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https://github.com/git/git.git
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Merge branch 'ds/sha256-leftover-bits'
midx and commit-graph files now use the byte defined in their file format specification for identifying the hash function used for object names. * ds/sha256-leftover-bits: multi-pack-index: use hash version byte commit-graph: use the "hash version" byte t/README: document GIT_TEST_DEFAULT_HASH
This commit is contained in:
commit
6f8a2138b9
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@ -42,8 +42,13 @@ HEADER:
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1-byte version number:
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Currently, the only valid version is 1.
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1-byte Hash Version (1 = SHA-1)
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We infer the hash length (H) from this value.
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1-byte Hash Version
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We infer the hash length (H) from this value:
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1 => SHA-1
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2 => SHA-256
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If the hash type does not match the repository's hash algorithm, the
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commit-graph file should be ignored with a warning presented to the
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user.
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1-byte number (C) of "chunks"
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@ -279,7 +279,12 @@ HEADER:
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Git only writes or recognizes version 1.
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1-byte Object Id Version
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Git only writes or recognizes version 1 (SHA1).
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We infer the length of object IDs (OIDs) from this value:
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1 => SHA-1
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2 => SHA-256
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If the hash type does not match the repository's hash algorithm,
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the multi-pack-index file should be ignored with a warning
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presented to the user.
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1-byte number of "chunks"
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@ -179,7 +179,14 @@ static char *get_chain_filename(struct object_directory *odb)
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static uint8_t oid_version(void)
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{
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return 1;
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switch (hash_algo_by_ptr(the_hash_algo)) {
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case GIT_HASH_SHA1:
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return 1;
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case GIT_HASH_SHA256:
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return 2;
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default:
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die(_("invalid hash version"));
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}
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}
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static struct commit_graph *alloc_commit_graph(void)
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35
midx.c
35
midx.c
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@ -17,7 +17,6 @@
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#define MIDX_BYTE_HASH_VERSION 5
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#define MIDX_BYTE_NUM_CHUNKS 6
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#define MIDX_BYTE_NUM_PACKS 8
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#define MIDX_HASH_VERSION 1
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#define MIDX_HEADER_SIZE 12
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#define MIDX_MIN_SIZE (MIDX_HEADER_SIZE + the_hash_algo->rawsz)
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@ -36,6 +35,18 @@
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#define PACK_EXPIRED UINT_MAX
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static uint8_t oid_version(void)
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{
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switch (hash_algo_by_ptr(the_hash_algo)) {
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case GIT_HASH_SHA1:
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return 1;
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case GIT_HASH_SHA256:
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return 2;
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default:
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die(_("invalid hash version"));
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}
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}
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static char *get_midx_filename(const char *object_dir)
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{
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return xstrfmt("%s/pack/multi-pack-index", object_dir);
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@ -90,8 +101,11 @@ struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local
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m->version);
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hash_version = m->data[MIDX_BYTE_HASH_VERSION];
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if (hash_version != MIDX_HASH_VERSION)
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die(_("hash version %u does not match"), hash_version);
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if (hash_version != oid_version()) {
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error(_("multi-pack-index hash version %u does not match version %u"),
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hash_version, oid_version());
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goto cleanup_fail;
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}
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m->hash_len = the_hash_algo->rawsz;
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m->num_chunks = m->data[MIDX_BYTE_NUM_CHUNKS];
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@ -418,7 +432,7 @@ static size_t write_midx_header(struct hashfile *f,
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hashwrite_be32(f, MIDX_SIGNATURE);
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byte_values[0] = MIDX_VERSION;
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byte_values[1] = MIDX_HASH_VERSION;
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byte_values[1] = oid_version();
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byte_values[2] = num_chunks;
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byte_values[3] = 0; /* unused */
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hashwrite(f, byte_values, sizeof(byte_values));
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@ -1105,8 +1119,17 @@ int verify_midx_file(struct repository *r, const char *object_dir, unsigned flag
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struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
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verify_midx_error = 0;
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if (!m)
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return 0;
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if (!m) {
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int result = 0;
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struct stat sb;
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char *filename = get_midx_filename(object_dir);
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if (!stat(filename, &sb)) {
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error(_("multi-pack-index file exists, but failed to parse"));
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result = 1;
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}
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free(filename);
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return result;
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}
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if (flags & MIDX_PROGRESS)
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progress = start_progress(_("Looking for referenced packfiles"),
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4
t/README
4
t/README
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@ -421,6 +421,10 @@ GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=<boolean>, when true (which is
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the default when running tests), errors out when an abbreviated option
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is used.
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GIT_TEST_DEFAULT_HASH=<hash-algo> specifies which hash algorithm to
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use in the test scripts. Recognized values for <hash-algo> are "sha1"
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and "sha256".
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Naming Tests
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------------
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@ -7,14 +7,18 @@
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static int read_midx_file(const char *object_dir)
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{
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uint32_t i;
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struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
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struct multi_pack_index *m;
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setup_git_directory();
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m = load_multi_pack_index(object_dir, 1);
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if (!m)
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return 1;
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printf("header: %08x %d %d %d\n",
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printf("header: %08x %d %d %d %d\n",
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m->signature,
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m->version,
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m->hash_len,
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m->num_chunks,
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m->num_packs);
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@ -30,12 +30,17 @@ test_expect_success 'setup test - repo, commits, commit graph, log outputs' '
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rm file_to_be_deleted &&
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git add . &&
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git commit -m "file removed" &&
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git commit-graph write --reachable --changed-paths
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git commit-graph write --reachable --changed-paths &&
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test_oid_cache <<-EOF
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oid_version sha1:1
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oid_version sha256:2
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EOF
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'
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graph_read_expect () {
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NUM_CHUNKS=5
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cat >expect <<- EOF
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header: 43475048 1 1 $NUM_CHUNKS 0
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header: 43475048 1 $(test_oid oid_version) $NUM_CHUNKS 0
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num_commits: $1
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chunks: oid_fanout oid_lookup commit_metadata bloom_indexes bloom_data
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EOF
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@ -10,7 +10,12 @@ test_expect_success 'setup full repo' '
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cd "$TRASH_DIRECTORY/full" &&
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git init &&
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git config core.commitGraph true &&
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objdir=".git/objects"
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objdir=".git/objects" &&
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test_oid_cache <<-EOF
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oid_version sha1:1
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oid_version sha256:2
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EOF
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'
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test_expect_success POSIXPERM 'tweak umask for modebit tests' '
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NUM_CHUNKS=$((3 + $(echo "$2" | wc -w)))
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fi
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cat >expect <<- EOF
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header: 43475048 1 1 $NUM_CHUNKS 0
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header: 43475048 1 $(test_oid oid_version) $NUM_CHUNKS 0
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num_commits: $1
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chunks: oid_fanout oid_lookup commit_metadata$OPTIONAL
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EOF
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@ -412,6 +417,35 @@ test_expect_success 'replace-objects invalidates commit-graph' '
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)
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'
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test_expect_success 'warn on improper hash version' '
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git init --object-format=sha1 sha1 &&
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(
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cd sha1 &&
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test_commit 1 &&
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git commit-graph write --reachable &&
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mv .git/objects/info/commit-graph ../cg-sha1
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) &&
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git init --object-format=sha256 sha256 &&
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(
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cd sha256 &&
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test_commit 1 &&
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git commit-graph write --reachable &&
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mv .git/objects/info/commit-graph ../cg-sha256
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) &&
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(
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cd sha1 &&
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mv ../cg-sha256 .git/objects/info/commit-graph &&
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git log -1 2>err &&
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test_i18ngrep "commit-graph hash version 2 does not match version 1" err
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) &&
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(
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cd sha256 &&
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mv ../cg-sha1 .git/objects/info/commit-graph &&
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git log -1 2>err &&
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test_i18ngrep "commit-graph hash version 1 does not match version 2" err
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)
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'
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# the verify tests below expect the commit-graph to contain
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# exactly the commits reachable from the commits/8 branch.
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# If the file changes the set of commits in the list, then the
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@ -5,6 +5,8 @@ test_description='multi-pack-indexes'
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objdir=.git/objects
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HASH_LEN=$(test_oid rawsz)
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midx_read_expect () {
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NUM_PACKS=$1
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NUM_OBJECTS=$2
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EXTRA_CHUNKS="$5"
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{
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cat <<-EOF &&
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header: 4d494458 1 $NUM_CHUNKS $NUM_PACKS
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header: 4d494458 1 $HASH_LEN $NUM_CHUNKS $NUM_PACKS
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chunks: pack-names oid-fanout oid-lookup object-offsets$EXTRA_CHUNKS
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num_objects: $NUM_OBJECTS
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packs:
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@ -46,7 +48,7 @@ test_expect_success "don't write midx with no packs" '
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test_path_is_missing pack/multi-pack-index
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'
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test_expect_success "Warn if a midx contains no oid" '
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test_expect_success SHA1 'warn if a midx contains no oid' '
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cp "$TEST_DIRECTORY"/t5319/no-objects.midx $objdir/pack/multi-pack-index &&
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test_must_fail git multi-pack-index verify &&
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rm $objdir/pack/multi-pack-index
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compare_results_with_midx "twelve packs"
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test_expect_success 'warn on improper hash version' '
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git init --object-format=sha1 sha1 &&
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(
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cd sha1 &&
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git config core.multiPackIndex true &&
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test_commit 1 &&
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git repack -a &&
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git multi-pack-index write &&
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mv .git/objects/pack/multi-pack-index ../mpi-sha1
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) &&
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git init --object-format=sha256 sha256 &&
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(
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cd sha256 &&
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git config core.multiPackIndex true &&
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test_commit 1 &&
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git repack -a &&
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git multi-pack-index write &&
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mv .git/objects/pack/multi-pack-index ../mpi-sha256
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) &&
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(
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cd sha1 &&
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mv ../mpi-sha256 .git/objects/pack/multi-pack-index &&
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git log -1 2>err &&
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test_i18ngrep "multi-pack-index hash version 2 does not match version 1" err
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) &&
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(
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cd sha256 &&
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mv ../mpi-sha1 .git/objects/pack/multi-pack-index &&
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git log -1 2>err &&
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test_i18ngrep "multi-pack-index hash version 1 does not match version 2" err
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)
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'
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test_expect_success 'verify multi-pack-index success' '
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git multi-pack-index verify --object-dir=$objdir
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'
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@ -243,7 +279,6 @@ test_expect_success 'verify bad signature' '
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"multi-pack-index signature"
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'
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HASH_LEN=$(test_oid rawsz)
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NUM_OBJECTS=74
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MIDX_BYTE_VERSION=4
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MIDX_BYTE_OID_VERSION=5
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@ -272,7 +307,7 @@ test_expect_success 'verify bad version' '
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'
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test_expect_success 'verify bad OID version' '
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corrupt_midx_and_verify $MIDX_BYTE_OID_VERSION "\02" $objdir \
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corrupt_midx_and_verify $MIDX_BYTE_OID_VERSION "\03" $objdir \
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"hash version"
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'
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@ -18,6 +18,9 @@ test_expect_success 'setup repo' '
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base sha1:1376
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base sha256:1496
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oid_version sha1:1
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oid_version sha256:2
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EOM
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'
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@ -28,7 +31,7 @@ graph_read_expect() {
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NUM_BASE=$2
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fi
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cat >expect <<- EOF
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header: 43475048 1 1 3 $NUM_BASE
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header: 43475048 1 $(test_oid oid_version) 3 $NUM_BASE
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num_commits: $1
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chunks: oid_fanout oid_lookup commit_metadata
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EOF
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