[PATCH v3 0/2] Address recovery failures with directory/file conflicts

[Elijah Newren]

This patch series fixes several "recovery" commands that outright fail
or do not fully recover when directory-file conflicts are present.
This includes:
   * git read-tree --reset HEAD
   * git am --skip
   * git am --abort
   * git merge --abort (or git reset --merge)
   * git reset --hard

Changes since v2 (full range-diff below):
  - Backported to maint (there were some textual conflicts in t6042
    due to the merging of en/merge-recursive-tests to master), because
    of this comment from Junio's what's cooking email:

    "This may have to be rebased on an older maintenance track before
     moving forward."

Elijah Newren (2):
  t1015: demonstrate directory/file conflict recovery failures
  read-cache: fix directory/file conflict handling in
    read_index_unmerged()

 read-cache.c                         |  13 +--
 t/t1015-read-index-unmerged.sh       | 123 +++++++++++++++++++++++++++
 t/t6020-merge-df.sh                  |   3 -
 t/t6042-merge-rename-corner-cases.sh |   2 -
 4 files changed, 131 insertions(+), 10 deletions(-)
 create mode 100755 t/t1015-read-index-unmerged.sh

1:  4a1c9c3368 ! 1:  00f94a8b41 t1015: demonstrate directory/file conflict 
recovery failures
    @@ -14,7 +14,6 @@
     
         Signed-off-by: Elijah Newren <new...@gmail.com>
         Signed-off-by: Junio C Hamano <gits...@pobox.com>
    -    Message-Id: <20180713163331.22446-2-new...@gmail.com>
     
     diff --git a/t/t1015-read-index-unmerged.sh 
b/t/t1015-read-index-unmerged.sh
     new file mode 100755
2:  e105e8bfbd ! 2:  d3b8d7edb6 read-cache: fix directory/file conflict 
handling in read_index_unmerged()
    @@ -59,7 +59,6 @@
     
         Signed-off-by: Elijah Newren <new...@gmail.com>
         Signed-off-by: Junio C Hamano <gits...@pobox.com>
    -    Message-Id: <20180713163331.22446-3-new...@gmail.com>
     
     diff --git a/read-cache.c b/read-cache.c
     --- a/read-cache.c
    @@ -150,10 +149,18 @@
     --- a/t/t6042-merge-rename-corner-cases.sh
     +++ b/t/t6042-merge-rename-corner-cases.sh
     @@
    -   (
    -           cd rename-directory-1 &&
    + '
    +
    + test_expect_success 'rename/directory conflict + clean content merge' '
    +-  git reset --hard &&
    +   git reset --hard &&
    +   git clean -fdqx &&
      
    --          git reset --hard &&
    -           git reset --hard &&
    -           git clean -fdqx &&
    +@@
    + '
    +
    + test_expect_success 'rename/directory conflict + content merge conflict' '
    +-  git reset --hard &&
    +   git reset --hard &&
    +   git clean -fdqx &&
      
-- 
2.18.0.2.gf4c50c7885