repack: enable bitmaps by default on bare repos

A typical use case for bare repos is for serving clones and
fetches to clients.  Enable bitmaps by default on bare repos to
make it easier for admins to host git repos in a performant way.

Signed-off-by: Eric Wong <e@80x24.org>
Helped-by: Jeff King <peff@peff.net>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config/repack.txt b/Documentation/config/repack.txt
index a5c3781..9c413e1 100644 (file)
--- a/Documentation/config/repack.txt
+++ b/Documentation/config/repack.txt
@@ -24,4 +24,4 @@ repack.writeBitmaps::
        packs created for clones and fetches, at the cost of some disk
        space and extra time spent on the initial repack.  This has
        no effect if multiple packfiles are created.
-       Defaults to false.
+       Defaults to true on bare repos, false otherwise.

diff --git a/builtin/repack.c b/builtin/repack.c
index 67f8978..caca113 100644 (file)
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -14,7 +14,7 @@
 
 static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
-static int write_bitmaps;
+static int write_bitmaps = -1;
 static int use_delta_islands;
 static char *packdir, *packtmp;
 
@@ -343,6 +343,9 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
            (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
                die(_("--keep-unreachable and -A are incompatible"));
 
+       if (write_bitmaps < 0)
+               write_bitmaps = (pack_everything & ALL_INTO_ONE) &&
+                                is_bare_repository();
        if (pack_kept_objects < 0)
                pack_kept_objects = write_bitmaps;
 

diff --git a/t/t7700-repack.sh b/t/t7700-repack.sh
index 6162e2a..86d0516 100755 (executable)
--- a/t/t7700-repack.sh
+++ b/t/t7700-repack.sh
@@ -221,5 +221,22 @@ test_expect_success 'repack --keep-pack' '
        )
 '
 
-test_done
+test_expect_success 'bitmaps are created by default in bare repos' '
+       git clone --bare .git bare.git &&
+       git -C bare.git repack -ad &&
+       bitmap=$(ls bare.git/objects/pack/*.bitmap) &&
+       test_path_is_file "$bitmap"
+'
+
+test_expect_success 'incremental repack does not complain' '
+       git -C bare.git repack -q 2>repack.err &&
+       test_must_be_empty repack.err
+'
 
+test_expect_success 'bitmaps can be disabled on bare repos' '
+       git -c repack.writeBitmaps=false -C bare.git repack -ad &&
+       bitmap=$(ls bare.git/objects/pack/*.bitmap 2>/dev/null || :) &&
+       test -z "$bitmap"
+'
+
+test_done