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path: root/commitgraph_read_test.go
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-rw-r--r--commitgraph_read_test.go558
1 files changed, 0 insertions, 558 deletions
diff --git a/commitgraph_read_test.go b/commitgraph_read_test.go
deleted file mode 100644
index 9a8ea49e..00000000
--- a/commitgraph_read_test.go
+++ /dev/null
@@ -1,558 +0,0 @@
-package furgit
-
-import (
- "bytes"
- "encoding/binary"
- "fmt"
- "os"
- "path/filepath"
- "sort"
- "strconv"
- "strings"
- "testing"
-
- "codeberg.org/lindenii/furgit/internal/bloom"
-)
-
-func TestCommitGraphReadBasic(t *testing.T) {
- repoPath, cleanup := setupTestRepo(t)
- defer cleanup()
-
- workDir, cleanupWork := setupWorkDir(t)
- defer cleanupWork()
-
- files := []string{"a.txt", "b.txt", "c.txt"}
- for i, name := range files {
- path := filepath.Join(workDir, name)
- content := fmt.Sprintf("content-%d\n", i)
- if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
- t.Fatalf("write %s: %v", name, err)
- }
- gitCmd(t, repoPath, "--work-tree="+workDir, "add", ".")
- gitCmd(t, repoPath, "--work-tree="+workDir, "commit", "-m", fmt.Sprintf("commit %d", i))
- }
-
- gitCmd(t, repoPath, "repack", "-a", "-d")
- gitCmd(t, repoPath, "commit-graph", "write", "--reachable", "--changed-paths")
-
- repo, err := OpenRepository(repoPath)
- if err != nil {
- t.Fatalf("OpenRepository failed: %v", err)
- }
- defer func() { _ = repo.Close() }()
-
- cg, err := repo.CommitGraph()
- if err != nil {
- t.Fatalf("CommitGraph failed: %v", err)
- }
-
- revList := gitCmd(t, repoPath, "rev-list", "--all")
- commits := strings.Fields(revList)
- if len(commits) == 0 {
- t.Fatal("no commits found")
- }
-
- falsePositives := 0
- for _, oidStr := range commits {
- id, err := repo.ParseHash(oidStr)
- if err != nil {
- t.Fatalf("ParseHash failed: %v", err)
- }
- pos, ok := cg.CommitPosition(id)
- if !ok {
- t.Fatalf("commit %s not found in commit-graph", oidStr)
- }
- cc, err := cg.CommitAt(pos)
- if err != nil {
- t.Fatalf("CommitAt failed: %v", err)
- }
-
- treeStr := string(gitCmd(t, repoPath, "show", "-s", "--format=%T", oidStr))
- tree, err := repo.ParseHash(treeStr)
- if err != nil {
- t.Fatalf("ParseHash tree failed: %v", err)
- }
- if cc.Tree != tree {
- t.Fatalf("tree mismatch for %s: got %s want %s", oidStr, cc.Tree.String(), tree.String())
- }
-
- parentStr := string(gitCmd(t, repoPath, "show", "-s", "--format=%P", oidStr))
- parents := strings.Fields(parentStr)
- if len(parents) != len(cc.Parents) {
- t.Fatalf("parent count mismatch for %s: got %d want %d", oidStr, len(cc.Parents), len(parents))
- }
- for i, p := range parents {
- pid, err := repo.ParseHash(p)
- if err != nil {
- t.Fatalf("ParseHash parent failed: %v", err)
- }
- got, err := cg.OIDAt(cc.Parents[i])
- if err != nil {
- t.Fatalf("OIDAt parent failed: %v", err)
- }
- if got != pid {
- t.Fatalf("parent mismatch for %s: got %s want %s", oidStr, got.String(), pid.String())
- }
- }
-
- ctStr := gitCmd(t, repoPath, "show", "-s", "--format=%ct", oidStr)
- ct, err := strconv.ParseInt(ctStr, 10, 64)
- if err != nil {
- t.Fatalf("parse commit time: %v", err)
- }
- if cc.CommitTime != uint64(ct) {
- t.Fatalf("commit time mismatch for %s: got %d want %d", oidStr, cc.CommitTime, ct)
- }
-
- changed := gitCmd(t, repoPath, "diff-tree", "--no-commit-id", "--name-only", "-r", "--root", oidStr)
- for _, path := range strings.Fields(changed) {
- if path == "" {
- continue
- }
- if !cc.ChangedPathMightContain([]byte(path)) {
- t.Fatalf("bloom filter missing changed path %q in %s", path, oidStr)
- }
- }
- if cc.ChangedPathMightContain([]byte("this-path-should-not-exist-abcdefg")) {
- falsePositives++
- }
- }
- if falsePositives > 1 {
- t.Fatalf("unexpected bloom false positive rate: %d", falsePositives)
- }
-}
-
-func TestCommitGraphReadExtraEdges(t *testing.T) {
- workDir, cleanupWork := setupWorkDir(t)
- defer cleanupWork()
-
- gitCmd(t, workDir, "init")
-
- if err := os.WriteFile(filepath.Join(workDir, "base.txt"), []byte("base\n"), 0o644); err != nil {
- t.Fatalf("write base: %v", err)
- }
- gitCmd(t, workDir, "add", ".")
- gitCmd(t, workDir, "commit", "-m", "base")
-
- gitCmd(t, workDir, "checkout", "-b", "branch1")
- if err := os.WriteFile(filepath.Join(workDir, "b1.txt"), []byte("b1\n"), 0o644); err != nil {
- t.Fatalf("write b1: %v", err)
- }
- gitCmd(t, workDir, "add", ".")
- gitCmd(t, workDir, "commit", "-m", "b1")
-
- gitCmd(t, workDir, "checkout", "master")
- gitCmd(t, workDir, "checkout", "-b", "branch2")
- if err := os.WriteFile(filepath.Join(workDir, "b2.txt"), []byte("b2\n"), 0o644); err != nil {
- t.Fatalf("write b2: %v", err)
- }
- gitCmd(t, workDir, "add", ".")
- gitCmd(t, workDir, "commit", "-m", "b2")
-
- gitCmd(t, workDir, "checkout", "master")
- gitCmd(t, workDir, "checkout", "-b", "branch3")
- if err := os.WriteFile(filepath.Join(workDir, "b3.txt"), []byte("b3\n"), 0o644); err != nil {
- t.Fatalf("write b3: %v", err)
- }
- gitCmd(t, workDir, "add", ".")
- gitCmd(t, workDir, "commit", "-m", "b3")
-
- gitCmd(t, workDir, "checkout", "master")
- gitCmd(t, workDir, "merge", "--no-ff", "-m", "octopus", "branch1", "branch2", "branch3")
-
- gitCmd(t, workDir, "repack", "-a", "-d")
- gitCmd(t, workDir, "commit-graph", "write", "--reachable")
-
- repo, err := OpenRepository(filepath.Join(workDir, ".git"))
- if err != nil {
- t.Fatalf("OpenRepository failed: %v", err)
- }
- defer func() { _ = repo.Close() }()
-
- cg, err := repo.CommitGraph()
- if err != nil {
- t.Fatalf("CommitGraph failed: %v", err)
- }
-
- mergeHash := gitCmd(t, workDir, "rev-parse", "HEAD")
- id, _ := repo.ParseHash(mergeHash)
- pos, ok := cg.CommitPosition(id)
- if !ok {
- t.Fatalf("merge commit not found")
- }
- cc, err := cg.CommitAt(pos)
- if err != nil {
- t.Fatalf("CommitAt failed: %v", err)
- }
- parentStr := gitCmd(t, workDir, "show", "-s", "--format=%P", mergeHash)
- parents := strings.Fields(parentStr)
- if len(cc.Parents) != len(parents) {
- t.Fatalf("octopus parent mismatch: got %d want %d", len(cc.Parents), len(parents))
- }
-}
-
-func TestCommitGraphReadSplitChain(t *testing.T) {
- repoPath, cleanup := setupTestRepo(t)
- defer cleanup()
-
- workDir, cleanupWork := setupWorkDir(t)
- defer cleanupWork()
-
- for i := 0; i < 5; i++ {
- path := filepath.Join(workDir, fmt.Sprintf("file%d.txt", i))
- if err := os.WriteFile(path, []byte(fmt.Sprintf("v%d\n", i)), 0o644); err != nil {
- t.Fatalf("write %s: %v", path, err)
- }
- gitCmd(t, repoPath, "--work-tree="+workDir, "add", ".")
- gitCmd(t, repoPath, "--work-tree="+workDir, "commit", "-m", fmt.Sprintf("commit %d", i))
- }
-
- gitCmd(t, repoPath, "repack", "-a", "-d")
- gitCmd(t, repoPath, "commit-graph", "write", "--reachable", "--changed-paths", "--split=no-merge")
-
- // more commits needed to get a split chain with base layer
- for i := 5; i < 8; i++ {
- path := filepath.Join(workDir, fmt.Sprintf("file%d.txt", i))
- if err := os.WriteFile(path, []byte(fmt.Sprintf("v%d\n", i)), 0o644); err != nil {
- t.Fatalf("write %s: %v", path, err)
- }
- gitCmd(t, repoPath, "--work-tree="+workDir, "add", ".")
- gitCmd(t, repoPath, "--work-tree="+workDir, "commit", "-m", fmt.Sprintf("commit %d", i))
- }
- gitCmd(t, repoPath, "repack", "-a", "-d")
- gitCmd(t, repoPath, "commit-graph", "write", "--reachable", "--changed-paths", "--split=no-merge", "--append")
-
- repo, err := OpenRepository(repoPath)
- if err != nil {
- t.Fatalf("OpenRepository failed: %v", err)
- }
- defer func() { _ = repo.Close() }()
-
- cg, err := repo.CommitGraph()
- if err != nil {
- t.Fatalf("CommitGraph failed: %v", err)
- }
- chainPath := filepath.Join(repoPath, "objects", "info", "commit-graphs", "commit-graph-chain")
- if _, err := os.Stat(chainPath); err != nil {
- t.Fatalf("commit-graph chain not created by git: %v", err)
- }
- if cg.base == nil {
- t.Fatalf("expected split commit-graph chain")
- }
- if cg.numCommitsInBase == 0 {
- t.Fatalf("expected non-zero base commit count")
- }
- revList := gitCmd(t, repoPath, "rev-list", "--max-parents=0", "HEAD")
- id, _ := repo.ParseHash(revList)
- if _, ok := cg.CommitPosition(id); !ok {
- t.Fatalf("base commit not found in commit-graph chain")
- }
-}
-
-func TestCommitGraphTrailerChecksum(t *testing.T) {
- repoPath, cleanup := setupTestRepo(t)
- defer cleanup()
- repo, err := OpenRepository(repoPath)
- if err != nil {
- t.Fatalf("OpenRepository failed: %v", err)
- }
- defer func() { _ = repo.Close() }()
-
- data := buildCommitGraphBytes(t, repo, 1, nil, nil, nil)
- data[len(data)-1] ^= 0xff
- if _, err := parseCommitGraph(repo, "corrupt.graph", data); err == nil {
- t.Fatalf("expected checksum error")
- }
-}
-
-func TestCommitGraphFanoutMonotonicity(t *testing.T) {
- repoPath, cleanup := setupTestRepo(t)
- defer cleanup()
- repo, err := OpenRepository(repoPath)
- if err != nil {
- t.Fatalf("OpenRepository failed: %v", err)
- }
- defer func() { _ = repo.Close() }()
-
- oids := [][]byte{
- bytes.Repeat([]byte{0x10}, repo.hashAlgo.Size()),
- bytes.Repeat([]byte{0x20}, repo.hashAlgo.Size()),
- }
- data := buildCommitGraphBytes(t, repo, 2, oids, nil, nil)
- start, end, ok := chunkRange(t, repo, data, commitGraphChunkOIDF)
- if !ok {
- t.Fatalf("OIDF chunk not found")
- }
- fanout := make([]byte, end-start)
- copy(fanout, data[start:end])
- binary.BigEndian.PutUint32(fanout[0:4], 2)
- binary.BigEndian.PutUint32(fanout[4:8], 1)
- data = replaceChunk(t, repo, data, commitGraphChunkOIDF, fanout)
- if _, err := parseCommitGraph(repo, "bad-fanout.graph", data); err == nil {
- t.Fatalf("expected fanout monotonicity error")
- }
-}
-
-func TestCommitGraphBIDXMonotonicity(t *testing.T) {
- repoPath, cleanup := setupTestRepo(t)
- defer cleanup()
- repo, err := OpenRepository(repoPath)
- if err != nil {
- t.Fatalf("OpenRepository failed: %v", err)
- }
- defer func() { _ = repo.Close() }()
-
- oids := [][]byte{
- bytes.Repeat([]byte{0x10}, repo.hashAlgo.Size()),
- bytes.Repeat([]byte{0x20}, repo.hashAlgo.Size()),
- }
- bidx := []uint32{8, 4}
- data := buildCommitGraphBytes(t, repo, 2, oids, bidx, []byte{0, 0, 0, 0, 0, 0, 0, 0})
- if _, err := parseCommitGraph(repo, "bad-bidx.graph", data); err == nil {
- t.Fatalf("expected bidx monotonicity error")
- }
-}
-
-func TestCommitGraphExtraEdgesBounds(t *testing.T) {
- repoPath, cleanup := setupTestRepo(t)
- defer cleanup()
- repo, err := OpenRepository(repoPath)
- if err != nil {
- t.Fatalf("OpenRepository failed: %v", err)
- }
- defer func() { _ = repo.Close() }()
-
- oids := [][]byte{
- bytes.Repeat([]byte{0x10}, repo.hashAlgo.Size()),
- bytes.Repeat([]byte{0x20}, repo.hashAlgo.Size()),
- bytes.Repeat([]byte{0x30}, repo.hashAlgo.Size()),
- }
- extraEdges := []uint32{0x80000000 | 100}
- data := buildCommitGraphBytes(t, repo, 3, oids, nil, nil)
-
- // inject EDGE chunk with an out-of-range index
- data = injectChunk(t, repo, data, commitGraphChunkEDGE, u32SliceToBytes(extraEdges))
-
- // force the first commit to use the extra edges list
- start, end, ok := chunkRange(t, repo, data, commitGraphChunkCDAT)
- if !ok {
- t.Fatalf("CDAT chunk not found")
- }
- cdat := make([]byte, end-start)
- copy(cdat, data[start:end])
- hashSize := repo.hashAlgo.Size()
- binary.BigEndian.PutUint32(cdat[hashSize+4:hashSize+8], 0x80000000|100)
- data = replaceChunk(t, repo, data, commitGraphChunkCDAT, cdat)
-
- cg, err := parseCommitGraph(repo, "edge.graph", data)
- if err != nil {
- t.Fatalf("parseCommitGraph failed: %v", err)
- }
- pos, ok := cg.CommitPosition(hashFromBytes(repo, oids[0]))
- if !ok {
- t.Fatalf("commit not found")
- }
- if _, err := cg.CommitAt(pos); err == nil {
- t.Fatalf("expected extra-edges bounds error")
- }
-}
-
-func buildCommitGraphBytes(t *testing.T, repo *Repository, n int, oids [][]byte, bidx []uint32, bdat []byte) []byte {
- t.Helper()
- if n <= 0 {
- t.Fatalf("invalid num commits")
- }
- hashSize := repo.hashAlgo.Size()
- if len(oids) == 0 {
- for i := 0; i < n; i++ {
- b := bytes.Repeat([]byte{byte(0x10 + i)}, hashSize)
- oids = append(oids, b)
- }
- }
- sort.Slice(oids, func(i, j int) bool {
- return bytes.Compare(oids[i], oids[j]) < 0
- })
-
- var chunks []chunkSpec
- oidf := make([]byte, commitGraphFanoutSize)
- for _, oid := range oids {
- idx := int(oid[0])
- for i := idx; i < 256; i++ {
- v := binary.BigEndian.Uint32(oidf[i*4 : i*4+4])
- binary.BigEndian.PutUint32(oidf[i*4:i*4+4], v+1)
- }
- }
- chunks = append(chunks, chunkSpec{commitGraphChunkOIDF, oidf})
-
- oidl := make([]byte, 0, n*hashSize)
- for _, oid := range oids {
- oidl = append(oidl, oid...)
- }
- chunks = append(chunks, chunkSpec{commitGraphChunkOIDL, oidl})
-
- cdat := make([]byte, n*commitGraphCommitDataSize(repo.hashAlgo))
- for i := 0; i < n; i++ {
- base := i * commitGraphCommitDataSize(repo.hashAlgo)
- copy(cdat[base:base+hashSize], bytes.Repeat([]byte{0xaa}, hashSize))
- binary.BigEndian.PutUint32(cdat[base+hashSize:], commitGraphParentNone)
- binary.BigEndian.PutUint32(cdat[base+hashSize+4:], commitGraphParentNone)
- binary.BigEndian.PutUint32(cdat[base+hashSize+8:], 4)
- binary.BigEndian.PutUint32(cdat[base+hashSize+12:], 0)
- }
- chunks = append(chunks, chunkSpec{commitGraphChunkCDAT, cdat})
-
- if bidx != nil && bdat != nil {
- bidxBytes := u32SliceToBytes(bidx)
- bdatHeader := make([]byte, bloom.DataHeaderSize)
- binary.BigEndian.PutUint32(bdatHeader[0:4], 2)
- binary.BigEndian.PutUint32(bdatHeader[4:8], 7)
- binary.BigEndian.PutUint32(bdatHeader[8:12], 10)
- bdatFull := append(bdatHeader, bdat...)
- chunks = append(chunks, chunkSpec{commitGraphChunkBIDX, bidxBytes})
- chunks = append(chunks, chunkSpec{commitGraphChunkBDAT, bdatFull})
- }
-
- return assembleCommitGraphBytes(t, repo, chunks)
-}
-
-type chunkSpec struct {
- id uint32
- data []byte
-}
-
-func assembleCommitGraphBytes(t *testing.T, repo *Repository, chunks []chunkSpec) []byte {
- t.Helper()
- var buf bytes.Buffer
- buf.Grow(1024)
- var header [commitGraphHeaderSize]byte
- binary.BigEndian.PutUint32(header[0:4], commitGraphSignature)
- header[4] = commitGraphVersion
- header[5] = hashAlgoVersion(repo.hashAlgo)
- header[6] = byte(len(chunks))
- header[7] = 0
- buf.Write(header[:])
-
- tocStart := buf.Len()
- tocLen := (len(chunks) + 1) * commitGraphChunkEntrySize
- buf.Grow(tocLen)
- buf.Write(make([]byte, tocLen))
-
- offset := tocStart + tocLen
- for i, ch := range chunks {
- pos := tocStart + i*commitGraphChunkEntrySize
- binary.BigEndian.PutUint32(buf.Bytes()[pos:pos+4], ch.id)
- binary.BigEndian.PutUint64(buf.Bytes()[pos+4:pos+12], uint64(offset))
- offset += len(ch.data)
- }
- pos := tocStart + len(chunks)*commitGraphChunkEntrySize
- binary.BigEndian.PutUint32(buf.Bytes()[pos:pos+4], 0)
- binary.BigEndian.PutUint64(buf.Bytes()[pos+4:pos+12], uint64(offset))
-
- for _, ch := range chunks {
- buf.Write(ch.data)
- }
-
- h, err := repo.hashAlgo.New()
- if err != nil {
- t.Fatalf("hash.New failed: %v", err)
- }
- _, _ = h.Write(buf.Bytes())
- buf.Write(h.Sum(nil))
- return buf.Bytes()
-}
-
-func chunkRange(t *testing.T, repo *Repository, data []byte, id uint32) (int, int, bool) {
- t.Helper()
- hashSize := repo.hashAlgo.Size()
- numChunks := int(data[6])
- tocStart := commitGraphHeaderSize
- trailerStart := len(data) - hashSize
-
- for i := 0; i < numChunks; i++ {
- pos := tocStart + i*commitGraphChunkEntrySize
- chID := binary.BigEndian.Uint32(data[pos : pos+4])
- if chID == 0 {
- break
- }
- start := int(binary.BigEndian.Uint64(data[pos+4 : pos+12]))
- end := trailerStart
- if i+1 < numChunks {
- end = int(binary.BigEndian.Uint64(data[pos+commitGraphChunkEntrySize+4 : pos+commitGraphChunkEntrySize+12]))
- }
- if chID == id {
- return start, end, true
- }
- }
- return 0, 0, false
-}
-
-func replaceChunk(t *testing.T, repo *Repository, data []byte, id uint32, payload []byte) []byte {
- t.Helper()
- hashSize := repo.hashAlgo.Size()
- numChunks := int(data[6])
- tocStart := commitGraphHeaderSize
- trailerStart := len(data) - hashSize
-
- chunks := make([]chunkSpec, 0, numChunks)
- for i := 0; i < numChunks; i++ {
- pos := tocStart + i*commitGraphChunkEntrySize
- chID := binary.BigEndian.Uint32(data[pos : pos+4])
- if chID == 0 {
- break
- }
- start := int(binary.BigEndian.Uint64(data[pos+4 : pos+12]))
- end := trailerStart
- if i+1 < numChunks {
- end = int(binary.BigEndian.Uint64(data[pos+commitGraphChunkEntrySize+4 : pos+commitGraphChunkEntrySize+12]))
- }
- if chID == id {
- chunks = append(chunks, chunkSpec{chID, payload})
- } else {
- chunks = append(chunks, chunkSpec{chID, data[start:end]})
- }
- }
- if len(chunks) == 0 {
- t.Fatalf("no chunks found")
- }
- return assembleCommitGraphBytes(t, repo, chunks)
-}
-
-func injectChunk(t *testing.T, repo *Repository, data []byte, id uint32, payload []byte) []byte {
- t.Helper()
- hashSize := repo.hashAlgo.Size()
- numChunks := int(data[6])
- tocStart := commitGraphHeaderSize
- trailerStart := len(data) - hashSize
-
- chunks := make([]chunkSpec, 0, numChunks+1)
- for i := 0; i < numChunks; i++ {
- pos := tocStart + i*commitGraphChunkEntrySize
- chID := binary.BigEndian.Uint32(data[pos : pos+4])
- if chID == 0 {
- break
- }
- start := int(binary.BigEndian.Uint64(data[pos+4 : pos+12]))
- end := trailerStart
- if i+1 < numChunks {
- end = int(binary.BigEndian.Uint64(data[pos+commitGraphChunkEntrySize+4 : pos+commitGraphChunkEntrySize+12]))
- }
- chunks = append(chunks, chunkSpec{chID, data[start:end]})
- }
- chunks = append(chunks, chunkSpec{id, payload})
- return assembleCommitGraphBytes(t, repo, chunks)
-}
-
-func u32SliceToBytes(vals []uint32) []byte {
- out := make([]byte, len(vals)*4)
- for i, v := range vals {
- binary.BigEndian.PutUint32(out[i*4:i*4+4], v)
- }
- return out
-}
-
-func hashFromBytes(repo *Repository, b []byte) Hash {
- var h Hash
- copy(h.data[:], b)
- h.algo = repo.hashAlgo
- return h
-}
generated by cgit v1.3.1-10-gc9f91 (git 2.54.0) at 2026-05-25 17:47:52 +0000