git add --intent-to-add: fix removal of cached emptiness

This uses the extended index flag mechanism introduced earlier to mark
the entries added to the index via "git add -N" with CE_INTENT_TO_ADD.

The logic to detect an "intent to add" entry for the purpose of allowing
"git rm --cached $path" is tightened to check not just for a staged empty
blob, but with the CE_INTENT_TO_ADD bit.  This protects an empty blob that
was explicitly added and then modified in the work tree from being dropped
with this sequence:

	$ >empty
	$ git add empty
	$ echo "non empty" >empty
	$ git rm --cached empty

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

diff --git a/builtin-rm.c b/builtin-rm.c
index 3d03da0..c11f455 100644 (file)
--- a/builtin-rm.c
+++ b/builtin-rm.c
@@ -115,7 +115,7 @@ static int check_local_mod(unsigned char *head, int index_only)
                 * "intent to add" entry.
                 */
                if (local_changes && staged_changes) {
-                       if (!index_only || !is_empty_blob_sha1(ce->sha1))
+                       if (!index_only || !(ce->ce_flags & CE_INTENT_TO_ADD))
                                errs = error("'%s' has staged content different "
                                             "from both the file and the HEAD\n"
                                             "(use -f to force removal)", name);

diff --git a/cache.h b/cache.h
index ef2e7f9..f15b3fc 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -176,10 +176,11 @@ struct cache_entry {
 /*
  * Extended on-disk flags
  */
+#define CE_INTENT_TO_ADD 0x20000000
 /* CE_EXTENDED2 is for future extension */
 #define CE_EXTENDED2 0x80000000
 
-#define CE_EXTENDED_FLAGS (0)
+#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD)
 
 /*
  * Safeguard to avoid saving wrong flags:

diff --git a/read-cache.c b/read-cache.c
index abc627b..fa30a0f 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -546,6 +546,8 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
        ce->ce_flags = namelen;
        if (!intent_only)
                fill_stat_cache_info(ce, st);
+       else
+               ce->ce_flags |= CE_INTENT_TO_ADD;
 
        if (trust_executable_bit && has_symlinks)
                ce->ce_mode = create_ce_mode(st_mode);

diff --git a/t/t3600-rm.sh b/t/t3600-rm.sh
index 5b4d6f7..b7d46e5 100755 (executable)
--- a/t/t3600-rm.sh
+++ b/t/t3600-rm.sh
@@ -187,8 +187,8 @@ test_expect_success 'but with -f it should work.' '
        test_must_fail git ls-files --error-unmatch baz
 '
 
-test_expect_failure 'refuse to remove cached empty file with modifications' '
-       touch empty &&
+test_expect_success 'refuse to remove cached empty file with modifications' '
+       >empty &&
        git add empty &&
        echo content >empty &&
        test_must_fail git rm --cached empty