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author | Junio C Hamano <gitster@pobox.com> | 2020-08-11 18:04:11 -0700 |
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committer | Junio C Hamano <gitster@pobox.com> | 2020-08-11 18:04:11 -0700 |
commit | e0ad9574ddf5bb14d9ed6808112485ce0da99fea (patch) | |
tree | 633eb1867a929588ec5b3d8af351a93ba62aac5a /bundle.c | |
parent | 4f0a8be78499454eac3985b6e7e144b8376ab0a5 (diff) | |
parent | e023ff0691ca207d421a0e75ea23c132ada9142a (diff) | |
download | git-e0ad9574ddf5bb14d9ed6808112485ce0da99fea.tar.gz |
Merge branch 'bc/sha-256-part-3'
The final leg of SHA-256 transition.
* bc/sha-256-part-3: (39 commits)
t: remove test_oid_init in tests
docs: add documentation for extensions.objectFormat
ci: run tests with SHA-256
t: make SHA1 prerequisite depend on default hash
t: allow testing different hash algorithms via environment
t: add test_oid option to select hash algorithm
repository: enable SHA-256 support by default
setup: add support for reading extensions.objectformat
bundle: add new version for use with SHA-256
builtin/verify-pack: implement an --object-format option
http-fetch: set up git directory before parsing pack hashes
t0410: mark test with SHA1 prerequisite
t5308: make test work with SHA-256
t9700: make hash size independent
t9500: ensure that algorithm info is preserved in config
t9350: make hash size independent
t9301: make hash size independent
t9300: use $ZERO_OID instead of hard-coded object ID
t9300: abstract away SHA-1-specific constants
t8011: make hash size independent
...
Diffstat (limited to 'bundle.c')
-rw-r--r-- | bundle.c | 83 |
1 files changed, 62 insertions, 21 deletions
@@ -12,7 +12,16 @@ #include "refs.h" #include "strvec.h" -static const char bundle_signature[] = "# v2 git bundle\n"; + +static const char v2_bundle_signature[] = "# v2 git bundle\n"; +static const char v3_bundle_signature[] = "# v3 git bundle\n"; +static struct { + int version; + const char *signature; +} bundle_sigs[] = { + { 2, v2_bundle_signature }, + { 3, v3_bundle_signature }, +}; static void add_to_ref_list(const struct object_id *oid, const char *name, struct ref_list *list) @@ -23,15 +32,30 @@ static void add_to_ref_list(const struct object_id *oid, const char *name, list->nr++; } -static const struct git_hash_algo *detect_hash_algo(struct strbuf *buf) +static int parse_capability(struct bundle_header *header, const char *capability) +{ + const char *arg; + if (skip_prefix(capability, "object-format=", &arg)) { + int algo = hash_algo_by_name(arg); + if (algo == GIT_HASH_UNKNOWN) + return error(_("unrecognized bundle hash algorithm: %s"), arg); + header->hash_algo = &hash_algos[algo]; + return 0; + } + return error(_("unknown capability '%s'"), capability); +} + +static int parse_bundle_signature(struct bundle_header *header, const char *line) { - size_t len = strcspn(buf->buf, " \n"); - int algo; + int i; - algo = hash_algo_by_length(len / 2); - if (algo == GIT_HASH_UNKNOWN) - return NULL; - return &hash_algos[algo]; + for (i = 0; i < ARRAY_SIZE(bundle_sigs); i++) { + if (!strcmp(line, bundle_sigs[i].signature)) { + header->version = bundle_sigs[i].version; + return 0; + } + } + return -1; } static int parse_bundle_header(int fd, struct bundle_header *header, @@ -42,14 +66,16 @@ static int parse_bundle_header(int fd, struct bundle_header *header, /* The bundle header begins with the signature */ if (strbuf_getwholeline_fd(&buf, fd, '\n') || - strcmp(buf.buf, bundle_signature)) { + parse_bundle_signature(header, buf.buf)) { if (report_path) - error(_("'%s' does not look like a v2 bundle file"), + error(_("'%s' does not look like a v2 or v3 bundle file"), report_path); status = -1; goto abort; } + header->hash_algo = the_hash_algo; + /* The bundle header ends with an empty line */ while (!strbuf_getwholeline_fd(&buf, fd, '\n') && buf.len && buf.buf[0] != '\n') { @@ -57,19 +83,19 @@ static int parse_bundle_header(int fd, struct bundle_header *header, int is_prereq = 0; const char *p; - if (*buf.buf == '-') { - is_prereq = 1; - strbuf_remove(&buf, 0, 1); - } strbuf_rtrim(&buf); - if (!header->hash_algo) { - header->hash_algo = detect_hash_algo(&buf); - if (!header->hash_algo) { - error(_("unknown hash algorithm length")); + if (header->version == 3 && *buf.buf == '@') { + if (parse_capability(header, buf.buf + 1)) { status = -1; break; } + continue; + } + + if (*buf.buf == '-') { + is_prereq = 1; + strbuf_remove(&buf, 0, 1); } /* @@ -449,13 +475,14 @@ static int write_bundle_refs(int bundle_fd, struct rev_info *revs) } int create_bundle(struct repository *r, const char *path, - int argc, const char **argv, struct strvec *pack_options) + int argc, const char **argv, struct strvec *pack_options, int version) { struct lock_file lock = LOCK_INIT; int bundle_fd = -1; int bundle_to_stdout; int ref_count = 0; struct rev_info revs; + int min_version = the_hash_algo == &hash_algos[GIT_HASH_SHA1] ? 2 : 3; bundle_to_stdout = !strcmp(path, "-"); if (bundle_to_stdout) @@ -464,8 +491,22 @@ int create_bundle(struct repository *r, const char *path, bundle_fd = hold_lock_file_for_update(&lock, path, LOCK_DIE_ON_ERROR); - /* write signature */ - write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature)); + if (version == -1) + version = min_version; + + if (version < 2 || version > 3) { + die(_("unsupported bundle version %d"), version); + } else if (version < min_version) { + die(_("cannot write bundle version %d with algorithm %s"), version, the_hash_algo->name); + } else if (version == 2) { + write_or_die(bundle_fd, v2_bundle_signature, strlen(v2_bundle_signature)); + } else { + const char *capability = "@object-format="; + write_or_die(bundle_fd, v3_bundle_signature, strlen(v3_bundle_signature)); + write_or_die(bundle_fd, capability, strlen(capability)); + write_or_die(bundle_fd, the_hash_algo->name, strlen(the_hash_algo->name)); + write_or_die(bundle_fd, "\n", 1); + } /* init revs to list objects for pack-objects later */ save_commit_buffer = 0; |