update-index: optionally leave skip-worktree entries alone

While `git update-index` mostly ignores paths referring to index entries
whose skip-worktree bit is set, in b4d1690df11 (Teach Git to respect
skip-worktree bit (reading part), 2009-08-20), for reasons that are not
entirely obvious, the `--remove` option was made special: it _does_
remove index entries even if their skip-worktree bit is set.

Seeing as this behavior has been in place for a decade now, it does not
make sense to change it.

However, in preparation for fixing a bug in `git stash` where it
pretends that skip-worktree entries have actually been removed, we need
a mode where `git update-index` leaves all skip-worktree entries alone,
even if the `--remove` option was passed.

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

diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index 1c4d146a41ce091755b2e4baef0fa79f45a4b515..08393445e754d9dbbc5b387ad830343af4904c8b 100644 (file)
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -16,6 +16,7 @@ SYNOPSIS
             [--chmod=(+|-)x]
             [--[no-]assume-unchanged]
             [--[no-]skip-worktree]
+            [--[no-]ignore-skip-worktree-entries]
             [--[no-]fsmonitor-valid]
             [--ignore-submodules]
             [--[no-]split-index]
@@ -113,6 +114,11 @@ you will need to handle the situation manually.
        set and unset the "skip-worktree" bit for the paths. See
        section "Skip-worktree bit" below for more information.
 
+
+--[no-]ignore-skip-worktree-entries::
+       Do not remove skip-worktree (AKA "index-only") entries even when
+       the `--remove` option was specified.
+
 --[no-]fsmonitor-valid::
        When one of these flags is specified, the object name recorded
        for the paths are not updated. Instead, these options

diff --git a/builtin/update-index.c b/builtin/update-index.c
index dff2f4b837208deebeb34f4af687c18df7dbfe76..074d563df08570276422bc7bc6311239d2d0d6ee 100644 (file)
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -35,6 +35,7 @@ static int verbose;
 static int mark_valid_only;
 static int mark_skip_worktree_only;
 static int mark_fsmonitor_only;
+static int ignore_skip_worktree_entries;
 #define MARK_FLAG 1
 #define UNMARK_FLAG 2
 static struct strbuf mtime_dir = STRBUF_INIT;
@@ -381,7 +382,8 @@ static int process_path(const char *path, struct stat *st, int stat_errno)
                 * so updating it does not make sense.
                 * On the other hand, removing it from index should work
                 */
-               if (allow_remove && remove_file_from_cache(path))
+               if (!ignore_skip_worktree_entries && allow_remove &&
+                   remove_file_from_cache(path))
                        return error("%s: cannot remove from the index", path);
                return 0;
        }
@@ -1013,6 +1015,8 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
                {OPTION_SET_INT, 0, "no-skip-worktree", &mark_skip_worktree_only, NULL,
                        N_("clear skip-worktree bit"),
                        PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, UNMARK_FLAG},
+               OPT_BOOL(0, "ignore-skip-worktree-entries", &ignore_skip_worktree_entries,
+                        N_("do not touch index-only entries")),
                OPT_SET_INT(0, "info-only", &info_only,
                        N_("add to index only; do not add content to object database"), 1),
                OPT_SET_INT(0, "force-remove", &force_remove,

diff --git a/t/t7012-skip-worktree-writing.sh b/t/t7012-skip-worktree-writing.sh
index 9d1abe50eff6772673df545d3e6715d4d2e6f2db..7476781979c3ff164ce9eeba1079d41f15bdaa5c 100755 (executable)
--- a/t/t7012-skip-worktree-writing.sh
+++ b/t/t7012-skip-worktree-writing.sh
@@ -134,6 +134,21 @@ test_expect_success 'git-clean, dirty case' '
        test_i18ncmp expected result
 '
 
+test_expect_success '--ignore-skip-worktree-entries leaves worktree alone' '
+       test_commit keep-me &&
+       git update-index --skip-worktree keep-me.t &&
+       rm keep-me.t &&
+
+       : ignoring the worktree &&
+       git update-index --remove --ignore-skip-worktree-entries keep-me.t &&
+       git diff-index --cached --exit-code HEAD &&
+
+       : not ignoring the worktree, a deletion is staged &&
+       git update-index --remove keep-me.t &&
+       test_must_fail git diff-index --cached --exit-code HEAD \
+               --diff-filter=D -- keep-me.t
+'
+
 #TODO test_expect_failure 'git-apply adds file' false
 #TODO test_expect_failure 'git-apply updates file' false
 #TODO test_expect_failure 'git-apply removes file' false