Revert "checkout branch: prime cache-tree fully"

The logic in 83ae209 (checkout branch: prime cache-tree fully,
2009-04-20) is bogus; checkout can switch branches with a dirty
index and in such a case the tree won't match HEAD.

Add t2014-switch to catch this breakage.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-checkout.c b/builtin-checkout.c
index efa1ebfe07f99e5092710fb951f9e23f16dd1b85..ffdb33aef596740890362a0e237d33131a906f45 100644 (file)
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -368,17 +368,14 @@ static int merge_working_tree(struct checkout_opts *opts,
        int ret;
        struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
        int newfd = hold_locked_index(lock_file, 1);
-       int reprime_cache_tree = 0;
 
        if (read_cache() < 0)
                return error("corrupt index file");
 
-       cache_tree_free(&active_cache_tree);
        if (opts->force) {
                ret = reset_tree(new->commit->tree, opts, 1);
                if (ret)
                        return ret;
-               reprime_cache_tree = 1;
        } else {
                struct tree_desc trees[2];
                struct tree *tree;
@@ -414,9 +411,7 @@ static int merge_working_tree(struct checkout_opts *opts,
                init_tree_desc(&trees[1], tree->buffer, tree->size);
 
                ret = unpack_trees(2, trees, &topts);
-               if (ret != -1) {
-                       reprime_cache_tree = 1;
-               } else {
+               if (ret == -1) {
                        /*
                         * Unpack couldn't do a trivial merge; either
                         * give up or do a real merge, depending on
@@ -460,8 +455,6 @@ static int merge_working_tree(struct checkout_opts *opts,
                }
        }
 
-       if (reprime_cache_tree)
-               prime_cache_tree(&active_cache_tree, new->commit->tree);
        if (write_cache(newfd, active_cache, active_nr) ||
            commit_locked_index(lock_file))
                die("unable to write new index file");

diff --git a/t/t2014-switch.sh b/t/t2014-switch.sh
new file mode 100755 (executable)
index 0000000..ccfb147
--- /dev/null
+++ b/t/t2014-switch.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+
+test_description='Peter MacMillan'
+. ./test-lib.sh
+
+test_expect_success setup '
+       echo Hello >file &&
+       git add file &&
+       test_tick &&
+       git commit -m V1 &&
+       echo Hello world >file &&
+       git add file &&
+       git checkout -b other
+'
+
+test_expect_success 'check all changes are staged' '
+       git diff --exit-code
+'
+
+test_expect_success 'second commit' '
+       git commit -m V2
+'
+
+test_expect_success 'check' '
+       git diff --cached --exit-code
+'
+
+test_done