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[PATCH 1/2] partial-clone: set default filter with --partial

From
Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Date
Mar 19, 2020, 17:28 UTC
Message-ID
<6f340d9aadf71d394ad320ad162f1d140b632f2c.1584638887.git.gitgitgadget@gmail.com>
In-Reply-To
<pull.586.git.1584638887.gitgitgadget@gmail.com>
From: Derrick Stolee <dstolee@microsoft.com>

Partial clone means a lot of different things, including filtering out all blobs, large blobs, or objects along a certain pathspec. The pathspec option has limited uses, in particular due to the performance challenges in serving with such filters. The blob size option can be helpful for repositories with a small number of large binaries, but otherwise it is difficult to find a meaningful split between "small" and "large" blobs.

When I think of or recommend partial clone, I specifically mention the case of filtering out all blobs, and downloading those blobs only as needed.

This case is extremely useful, since it takes the best part of shallow clone (a very small initial download) without any of the downsides of restricted history.

However, the command-line interface can be confusing:
	git clone --filter=blob:none <url>
Add a simpler "--partial" option that defaults to this case:
	git clone --partial <url>

This should make the feature more discoverable. However, there is a significant interest in the size-limited filters as that behaves very similarly to Git LFS. For those cases, the following is available:

	git clone --partial=<size> <url>

There are quite a few commands using OPT_PARSE_LIST_OBJECTS_FILTER, includeing clone, fetch, and pack-objects. Augment this macro to include the "--partial[=<size>]" mode for free.

Modify the first partial clone test that checks --filter=blob:none to also check --partial with the same expected conditions after clone. The diff is much simpler to see when ignoring whitespace, since several lines added a leading tab. This test is essentially copied to include the two ways to specify a blob size limit of one byte.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 list-objects-filter-options.c | 18 +++++++++++++++
 list-objects-filter-options.h |  8 ++++++-
 t/t5616-partial-clone.sh      | 42 ++++++++++++++++++++++++++---------
 3 files changed, 57 insertions(+), 11 deletions(-)
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index 256bcfbdfe6..a71716ef75e 100644
--- a/list-objects-filter-options.c
+++ b/list-objects-filter-options.c
@@ -270,6 +270,24 @@ int opt_parse_list_objects_filter(const struct option *opt,
 	return 0;
 }
 
+int opt_set_blob_none_filter(const struct option *opt,
+			     const char *arg, int unset)
+{
+	struct strbuf filter_arg = STRBUF_INIT;
+	struct list_objects_filter_options *filter_options = opt->value;
+	
+	if (unset || !arg || !strcmp(arg, "0")) {
+		parse_list_objects_filter(filter_options, "blob:none");
+		return 0;
+	}
+	
+	strbuf_addf(&filter_arg, "blob:limit=%s", arg);
+	parse_list_objects_filter(filter_options, filter_arg.buf);
+	strbuf_release(&filter_arg);
+
+	return 0;
+}
+
 const char *list_objects_filter_spec(struct list_objects_filter_options *filter)
 {
 	if (!filter->filter_spec.nr)
diff --git a/list-objects-filter-options.h b/list-objects-filter-options.h
index 2ffb39222c4..ac38ffcbe86 100644
--- a/list-objects-filter-options.h
+++ b/list-objects-filter-options.h
@@ -62,6 +62,7 @@ struct list_objects_filter_options {
 
 /* Normalized command line arguments */
 #define CL_ARG__FILTER "filter"
+#define CL_ARG__PARTIAL "partial"
 
 void list_objects_filter_die_if_populated(
 	struct list_objects_filter_options *filter_options);
@@ -80,11 +81,16 @@ void parse_list_objects_filter(
 
 int opt_parse_list_objects_filter(const struct option *opt,
 				  const char *arg, int unset);
+int opt_set_blob_none_filter(const struct option *opt,
+			     const char *arg, int unset);
 
 #define OPT_PARSE_LIST_OBJECTS_FILTER(fo) \
 	{ OPTION_CALLBACK, 0, CL_ARG__FILTER, fo, N_("args"), \
 	  N_("object filtering"), 0, \
-	  opt_parse_list_objects_filter }
+	  opt_parse_list_objects_filter }, \
+	{ OPTION_CALLBACK, 0, CL_ARG__PARTIAL, fo, N_("size"), \
+	  N_("partial clone with blob filter"), \
+	  PARSE_OPT_OPTARG | PARSE_OPT_NONEG , opt_set_blob_none_filter }
 
 /*
  * Translates abbreviated numbers in the filter's filter_spec into their
diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 77bb91e9769..c42cef61296 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -33,17 +33,39 @@ test_expect_success 'setup bare clone for server' '
 # confirm we are missing all of the known blobs.
 # confirm partial clone was registered in the local config.
 test_expect_success 'do partial clone 1' '
-	git clone --no-checkout --filter=blob:none "file://$(pwd)/srv.bare" pc1 &&
-
-	git -C pc1 rev-list --quiet --objects --missing=print HEAD >revs &&
-	awk -f print_1.awk revs |
-	sed "s/?//" |
-	sort >observed.oids &&
+	for option in "--filter=blob:none" "--partial"
+	do
+		rm -rf pc1 &&
+		git clone --no-checkout "$option" "file://$(pwd)/srv.bare" pc1 &&
+
+		git -C pc1 rev-list --quiet --objects --missing=print HEAD >revs &&
+		awk -f print_1.awk revs |
+		sed "s/?//" |
+		sort >observed.oids &&
+
+		test_cmp expect_1.oids observed.oids &&
+		test "$(git -C pc1 config --local core.repositoryformatversion)" = "1" &&
+		test "$(git -C pc1 config --local remote.origin.promisor)" = "true" &&
+		test "$(git -C pc1 config --local remote.origin.partialclonefilter)" = "blob:none"
+	done
+'
 
-	test_cmp expect_1.oids observed.oids &&
-	test "$(git -C pc1 config --local core.repositoryformatversion)" = "1" &&
-	test "$(git -C pc1 config --local remote.origin.promisor)" = "true" &&
-	test "$(git -C pc1 config --local remote.origin.partialclonefilter)" = "blob:none"
+test_expect_success 'do partial clone with size limit' '
+	for option in "--filter=blob:limit=1" "--partial=1"
+	do
+		rm -rf pc-limit &&
+		git clone --no-checkout "$option" "file://$(pwd)/srv.bare" pc-limit &&
+
+		git -C pc-limit rev-list --quiet --objects --missing=print HEAD >revs &&
+		awk -f print_1.awk revs |
+		sed "s/?//" |
+		sort >observed.oids &&
+
+		test_cmp expect_1.oids observed.oids &&
+		test "$(git -C pc-limit config --local core.repositoryformatversion)" = "1" &&
+		test "$(git -C pc-limit config --local remote.origin.promisor)" = "true" &&
+		test "$(git -C pc-limit config --local remote.origin.partialclonefilter)" = "blob:limit=1"
+	done
 '
 
 test_expect_success 'verify that .promisor file contains refs fetched' '

-- 
gitgitgadget
Previous: Derrick Stolee via GitGitGadgetNext: Junio C Hamano
Message 2 of 15 in “Slightly simplify partial clone user experience”
  1. 0/2 Slightly simplify partial clone user experienceDerrick Stolee via GitGitGadget, Mar 19, 2020
  2. 1/2 partial-clone: set default filter with --partialDerrick Stolee via GitGitGadget, Mar 19, 2020
  3. Junio C HamanoMar 20, 2020
  4. Derrick StoleeMar 20, 2020
  5. Jeff KingMar 22, 2020
  6. 2/2 clone: document --partial and --filter optionsDerrick Stolee via GitGitGadget, Mar 19, 2020
  7. Derrick StoleeMar 20, 2020
  8. Jeff KingMar 22, 2020
  9. Christian CouderMar 22, 2020
  10. Derrick StoleeMar 22, 2020
  11. Jeff KingMar 22, 2020
  12. Taylor BlauMar 22, 2020
  13. clone: document --filter optionsDerrick Stolee via GitGitGadget, Mar 22, 2020
  14. Jeff KingMar 24, 2020
  15. Jonathan NiederMar 24, 2020

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