On 01/31, Derrick Stolee wrote:
> On 1/25/2018 6:58 PM, Brandon Williams wrote:
> > In order to prepare for the addition of protocol_v2 push the protocol
> > version discovery outside of 'get_remote_heads()'. This will allow for
> > keeping the logic for processing the reference advertisement for
> > protocol_v1 and protocol_v0 separate from the logic for protocol_v2.
> >
> > Signed-off-by: Brandon Williams <bmwill@xxxxxxxxxx>
> > ---
> > builtin/fetch-pack.c | 16 +++++++++++++++-
> > builtin/send-pack.c | 17 +++++++++++++++--
> > connect.c | 27 ++++++++++-----------------
> > connect.h | 3 +++
> > remote-curl.c | 20 ++++++++++++++++++--
> > remote.h | 5 +++--
> > transport.c | 24 +++++++++++++++++++-----
> > 7 files changed, 83 insertions(+), 29 deletions(-)
> >
> > diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
> > index 366b9d13f..85d4faf76 100644
> > --- a/builtin/fetch-pack.c
> > +++ b/builtin/fetch-pack.c
> > @@ -4,6 +4,7 @@
> > #include "remote.h"
> > #include "connect.h"
> > #include "sha1-array.h"
> > +#include "protocol.h"
> > static const char fetch_pack_usage[] =
> > "git fetch-pack [--all] [--stdin] [--quiet | -q] [--keep | -k] [--thin] "
> > @@ -52,6 +53,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
> > struct fetch_pack_args args;
> > struct oid_array shallow = OID_ARRAY_INIT;
> > struct string_list deepen_not = STRING_LIST_INIT_DUP;
> > + struct packet_reader reader;
> > packet_trace_identity("fetch-pack");
> > @@ -193,7 +195,19 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
> > if (!conn)
> > return args.diag_url ? 0 : 1;
> > }
> > - get_remote_heads(fd[0], NULL, 0, &ref, 0, NULL, &shallow);
> > +
> > + packet_reader_init(&reader, fd[0], NULL, 0,
> > + PACKET_READ_CHOMP_NEWLINE |
> > + PACKET_READ_GENTLE_ON_EOF);
> > +
> > + switch (discover_version(&reader)) {
> > + case protocol_v1:
> > + case protocol_v0:
> > + get_remote_heads(&reader, &ref, 0, NULL, &shallow);
> > + break;
> > + case protocol_unknown_version:
> > + BUG("unknown protocol version");
>
> Is this really a BUG in the client, or a bug/incompatibility in the server?
>
> Perhaps I'm misunderstanding, but it looks like discover_version() will
> die() on an unknown version (the die() is in
> protocol.c:determine_protocol_version_client()). So maybe that's why this is
> a BUG()?
>
> If there is something to change here, this BUG() appears three more times.
Yes, I have it labeled as a BUG because discover_version can't return an
unknown protocol version. If the server actually returns an unknown
protocol version then it should be handled in
protocol.c:determine_protocol_version_client() as you mentioned.
>
> > + }
> > ref = fetch_pack(&args, fd, conn, ref, dest, sought, nr_sought,
> > &shallow, pack_lockfile_ptr);
> > diff --git a/builtin/send-pack.c b/builtin/send-pack.c
> > index fc4f0bb5f..83cb125a6 100644
> > --- a/builtin/send-pack.c
> > +++ b/builtin/send-pack.c
> > @@ -14,6 +14,7 @@
> > #include "sha1-array.h"
> > #include "gpg-interface.h"
> > #include "gettext.h"
> > +#include "protocol.h"
> > static const char * const send_pack_usage[] = {
> > N_("git send-pack [--all | --mirror] [--dry-run] [--force] "
> > @@ -154,6 +155,7 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
> > int progress = -1;
> > int from_stdin = 0;
> > struct push_cas_option cas = {0};
> > + struct packet_reader reader;
> > struct option options[] = {
> > OPT__VERBOSITY(&verbose),
> > @@ -256,8 +258,19 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
> > args.verbose ? CONNECT_VERBOSE : 0);
> > }
> > - get_remote_heads(fd[0], NULL, 0, &remote_refs, REF_NORMAL,
> > - &extra_have, &shallow);
> > + packet_reader_init(&reader, fd[0], NULL, 0,
> > + PACKET_READ_CHOMP_NEWLINE |
> > + PACKET_READ_GENTLE_ON_EOF);
> > +
> > + switch (discover_version(&reader)) {
> > + case protocol_v1:
> > + case protocol_v0:
> > + get_remote_heads(&reader, &remote_refs, REF_NORMAL,
> > + &extra_have, &shallow);
> > + break;
> > + case protocol_unknown_version:
> > + BUG("unknown protocol version");
> > + }
> > transport_verify_remote_names(nr_refspecs, refspecs);
> > diff --git a/connect.c b/connect.c
> > index 00e90075c..db3c9d24c 100644
> > --- a/connect.c
> > +++ b/connect.c
> > @@ -62,7 +62,7 @@ static void die_initial_contact(int unexpected)
> > "and the repository exists."));
> > }
> > -static enum protocol_version discover_version(struct packet_reader *reader)
> > +enum protocol_version discover_version(struct packet_reader *reader)
> > {
> > enum protocol_version version = protocol_unknown_version;
> > @@ -234,7 +234,7 @@ enum get_remote_heads_state {
> > /*
> > * Read all the refs from the other end
> > */
> > -struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
> > +struct ref **get_remote_heads(struct packet_reader *reader,
> > struct ref **list, unsigned int flags,
> > struct oid_array *extra_have,
> > struct oid_array *shallow_points)
> > @@ -242,24 +242,17 @@ struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
> > struct ref **orig_list = list;
> > int len = 0;
> > enum get_remote_heads_state state = EXPECTING_FIRST_REF;
> > - struct packet_reader reader;
> > const char *arg;
> > - packet_reader_init(&reader, in, src_buf, src_len,
> > - PACKET_READ_CHOMP_NEWLINE |
> > - PACKET_READ_GENTLE_ON_EOF);
> > -
> > - discover_version(&reader);
> > -
> > *list = NULL;
> > while (state != EXPECTING_DONE) {
> > - switch (packet_reader_read(&reader)) {
> > + switch (packet_reader_read(reader)) {
> > case PACKET_READ_EOF:
> > die_initial_contact(1);
> > case PACKET_READ_NORMAL:
> > - len = reader.pktlen;
> > - if (len > 4 && skip_prefix(reader.line, "ERR ", &arg))
> > + len = reader->pktlen;
> > + if (len > 4 && skip_prefix(reader->line, "ERR ", &arg))
> > die("remote error: %s", arg);
> > break;
> > case PACKET_READ_FLUSH:
> > @@ -271,22 +264,22 @@ struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
> > switch (state) {
> > case EXPECTING_FIRST_REF:
> > - process_capabilities(reader.line, &len);
> > - if (process_dummy_ref(reader.line)) {
> > + process_capabilities(reader->line, &len);
> > + if (process_dummy_ref(reader->line)) {
> > state = EXPECTING_SHALLOW;
> > break;
> > }
> > state = EXPECTING_REF;
> > /* fallthrough */
> > case EXPECTING_REF:
> > - if (process_ref(reader.line, len, &list, flags, extra_have))
> > + if (process_ref(reader->line, len, &list, flags, extra_have))
> > break;
> > state = EXPECTING_SHALLOW;
> > /* fallthrough */
> > case EXPECTING_SHALLOW:
> > - if (process_shallow(reader.line, len, shallow_points))
> > + if (process_shallow(reader->line, len, shallow_points))
> > break;
> > - die("protocol error: unexpected '%s'", reader.line);
> > + die("protocol error: unexpected '%s'", reader->line);
> > case EXPECTING_DONE:
> > break;
> > }
> > diff --git a/connect.h b/connect.h
> > index 01f14cdf3..cdb8979dc 100644
> > --- a/connect.h
> > +++ b/connect.h
> > @@ -13,4 +13,7 @@ extern int parse_feature_request(const char *features, const char *feature);
> > extern const char *server_feature_value(const char *feature, int *len_ret);
> > extern int url_is_local_not_ssh(const char *url);
> > +struct packet_reader;
> > +extern enum protocol_version discover_version(struct packet_reader *reader);
> > +
> > #endif
> > diff --git a/remote-curl.c b/remote-curl.c
> > index 0053b0954..9f6d07683 100644
> > --- a/remote-curl.c
> > +++ b/remote-curl.c
> > @@ -1,6 +1,7 @@
> > #include "cache.h"
> > #include "config.h"
> > #include "remote.h"
> > +#include "connect.h"
> > #include "strbuf.h"
> > #include "walker.h"
> > #include "http.h"
> > @@ -13,6 +14,7 @@
> > #include "credential.h"
> > #include "sha1-array.h"
> > #include "send-pack.h"
> > +#include "protocol.h"
> > static struct remote *remote;
> > /* always ends with a trailing slash */
> > @@ -176,8 +178,22 @@ static struct discovery *last_discovery;
> > static struct ref *parse_git_refs(struct discovery *heads, int for_push)
> > {
> > struct ref *list = NULL;
> > - get_remote_heads(-1, heads->buf, heads->len, &list,
> > - for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
> > + struct packet_reader reader;
> > +
> > + packet_reader_init(&reader, -1, heads->buf, heads->len,
> > + PACKET_READ_CHOMP_NEWLINE |
> > + PACKET_READ_GENTLE_ON_EOF);
> > +
> > + switch (discover_version(&reader)) {
> > + case protocol_v1:
> > + case protocol_v0:
> > + get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
> > + NULL, &heads->shallow);
> > + break;
> > + case protocol_unknown_version:
> > + BUG("unknown protocol version");
> > + }
> > +
> > return list;
> > }
> > diff --git a/remote.h b/remote.h
> > index 1f6611be2..2016461df 100644
> > --- a/remote.h
> > +++ b/remote.h
> > @@ -150,10 +150,11 @@ int check_ref_type(const struct ref *ref, int flags);
> > void free_refs(struct ref *ref);
> > struct oid_array;
> > -extern struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
> > +struct packet_reader;
> > +extern struct ref **get_remote_heads(struct packet_reader *reader,
> > struct ref **list, unsigned int flags,
> > struct oid_array *extra_have,
> > - struct oid_array *shallow);
> > + struct oid_array *shallow_points);
> > int resolve_remote_symref(struct ref *ref, struct ref *list);
> > int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid);
> > diff --git a/transport.c b/transport.c
> > index 8e8779096..63c3dbab9 100644
> > --- a/transport.c
> > +++ b/transport.c
> > @@ -18,6 +18,7 @@
> > #include "sha1-array.h"
> > #include "sigchain.h"
> > #include "transport-internal.h"
> > +#include "protocol.h"
> > static void set_upstreams(struct transport *transport, struct ref *refs,
> > int pretend)
> > @@ -190,13 +191,26 @@ static int connect_setup(struct transport *transport, int for_push)
> > static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
> > {
> > struct git_transport_data *data = transport->data;
> > - struct ref *refs;
> > + struct ref *refs = NULL;
> > + struct packet_reader reader;
> > connect_setup(transport, for_push);
> > - get_remote_heads(data->fd[0], NULL, 0, &refs,
> > - for_push ? REF_NORMAL : 0,
> > - &data->extra_have,
> > - &data->shallow);
> > +
> > + packet_reader_init(&reader, data->fd[0], NULL, 0,
> > + PACKET_READ_CHOMP_NEWLINE |
> > + PACKET_READ_GENTLE_ON_EOF);
> > +
> > + switch (discover_version(&reader)) {
> > + case protocol_v1:
> > + case protocol_v0:
> > + get_remote_heads(&reader, &refs,
> > + for_push ? REF_NORMAL : 0,
> > + &data->extra_have,
> > + &data->shallow);
> > + break;
> > + case protocol_unknown_version:
> > + BUG("unknown protocol version");
> > + }
> > data->got_remote_heads = 1;
> > return refs;
>
--
Brandon Williams
