add_to_alternates_file: don't add duplicate entries

diff --git a/cache.h b/cache.h
index 8db884e3ded71f35428434f731ede37e406636cb..6f74f33f41f5af40367b6abb32c338b5ff26bcef 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -724,10 +724,15 @@ extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
        __attribute__((format (printf, 3, 4)));
 extern void strbuf_git_path(struct strbuf *sb, const char *fmt, ...)
        __attribute__((format (printf, 2, 3)));
+extern void strbuf_git_path_submodule(struct strbuf *sb, const char *path,
+                                     const char *fmt, ...)
+       __attribute__((format (printf, 3, 4)));
 extern char *git_pathdup(const char *fmt, ...)
        __attribute__((format (printf, 1, 2)));
 extern char *mkpathdup(const char *fmt, ...)
        __attribute__((format (printf, 1, 2)));
+extern char *git_pathdup_submodule(const char *path, const char *fmt, ...)
+       __attribute__((format (printf, 2, 3)));
 
 extern void report_linked_checkout_garbage(void);