[PATCH v4 5/6] pack-objects: create pack.useSparse setting
From: Derrick Stolee via GitGitGadget <hidden>
Date: 2018-12-14 21:22:26
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
From: Derrick Stolee <redacted> 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 <redacted> --- 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 45dba6e014..8f5699bd91 100755
--- a/t/t5322-pack-objects-sparse.sh
+++ b/t/t5322-pack-objects-sparse.sh@@ -121,4 +121,19 @@ 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 expect_objects.txt sparse_objects.txt +' + test_done
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