcf134e6275-goog

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