builtin-reset: avoid forking "update-index --refresh"

Instead of forking update-index, call refresh_cache() directly.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-reset.c b/builtin-reset.c
index 79792eebf2466edebef73546908cfe63ab08de65..44582f23a21c97507351773e2c0a342a1eaa8c64 100644 (file)
--- a/builtin-reset.c
+++ b/builtin-reset.c
@@ -95,26 +95,34 @@ static void print_new_head_line(struct commit *commit)
                printf("\n");
 }
 
-static int update_index_refresh(void)
+static int update_index_refresh(int fd, struct lock_file *index_lock)
 {
-       const char *argv_update_index[] = {"update-index", "--refresh", NULL};
-       return run_command_v_opt(argv_update_index, RUN_GIT_CMD);
-}
+       int result;
+
+       if (!index_lock) {
+               index_lock = xcalloc(1, sizeof(struct lock_file));
+               fd = hold_locked_index(index_lock, 1);
+       }
 
-struct update_cb_data {
-       int index_fd;
-       struct lock_file *lock;
-       int exit_code;
-};
+       if (read_cache() < 0)
+               return error("Could not read index");
+       result = refresh_cache(0) ? 1 : 0;
+       if (write_cache(fd, active_cache, active_nr) ||
+                       close(fd) ||
+                       commit_locked_index(index_lock))
+               return error ("Could not refresh index");
+       return result;
+}
 
 static void update_index_from_diff(struct diff_queue_struct *q,
                struct diff_options *opt, void *data)
 {
        int i;
-       struct update_cb_data *cb = data;
+       int *discard_flag = data;
 
        /* do_diff_cache() mangled the index */
        discard_cache();
+       *discard_flag = 1;
        read_cache();
 
        for (i = 0; i < q->nr; i++) {
@@ -128,34 +136,33 @@ static void update_index_from_diff(struct diff_queue_struct *q,
                } else
                        remove_file_from_cache(one->path);
        }
-
-       cb->exit_code = write_cache(cb->index_fd, active_cache, active_nr) ||
-               close(cb->index_fd) ||
-               commit_locked_index(cb->lock);
 }
 
 static int read_from_tree(const char *prefix, const char **argv,
                unsigned char *tree_sha1)
 {
+       struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+       int index_fd, index_was_discarded = 0;
        struct diff_options opt;
-       struct update_cb_data cb;
 
        memset(&opt, 0, sizeof(opt));
        diff_tree_setup_paths(get_pathspec(prefix, (const char **)argv), &opt);
        opt.output_format = DIFF_FORMAT_CALLBACK;
        opt.format_callback = update_index_from_diff;
-       opt.format_callback_data = &cb;
+       opt.format_callback_data = &index_was_discarded;
 
-       cb.lock = xcalloc(1, sizeof(struct lock_file));
-       cb.index_fd = hold_locked_index(cb.lock, 1);
-       cb.exit_code = 0;
+       index_fd = hold_locked_index(lock, 1);
+       index_was_discarded = 0;
        read_cache();
        if (do_diff_cache(tree_sha1, &opt))
                return 1;
        diffcore_std(&opt);
        diff_flush(&opt);
 
-       return cb.exit_code;
+       if (!index_was_discarded)
+               /* The index is still clobbered from do_diff_cache() */
+               discard_cache();
+       return update_index_refresh(index_fd, lock);
 }
 
 static void prepend_reflog_action(const char *action, char *buf, size_t size)
@@ -225,9 +232,7 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
                else if (reset_type != NONE)
                        die("Cannot do %s reset with paths.",
                                        reset_type_names[reset_type]);
-               if (read_from_tree(prefix, argv + i, sha1))
-                       return 1;
-               return update_index_refresh() ? 1 : 0;
+               return read_from_tree(prefix, argv + i, sha1);
        }
        if (reset_type == NONE)
                reset_type = MIXED; /* by default */
@@ -264,7 +269,7 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
        case SOFT: /* Nothing else to do. */
                break;
        case MIXED: /* Report what has not been updated. */
-               update_index_refresh();
+               update_index_refresh(0, NULL);
                break;
        }
 

diff --git a/t/t7102-reset.sh b/t/t7102-reset.sh
index 506767d2d7085724187d451a5972eaedd513ce81..e5c9f30c73d4dbfe1fff6022bddfe6a387441a9b 100755 (executable)
--- a/t/t7102-reset.sh
+++ b/t/t7102-reset.sh
@@ -418,4 +418,14 @@ test_expect_success 'resetting an unmodified path is a no-op' '
        git diff-index --cached --exit-code HEAD
 '
 
+cat > expect << EOF
+file2: needs update
+EOF
+
+test_expect_success '--mixed refreshes the index' '
+       echo 123 >> file2 &&
+       git reset --mixed HEAD > output &&
+       git diff --exit-code expect output
+'
+
 test_done