зеркало из https://github.com/microsoft/git.git
bundle: add new version for use with SHA-256
Currently we detect the hash algorithm in use by the length of the object ID. This is inelegant and prevents us from using a different hash algorithm that is also 256 bits in length. Since we cannot extend the v2 format in a backward-compatible way, let's add a v3 format, which is identical, except for the addition of capabilities, which are prefixed by an at sign. We add "object-format" as the only capability and reject unknown capabilities, since we do not have a network connection and therefore cannot negotiate with the other side. For compatibility, default to the v2 format for SHA-1 and require v3 for SHA-256. In t5510, always use format v3 so we can be sure we produce consistent results across hash algorithms. Since head -n N lists the top N lines instead of the Nth line, let's run our output through sed to normalize it and compare it against a fixed value, which will make sure we get exactly what we're expecting. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Родитель
e74b606d47
Коммит
c5aecfc866
|
@ -9,7 +9,8 @@ git-bundle - Move objects and refs by archive
|
|||
SYNOPSIS
|
||||
--------
|
||||
[verse]
|
||||
'git bundle' create [-q | --quiet | --progress | --all-progress] [--all-progress-implied] <file> <git-rev-list-args>
|
||||
'git bundle' create [-q | --quiet | --progress | --all-progress] [--all-progress-implied]
|
||||
[--version=<version>] <file> <git-rev-list-args>
|
||||
'git bundle' verify [-q | --quiet] <file>
|
||||
'git bundle' list-heads <file> [<refname>...]
|
||||
'git bundle' unbundle <file> [<refname>...]
|
||||
|
@ -102,6 +103,12 @@ unbundle <file>::
|
|||
is activated. Unlike --all-progress this flag doesn't actually
|
||||
force any progress display by itself.
|
||||
|
||||
--version=<version>::
|
||||
Specify the bundle version. Version 2 is the older format and can only be
|
||||
used with SHA-1 repositories; the newer version 3 contains capabilities that
|
||||
permit extensions. The default is the oldest supported format, based on the
|
||||
hash algorithm in use.
|
||||
|
||||
-q::
|
||||
--quiet::
|
||||
This flag makes the command not to report its progress
|
||||
|
|
|
@ -7,6 +7,8 @@ The Git bundle format is a format that represents both refs and Git objects.
|
|||
We will use ABNF notation to define the Git bundle format. See
|
||||
protocol-common.txt for the details.
|
||||
|
||||
A v2 bundle looks like this:
|
||||
|
||||
----
|
||||
bundle = signature *prerequisite *reference LF pack
|
||||
signature = "# v2 git bundle" LF
|
||||
|
@ -18,9 +20,28 @@ reference = obj-id SP refname LF
|
|||
pack = ... ; packfile
|
||||
----
|
||||
|
||||
A v3 bundle looks like this:
|
||||
|
||||
----
|
||||
bundle = signature *capability *prerequisite *reference LF pack
|
||||
signature = "# v3 git bundle" LF
|
||||
|
||||
capability = "@" key ["=" value] LF
|
||||
prerequisite = "-" obj-id SP comment LF
|
||||
comment = *CHAR
|
||||
reference = obj-id SP refname LF
|
||||
key = 1*(ALPHA / DIGIT / "-")
|
||||
value = *(%01-09 / %0b-FF)
|
||||
|
||||
pack = ... ; packfile
|
||||
----
|
||||
|
||||
== Semantics
|
||||
|
||||
A Git bundle consists of three parts.
|
||||
A Git bundle consists of several parts.
|
||||
|
||||
* "Capabilities", which are only in the v3 format, indicate functionality that
|
||||
the bundle requires to be read properly.
|
||||
|
||||
* "Prerequisites" lists the objects that are NOT included in the bundle and the
|
||||
reader of the bundle MUST already have, in order to use the data in the
|
||||
|
@ -46,3 +67,10 @@ put any string here. The reader of the bundle MUST ignore the comment.
|
|||
Note that the prerequisites does not represent a shallow-clone boundary. The
|
||||
semantics of the prerequisites and the shallow-clone boundaries are different,
|
||||
and the Git bundle v2 format cannot represent a shallow clone repository.
|
||||
|
||||
== Capabilities
|
||||
|
||||
Because there is no opportunity for negotiation, unknown capabilities cause 'git
|
||||
bundle' to abort. The only known capability is `object-format`, which specifies
|
||||
the hash algorithm in use, and can take the same values as the
|
||||
`extensions.objectFormat` configuration value.
|
||||
|
|
|
@ -60,6 +60,7 @@ static int cmd_bundle_create(int argc, const char **argv, const char *prefix) {
|
|||
int all_progress_implied = 0;
|
||||
int progress = isatty(STDERR_FILENO);
|
||||
struct argv_array pack_opts;
|
||||
int version = -1;
|
||||
|
||||
struct option options[] = {
|
||||
OPT_SET_INT('q', "quiet", &progress,
|
||||
|
@ -71,6 +72,8 @@ static int cmd_bundle_create(int argc, const char **argv, const char *prefix) {
|
|||
OPT_BOOL(0, "all-progress-implied",
|
||||
&all_progress_implied,
|
||||
N_("similar to --all-progress when progress meter is shown")),
|
||||
OPT_INTEGER(0, "version", &version,
|
||||
N_("specify bundle format version")),
|
||||
OPT_END()
|
||||
};
|
||||
const char* bundle_file;
|
||||
|
@ -91,7 +94,7 @@ static int cmd_bundle_create(int argc, const char **argv, const char *prefix) {
|
|||
|
||||
if (!startup_info->have_repository)
|
||||
die(_("Need a repository to create a bundle."));
|
||||
return !!create_bundle(the_repository, bundle_file, argc, argv, &pack_opts);
|
||||
return !!create_bundle(the_repository, bundle_file, argc, argv, &pack_opts, version);
|
||||
}
|
||||
|
||||
static int cmd_bundle_verify(int argc, const char **argv, const char *prefix) {
|
||||
|
|
83
bundle.c
83
bundle.c
|
@ -12,7 +12,16 @@
|
|||
#include "refs.h"
|
||||
#include "argv-array.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)
|
||||
{
|
||||
size_t len = strcspn(buf->buf, " \n");
|
||||
int algo;
|
||||
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);
|
||||
}
|
||||
|
||||
algo = hash_algo_by_length(len / 2);
|
||||
if (algo == GIT_HASH_UNKNOWN)
|
||||
return NULL;
|
||||
return &hash_algos[algo];
|
||||
static int parse_bundle_signature(struct bundle_header *header, const char *line)
|
||||
{
|
||||
int i;
|
||||
|
||||
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 argv_array *pack_options)
|
||||
int argc, const char **argv, struct argv_array *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;
|
||||
|
|
4
bundle.h
4
bundle.h
|
@ -13,6 +13,7 @@ struct ref_list {
|
|||
};
|
||||
|
||||
struct bundle_header {
|
||||
unsigned version;
|
||||
struct ref_list prerequisites;
|
||||
struct ref_list references;
|
||||
const struct git_hash_algo *hash_algo;
|
||||
|
@ -21,7 +22,8 @@ struct bundle_header {
|
|||
int is_bundle(const char *path, int quiet);
|
||||
int read_bundle_header(const char *path, struct bundle_header *header);
|
||||
int create_bundle(struct repository *r, const char *path,
|
||||
int argc, const char **argv, struct argv_array *pack_options);
|
||||
int argc, const char **argv, struct argv_array *pack_options,
|
||||
int version);
|
||||
int verify_bundle(struct repository *r, struct bundle_header *header, int verbose);
|
||||
#define BUNDLE_VERBOSE 1
|
||||
int unbundle(struct repository *r, struct bundle_header *header,
|
||||
|
|
|
@ -281,15 +281,19 @@ test_expect_success 'create bundle 1' '
|
|||
cd "$D" &&
|
||||
echo >file updated again by origin &&
|
||||
git commit -a -m "tip" &&
|
||||
git bundle create bundle1 master^..master
|
||||
git bundle create --version=3 bundle1 master^..master
|
||||
'
|
||||
|
||||
test_expect_success 'header of bundle looks right' '
|
||||
head -n 4 "$D"/bundle1 &&
|
||||
head -n 1 "$D"/bundle1 | grep "^#" &&
|
||||
head -n 2 "$D"/bundle1 | grep "^-$OID_REGEX " &&
|
||||
head -n 3 "$D"/bundle1 | grep "^$OID_REGEX " &&
|
||||
head -n 4 "$D"/bundle1 | grep "^$"
|
||||
cat >expect <<-EOF &&
|
||||
# v3 git bundle
|
||||
@object-format=$(test_oid algo)
|
||||
-OID updated by origin
|
||||
OID refs/heads/master
|
||||
|
||||
EOF
|
||||
sed -e "s/$OID_REGEX/OID/g" -e "5q" "$D"/bundle1 >actual &&
|
||||
test_cmp expect actual
|
||||
'
|
||||
|
||||
test_expect_success 'create bundle 2' '
|
||||
|
|
|
@ -4,6 +4,10 @@ test_description='some bundle related tests'
|
|||
. ./test-lib.sh
|
||||
|
||||
test_expect_success 'setup' '
|
||||
test_oid_cache <<-EOF &&
|
||||
version sha1:2
|
||||
version sha256:3
|
||||
EOF
|
||||
test_commit initial &&
|
||||
test_tick &&
|
||||
git tag -m tag tag &&
|
||||
|
@ -94,4 +98,31 @@ test_expect_success 'fetch SHA-1 from bundle' '
|
|||
git fetch --no-tags foo/tip.bundle "$(cat hash)"
|
||||
'
|
||||
|
||||
test_expect_success 'git bundle uses expected default format' '
|
||||
git bundle create bundle HEAD^.. &&
|
||||
head -n1 bundle | grep "^# v$(test_oid version) git bundle$"
|
||||
'
|
||||
|
||||
test_expect_success 'git bundle v3 has expected contents' '
|
||||
git branch side HEAD &&
|
||||
git bundle create --version=3 bundle HEAD^..side &&
|
||||
head -n2 bundle >actual &&
|
||||
cat >expect <<-EOF &&
|
||||
# v3 git bundle
|
||||
@object-format=$(test_oid algo)
|
||||
EOF
|
||||
test_cmp expect actual &&
|
||||
git bundle verify bundle
|
||||
'
|
||||
|
||||
test_expect_success 'git bundle v3 rejects unknown capabilities' '
|
||||
cat >new <<-EOF &&
|
||||
# v3 git bundle
|
||||
@object-format=$(test_oid algo)
|
||||
@unknown=silly
|
||||
EOF
|
||||
test_must_fail git bundle verify new 2>output &&
|
||||
test_i18ngrep "unknown capability .unknown=silly." output
|
||||
'
|
||||
|
||||
test_done
|
||||
|
|
Загрузка…
Ссылка в новой задаче