path: implement common_dir handling in git_pathdup_submodule()

When submodule is a linked worktree, "git diff --submodule" and other
calls which directly access the submodule's object database do not correctly
calculate its path. Fix it by changing the git_pathdup_submodule() behavior,
to use either common or per-worktree directory.

Do it similarly as for parent repository, but ignore the GIT_COMMON_DIR
environment variable, because it would mean common directory for the parent
repository and does not make sense for submodule.

Also add test for functionality which uses this call.

Signed-off-by: Max Kirillov <max@max630.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache.h b/cache.h
index 79066e57dc806d118366d9807e0af338b72e2fb2..5eb36b413ce9a26851687d89d49fc964ed745098 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -443,6 +443,7 @@ extern char *get_object_directory(void);
 extern char *get_index_file(void);
 extern char *get_graft_file(void);
 extern int set_git_dir(const char *path);
+extern int get_common_dir_noenv(struct strbuf *sb, const char *gitdir);
 extern int get_common_dir(struct strbuf *sb, const char *gitdir);
 extern const char *get_git_namespace(void);
 extern const char *strip_namespace(const char *namespaced_ref);

diff --git a/path.c b/path.c
index 95acbafa6883b4418f19a208cb9889f5642f3925..22b9e0b8d8d392a31cb61a91fb9aeb32529e2d5b 100644 (file)
--- a/path.c
+++ b/path.c
@@ -98,7 +98,7 @@ static const char *common_list[] = {
        NULL
 };
 
-static void update_common_dir(struct strbuf *buf, int git_dir_len)
+static void update_common_dir(struct strbuf *buf, int git_dir_len, const char *common_dir)
 {
        char *base = buf->buf + git_dir_len;
        const char **p;
@@ -115,12 +115,16 @@ static void update_common_dir(struct strbuf *buf, int git_dir_len)
                        path++;
                        is_dir = 1;
                }
+
+               if (!common_dir)
+                       common_dir = get_git_common_dir();
+
                if (is_dir && dir_prefix(base, path)) {
-                       replace_dir(buf, git_dir_len, get_git_common_dir());
+                       replace_dir(buf, git_dir_len, common_dir);
                        return;
                }
                if (!is_dir && !strcmp(base, path)) {
-                       replace_dir(buf, git_dir_len, get_git_common_dir());
+                       replace_dir(buf, git_dir_len, common_dir);
                        return;
                }
        }
@@ -160,7 +164,7 @@ static void adjust_git_path(struct strbuf *buf, int git_dir_len)
        else if (git_db_env && dir_prefix(base, "objects"))
                replace_dir(buf, git_dir_len + 7, get_object_directory());
        else if (git_common_dir_env)
-               update_common_dir(buf, git_dir_len);
+               update_common_dir(buf, git_dir_len, NULL);
 }
 
 static void do_git_path(struct strbuf *buf, const char *fmt, va_list args)
@@ -228,6 +232,8 @@ static void do_submodule_path(struct strbuf *buf, const char *path,
                              const char *fmt, va_list args)
 {
        const char *git_dir;
+       struct strbuf git_submodule_common_dir = STRBUF_INIT;
+       struct strbuf git_submodule_dir = STRBUF_INIT;
 
        strbuf_addstr(buf, path);
        if (buf->len && buf->buf[buf->len - 1] != '/')
@@ -240,9 +246,17 @@ static void do_submodule_path(struct strbuf *buf, const char *path,
                strbuf_addstr(buf, git_dir);
        }
        strbuf_addch(buf, '/');
+       strbuf_addstr(&git_submodule_dir, buf->buf);
 
        strbuf_vaddf(buf, fmt, args);
+
+       if (get_common_dir_noenv(&git_submodule_common_dir, git_submodule_dir.buf))
+               update_common_dir(buf, git_submodule_dir.len, git_submodule_common_dir.buf);
+
        strbuf_cleanup_path(buf);
+
+       strbuf_release(&git_submodule_dir);
+       strbuf_release(&git_submodule_common_dir);
 }
 
 char *git_pathdup_submodule(const char *path, const char *fmt, ...)

diff --git a/setup.c b/setup.c
index a17c51e61d75ac8280bf04d95c50d7bdfd6d7a0e..e41e5e1a82e3cbd9e0168e158b336f621116adc7 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -228,15 +228,22 @@ void verify_non_filename(const char *prefix, const char *arg)
 }
 
 int get_common_dir(struct strbuf *sb, const char *gitdir)
+{
+       const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
+       if (git_env_common_dir) {
+               strbuf_addstr(sb, git_env_common_dir);
+               return 1;
+       } else {
+               return get_common_dir_noenv(sb, gitdir);
+       }
+}
+
+int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
 {
        struct strbuf data = STRBUF_INIT;
        struct strbuf path = STRBUF_INIT;
-       const char *git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
        int ret = 0;
-       if (git_common_dir) {
-               strbuf_addstr(sb, git_common_dir);
-               return 1;
-       }
+
        strbuf_addf(&path, "%s/commondir", gitdir);
        if (file_exists(path.buf)) {
                if (strbuf_read_file(&data, path.buf, 0) <= 0)

diff --git a/t/t7410-submodule-checkout-to.sh b/t/t7410-submodule-checkout-to.sh
index 3f609e8909c463e7d396915d273d82785b238000..1acef32647aee6ef33638fd35be4d3e3ad61c726 100755 (executable)
--- a/t/t7410-submodule-checkout-to.sh
+++ b/t/t7410-submodule-checkout-to.sh
@@ -47,4 +47,14 @@ test_expect_success 'checkout main and initialize independed clones' \
 test_expect_success 'can see submodule diffs after independed cloning' \
     '(cd fully_cloned_submodule/main && git diff --submodule master"^!" | grep "file1 updated")'
 
+test_expect_success 'checkout sub manually' \
+    'mkdir linked_submodule &&
+    (cd clone/main &&
+       git worktree add "$base_path/linked_submodule/main" "$rev1_hash_main") &&
+    (cd clone/main/sub &&
+       git worktree add "$base_path/linked_submodule/main/sub" "$rev1_hash_sub")'
+
+test_expect_success 'can see submodule diffs after manual checkout of linked submodule' \
+    '(cd linked_submodule/main && git diff --submodule master"^!" | grep "file1 updated")'
+
 test_done