Git remote support fixes: shard git blobstore writes and normalize clone/remote URLs

[coffeegoddd]

Fix git-remote workflows by defaulting git-blobstore sharding to 50MB and correcting clone dir inference, SSH remote parsing, and empty-remote validation (with tests).

[Copilot]

Pull request overview

This PR fixes several git-remote workflows by improving git-backed storage defaults, normalizing git remote URLs at add-time, correcting clone directory inference, and adding validation for empty git remotes (with updated/new tests).

Changes:

• Default git blobstore writes to use chunked objects with a 50MiB max part size when not explicitly configured.
• Normalize git remote URLs when storing them (e.g., scp-style SSH → git+ssh://...) and validate that git remotes have at least one branch.
• Fix clone directory inference to strip .git suffix and expand test coverage + integration test setup.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
integration-tests/bats/remotes-git.bats	Adds a helper to seed an initial branch on bare git remotes so git-remote integration tests can push reliably.
go/store/nbs/store.go	Applies a default MaxPartSize (50MiB) for git-backed stores to enable chunked writes by default.
go/store/nbs/git_blobstore_empty_remote_test.go	Adds a test asserting NewGitStore enables chunked writes by default.
go/libraries/doltcore/dbfactory/git_remote.go	Adds ErrGitRemoteHasNoBranches and blocks CreateDB for git remotes with no remote branches.
go/libraries/doltcore/dbfactory/git_remote_test.go	Seeds a main branch for existing tests and adds a new test for the “no branches” failure.
go/cmd/dolt/commands/remote.go	Stores normalized git+* URLs for git remotes when adding via SQL path.
go/cmd/dolt/commands/remote_test.go	Adds a unit test for storing normalized git URLs.
go/cmd/dolt/commands/clone.go	Strips .git from inferred clone directory names.
go/cmd/dolt/commands/clone_test.go	Updates expected inferred dir and adds coverage for git+file://... URL inference.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[coffeegoddd]

@coffeegoddd DOLT

read_tests	from_latency	to_latency	percent_change
covering_index_scan	0.58	0.55	-5.17
groupby_scan	9.91	9.91	0.0
index_join	1.82	1.82	0.0
index_join_scan	1.32	1.34	1.52
index_scan	21.89	22.28	1.78
oltp_point_select	0.27	0.27	0.0
oltp_read_only	5.28	5.37	1.7
select_random_points	0.53	0.54	1.89
select_random_ranges	0.55	0.55	0.0
table_scan	21.89	22.69	3.65
types_table_scan	66.84	66.84	0.0

write_tests	from_latency	to_latency	percent_change
oltp_delete_insert	6.32	6.32	0.0
oltp_insert	3.07	3.07	0.0
oltp_read_write	11.45	11.45	0.0
oltp_update_index	3.19	3.19	0.0
oltp_update_non_index	3.13	3.13	0.0
oltp_write_only	6.09	6.09	0.0
types_delete_insert	6.79	6.79	0.0

[reltuk]

Extract the constant for 50*1024*1024 like copilot says if you want

[coffeegoddd]

@coffeegoddd DOLT

read_tests	from_latency	to_latency	percent_change
covering_index_scan	0.58	0.55	-5.17
groupby_scan	10.65	10.65	0.0
index_join	1.93	1.89	-2.07
index_join_scan	1.34	1.34	0.0
index_scan	22.28	22.28	0.0
oltp_point_select	0.27	0.27	0.0
oltp_read_only	5.28	5.28	0.0
select_random_points	0.54	0.54	0.0
select_random_ranges	0.55	0.55	0.0
table_scan	22.28	22.28	0.0
types_table_scan	66.84	68.05	1.81

write_tests	from_latency	to_latency	percent_change
oltp_delete_insert	6.32	6.32	0.0
oltp_insert	3.07	3.07	0.0
oltp_read_write	11.45	11.45	0.0
oltp_update_index	3.19	3.19	0.0
oltp_update_non_index	3.13	3.13	0.0
oltp_write_only	6.09	6.09	0.0
types_delete_insert	6.79	6.79	0.0

[coffeegoddd]

@coffeegoddd DOLT

test_name	from_latency_p95	to_latency_p95	percent_change
tpcc-scale-factor-1	61.08	61.08	0.0

test_name	from_server_name	from_server_version	from_tps	to_server_name	to_server_version	to_tps	percent_change
tpcc-scale-factor-1	dolt	da07d80	37.91	dolt	f19ddbf	37.77	-0.37

[coffeegoddd]

@coffeegoddd DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
c494873	ok	5937471

version	total_tests
c494873	5937471

correctness_percentage
100.0

[coffeegoddd]

@coffeegoddd DOLT

test_name	from_latency_p95	to_latency_p95	percent_change
tpcc-scale-factor-1	62.19	62.19	0.0

test_name	from_server_name	from_server_version	from_tps	to_server_name	to_server_version	to_tps	percent_change
tpcc-scale-factor-1	dolt	da07d80	37.41	dolt	c494873	37.34	-0.19

[coffeegoddd]

@coffeegoddd DOLT

read_tests	from_latency	to_latency	percent_change
covering_index_scan	0.57	0.55	-3.51
groupby_scan	9.73	9.91	1.85
index_join	1.79	1.82	1.68
index_join_scan	1.34	1.34	0.0
index_scan	21.89	21.89	0.0
oltp_point_select	0.27	0.27	0.0
oltp_read_only	5.28	5.28	0.0
select_random_points	0.54	0.54	0.0
select_random_ranges	0.55	0.55	0.0
table_scan	21.89	22.28	1.78
types_table_scan	65.65	66.84	1.81

write_tests	from_latency	to_latency	percent_change
oltp_delete_insert	6.32	6.32	0.0
oltp_insert	3.07	3.07	0.0
oltp_read_write	11.45	11.45	0.0
oltp_update_index	3.19	3.19	0.0
oltp_update_non_index	3.13	3.13	0.0
oltp_write_only	6.09	6.09	0.0
types_delete_insert	6.91	6.79	-1.74

[coffeegoddd]

@coffeegoddd DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
50f92c7	ok	5937471

version	total_tests
50f92c7	5937471

correctness_percentage
100.0

[coffeegoddd]

@coffeegoddd DOLT

test_name	from_latency_p95	to_latency_p95	percent_change
tpcc-scale-factor-1	62.19	62.19	0.0

test_name	from_server_name	from_server_version	from_tps	to_server_name	to_server_version	to_tps	percent_change
tpcc-scale-factor-1	dolt	da07d80	37.16	dolt	50f92c7	37.22	0.16