repack: turn exts array into array-of-struct

This is slightly more verbose, but will let us annotate the
extensions with further options in future commits.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/repack.c

@@ -115,7 +115,12 @@ static void remove_redundant_pack(const char *dir_name, const char *base_name)
 
 int cmd_repack(int argc, const char **argv, const char *prefix)
 {
-	const char *exts[] = {".pack", ".idx"};
+	struct {
+		const char *name;
+	} exts[] = {
+		{".pack"},
+		{".idx"},
+	};
 	struct child_process cmd;
 	struct string_list_item *item;
 	struct argv_array cmd_args = ARGV_ARRAY_INIT;
@@ -261,14 +266,14 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 		for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 			char *fname, *fname_old;
 			fname = mkpathdup("%s/%s%s", packdir,
-						item->string, exts[ext]);
+						item->string, exts[ext].name);
 			if (!file_exists(fname)) {
 				free(fname);
 				continue;
 			}
 
 			fname_old = mkpath("%s/old-%s%s", packdir,
-						item->string, exts[ext]);
+						item->string, exts[ext].name);
 			if (file_exists(fname_old))
 				if (unlink(fname_old))
 					failed = 1;
@@ -319,9 +324,9 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 			char *fname, *fname_old;
 			struct stat statbuffer;
 			fname = mkpathdup("%s/pack-%s%s",
-					packdir, item->string, exts[ext]);
+					packdir, item->string, exts[ext].name);
 			fname_old = mkpathdup("%s-%s%s",
-					packtmp, item->string, exts[ext]);
+					packtmp, item->string, exts[ext].name);
 			if (!stat(fname_old, &statbuffer)) {
 				statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 				chmod(fname_old, statbuffer.st_mode);
@@ -340,7 +345,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 			fname = mkpath("%s/old-pack-%s%s",
 					packdir,
 					item->string,
-					exts[ext]);
+					exts[ext].name);
 			if (remove_path(fname))
 				warning(_("removing '%s' failed"), fname);
 		}