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

go/cmd/dolt/commands/clone.go

@@ -222,6 +222,12 @@ func parseArgs(apr *argparser.ArgParseResults) (string, string, errhand.VerboseE
 		} else if dir == "/" {
 			return "", "", errhand.BuildDError("Could not infer repo name.  Please explicitly define a directory for this url").Build()
 		}
+		if strings.HasSuffix(dir, ".git") {
+			dir = strings.TrimSuffix(dir, ".git")
+			if dir == "" {
+				return "", "", errhand.BuildDError("Could not infer repo name.  Please explicitly define a directory for this url").Build()
+			}
+		}
 	}
 
 	return dir, urlStr, nil

go/cmd/dolt/commands/clone_test.go

@@ -73,6 +73,17 @@ func TestCloneParseArgs_InferDir(t *testing.T) {
 
 	dir, urlStr, verr := parseArgs(apr)
 	require.Nil(t, verr)
-	require.Equal(t, "repo.git", dir)
+	require.Equal(t, "repo", dir)
 	require.Equal(t, "https://example.com/org/repo.git", urlStr)
 }
+
+func TestCloneParseArgs_InferDir_GitFile(t *testing.T) {
+	ap := CloneCmd{}.ArgParser()
+	apr, err := ap.Parse([]string{"git+file:///tmp/remote.git"})
+	require.NoError(t, err)
+
+	dir, urlStr, verr := parseArgs(apr)
+	require.Nil(t, verr)
+	require.Equal(t, "remote", dir)
+	require.Equal(t, "git+file:///tmp/remote.git", urlStr)
+}

go/cmd/dolt/commands/remote.go

@@ -168,7 +168,13 @@ func addRemote(sqlCtx *sql.Context, queryist cli.Queryist, dEnv *env.DoltEnv, ap
 	}
 
 	if len(params) == 0 {
-		err := callSQLRemoteAdd(sqlCtx, queryist, remoteName, remoteUrl)
+		// For git remotes, ensure the stored URL is the normalized git+* dbfactory URL (e.g. scp-style ssh becomes
+		// git+ssh://..., and local paths become git+file://...).
+		urlToStore := remoteUrl
+		if strings.HasPrefix(strings.ToLower(scheme), "git+") {
+			urlToStore = absRemoteUrl
+		}
+		err := callSQLRemoteAdd(sqlCtx, queryist, remoteName, urlToStore)
 		if err != nil {
 			return errhand.BuildDError("error: Unable to add remote.").AddCause(err).Build()
 		}

go/cmd/dolt/commands/remote_test.go

@@ -17,6 +17,7 @@ package commands
 import (
 	"fmt"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -146,3 +147,20 @@ func TestParseRemoteArgs_GitRef(t *testing.T) {
 	assert.Nil(t, verr)
 	assert.Equal(t, "refs/dolt/custom", params[dbfactory.GitRefParam])
 }
+
+func TestRemoteAdd_StoresNormalizedGitUrl(t *testing.T) {
+	// This mirrors the behavior in addRemote(): for git remotes, we must store the normalized git+* URL
+	// (in particular, scp-style ssh should never be stored as a schemeless string).
+	scheme := dbfactory.GitSSHScheme
+	original := "git@github.com:timsehn/dolt-in-git.git"
+	normalized, ok, err := env.NormalizeGitRemoteUrl(original)
+	assert.NoError(t, err)
+	assert.True(t, ok)
+	assert.Equal(t, "git+ssh://git@github.com/timsehn/dolt-in-git.git", normalized)
+
+	urlToStore := original
+	if strings.HasPrefix(strings.ToLower(scheme), "git+") {
+		urlToStore = normalized
+	}
+	assert.Equal(t, normalized, urlToStore)
+}

go/libraries/doltcore/dbfactory/git_remote.go

@@ -44,6 +44,8 @@ const (
 	defaultGitRemoteName = "origin"
 )
 
+var ErrGitRemoteHasNoBranches = errors.New("git remote has no branches")
+
 // GitCacheRootProvider provides the local Dolt repo root for per-repo git remote caches.
 // Implementations should return ok=false when no repo root is available.
 type GitCacheRootProvider interface {
@@ -116,6 +118,9 @@ func (fact GitRemoteFactory) CreateDB(ctx context.Context, nbf *types.NomsBinFor
 	if err := ensureGitRemoteURL(ctx, cacheRepo, remoteName, remoteURL.String()); err != nil {
 		return nil, nil, nil, err
 	}
+	if err := ensureRemoteHasBranches(ctx, cacheRepo, remoteName, remoteURL.String()); err != nil {
+		return nil, nil, nil, err
+	}
 
 	q := nbs.NewUnlimitedMemQuotaProvider()
 	cs, err := nbs.NewGitStore(ctx, nbf.VersionString(), cacheRepo, ref, blobstore.GitBlobstoreOptions{RemoteName: remoteName}, defaultMemTableSize, q)
@@ -129,6 +134,17 @@ func (fact GitRemoteFactory) CreateDB(ctx context.Context, nbf *types.NomsBinFor
 	return db, vrw, ns, nil
 }
 
+func ensureRemoteHasBranches(ctx context.Context, gitDir string, remoteName string, remoteURL string) error {
+	out, err := runGitInDir(ctx, gitDir, "ls-remote", "--heads", "--", remoteName)
+	if err != nil {
+		return err
+	}
+	if strings.TrimSpace(out) == "" {
+		return fmt.Errorf("%w: cannot push to %q; initialize the repository with an initial branch/commit first", ErrGitRemoteHasNoBranches, remoteURL)
+	}
+	return nil
+}
+
 func parseGitRemoteFactoryURL(urlObj *url.URL, params map[string]interface{}) (remoteURL *url.URL, ref string, err error) {
 	if urlObj == nil {
 		return nil, "", fmt.Errorf("nil url")

go/libraries/doltcore/dbfactory/git_remote_test.go

@@ -64,6 +64,8 @@ func TestGitRemoteFactory_GitFile_CachesUnderRepoDoltDirAndCanWrite(t *testing.T
 	ctx := context.Background()
 	remoteRepo, err := gitrepo.InitBare(ctx, filepath.Join(shortTempDir(t), "remote.git"))
 	require.NoError(t, err)
+	_, err = remoteRepo.SetRefToTree(ctx, "refs/heads/main", map[string][]byte{"README": []byte("seed\n")}, "seed")
+	require.NoError(t, err)
 
 	localRepoRoot := shortTempDir(t)
 
@@ -121,6 +123,8 @@ func TestGitRemoteFactory_TwoClientsDistinctCacheDirsRoundtrip(t *testing.T) {
 	ctx := context.Background()
 	remoteRepo, err := gitrepo.InitBare(ctx, filepath.Join(shortTempDir(t), "remote.git"))
 	require.NoError(t, err)
+	_, err = remoteRepo.SetRefToTree(ctx, "refs/heads/main", map[string][]byte{"README": []byte("seed\n")}, "seed")
+	require.NoError(t, err)
 
 	remotePath := filepath.ToSlash(remoteRepo.GitDir)
 	urlStr := "git+file://" + remotePath
@@ -185,3 +189,24 @@ func TestGitRemoteFactory_TwoClientsDistinctCacheDirsRoundtrip(t *testing.T) {
 	require.Equal(t, "clientB\n", string(gotB.Data()))
 	require.NoError(t, dbA2.Close())
 }
+
+func TestGitRemoteFactory_GitFile_RemoteWithNoBranchesFails(t *testing.T) {
+	if _, err := exec.LookPath("git"); err != nil {
+		t.Skip("git not found on PATH")
+	}
+
+	ctx := context.Background()
+	remoteRepo, err := gitrepo.InitBare(ctx, filepath.Join(shortTempDir(t), "remote.git"))
+	require.NoError(t, err)
+
+	localRepoRoot := shortTempDir(t)
+	remotePath := filepath.ToSlash(remoteRepo.GitDir)
+	urlStr := "git+file://" + remotePath
+	params := map[string]interface{}{
+		GitCacheRootParam: localRepoRoot,
+	}
+
+	_, _, _, err = CreateDB(ctx, types.Format_Default, urlStr, params)
+	require.Error(t, err)
+	require.ErrorIs(t, err, ErrGitRemoteHasNoBranches)
+}

go/store/nbs/git_blobstore_empty_remote_test.go

@@ -112,3 +112,55 @@ func TestNBS_GitBlobstore_EmptyRemote_FirstManifestUpdateBootstrapsRef(t *testin
 	require.NoError(t, writeManifest(&buf, contents))
 	require.NotEmpty(t, buf.Bytes())
 }
+
+func TestNBS_NewGitStore_DefaultsMaxPartSizeTo50MB(t *testing.T) {
+	if _, err := exec.LookPath("git"); err != nil {
+		t.Skip("git not found on PATH")
+	}
+
+	ctx := context.Background()
+	remoteRepo, err := gitrepo.InitBare(ctx, t.TempDir()+"/remote.git")
+	require.NoError(t, err)
+	_, err = remoteRepo.SetRefToTree(ctx, blobstore.DoltDataRef, nil, "seed empty")
+	require.NoError(t, err)
+
+	localRepo, err := gitrepo.InitBare(ctx, t.TempDir()+"/local.git")
+	require.NoError(t, err)
+	cmd := exec.CommandContext(ctx, "git", "--git-dir", localRepo.GitDir, "remote", "add", "origin", remoteRepo.GitDir)
+	out, err := cmd.CombinedOutput()
+	require.NoError(t, err, "git remote add failed: %s", string(out))
+
+	store, err := NewGitStore(ctx, types.Format_DOLT.VersionString(), localRepo.GitDir, blobstore.DoltDataRef, blobstore.GitBlobstoreOptions{}, 0, NewUnlimitedMemQuotaProvider())
+	require.NoError(t, err)
+	defer store.Close()
+
+	// Assert the underlying blobstore is a GitBlobstore and that chunked writes are enabled by default.
+	bsp, ok := store.persister.(*blobstorePersister)
+	require.True(t, ok, "expected persister to be *blobstorePersister, got %T", store.persister)
+
+	gbs, ok := bsp.bs.(*blobstore.GitBlobstore)
+	require.True(t, ok, "expected blobstore to be *blobstore.GitBlobstore, got %T", bsp.bs)
+
+	// Use a totalSize larger than the default 50MB threshold, but provide a tiny reader.
+	// planPutWrites decides chunked-vs-inline based on totalSize, and should pick chunked mode
+	// when the default max part size is enabled.
+	_, err = gbs.Put(ctx, "k", int64(50*1024*1024+1), bytes.NewReader([]byte("hi")))
+	require.NoError(t, err)
+
+	// On the remote, key "k" should be represented as a tree containing part "0001".
+	cmd = exec.CommandContext(ctx, "git", "--git-dir", remoteRepo.GitDir, "rev-parse", "--verify", "--quiet", blobstore.DoltDataRef+"^{commit}")
+	headBytes, err := cmd.CombinedOutput()
+	require.NoError(t, err, "git rev-parse failed: %s", string(headBytes))
+
+	commit := string(bytes.TrimSpace(headBytes))
+	cmd = exec.CommandContext(ctx, "git", "--git-dir", remoteRepo.GitDir, "ls-tree", commit, "k")
+	lsOut, err := cmd.CombinedOutput()
+	require.NoError(t, err, "git ls-tree failed: %s", string(lsOut))
+	require.Contains(t, string(lsOut), "\tk\n")
+	require.Contains(t, string(lsOut), "tree")
+
+	cmd = exec.CommandContext(ctx, "git", "--git-dir", remoteRepo.GitDir, "ls-tree", commit, "k/0001")
+	partOut, err := cmd.CombinedOutput()
+	require.NoError(t, err, "git ls-tree part failed: %s", string(partOut))
+	require.Contains(t, string(partOut), "0001")
+}

go/store/nbs/store.go

@@ -70,6 +70,10 @@ const (
 	defaultMaxTables           = 256
 
 	defaultManifestCacheSize = 1 << 23 // 8MB
+
+	// defaultGitBlobstoreMaxPartSize is the default maximum size (in bytes) for a single part blob written to a
+	// git-backed blobstore. Large values may be rejected by some Git remotes.
+	defaultGitBlobstoreMaxPartSize uint64 = 50 * 1024 * 1024
 )
 
 var (
@@ -628,6 +632,12 @@ func NewOCISStore(ctx context.Context, nbfVerStr string, bucketName, path string
 func NewGitStore(ctx context.Context, nbfVerStr string, gitDir string, ref string, opts blobstore.GitBlobstoreOptions, memTableSize uint64, q MemoryQuotaProvider) (*NomsBlockStore, error) {
 	cacheOnce.Do(makeGlobalCaches)
 
+	// A Git remote may reject large blobs. To keep git-backed remotes broadly usable by default, enable
+	// chunked-object writes with a conservative max part size unless the caller explicitly overrides it.
+	if opts.MaxPartSize == 0 {
+		opts.MaxPartSize = defaultGitBlobstoreMaxPartSize
+	}
+
 	bs, err := blobstore.NewGitBlobstoreWithOptions(gitDir, ref, opts)
 	if err != nil {
 		return nil, err
@@ -640,6 +650,10 @@ func NewGitStore(ctx context.Context, nbfVerStr string, gitDir string, ref strin
 func NewNoConjoinGitStore(ctx context.Context, nbfVerStr string, gitDir string, ref string, opts blobstore.GitBlobstoreOptions, memTableSize uint64, q MemoryQuotaProvider) (*NomsBlockStore, error) {
 	cacheOnce.Do(makeGlobalCaches)
 
+	if opts.MaxPartSize == 0 {
+		opts.MaxPartSize = defaultGitBlobstoreMaxPartSize
+	}
+
 	bs, err := blobstore.NewGitBlobstoreWithOptions(gitDir, ref, opts)
 	if err != nil {
 		return nil, err

integration-tests/bats/remotes-git.bats

@@ -18,9 +18,39 @@ teardown() {
     teardown_common
 }
 
+seed_git_remote_branch() {
+    # Create an initial branch on an otherwise-empty bare git remote.
+    # Dolt git remotes require at least one git branch to exist on the remote.
+    local remote_git_dir="$1"
+    local branch="${2:-main}"
+
+    local remote_abs
+    remote_abs="$(cd "$remote_git_dir" && pwd)"
+
+    local seed_dir
+    seed_dir="$(mktemp -d "${BATS_TMPDIR:-/tmp}/seed-repo.XXXXXX")"
+
+    (
+        set -euo pipefail
+        trap 'rm -rf "$seed_dir"' EXIT
+        cd "$seed_dir"
+
+        git init >/dev/null
+        git config user.email "bats@email.fake"
+        git config user.name "Bats Tests"
+        echo "seed" > README
+        git add README
+        git commit -m "seed" >/dev/null
+        git branch -M "$branch"
+        git remote add origin "$remote_abs"
+        git push origin "$branch" >/dev/null
+    )
+}
+
 @test "remotes-git: smoke push/clone/push-back/pull" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1
@@ -58,6 +88,7 @@ teardown() {
 @test "remotes-git: empty remote bootstrap creates refs/dolt/data" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     # Assert the dolt data ref doesn't exist yet.
     run git --git-dir remote.git show-ref refs/dolt/data
@@ -82,6 +113,7 @@ teardown() {
 @test "remotes-git: pull also fetches branches from git remote" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1
@@ -115,6 +147,7 @@ teardown() {
 @test "remotes-git: pull fetches but does not merge other branches" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1
@@ -156,6 +189,7 @@ teardown() {
 @test "remotes-git: custom --ref writes to configured dolt data ref" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1
@@ -192,6 +226,7 @@ teardown() {
 @test "remotes-git: push works with per-repo git cache under .dolt/" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1

integration-tests/bats/sql-remotes-git.bats

@@ -17,9 +17,39 @@ teardown() {
     teardown_common
 }
 
+seed_git_remote_branch() {
+    # Create an initial branch on an otherwise-empty bare git remote.
+    # Dolt git remotes require at least one git branch to exist on the remote.
+    local remote_git_dir="$1"
+    local branch="${2:-main}"
+
+    local remote_abs
+    remote_abs="$(cd "$remote_git_dir" && pwd)"
+
+    local seed_dir
+    seed_dir="$(mktemp -d "${BATS_TMPDIR:-/tmp}/seed-repo.XXXXXX")"
+
+    (
+        set -euo pipefail
+        trap 'rm -rf "$seed_dir"' EXIT
+        cd "$seed_dir"
+
+        git init >/dev/null
+        git config user.email "bats@email.fake"
+        git config user.name "Bats Tests"
+        echo "seed" > README
+        git add README
+        git commit -m "seed" >/dev/null
+        git branch -M "$branch"
+        git remote add origin "$remote_abs"
+        git push origin "$branch" >/dev/null
+    )
+}
+
 @test "sql-remotes-git: dolt_remote add supports --ref for git remotes" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1
@@ -44,6 +74,7 @@ SQL
 @test "sql-remotes-git: dolt_clone supports --ref for git remotes" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1
@@ -78,6 +109,7 @@ SQL
 @test "sql-remotes-git: dolt_backup sync-url supports --ref for git remotes" {
     mkdir remote.git
     git init --bare remote.git
+    seed_git_remote_branch remote.git main
 
     mkdir repo1
     cd repo1