[PATCH 04/44] sha1_file.c: move delayed getenv(altdb) back to setup_git_env()

[Nguyễn Thái Ngọc Duy]

getenv() is supposed to work on the main repository only. This delayed
getenv() code in sha1_file.c makes it more difficult to convert
sha1_file.c to a generic object store that could be used by both
submodule and main repositories.

Move the getenv() back in setup_git_env() where other env vars are
also fetched.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 environment.c | 1 +
 repository.c  | 3 +++
 repository.h  | 4 ++++
 sha1_file.c   | 6 +-----
 4 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/environment.c b/environment.c
index da3f7daa09..a5eaa97fb1 100644
--- a/environment.c
+++ b/environment.c
@@ -174,6 +174,7 @@ void setup_git_env(const char *git_dir)
        args.object_dir = getenv_safe(&to_free, DB_ENVIRONMENT);
        args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);
        args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);
+       args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);
        repo_set_gitdir(the_repository, git_dir, &args);
        argv_array_clear(&to_free);
 
diff --git a/repository.c b/repository.c
index e65f4138a7..04d85a2869 100644
--- a/repository.c
+++ b/repository.c
@@ -60,6 +60,8 @@ void repo_set_gitdir(struct repository *repo,
        repo_set_commondir(repo, o->commondir);
        expand_base_dir(&repo->objectdir, o->object_dir,
                        repo->commondir, "objects");
+       free(repo->alternate_db);
+       repo->alternate_db = xstrdup_or_null(o->alternate_db);
        expand_base_dir(&repo->graft_file, o->graft_file,
                        repo->commondir, "info/grafts");
        expand_base_dir(&repo->index_file, o->index_file,
@@ -215,6 +217,7 @@ void repo_clear(struct repository *repo)
        FREE_AND_NULL(repo->gitdir);
        FREE_AND_NULL(repo->commondir);
        FREE_AND_NULL(repo->objectdir);
+       FREE_AND_NULL(repo->alternate_db);
        FREE_AND_NULL(repo->graft_file);
        FREE_AND_NULL(repo->index_file);
        FREE_AND_NULL(repo->worktree);
diff --git a/repository.h b/repository.h
index 84aeac2825..2bfbf762f3 100644
--- a/repository.h
+++ b/repository.h
@@ -26,6 +26,9 @@ struct repository {
         */
        char *objectdir;
 
+       /* Path to extra alternate object database if not NULL */
+       char *alternate_db;
+
        /*
         * Path to the repository's graft file.
         * Cannot be NULL after initialization.
@@ -93,6 +96,7 @@ struct set_gitdir_args {
        const char *object_dir;
        const char *graft_file;
        const char *index_file;
+       const char *alternate_db;
 };
 
 extern void repo_set_gitdir(struct repository *repo,
diff --git a/sha1_file.c b/sha1_file.c
index 831d9e7343..4af422e3cf 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -667,15 +667,11 @@ int foreach_alt_odb(alt_odb_fn fn, void *cb)
 
 void prepare_alt_odb(void)
 {
-       const char *alt;
-
        if (alt_odb_tail)
                return;
 
-       alt = getenv(ALTERNATE_DB_ENVIRONMENT);
-
        alt_odb_tail = &alt_odb_list;
-       link_alt_odb_entries(alt, PATH_SEP, NULL, 0);
+       link_alt_odb_entries(the_repository->alternate_db, PATH_SEP, NULL, 0);
 
        read_info_alternates(get_object_directory(), 0);
 }
-- 
2.16.1.435.g8f24da2e1a