[PATCH v2 8/8] upload-pack: send part of packfile response as uri
- From
- Jonathan Tan <jonathantanmy@google.com>
- Date
- Mar 8, 2019, 21:55 UTC
- Message-ID
- <c7546868cff487727a09841698fe14e089f4a19f.1552073690.git.jonathantanmy@google.com>
- In-Reply-To
- <cover.1552073690.git.jonathantanmy@google.com>
Teach upload-pack to send part of its packfile response as URIs.
An administrator may configure a repository with one or more "uploadpack.blobpackfileuri" lines, each line containing an OID, a pack hash, and a URI. A client may configure fetch.uriprotocols to be a comma-separated list of protocols that it is willing to use to fetch additional packfiles - this list will be sent to the server. Whenever an object with one of those OIDs would appear in the packfile transmitted by upload-pack, the server may exclude that object, and instead send the URI. The client will then download the packs referred to by those URIs before performing the connectivity check.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> --- builtin/pack-objects.c | 76 ++++++++++++++++++++++++++++ fetch-pack.c | 112 +++++++++++++++++++++++++++++++++++++++-- t/t5702-protocol-v2.sh | 57 +++++++++++++++++++++ upload-pack.c | 78 +++++++++++++++++++++++++--- 4 files changed, 312 insertions(+), 11 deletions(-)
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c index a9fac7c128..2fa962c87d 100644 --- a/builtin/pack-objects.c +++ b/builtin/pack-objects.c @@ -110,6 +110,8 @@ static unsigned long window_memory_limit = 0; static struct list_objects_filter_options filter_options; +static struct string_list uri_protocols = STRING_LIST_INIT_NODUP; + enum missing_action { MA_ERROR = 0, /* fail if any missing objects are encountered */ MA_ALLOW_ANY, /* silently allow ALL missing objects */ @@ -118,6 +120,15 @@ enum missing_action { static enum missing_action arg_missing_action; static show_object_fn fn_show_object; +struct configured_exclusion { + struct oidmap_entry e; + char *pack_hash_hex; + char *uri; +}; +static struct oidmap configured_exclusions; + +static struct oidset excluded_by_config; + /* * stats */ @@ -832,6 +843,25 @@ static off_t write_reused_pack(struct hashfile *f) return reuse_packfile_offset - sizeof(struct pack_header); } +static void write_excluded_by_configs(void) +{ + struct oidset_iter iter; + const struct object_id *oid; + + oidset_iter_init(&excluded_by_config, &iter); + while ((oid = oidset_iter_next(&iter))) { + struct configured_exclusion *ex = + oidmap_get(&configured_exclusions, oid); + + if (!ex) + BUG("configured exclusion wasn't configured"); + write_in_full(1, ex->pack_hash_hex, strlen(ex->pack_hash_hex)); + write_in_full(1, " ", 1); + write_in_full(1, ex->uri, strlen(ex->uri)); + write_in_full(1, "\n", 1); + } +} + static const char no_split_warning[] = N_( "disabling bitmap writing, packs are split due to pack.packSizeLimit" ); @@ -1125,6 +1155,25 @@ static int want_object_in_pack(const struct object_id *oid, } } + if (uri_protocols.nr) { + struct configured_exclusion *ex = + oidmap_get(&configured_exclusions, oid); + int i; + const char *p; + + if (ex) { + for (i = 0; i < uri_protocols.nr; i++) { + if (skip_prefix(ex->uri, + uri_protocols.items[i].string, + &p) && + *p == ':') { + oidset_insert(&excluded_by_config, oid); + return 0; + } + } + } + } + return 1; } @@ -2726,6 +2775,29 @@ static int git_pack_config(const char *k, const char *v, void *cb) pack_idx_opts.version); return 0; } + if (!strcmp(k, "uploadpack.blobpackfileuri")) { + struct configured_exclusion *ex = xmalloc(sizeof(*ex)); + const char *oid_end, *pack_end; + /* + * Stores the pack hash. This is not a true object ID, but is + * of the same form. + */ + struct object_id pack_hash; + + if (parse_oid_hex(v, &ex->e.oid, &oid_end) || + *oid_end != ' ' || + parse_oid_hex(oid_end + 1, &pack_hash, &pack_end) || + *pack_end != ' ') + die(_("value of uploadpack.blobpackfileuri must be " + "of the form '<object-hash> <pack-hash> <uri>' (got '%s')"), v); + if (oidmap_get(&configured_exclusions, &ex->e.oid)) + die(_("object already configured in another " + "uploadpack.blobpackfileuri (got '%s')"), v); + ex->pack_hash_hex = xcalloc(1, pack_end - oid_end); + memcpy(ex->pack_hash_hex, oid_end + 1, pack_end - oid_end - 1); + ex->uri = xstrdup(pack_end + 1); + oidmap_put(&configured_exclusions, ex); + } return git_default_config(k, v, cb); } @@ -3318,6 +3390,9 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix) N_("do not pack objects in promisor packfiles")), OPT_BOOL(0, "delta-islands", &use_delta_islands, N_("respect islands during delta compression")), + OPT_STRING_LIST(0, "uri-protocol", &uri_protocols, + N_("protocol"), + N_("exclude any configured uploadpack.blobpackfileuri with this protocol")), OPT_END(), }; @@ -3492,6 +3567,7 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix) return 0; if (nr_result) prepare_pack(window, depth); + write_excluded_by_configs(); write_pack_file(); if (progress) fprintf_ln(stderr, diff --git a/fetch-pack.c b/fetch-pack.c index cf89af21d9..32695f5243 100644 --- a/fetch-pack.c +++ b/fetch-pack.c @@ -38,6 +38,7 @@ static struct lock_file shallow_lock; static const char *alternate_shallow_file; static char *negotiation_algorithm; static struct strbuf fsck_msg_types = STRBUF_INIT; +static struct string_list uri_protocols = STRING_LIST_INIT_DUP; /* Remember to update object flag allocation in object.h */ #define COMPLETE (1U << 0) @@ -755,7 +756,8 @@ static int sideband_demux(int in, int out, void *data) } static int get_pack(struct fetch_pack_args *args, - int xd[2], struct string_list *pack_lockfiles) + int xd[2], struct string_list *pack_lockfiles, + int only_packfile) { struct async demux; int do_keep = args->keep_pack; @@ -815,8 +817,15 @@ static int get_pack(struct fetch_pack_args *args, "--keep=fetch-pack %"PRIuMAX " on %s", (uintmax_t)getpid(), hostname); } - if (args->check_self_contained_and_connected) + if (only_packfile && args->check_self_contained_and_connected) argv_array_push(&cmd.args, "--check-self-contained-and-connected"); + else + /* + * We cannot perform any connectivity checks because + * not all packs have been downloaded; let the caller + * have this responsibility. + */ + args->check_self_contained_and_connected = 0; if (args->from_promisor) argv_array_push(&cmd.args, "--promisor"); } @@ -993,7 +1002,7 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args, alternate_shallow_file = setup_temporary_shallow(si->shallow); else alternate_shallow_file = NULL; - if (get_pack(args, fd, pack_lockfiles)) + if (get_pack(args, fd, pack_lockfiles, 1)) die(_("git fetch-pack: fetch failed.")); all_done: @@ -1148,6 +1157,26 @@ static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out, warning("filtering not recognized by server, ignoring"); } + if (server_supports_feature("fetch", "packfile-uris", 0)) { + int i; + struct strbuf to_send = STRBUF_INIT; + + for (i = 0; i < uri_protocols.nr; i++) { + const char *s = uri_protocols.items[i].string; + + if (!strcmp(s, "https") || !strcmp(s, "http")) { + if (to_send.len) + strbuf_addch(&to_send, ','); + strbuf_addstr(&to_send, s); + } + } + if (to_send.len) { + packet_buf_write(&req_buf, "packfile-uris %s", + to_send.buf); + strbuf_release(&to_send); + } + } + /* add wants */ add_wants(args->no_dependents, wants, &req_buf); @@ -1323,6 +1352,21 @@ static void receive_wanted_refs(struct packet_reader *reader, die(_("error processing wanted refs: %d"), reader->status); } +static void receive_packfile_uris(struct packet_reader *reader, + struct string_list *uris) +{ + process_section_header(reader, "packfile-uris", 0); + while (packet_reader_read(reader) == PACKET_READ_NORMAL) { + if (reader->pktlen < the_hash_algo->hexsz || + reader->line[the_hash_algo->hexsz] != ' ') + die("expected '<hash> <uri>', got: %s\n", reader->line); + + string_list_append(uris, reader->line); + } + if (reader->status != PACKET_READ_DELIM) + die("expected DELIM"); +} + enum fetch_state { FETCH_CHECK_LOCAL = 0, FETCH_SEND_REQUEST, @@ -1344,6 +1388,9 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, int in_vain = 0; int haves_to_send = INITIAL_FLUSH; struct fetch_negotiator negotiator; + struct string_list packfile_uris = STRING_LIST_INIT_DUP; + int i; + fetch_negotiator_init(&negotiator, negotiation_algorithm); packet_reader_init(&reader, fd[0], NULL, 0, PACKET_READ_CHOMP_NEWLINE | @@ -1414,9 +1461,12 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, if (process_section_header(&reader, "wanted-refs", 1)) receive_wanted_refs(&reader, sought, nr_sought); - /* get the pack */ + /* get the pack(s) */ + if (process_section_header(&reader, "packfile-uris", 1)) + receive_packfile_uris(&reader, &packfile_uris); process_section_header(&reader, "packfile", 0); - if (get_pack(args, fd, pack_lockfiles)) + if (get_pack(args, fd, pack_lockfiles, + !packfile_uris.nr)) die(_("git fetch-pack: fetch failed.")); state = FETCH_DONE; @@ -1426,6 +1476,50 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, } } + for (i = 0; i < packfile_uris.nr; i++) { + struct child_process cmd = CHILD_PROCESS_INIT; + char packname[GIT_MAX_HEXSZ + 1]; + const char *uri = packfile_uris.items[i].string + + the_hash_algo->hexsz + 1; + + argv_array_push(&cmd.args, "http-fetch"); + argv_array_push(&cmd.args, "--packfile"); + argv_array_push(&cmd.args, uri); + cmd.git_cmd = 1; + cmd.no_stdin = 1; + cmd.out = -1; + if (start_command(&cmd)) + die("fetch-pack: unable to spawn http-fetch"); + + if (read_in_full(cmd.out, packname, 5) < 0 || + memcmp(packname, "keep\t", 5)) + die("fetch-pack: expected keep then TAB at start of http-fetch output"); + + if (read_in_full(cmd.out, packname, + the_hash_algo->hexsz + 1) < 0 || + packname[the_hash_algo->hexsz] != '\n') + die("fetch-pack: expected hash then LF at end of http-fetch output"); + + packname[the_hash_algo->hexsz] = '\0'; + + close(cmd.out); + + if (finish_command(&cmd)) + die("fetch-pack: unable to finish http-fetch"); + + if (memcmp(packfile_uris.items[i].string, packname, + the_hash_algo->hexsz)) + die("fetch-pack: pack downloaded from %s does not match expected hash %.*s", + uri, (int) the_hash_algo->hexsz, + packfile_uris.items[i].string); + + string_list_append_nodup(pack_lockfiles, + xstrfmt("%s/pack/pack-%s.keep", + get_object_directory(), + packname)); + } + string_list_clear(&packfile_uris, 0); + negotiator.release(&negotiator); oidset_clear(&common); return ref; @@ -1465,6 +1559,14 @@ static void fetch_pack_config(void) git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects); git_config_get_string("fetch.negotiationalgorithm", &negotiation_algorithm); + if (!uri_protocols.nr) { + char *str; + + if (!git_config_get_string("fetch.uriprotocols", &str) && str) { + string_list_split(&uri_protocols, str, ',', -1); + free(str); + } + } git_config(fetch_pack_config_cb, NULL); } diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh index db4ae09f2f..6784dfe279 100755 --- a/t/t5702-protocol-v2.sh +++ b/t/t5702-protocol-v2.sh @@ -656,6 +656,63 @@ test_expect_success 'when server does not send "ready", expect FLUSH' ' test_i18ngrep "expected no other sections to be sent after no .ready." err ' +configure_exclusion () { + git -C "$1" hash-object "$2" >objh && + git -C "$1" pack-objects "$HTTPD_DOCUMENT_ROOT_PATH/mypack" <objh >packh && + git -C "$1" config --add \ + "uploadpack.blobpackfileuri" \ + "$(cat objh) $(cat packh) $HTTPD_URL/dumb/mypack-$(cat packh).pack" && + cat objh +} + +test_expect_success 'part of packfile response provided as URI' ' + P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" && + rm -rf "$P" http_child log && + + git init "$P" && + git -C "$P" config "uploadpack.allowsidebandall" "true" && + + echo my-blob >"$P/my-blob" && + git -C "$P" add my-blob && + echo other-blob >"$P/other-blob" && + git -C "$P" add other-blob && + git -C "$P" commit -m x && + + configure_exclusion "$P" my-blob >h && + configure_exclusion "$P" other-blob >h2 && + + GIT_TRACE=1 GIT_TRACE_PACKET="$(pwd)/log" GIT_TEST_SIDEBAND_ALL=1 \ + git -c protocol.version=2 \ + -c fetch.uriprotocols=http,https \ + clone "$HTTPD_URL/smart/http_parent" http_child && + + # Ensure that my-blob and other-blob are in separate packfiles. + for idx in http_child/.git/objects/pack/*.idx + do + git verify-pack --verbose $idx >out && + { + grep "^[0-9a-f]\{16,\} " out || : + } >out.objectlist && + if test_line_count = 1 out.objectlist + then + if grep $(cat h) out + then + >hfound + fi && + if grep $(cat h2) out + then + >h2found + fi + fi + done && + test -f hfound && + test -f h2found && + + # Ensure that there are exactly 6 files (3 .pack and 3 .idx). + ls http_child/.git/objects/pack/* >filelist && + test_line_count = 6 filelist +' + stop_httpd test_done diff --git a/upload-pack.c b/upload-pack.c index 987d2e139b..d36e1fc06a 100644 --- a/upload-pack.c +++ b/upload-pack.c @@ -105,9 +105,12 @@ static int write_one_shallow(const struct commit_graft *graft, void *cb_data) struct output_state { char buffer[8193]; int used; + unsigned packfile_uris_started : 1; + unsigned packfile_started : 1; }; -static int relay_pack_data(int pack_objects_out, struct output_state *os) +static int relay_pack_data(int pack_objects_out, struct output_state *os, + int write_packfile_line) { /* * We keep the last byte to ourselves @@ -128,6 +131,37 @@ static int relay_pack_data(int pack_objects_out, struct output_state *os) } os->used += readsz; + while (!os->packfile_started) { + char *p; + if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) { + os->packfile_started = 1; + if (write_packfile_line) { + if (os->packfile_uris_started) + packet_delim(1); + packet_write_fmt(1, "\1packfile\n"); + } + break; + } + if ((p = memchr(os->buffer, '\n', os->used))) { + if (!os->packfile_uris_started) { + os->packfile_uris_started = 1; + if (!write_packfile_line) + BUG("packfile_uris requires sideband-all"); + packet_write_fmt(1, "\1packfile-uris\n"); + } + *p = '\0'; + packet_write_fmt(1, "\1%s\n", os->buffer); + + os->used -= p - os->buffer + 1; + memmove(os->buffer, p + 1, os->used); + } else { + /* + * Incomplete line. + */ + return readsz; + } + } + if (os->used > 1) { send_client_data(1, os->buffer, os->used - 1); os->buffer[0] = os->buffer[os->used - 1]; @@ -141,7 +175,8 @@ static int relay_pack_data(int pack_objects_out, struct output_state *os) } static void create_pack_file(const struct object_array *have_obj, - const struct object_array *want_obj) + const struct object_array *want_obj, + const struct string_list *uri_protocols) { struct child_process pack_objects = CHILD_PROCESS_INIT; struct output_state output_state = {0}; @@ -192,6 +227,11 @@ static void create_pack_file(const struct object_array *have_obj, expanded_filter_spec.buf); } } + if (uri_protocols) { + for (i = 0; i < uri_protocols->nr; i++) + argv_array_pushf(&pack_objects.args, "--uri-protocol=%s", + uri_protocols->items[0].string); + } pack_objects.in = -1; pack_objects.out = -1; @@ -278,7 +318,8 @@ static void create_pack_file(const struct object_array *have_obj, } if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) { int result = relay_pack_data(pack_objects.out, - &output_state); + &output_state, + !!uri_protocols); if (result == 0) { close(pack_objects.out); @@ -1123,7 +1164,7 @@ void upload_pack(struct upload_pack_options *options) if (want_obj.nr) { struct object_array have_obj = OBJECT_ARRAY_INIT; get_common_commits(&reader, &have_obj, &want_obj); - create_pack_file(&have_obj, &want_obj); + create_pack_file(&have_obj, &want_obj, 0); } } @@ -1138,6 +1179,7 @@ struct upload_pack_data { timestamp_t deepen_since; int deepen_rev_list; int deepen_relative; + struct string_list uri_protocols; struct packet_writer writer; @@ -1157,6 +1199,7 @@ static void upload_pack_data_init(struct upload_pack_data *data) struct oid_array haves = OID_ARRAY_INIT; struct object_array shallows = OBJECT_ARRAY_INIT; struct string_list deepen_not = STRING_LIST_INIT_DUP; + struct string_list uri_protocols = STRING_LIST_INIT_DUP; memset(data, 0, sizeof(*data)); data->wants = wants; @@ -1164,6 +1207,7 @@ static void upload_pack_data_init(struct upload_pack_data *data) data->haves = haves; data->shallows = shallows; data->deepen_not = deepen_not; + data->uri_protocols = uri_protocols; packet_writer_init(&data->writer, 1); } @@ -1322,9 +1366,17 @@ static void process_args(struct packet_reader *request, continue; } + if (skip_prefix(arg, "packfile-uris ", &p)) { + string_list_split(&data->uri_protocols, p, ',', -1); + continue; + } + /* ignore unknown lines maybe? */ die("unexpected line: '%s'", arg); } + + if (data->uri_protocols.nr && !data->writer.use_sideband) + string_list_clear(&data->uri_protocols, 0); } static int process_haves(struct oid_array *haves, struct oid_array *common, @@ -1514,8 +1566,13 @@ int upload_pack_v2(struct repository *r, struct argv_array *keys, send_wanted_ref_info(&data); send_shallow_info(&data, &want_obj); - packet_writer_write(&data.writer, "packfile\n"); - create_pack_file(&have_obj, &want_obj); + if (data.uri_protocols.nr) { + create_pack_file(&have_obj, &want_obj, + &data.uri_protocols); + } else { + packet_write_fmt(1, "packfile\n"); + create_pack_file(&have_obj, &want_obj, NULL); + } state = FETCH_DONE; break; case FETCH_DONE: @@ -1536,6 +1593,7 @@ int upload_pack_advertise(struct repository *r, int allow_filter_value; int allow_ref_in_want; int allow_sideband_all_value; + char *str = NULL; strbuf_addstr(value, "shallow"); @@ -1557,6 +1615,14 @@ int upload_pack_advertise(struct repository *r, &allow_sideband_all_value) && allow_sideband_all_value)) strbuf_addstr(value, " sideband-all"); + + if (!repo_config_get_string(the_repository, + "uploadpack.blobpackfileuri", + &str) && + str) { + strbuf_addstr(value, " packfile-uris"); + free(str); + } } return 1;
-- 2.19.0.271.gfe8321ec05.dirty