From: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
The '--sparse' flag in 'git pack-objects' changes the algorithm
used to enumerate objects to one that is faster for individual
users pushing new objects that change only a small cone of the
working directory. The sparse algorithm is not recommended for a
server, which likely sends new objects that appear across the
entire working directory.
Create a 'pack.useSparse' setting that enables this new algorithm.
This allows 'git push' to use this algorithm without passing a
'--sparse' flag all the way through four levels of run_command()
calls.
If the '--no-sparse' flag is set, then this config setting is
overridden.
Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
Documentation/config/pack.txt | 9 +++++++++
builtin/pack-objects.c | 4 ++++
t/t5322-pack-objects-sparse.sh | 15 +++++++++++++++
3 files changed, 28 insertions(+)
diff --git a/Documentation/config/pack.txt b/Documentation/config/pack.txt
index edac75c83f..425c73aa52 100644
--- a/Documentation/config/pack.txt
+++ b/Documentation/config/pack.txt
@@ -105,6 +105,15 @@ pack.useBitmaps::
true. You should not generally need to turn this off unless
you are debugging pack bitmaps.
+pack.useSparse::
+ When true, git will default to using the '--sparse' option in
+ 'git pack-objects' when the '--revs' option is present. This
+ algorithm only walks trees that appear in paths that introduce new
+ objects. This can have significant performance benefits when
+ computing a pack to send a small change. However, it is possible
+ that extra objects are added to the pack-file if the included
+ commits contain certain types of direct renames.
+
pack.writeBitmaps (deprecated)::
This is a deprecated synonym for `repack.writeBitmaps`.
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 7d5b0735e3..124b1bafc4 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -2711,6 +2711,10 @@ static int git_pack_config(const char *k, const char *v, void *cb)
use_bitmap_index_default = git_config_bool(k, v);
return 0;
}
+ if (!strcmp(k, "pack.usesparse")) {
+ sparse = git_config_bool(k, v);
+ return 0;
+ }
if (!strcmp(k, "pack.threads")) {
delta_search_threads = git_config_int(k, v);
if (delta_search_threads < 0)
diff --git a/t/t5322-pack-objects-sparse.sh b/t/t5322-pack-objects-sparse.sh
index 9f2a6e5d31..3233fafc90 100755
--- a/t/t5322-pack-objects-sparse.sh
+++ b/t/t5322-pack-objects-sparse.sh
@@ -118,4 +118,19 @@ test_expect_success 'sparse pack-objects' '
test_cmp expect_sparse_objects.txt sparse_objects.txt
'
+test_expect_success 'pack.useSparse enables algorithm' '
+ git config pack.useSparse true &&
+ git pack-objects --stdout --revs <packinput.txt >sparse.pack &&
+ git index-pack -o sparse.idx sparse.pack &&
+ git show-index <sparse.idx | awk "{print \$2}" >sparse_objects.txt &&
+ test_cmp expect_sparse_objects.txt sparse_objects.txt
+'
+
+test_expect_success 'pack.useSparse overridden' '
+ git pack-objects --stdout --revs --no-sparse <packinput.txt >sparse.pack &&
+ git index-pack -o sparse.idx sparse.pack &&
+ git show-index <sparse.idx | awk "{print \$2}" >sparse_objects.txt &&
+ test_cmp required_objects.txt sparse_objects.txt
+'
+
test_done
--
gitgitgadget
