Signed-off-by: Elijah Newren <new...@gmail.com>
---
 git-merge-octopus.sh        | 14 +++++++++++---
 t/t6043-merge-index-only.sh |  4 ++--
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/git-merge-octopus.sh b/git-merge-octopus.sh
index a1d7702..e7915dc 100755
--- a/git-merge-octopus.sh
+++ b/git-merge-octopus.sh
@@ -13,6 +13,14 @@ die () {
     exit 1
 }
 
+read_tree_update="-u"
+index_only=
+if test "$1" = "--index-only"; then
+       read_tree_update="-i"
+       index_only="--index-only"
+       shift
+fi
+
 # The first parameters up to -- are merge bases; the rest are heads.
 bases= head= remotes= sep_seen=
 for arg
@@ -89,7 +97,7 @@ do
                # We still need to count this as part of the parent set.
 
                echo "Fast-forwarding to: $pretty_name"
-               git read-tree -u -m $head $SHA1 || exit
+               git read-tree $read_tree_update -m $head $SHA1 || exit
                MRC=$SHA1 MRT=$(git write-tree)
                continue
        fi
@@ -97,12 +105,12 @@ do
        NON_FF_MERGE=1
 
        echo "Trying simple merge with $pretty_name"
-       git read-tree -u -m --aggressive  $common $MRT $SHA1 || exit 2
+       git read-tree $read_tree_update -m --aggressive  $common $MRT $SHA1 || 
exit 2
        next=$(git write-tree 2>/dev/null)
        if test $? -ne 0
        then
                echo "Simple merge did not work, trying automatic merge."
-               git-merge-index -o git-merge-one-file -a ||
+               git-merge-index -o git-merge-one-file $index_only -a ||
                OCTOPUS_FAILURE=1
                next=$(git write-tree 2>/dev/null)
        fi
diff --git a/t/t6043-merge-index-only.sh b/t/t6043-merge-index-only.sh
index c0a553b..080e03d 100755
--- a/t/t6043-merge-index-only.sh
+++ b/t/t6043-merge-index-only.sh
@@ -333,7 +333,7 @@ test_expect_success '--index-only w/ resolve, non-trivial, 
bare' '
        )
 '
 
-test_expect_failure '--index-only octopus, non-bare' '
+test_expect_success '--index-only octopus, non-bare' '
        git reset --hard &&
        git checkout B^0 &&
 
@@ -351,7 +351,7 @@ test_expect_failure '--index-only octopus, non-bare' '
        test ! -f d
 '
 
-test_expect_failure '--index-only octopus, bare' '
+test_expect_success '--index-only octopus, bare' '
        rm -rf bare.clone &&
        git clone --bare . bare.clone &&
        (cd bare.clone &&
-- 
2.8.0.18.gc685494

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