Implement positive values for <depth> in the tree:<depth> filter. The
exact semantics are described in Documentation/rev-list-options.txt.
The long-term goal at the end of this is to allow a partial clone to
eagerly fetch an entire directory of files by fetching a tree and
specifying <depth>=1. This, for instance, would make a build operation
fast and convenient. It is fast because the partial clone does not need
to fetch each file individually, and convenient because the user does
not need to supply a sparse-checkout specification.
Another way of considering this feature is as a way to reduce
round-trips, since the client can get any number of levels of
directories in a single request, rather than wait for each level of tree
objects to come back, whose entries are used to construct a new request.
Signed-off-by: Matthew DeVore <matvore@xxxxxxxxxx>
---
Documentation/rev-list-options.txt | 9 ++-
list-objects-filter-options.c | 7 +-
list-objects-filter-options.h | 3 +-
list-objects-filter.c | 115 +++++++++++++++++++++++-----
t/t6112-rev-list-filters-objects.sh | 104 +++++++++++++++++++++++++
5 files changed, 210 insertions(+), 28 deletions(-)
diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index bab5f50b17..f8ab00f7c9 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -734,8 +734,13 @@ specification contained in <path>.
+
The form '--filter=tree:<depth>' omits all blobs and trees whose depth
from the root tree is >= <depth> (minimum depth if an object is located
-at multiple depths in the commits traversed). Currently, only <depth>=0
-is supported, which omits all blobs and trees.
+at multiple depths in the commits traversed). <depth>=0 will not include
+any trees or blobs unless included explicitly in the command-line (or
+standard input when --stdin is used). <depth>=1 will include only the
+tree and blobs which are referenced directly by a commit reachable from
+<commit> or an explicitly-given object. <depth>=2 is like <depth>=1
+while also including trees and blobs one more level removed from an
+explicitly-given commit or tree.
--no-filter::
Turn off any previous `--filter=` argument.
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index e8da2e8581..5285e7674d 100644
--- a/list-objects-filter-options.c
+++ b/list-objects-filter-options.c
@@ -50,16 +50,15 @@ static int gently_parse_list_objects_filter(
}
} else if (skip_prefix(arg, "tree:", &v0)) {
- unsigned long depth;
- if (!git_parse_ulong(v0, &depth) || depth != 0) {
+ if (!git_parse_ulong(v0, &filter_options->tree_exclude_depth)) {
if (errbuf) {
strbuf_addstr(
errbuf,
- _("only 'tree:0' is supported"));
+ _("expected 'tree:<depth>'"));
}
return 1;
}
- filter_options->choice = LOFC_TREE_NONE;
+ filter_options->choice = LOFC_TREE_DEPTH;
return 0;
} else if (skip_prefix(arg, "sparse:oid=", &v0)) {
diff --git a/list-objects-filter-options.h b/list-objects-filter-options.h
index af64e5c66f..477cd97029 100644
--- a/list-objects-filter-options.h
+++ b/list-objects-filter-options.h
@@ -10,7 +10,7 @@ enum list_objects_filter_choice {
LOFC_DISABLED = 0,
LOFC_BLOB_NONE,
LOFC_BLOB_LIMIT,
- LOFC_TREE_NONE,
+ LOFC_TREE_DEPTH,
LOFC_SPARSE_OID,
LOFC_SPARSE_PATH,
LOFC__COUNT /* must be last */
@@ -44,6 +44,7 @@ struct list_objects_filter_options {
struct object_id *sparse_oid_value;
char *sparse_path_value;
unsigned long blob_limit_value;
+ unsigned long tree_exclude_depth;
};
/* Normalized command line arguments */
diff --git a/list-objects-filter.c b/list-objects-filter.c
index a62624a1ce..ca99f0dd02 100644
--- a/list-objects-filter.c
+++ b/list-objects-filter.c
@@ -10,6 +10,7 @@
#include "list-objects.h"
#include "list-objects-filter.h"
#include "list-objects-filter-options.h"
+#include "oidmap.h"
#include "oidset.h"
#include "object-store.h"
@@ -84,11 +85,43 @@ static void *filter_blobs_none__init(
* A filter for list-objects to omit ALL trees and blobs from the traversal.
* Can OPTIONALLY collect a list of the omitted OIDs.
*/
-struct filter_trees_none_data {
+struct filter_trees_depth_data {
struct oidset *omits;
+
+ /*
+ * Maps trees to the minimum depth at which they were seen. It is not
+ * necessary to re-traverse a tree at deeper or equal depths than it has
+ * already been traversed.
+ *
+ * We can't use LOFR_MARK_SEEN for tree objects since this will prevent
+ * it from being traversed at shallower depths.
+ */
+ struct oidmap seen_at_depth;
+
+ unsigned long exclude_depth;
+ unsigned long current_depth;
};
-static enum list_objects_filter_result filter_trees_none(
+struct seen_map_entry {
+ struct oidmap_entry base;
+ size_t depth;
+};
+
+static void filter_trees_update_omits(
+ struct object *obj,
+ struct filter_trees_depth_data *filter_data,
+ int include_it)
+{
+ if (!filter_data->omits)
+ return;
+
+ if (include_it)
+ oidset_remove(filter_data->omits, &obj->oid);
+ else
+ oidset_insert(filter_data->omits, &obj->oid);
+}
+
+static enum list_objects_filter_result filter_trees_depth(
struct repository *r,
enum list_objects_filter_situation filter_situation,
struct object *obj,
@@ -96,43 +129,83 @@ static enum list_objects_filter_result filter_trees_none(
const char *filename,
void *filter_data_)
{
- struct filter_trees_none_data *filter_data = filter_data_;
+ struct filter_trees_depth_data *filter_data = filter_data_;
+ struct seen_map_entry *seen_info;
+ int include_it = filter_data->current_depth <
+ filter_data->exclude_depth;
+ int filter_res;
+ int already_seen;
+
+ /*
+ * Note that we do not use _MARK_SEEN in order to allow re-traversal in
+ * case we encounter a tree or blob again at a shallower depth.
+ */
switch (filter_situation) {
default:
BUG("unknown filter_situation: %d", filter_situation);
- case LOFS_BEGIN_TREE:
- case LOFS_BLOB:
- if (filter_data->omits) {
- oidset_insert(filter_data->omits, &obj->oid);
- /* _MARK_SEEN but not _DO_SHOW (hard omit) */
- return LOFR_MARK_SEEN;
- } else {
- /*
- * Not collecting omits so no need to to traverse tree.
- */
- return LOFR_SKIP_TREE | LOFR_MARK_SEEN;
- }
-
case LOFS_END_TREE:
assert(obj->type == OBJ_TREE);
+ filter_data->current_depth--;
return LOFR_ZERO;
+ case LOFS_BLOB:
+ filter_trees_update_omits(obj, filter_data, include_it);
+ return include_it ? LOFR_MARK_SEEN | LOFR_DO_SHOW : LOFR_ZERO;
+
+ case LOFS_BEGIN_TREE:
+ seen_info = oidmap_get(
+ &filter_data->seen_at_depth, &obj->oid);
+ if (!seen_info) {
+ seen_info = xcalloc(1, sizeof(struct seen_map_entry));
+ seen_info->base.oid = obj->oid;
+ seen_info->depth = filter_data->current_depth;
+ oidmap_put(&filter_data->seen_at_depth, seen_info);
+ already_seen = 0;
+ } else
+ already_seen =
+ filter_data->current_depth >= seen_info->depth;
+
+ if (already_seen)
+ filter_res = LOFR_SKIP_TREE;
+ else {
+ seen_info->depth = filter_data->current_depth;
+ filter_trees_update_omits(obj, filter_data, include_it);
+
+ if (include_it)
+ filter_res = LOFR_DO_SHOW;
+ else if (filter_data->omits)
+ filter_res = LOFR_ZERO;
+ else
+ filter_res = LOFR_SKIP_TREE;
+ }
+
+ filter_data->current_depth++;
+ return filter_res;
}
}
-static void* filter_trees_none__init(
+static void filter_trees_free(void *filter_data) {
+ struct filter_trees_depth_data* d = filter_data;
+ oidmap_free(&d->seen_at_depth, 1);
+ free(d);
+}
+
+static void* filter_trees_depth__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn)
{
- struct filter_trees_none_data *d = xcalloc(1, sizeof(*d));
+ struct filter_trees_depth_data *d = xcalloc(1, sizeof(*d));
d->omits = omitted;
+ oidmap_init(&d->seen_at_depth, 0);
+ d->exclude_depth = filter_options->tree_exclude_depth;
+ d->current_depth = 0;
- *filter_fn = filter_trees_none;
- *filter_free_fn = free;
+ *filter_fn = filter_trees_depth;
+ *filter_free_fn = filter_trees_free;
return d;
}
@@ -430,7 +503,7 @@ static filter_init_fn s_filters[] = {
NULL,
filter_blobs_none__init,
filter_blobs_limit__init,
- filter_trees_none__init,
+ filter_trees_depth__init,
filter_sparse_oid__init,
filter_sparse_path__init,
};
diff --git a/t/t6112-rev-list-filters-objects.sh b/t/t6112-rev-list-filters-objects.sh
index eb32505a6e..54e7096d40 100755
--- a/t/t6112-rev-list-filters-objects.sh
+++ b/t/t6112-rev-list-filters-objects.sh
@@ -294,6 +294,110 @@ test_expect_success 'filter a GIANT tree through tree:0' '
! grep "Skipping contents of tree [^.]" filter_trace
'
+# Test tree:# filters.
+
+expect_has () {
+ commit=$1 &&
+ name=$2 &&
+
+ hash=$(git -C r3 rev-parse $commit:$name) &&
+ grep "^$hash $name$" actual
+}
+
+test_expect_success 'verify tree:1 includes root trees' '
+ git -C r3 rev-list --objects --filter=tree:1 HEAD >actual &&
+
+ # We should get two root directories and two commits.
+ expect_has HEAD "" &&
+ expect_has HEAD~1 "" &&
+ test_line_count = 4 actual
+'
+
+test_expect_success 'verify tree:2 includes root trees and immediate children' '
+ git -C r3 rev-list --objects --filter=tree:2 HEAD >actual &&
+
+ expect_has HEAD "" &&
+ expect_has HEAD~1 "" &&
+ expect_has HEAD dir1 &&
+ expect_has HEAD pattern &&
+ expect_has HEAD sparse1 &&
+ expect_has HEAD sparse2 &&
+
+ # There are also 2 commit objects
+ test_line_count = 8 actual
+'
+
+test_expect_success 'verify tree:3 includes everything expected' '
+ git -C r3 rev-list --objects --filter=tree:3 HEAD >actual &&
+
+ expect_has HEAD "" &&
+ expect_has HEAD~1 "" &&
+ expect_has HEAD dir1 &&
+ expect_has HEAD dir1/sparse1 &&
+ expect_has HEAD dir1/sparse2 &&
+ expect_has HEAD pattern &&
+ expect_has HEAD sparse1 &&
+ expect_has HEAD sparse2 &&
+
+ # There are also 2 commit objects
+ test_line_count = 10 actual
+'
+
+# Test provisional omit collection logic with a repo that has objects appearing
+# at multiple depths - first deeper than the filter's threshold, then shallow.
+
+test_expect_success 'setup r4' '
+ git init r4 &&
+
+ echo foo > r4/foo &&
+ mkdir r4/subdir &&
+ echo bar > r4/subdir/bar &&
+
+ mkdir r4/filt &&
+ cp -r r4/foo r4/subdir r4/filt &&
+
+ git -C r4 add foo subdir filt &&
+ git -C r4 commit -m "commit msg"
+'
+
+expect_has_with_different_name () {
+ repo=$1 &&
+ name=$2 &&
+
+ hash=$(git -C $repo rev-parse HEAD:$name) &&
+ ! grep "^$hash $name$" actual &&
+ grep "^$hash " actual &&
+ ! grep "~$hash" actual
+}
+
+test_expect_success 'test tree:# filter provisional omit for blob and tree' '
+ git -C r4 rev-list --objects --filter-print-omitted --filter=tree:2 \
+ HEAD >actual &&
+ expect_has_with_different_name r4 filt/foo &&
+ expect_has_with_different_name r4 filt/subdir
+'
+
+# Test tree:<depth> where a tree is iterated to twice - once where a subentry is
+# too deep to be included, and again where the blob inside it is shallow enough
+# to be included. This makes sure we don't use LOFR_MARK_SEEN incorrectly (we
+# can't use it because a tree can be iterated over again at a lower depth).
+
+test_expect_success 'tree:<depth> where we iterate over tree at two levels' '
+ git init r5 &&
+
+ mkdir -p r5/a/subdir/b &&
+ echo foo > r5/a/subdir/b/foo &&
+
+ mkdir -p r5/subdir/b &&
+ echo foo > r5/subdir/b/foo &&
+
+ git -C r5 add a subdir &&
+ git -C r5 commit -m "commit msg" &&
+
+ git -C r5 rev-list --objects --filter=tree:4 HEAD >actual &&
+ expect_has_with_different_name r5 a/subdir/b/foo
+'
+
# Delete some loose objects and use rev-list, but WITHOUT any filtering.
# This models previously omitted objects that we did not receive.
--
2.20.0.rc2.403.gdbc3b29805-goog
