[PATCH 04/20] path.c: add is_git_path_shared()

[Nguyễn Thái Ngọc Duy]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 cache.h |  2 ++
 path.c  | 27 ++++++++++++++++++++++-----
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/cache.h b/cache.h
index ec71181..c75d13f 100644
--- a/cache.h
+++ b/cache.h
@@ -748,6 +748,8 @@ extern int check_repository_format(void);
 extern const char *mkpath(const char *fmt, ...) __attribute__((format (printf, 
1, 2)));
 extern const char *git_path(const char *fmt, ...) __attribute__((format 
(printf, 1, 2)));
 extern const char *git_common_path(const char *fmt, ...) __attribute__((format 
(printf, 1, 2)));
+extern int is_git_path_shared(const char *path);
+
 
 extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
        __attribute__((format (printf, 3, 4)));
diff --git a/path.c b/path.c
index 08ff346..9e350e7 100644
--- a/path.c
+++ b/path.c
@@ -335,15 +335,18 @@ static int check_common(const char *unmatched, void 
*value, void *baton)
        return 0;
 }
 
-static void update_common_dir(struct strbuf *buf, int git_dir_len,
-                             const char *common_dir)
+static int update_common_dir(struct strbuf *buf, int git_dir_len,
+                            const char *common_dir)
 {
        char *base = buf->buf + git_dir_len;
        init_common_trie();
        if (!common_dir)
                common_dir = get_git_common_dir();
-       if (trie_find(&common_trie, base, check_common, NULL) > 0)
+       if (trie_find(&common_trie, base, check_common, NULL) > 0) {
                replace_dir(buf, git_dir_len, common_dir);
+               return 1;
+       }
+       return 0;
 }
 
 void report_linked_checkout_garbage(void)
@@ -368,7 +371,7 @@ void report_linked_checkout_garbage(void)
        strbuf_release(&sb);
 }
 
-static void adjust_git_path(struct strbuf *buf, int git_dir_len)
+static int adjust_git_path(struct strbuf *buf, int git_dir_len)
 {
        const char *base = buf->buf + git_dir_len;
        if (git_graft_env && is_dir_file(base, "info", "grafts"))
@@ -380,7 +383,10 @@ 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, NULL);
+               return update_common_dir(buf, git_dir_len, NULL);
+       else
+               return 0;
+       return 1;
 }
 
 static void do_git_path(struct strbuf *buf, const char *fmt, va_list args)
@@ -532,6 +538,17 @@ void strbuf_git_common_path(struct strbuf *sb, const char 
*fmt, ...)
        va_end(args);
 }
 
+int is_git_path_shared(const char *path)
+{
+       struct strbuf buf = STRBUF_INIT;
+       int ret;
+
+       strbuf_addf(&buf, ".git/%s", path);
+       ret = adjust_git_path(&buf, 5);
+       strbuf_release(&buf);
+       return ret;
+}
+
 int validate_headref(const char *path)
 {
        struct stat st;
-- 
2.7.0.377.g4cd97dd

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