Commit 2ad1525099e430827d901e52cd0dd580ce1b7a8f
2021-02-01T09:58:25
Merge pull request #5762 from lhchavez/cgraph-parser commit-graph: Introduce a parser for commit-graph files
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diff --git a/fuzzers/commit_graph_fuzzer.c b/fuzzers/commit_graph_fuzzer.c
new file mode 100644
index 0000000..f5b9c89
--- /dev/null
+++ b/fuzzers/commit_graph_fuzzer.c
@@ -0,0 +1,75 @@
+/*
+ * libgit2 commit-graph fuzzer target.
+ *
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include <stdio.h>
+
+#include "git2.h"
+
+#include "buffer.h"
+#include "common.h"
+#include "futils.h"
+#include "hash.h"
+#include "commit_graph.h"
+
+int LLVMFuzzerInitialize(int *argc, char ***argv)
+{
+ GIT_UNUSED(argc);
+ GIT_UNUSED(argv);
+
+ if (git_libgit2_init() < 0) {
+ fprintf(stderr, "Failed to initialize libgit2\n");
+ abort();
+ }
+ return 0;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+ git_commit_graph_file cgraph = {{0}};
+ git_buf commit_graph_buf = GIT_BUF_INIT;
+ git_oid oid = {{0}};
+ bool append_hash = false;
+
+ if (size < 4)
+ return 0;
+
+ /*
+ * If the first byte in the stream has the high bit set, append the
+ * SHA1 hash so that the file is somewhat valid.
+ */
+ append_hash = *data & 0x80;
+ /* Keep a 4-byte alignment to avoid unaligned accesses. */
+ data += 4;
+ size -= 4;
+
+ if (append_hash) {
+ if (git_buf_init(&commit_graph_buf, size + sizeof(oid)) < 0)
+ goto cleanup;
+ if (git_hash_buf(&oid, data, size) < 0) {
+ fprintf(stderr, "Failed to compute the SHA1 hash\n");
+ abort();
+ }
+ memcpy(commit_graph_buf.ptr, data, size);
+ memcpy(commit_graph_buf.ptr + size, &oid, sizeof(oid));
+ } else {
+ git_buf_attach_notowned(&commit_graph_buf, (char *)data, size);
+ }
+
+ if (git_commit_graph_parse(
+ &cgraph,
+ (const unsigned char *)git_buf_cstr(&commit_graph_buf),
+ git_buf_len(&commit_graph_buf))
+ < 0)
+ goto cleanup;
+
+cleanup:
+ git_commit_graph_close(&cgraph);
+ git_buf_dispose(&commit_graph_buf);
+ return 0;
+}
diff --git a/fuzzers/corpora/commit_graph/005682ce1cb5b20c20fccf4be5dbd47ca399e53e b/fuzzers/corpora/commit_graph/005682ce1cb5b20c20fccf4be5dbd47ca399e53e
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diff --git a/src/commit_graph.c b/src/commit_graph.c
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--- /dev/null
+++ b/src/commit_graph.c
@@ -0,0 +1,299 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "commit_graph.h"
+
+#include "futils.h"
+#include "hash.h"
+
+#define GIT_COMMIT_GRAPH_MISSING_PARENT 0x70000000
+
+#define COMMIT_GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
+#define COMMIT_GRAPH_VERSION 1
+#define COMMIT_GRAPH_OBJECT_ID_VERSION 1
+struct git_commit_graph_header {
+ uint32_t signature;
+ uint8_t version;
+ uint8_t object_id_version;
+ uint8_t chunks;
+ uint8_t base_graph_files;
+};
+
+#define COMMIT_GRAPH_OID_FANOUT_ID 0x4f494446 /* "OIDF" */
+#define COMMIT_GRAPH_OID_LOOKUP_ID 0x4f49444c /* "OIDL" */
+#define COMMIT_GRAPH_COMMIT_DATA_ID 0x43444154 /* "CDAT" */
+#define COMMIT_GRAPH_EXTRA_EDGE_LIST_ID 0x45444745 /* "EDGE" */
+#define COMMIT_GRAPH_BLOOM_FILTER_INDEX_ID 0x42494458 /* "BIDX" */
+#define COMMIT_GRAPH_BLOOM_FILTER_DATA_ID 0x42444154 /* "BDAT" */
+
+struct git_commit_graph_chunk {
+ off64_t offset;
+ size_t length;
+};
+
+static int commit_graph_error(const char *message)
+{
+ git_error_set(GIT_ERROR_ODB, "invalid commit-graph file - %s", message);
+ return -1;
+}
+
+static int commit_graph_parse_oid_fanout(
+ git_commit_graph_file *cgraph,
+ const unsigned char *data,
+ struct git_commit_graph_chunk *chunk_oid_fanout)
+{
+ uint32_t i, nr;
+ if (chunk_oid_fanout->offset == 0)
+ return commit_graph_error("missing OID Fanout chunk");
+ if (chunk_oid_fanout->length == 0)
+ return commit_graph_error("empty OID Fanout chunk");
+ if (chunk_oid_fanout->length != 256 * 4)
+ return commit_graph_error("OID Fanout chunk has wrong length");
+
+ cgraph->oid_fanout = (const uint32_t *)(data + chunk_oid_fanout->offset);
+ nr = 0;
+ for (i = 0; i < 256; ++i) {
+ uint32_t n = ntohl(cgraph->oid_fanout[i]);
+ if (n < nr)
+ return commit_graph_error("index is non-monotonic");
+ nr = n;
+ }
+ cgraph->num_commits = nr;
+ return 0;
+}
+
+static int commit_graph_parse_oid_lookup(
+ git_commit_graph_file *cgraph,
+ const unsigned char *data,
+ struct git_commit_graph_chunk *chunk_oid_lookup)
+{
+ uint32_t i;
+ git_oid *oid, *prev_oid, zero_oid = {{0}};
+
+ if (chunk_oid_lookup->offset == 0)
+ return commit_graph_error("missing OID Lookup chunk");
+ if (chunk_oid_lookup->length == 0)
+ return commit_graph_error("empty OID Lookup chunk");
+ if (chunk_oid_lookup->length != cgraph->num_commits * GIT_OID_RAWSZ)
+ return commit_graph_error("OID Lookup chunk has wrong length");
+
+ cgraph->oid_lookup = oid = (git_oid *)(data + chunk_oid_lookup->offset);
+ prev_oid = &zero_oid;
+ for (i = 0; i < cgraph->num_commits; ++i, ++oid) {
+ if (git_oid_cmp(prev_oid, oid) >= 0)
+ return commit_graph_error("OID Lookup index is non-monotonic");
+ prev_oid = oid;
+ }
+
+ return 0;
+}
+
+static int commit_graph_parse_commit_data(
+ git_commit_graph_file *cgraph,
+ const unsigned char *data,
+ struct git_commit_graph_chunk *chunk_commit_data)
+{
+ if (chunk_commit_data->offset == 0)
+ return commit_graph_error("missing Commit Data chunk");
+ if (chunk_commit_data->length == 0)
+ return commit_graph_error("empty Commit Data chunk");
+ if (chunk_commit_data->length != cgraph->num_commits * (GIT_OID_RAWSZ + 16))
+ return commit_graph_error("Commit Data chunk has wrong length");
+
+ cgraph->commit_data = data + chunk_commit_data->offset;
+
+ return 0;
+}
+
+static int commit_graph_parse_extra_edge_list(
+ git_commit_graph_file *cgraph,
+ const unsigned char *data,
+ struct git_commit_graph_chunk *chunk_extra_edge_list)
+{
+ if (chunk_extra_edge_list->length == 0)
+ return 0;
+ if (chunk_extra_edge_list->length % 4 != 0)
+ return commit_graph_error("malformed Extra Edge List chunk");
+
+ cgraph->extra_edge_list = data + chunk_extra_edge_list->offset;
+ cgraph->num_extra_edge_list = chunk_extra_edge_list->length / 4;
+
+ return 0;
+}
+
+int git_commit_graph_parse(git_commit_graph_file *cgraph, const unsigned char *data, size_t size)
+{
+ struct git_commit_graph_header *hdr;
+ const unsigned char *chunk_hdr;
+ struct git_commit_graph_chunk *last_chunk;
+ uint32_t i;
+ off64_t last_chunk_offset, chunk_offset, trailer_offset;
+ git_oid cgraph_checksum = {{0}};
+ int error;
+ struct git_commit_graph_chunk chunk_oid_fanout = {0}, chunk_oid_lookup = {0},
+ chunk_commit_data = {0}, chunk_extra_edge_list = {0},
+ chunk_unsupported = {0};
+
+ GIT_ASSERT_ARG(cgraph);
+
+ if (size < sizeof(struct git_commit_graph_header) + GIT_OID_RAWSZ)
+ return commit_graph_error("commit-graph is too short");
+
+ hdr = ((struct git_commit_graph_header *)data);
+
+ if (hdr->signature != htonl(COMMIT_GRAPH_SIGNATURE) || hdr->version != COMMIT_GRAPH_VERSION
+ || hdr->object_id_version != COMMIT_GRAPH_OBJECT_ID_VERSION) {
+ return commit_graph_error("unsupported commit-graph version");
+ }
+ if (hdr->chunks == 0)
+ return commit_graph_error("no chunks in commit-graph");
+
+ /*
+ * The very first chunk's offset should be after the header, all the chunk
+ * headers, and a special zero chunk.
+ */
+ last_chunk_offset = sizeof(struct git_commit_graph_header) + (1 + hdr->chunks) * 12;
+ trailer_offset = size - GIT_OID_RAWSZ;
+ if (trailer_offset < last_chunk_offset)
+ return commit_graph_error("wrong commit-graph size");
+ git_oid_cpy(&cgraph->checksum, (git_oid *)(data + trailer_offset));
+
+ if (git_hash_buf(&cgraph_checksum, data, (size_t)trailer_offset) < 0)
+ return commit_graph_error("could not calculate signature");
+ if (!git_oid_equal(&cgraph_checksum, &cgraph->checksum))
+ return commit_graph_error("index signature mismatch");
+
+ chunk_hdr = data + sizeof(struct git_commit_graph_header);
+ last_chunk = NULL;
+ for (i = 0; i < hdr->chunks; ++i, chunk_hdr += 12) {
+ chunk_offset = ((off64_t)ntohl(*((uint32_t *)(chunk_hdr + 4)))) << 32
+ | ((off64_t)ntohl(*((uint32_t *)(chunk_hdr + 8))));
+ if (chunk_offset < last_chunk_offset)
+ return commit_graph_error("chunks are non-monotonic");
+ if (chunk_offset >= trailer_offset)
+ return commit_graph_error("chunks extend beyond the trailer");
+ if (last_chunk != NULL)
+ last_chunk->length = (size_t)(chunk_offset - last_chunk_offset);
+ last_chunk_offset = chunk_offset;
+
+ switch (ntohl(*((uint32_t *)(chunk_hdr + 0)))) {
+ case COMMIT_GRAPH_OID_FANOUT_ID:
+ chunk_oid_fanout.offset = last_chunk_offset;
+ last_chunk = &chunk_oid_fanout;
+ break;
+
+ case COMMIT_GRAPH_OID_LOOKUP_ID:
+ chunk_oid_lookup.offset = last_chunk_offset;
+ last_chunk = &chunk_oid_lookup;
+ break;
+
+ case COMMIT_GRAPH_COMMIT_DATA_ID:
+ chunk_commit_data.offset = last_chunk_offset;
+ last_chunk = &chunk_commit_data;
+ break;
+
+ case COMMIT_GRAPH_EXTRA_EDGE_LIST_ID:
+ chunk_extra_edge_list.offset = last_chunk_offset;
+ last_chunk = &chunk_extra_edge_list;
+ break;
+
+ case COMMIT_GRAPH_BLOOM_FILTER_INDEX_ID:
+ case COMMIT_GRAPH_BLOOM_FILTER_DATA_ID:
+ chunk_unsupported.offset = last_chunk_offset;
+ last_chunk = &chunk_unsupported;
+ break;
+
+ default:
+ return commit_graph_error("unrecognized chunk ID");
+ }
+ }
+ last_chunk->length = (size_t)(trailer_offset - last_chunk_offset);
+
+ error = commit_graph_parse_oid_fanout(cgraph, data, &chunk_oid_fanout);
+ if (error < 0)
+ return error;
+ error = commit_graph_parse_oid_lookup(cgraph, data, &chunk_oid_lookup);
+ if (error < 0)
+ return error;
+ error = commit_graph_parse_commit_data(cgraph, data, &chunk_commit_data);
+ if (error < 0)
+ return error;
+ error = commit_graph_parse_extra_edge_list(cgraph, data, &chunk_extra_edge_list);
+ if (error < 0)
+ return error;
+
+ return 0;
+}
+
+int git_commit_graph_open(git_commit_graph_file **cgraph_out, const char *path)
+{
+ git_commit_graph_file *cgraph;
+ git_file fd = -1;
+ size_t cgraph_size;
+ struct stat st;
+ int error;
+
+ /* TODO: properly open the file without access time using O_NOATIME */
+ fd = git_futils_open_ro(path);
+ if (fd < 0)
+ return fd;
+
+ if (p_fstat(fd, &st) < 0) {
+ p_close(fd);
+ git_error_set(GIT_ERROR_ODB, "multi-pack-index file not found - '%s'", path);
+ return -1;
+ }
+
+ if (!S_ISREG(st.st_mode) || !git__is_sizet(st.st_size)) {
+ p_close(fd);
+ git_error_set(GIT_ERROR_ODB, "invalid pack index '%s'", path);
+ return -1;
+ }
+ cgraph_size = (size_t)st.st_size;
+
+ cgraph = git__calloc(1, sizeof(git_commit_graph_file));
+ GIT_ERROR_CHECK_ALLOC(cgraph);
+
+ error = git_buf_sets(&cgraph->filename, path);
+ if (error < 0)
+ return error;
+
+ error = git_futils_mmap_ro(&cgraph->graph_map, fd, 0, cgraph_size);
+ p_close(fd);
+ if (error < 0) {
+ git_commit_graph_free(cgraph);
+ return error;
+ }
+
+ if ((error = git_commit_graph_parse(cgraph, cgraph->graph_map.data, cgraph_size)) < 0) {
+ git_commit_graph_free(cgraph);
+ return error;
+ }
+
+ *cgraph_out = cgraph;
+ return 0;
+}
+
+int git_commit_graph_close(git_commit_graph_file *cgraph)
+{
+ GIT_ASSERT_ARG(cgraph);
+
+ if (cgraph->graph_map.data)
+ git_futils_mmap_free(&cgraph->graph_map);
+
+ return 0;
+}
+
+void git_commit_graph_free(git_commit_graph_file *cgraph)
+{
+ if (!cgraph)
+ return;
+
+ git_buf_dispose(&cgraph->filename);
+ git_commit_graph_close(cgraph);
+ git__free(cgraph);
+}
diff --git a/src/commit_graph.h b/src/commit_graph.h
new file mode 100644
index 0000000..01512d7
--- /dev/null
+++ b/src/commit_graph.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_commit_graph_h__
+#define INCLUDE_commit_graph_h__
+
+#include "common.h"
+
+#include "map.h"
+
+/**
+ * A commit-graph file.
+ *
+ * This file contains metadata about commits, particularly the generation
+ * number for each one. This can help speed up graph operations without
+ * requiring a full graph traversal.
+ *
+ * Support for this feature was added in git 2.19.
+ */
+typedef struct git_commit_graph_file {
+ git_map graph_map;
+
+ /* The OID Fanout table. */
+ const uint32_t *oid_fanout;
+ /* The total number of commits in the graph. */
+ uint32_t num_commits;
+
+ /* The OID Lookup table. */
+ git_oid *oid_lookup;
+
+ /*
+ * The Commit Data table. Each entry contains the OID of the commit followed
+ * by two 8-byte fields in network byte order:
+ * - The indices of the first two parents (32 bits each).
+ * - The generation number (first 30 bits) and commit time in seconds since
+ * UNIX epoch (34 bits).
+ */
+ const unsigned char *commit_data;
+
+ /*
+ * The Extra Edge List table. Each 4-byte entry is a network byte order index
+ * of one of the i-th (i > 0) parents of commits in the `commit_data` table,
+ * when the commit has more than 2 parents.
+ */
+ const unsigned char *extra_edge_list;
+ /* The number of entries in the Extra Edge List table. Each entry is 4 bytes wide. */
+ size_t num_extra_edge_list;
+
+ /* The trailer of the file. Contains the SHA1-checksum of the whole file. */
+ git_oid checksum;
+
+ /* something like ".git/objects/info/commit-graph". */
+ git_buf filename;
+} git_commit_graph_file;
+
+int git_commit_graph_open(git_commit_graph_file **cgraph_out, const char *path);
+int git_commit_graph_close(git_commit_graph_file *cgraph);
+void git_commit_graph_free(git_commit_graph_file *cgraph);
+
+/* This is exposed for use in the fuzzers. */
+int git_commit_graph_parse(git_commit_graph_file *cgraph, const unsigned char *data, size_t size);
+
+#endif
diff --git a/tests/graph/commit_graph.c b/tests/graph/commit_graph.c
new file mode 100644
index 0000000..329aa5b
--- /dev/null
+++ b/tests/graph/commit_graph.c
@@ -0,0 +1,20 @@
+#include "clar_libgit2.h"
+
+#include <git2.h>
+
+#include "commit_graph.h"
+
+void test_graph_commit_graph__parse(void)
+{
+ git_repository *repo;
+ struct git_commit_graph_file *cgraph;
+ git_buf commit_graph_path = GIT_BUF_INIT;
+
+ cl_git_pass(git_repository_open(&repo, cl_fixture("testrepo.git")));
+ cl_git_pass(git_buf_joinpath(&commit_graph_path, git_repository_path(repo), "objects/info/commit-graph"));
+ cl_git_pass(git_commit_graph_open(&cgraph, git_buf_cstr(&commit_graph_path)));
+
+ git_commit_graph_free(cgraph);
+ git_repository_free(repo);
+ git_buf_dispose(&commit_graph_path);
+}
diff --git a/tests/resources/testrepo.git/objects/info/commit-graph b/tests/resources/testrepo.git/objects/info/commit-graph
new file mode 100644
index 0000000..2ef31d8
Binary files /dev/null and b/tests/resources/testrepo.git/objects/info/commit-graph differ