[PATCH v2 4/4] reset: handle submodule with trailing slash

[John Keeping]

When using tab-completion, a directory path will often end with a
trailing slash which currently confuses "git reset" when dealing with
submodules.  Now that we have parse_pathspec we can easily handle this
by simply adding the PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP flag.

To do this, we need to move the read_cache() call before the
parse_pathspec() call.  All of the existing paths through cmd_reset()
that do not die early already call read_cache() at some point, so there
is no performance impact to doing this in the common case.

Signed-off-by: John Keeping <j...@keeping.me.uk>
---
 builtin/reset.c            | 8 ++++++--
 t/t7400-submodule-basic.sh | 6 ++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/builtin/reset.c b/builtin/reset.c
index 5e4c551..800117f 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -143,7 +143,6 @@ static int read_from_tree(const struct pathspec *pathspec,
        opt.output_format = DIFF_FORMAT_CALLBACK;
        opt.format_callback = update_index_from_diff;
 
-       read_cache();
        if (do_diff_cache(tree_sha1, &opt))
                return 1;
        diffcore_std(&opt);
@@ -169,7 +168,7 @@ static void set_reflog_message(struct strbuf *sb, const 
char *action,
 
 static void die_if_unmerged_cache(int reset_type)
 {
-       if (is_merge() || read_cache() < 0 || unmerged_cache())
+       if (is_merge() || unmerged_cache())
                die(_("Cannot do a %s reset in the middle of a merge."),
                    _(reset_type_names[reset_type]));
 
@@ -220,8 +219,13 @@ static void parse_args(struct pathspec *pathspec,
                }
        }
        *rev_ret = rev;
+
+       if (read_cache() < 0)
+               die(_("index file corrupt"));
+
        parse_pathspec(pathspec, 0,
                       PATHSPEC_PREFER_FULL |
+                      PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP |
                       (patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0),
                       prefix, argv);
 }
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 4192fe0..c268d3c 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -481,7 +481,7 @@ test_expect_success 'do not add files from a submodule' '
 
 '
 
-test_expect_success 'gracefully add submodule with a trailing slash' '
+test_expect_success 'gracefully add/reset submodule with a trailing slash' '
 
        git reset --hard &&
        git commit -m "commit subproject" init &&
@@ -495,7 +495,9 @@ test_expect_success 'gracefully add submodule with a 
trailing slash' '
        git add init/ &&
        test_must_fail git diff --exit-code --cached init &&
        test $commit = $(git ls-files --stage |
-               sed -n "s/^160000 \([^ ]*\).*/\1/p")
+               sed -n "s/^160000 \([^ ]*\).*/\1/p") &&
+       git reset init/ &&
+       git diff --exit-code --cached init
 
 '
 
-- 
1.8.4.277.gfbd6843.dirty

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