[PATCH 08/19] loose: write loose objects map via their source

[Patrick Steinhardt <ps@pks.im>]

When a repository is configured to have a compatibility hash algorithm
we keep track of object ID mappings for loose objects via the loose
object map. This map simply maps an object ID of the actual hash to the
object ID of the compatibility hash. This loose object map is an
inherent property of the loose files backend and thus of one specific
object source.

Refactor the interfaces to reflect this by requiring a `struct
odb_source` as input instead of a repository. This prepares for
subsequent commits where we will refactor writing of loose objects to
work on a `struct odb_source`, as well.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 loose.c       | 16 +++++++++-------
 loose.h       |  4 +++-
 object-file.c |  6 +++---
 3 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/loose.c b/loose.c
index 519f5db7935..e8ea6e7e24b 100644
--- a/loose.c
+++ b/loose.c
@@ -166,7 +166,8 @@ int repo_write_loose_object_map(struct repository *repo)
 	return -1;
 }
 
-static int write_one_object(struct repository *repo, const struct object_id *oid,
+static int write_one_object(struct odb_source *source,
+			    const struct object_id *oid,
 			    const struct object_id *compat_oid)
 {
 	struct lock_file lock;
@@ -174,7 +175,7 @@ static int write_one_object(struct repository *repo, const struct object_id *oid
 	struct stat st;
 	struct strbuf buf = STRBUF_INIT, path = STRBUF_INIT;
 
-	repo_common_path_replace(repo, &path, "objects/loose-object-idx");
+	strbuf_addf(&path, "%s/loose-object-idx", source->path);
 	hold_lock_file_for_update_timeout(&lock, path.buf, LOCK_DIE_ON_ERROR, -1);
 
 	fd = open(path.buf, O_WRONLY | O_CREAT | O_APPEND, 0666);
@@ -190,7 +191,7 @@ static int write_one_object(struct repository *repo, const struct object_id *oid
 		goto errout;
 	if (close(fd))
 		goto errout;
-	adjust_shared_perm(repo, path.buf);
+	adjust_shared_perm(source->odb->repo, path.buf);
 	rollback_lock_file(&lock);
 	strbuf_release(&buf);
 	strbuf_release(&path);
@@ -204,17 +205,18 @@ static int write_one_object(struct repository *repo, const struct object_id *oid
 	return -1;
 }
 
-int repo_add_loose_object_map(struct repository *repo, const struct object_id *oid,
+int repo_add_loose_object_map(struct odb_source *source,
+			      const struct object_id *oid,
 			      const struct object_id *compat_oid)
 {
 	int inserted = 0;
 
-	if (!should_use_loose_object_map(repo))
+	if (!should_use_loose_object_map(source->odb->repo))
 		return 0;
 
-	inserted = insert_loose_map(repo->objects->sources, oid, compat_oid);
+	inserted = insert_loose_map(source, oid, compat_oid);
 	if (inserted)
-		return write_one_object(repo, oid, compat_oid);
+		return write_one_object(source, oid, compat_oid);
 	return 0;
 }
 
diff --git a/loose.h b/loose.h
index 28512306e5f..6af1702973c 100644
--- a/loose.h
+++ b/loose.h
@@ -4,6 +4,7 @@
 #include "khash.h"
 
 struct repository;
+struct odb_source;
 
 struct loose_object_map {
 	kh_oid_map_t *to_compat;
@@ -16,7 +17,8 @@ int repo_loose_object_map_oid(struct repository *repo,
 			      const struct object_id *src,
 			      const struct git_hash_algo *dest_algo,
 			      struct object_id *dest);
-int repo_add_loose_object_map(struct repository *repo, const struct object_id *oid,
+int repo_add_loose_object_map(struct odb_source *source,
+			      const struct object_id *oid,
 			      const struct object_id *compat_oid);
 int repo_read_loose_object_map(struct repository *repo);
 int repo_write_loose_object_map(struct repository *repo);
diff --git a/object-file.c b/object-file.c
index 6a7049a9e98..a9248760a26 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1025,7 +1025,7 @@ int stream_loose_object(struct input_stream *in_stream, size_t len,
 	err = finalize_object_file_flags(the_repository, tmp_file.buf, filename.buf,
 					 FOF_SKIP_COLLISION_CHECK);
 	if (!err && compat)
-		err = repo_add_loose_object_map(the_repository, oid, &compat_oid);
+		err = repo_add_loose_object_map(the_repository->objects->sources, oid, &compat_oid);
 cleanup:
 	strbuf_release(&tmp_file);
 	strbuf_release(&filename);
@@ -1069,7 +1069,7 @@ int write_object_file_flags(const void *buf, unsigned long len,
 	if (write_loose_object(oid, hdr, hdrlen, buf, len, 0, flags))
 		return -1;
 	if (compat)
-		return repo_add_loose_object_map(repo, oid, &compat_oid);
+		return repo_add_loose_object_map(repo->objects->sources, oid, &compat_oid);
 	return 0;
 }
 
@@ -1103,7 +1103,7 @@ int force_object_loose(const struct object_id *oid, time_t mtime)
 	hdrlen = format_object_header(hdr, sizeof(hdr), type, len);
 	ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime, 0);
 	if (!ret && compat)
-		ret = repo_add_loose_object_map(the_repository, oid, &compat_oid);
+		ret = repo_add_loose_object_map(the_repository->objects->sources, oid, &compat_oid);
 	free(buf);
 
 	return ret;

-- 
2.50.1.327.g047016eb4a.dirty