The bitmap index only works for single packs, so requesting an
incremental repack with bitmap indexes makes no sense.

Signed-off-by: David Turner <dtur...@twosigma.com>
---
 builtin/repack.c        | 9 +++++++++
 t/t5310-pack-bitmaps.sh | 8 +++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/builtin/repack.c b/builtin/repack.c
index 80dd06b..9c3dd09 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -18,6 +18,12 @@ static const char *const git_repack_usage[] = {
        NULL
 };
 
+static const char incremental_bitmap_conflict_error[] = N_(
+"Incremental repacks are incompatible with bitmap indexes.  Use \n"
+"--no-write-bitmap-index or disable the pack.writebitmaps configuration."
+);
+
+
 static int repack_config(const char *var, const char *value, void *cb)
 {
        if (!strcmp(var, "repack.usedeltabaseoffset")) {
@@ -206,6 +212,9 @@ int cmd_repack(int argc, const char **argv, const char 
*prefix)
        if (pack_kept_objects < 0)
                pack_kept_objects = write_bitmaps;
 
+       if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
+               die(incremental_bitmap_conflict_error);
+
        packdir = mkpathdup("%s/pack", get_object_directory());
        packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 
diff --git a/t/t5310-pack-bitmaps.sh b/t/t5310-pack-bitmaps.sh
index b4c7a6f..424bec7 100755
--- a/t/t5310-pack-bitmaps.sh
+++ b/t/t5310-pack-bitmaps.sh
@@ -118,12 +118,10 @@ test_expect_success 'fetch (partial bitmap)' '
        test_cmp expect actual
 '
 
-test_expect_success 'incremental repack cannot create bitmaps' '
+test_expect_success 'incremental repack fails when bitmaps are requested' '
        test_commit more-1 &&
-       find .git/objects/pack -name "*.bitmap" >expect &&
-       git repack -d &&
-       find .git/objects/pack -name "*.bitmap" >actual &&
-       test_cmp expect actual
+       test_must_fail git repack -d 2>err &&
+       test_i18ngrep "Incremental repacks are incompatible with bitmap" err
 '
 
 test_expect_success 'incremental repack can disable bitmaps' '
-- 
2.8.0.rc4.22.g8ae061a

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