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bundle: detect hash algorithm when reading refs 

Much like with the dumb HTTP transport, there isn't a way to explicitly
specify the hash algorithm when dealing with a bundle, so detect the
algorithm based on the length of the object IDs in the prerequisites and
ref advertisements.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson 2020-06-19 17:56:00 +00:00 committed by Junio C Hamano
parent 371c4079f4
commit 6161ce7bbe
3 changed files with 30 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
bundle.c
View File

@ -23,6 +23,17 @@ 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)
{
size_t len = strcspn(buf->buf, " \n");
int algo;
algo = hash_algo_by_length(len / 2);
if (algo == GIT_HASH_UNKNOWN)
return NULL;
return &hash_algos[algo];
}
static int parse_bundle_header(int fd, struct bundle_header *header,
const char *report_path)
{
@ -52,12 +63,21 @@ static int parse_bundle_header(int fd, struct bundle_header *header,
}
strbuf_rtrim(&buf);
if (!header->hash_algo) {
header->hash_algo = detect_hash_algo(&buf);
if (!header->hash_algo) {
error(_("unknown hash algorithm length"));
status = -1;
break;
}
}
/*
* Tip lines have object name, SP, and refname.
* Prerequisites have object name that is optionally
* followed by SP and subject line.
*/
if (parse_oid_hex(buf.buf, &oid, &p) ||
if (parse_oid_hex_algop(buf.buf, &oid, &p, header->hash_algo) ||
(*p && !isspace(*p)) ||
(!is_prereq && !*p)) {
if (report_path)

1
bundle.h
View File

@ -15,6 +15,7 @@ struct ref_list {
struct bundle_header {
struct ref_list prerequisites;
struct ref_list references;
const struct git_hash_algo *hash_algo;
};
int is_bundle(const char *path, int quiet);

10
transport.c
View File

@ -143,6 +143,9 @@ static struct ref *get_refs_from_bundle(struct transport *transport,
data->fd = read_bundle_header(transport->url, &data->header);
if (data->fd < 0)
die(_("could not read bundle '%s'"), transport->url);
transport->hash_algo = data->header.hash_algo;
for (i = 0; i < data->header.references.nr; i++) {
struct ref_list_entry *e = data->header.references.list + i;
struct ref *ref = alloc_ref(e->name);
@ -157,11 +160,14 @@ static int fetch_refs_from_bundle(struct transport *transport,
int nr_heads, struct ref **to_fetch)
{
struct bundle_transport_data *data = transport->data;
int ret;
if (!data->get_refs_from_bundle_called)
get_refs_from_bundle(transport, 0, NULL);
return unbundle(the_repository, &data->header, data->fd,
transport->progress ? BUNDLE_VERBOSE : 0);
ret = unbundle(the_repository, &data->header, data->fd,
transport->progress ? BUNDLE_VERBOSE : 0);
transport->hash_algo = data->header.hash_algo;
return ret;
}
static int close_bundle(struct transport *transport)