| 1 | #include "git-compat-util.h" |
| 2 | #include "gettext.h" |
| 3 | #include "hex.h" |
| 4 | #include "pkt-line.h" |
| 5 | #include "connect.h" |
| 6 | #include "oid-array.h" |
| 7 | #include "odb.h" |
| 8 | #include "fetch-object-info.h" |
| 9 | #include "string-list.h" |
| 10 | |
| 11 | /* Sends object-info command and its arguments into the request buffer. */ |
| 12 | static void send_object_info_request(const int fd_out, struct object_info_args *args) |
| 13 | { |
| 14 | struct strbuf req_buf = STRBUF_INIT; |
| 15 | |
| 16 | write_command_and_capabilities(&req_buf, "object-info", args->server_options); |
| 17 | |
| 18 | if (unsorted_string_list_has_string(args->object_info_options, "size")) |
| 19 | packet_buf_write(&req_buf, "size"); |
| 20 | else if (args->object_info_options->nr) |
| 21 | BUG("only size should be in object_info_options"); |
| 22 | |
| 23 | if (args->oids) |
| 24 | for (size_t i = 0; i < args->oids->nr; i++) |
| 25 | packet_buf_write(&req_buf, "oid %s", oid_to_hex(&args->oids->oid[i])); |
| 26 | |
| 27 | packet_buf_flush(&req_buf); |
| 28 | if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0) |
| 29 | die_errno(_("unable to write request to remote")); |
| 30 | |
| 31 | strbuf_release(&req_buf); |
| 32 | } |
| 33 | |
| 34 | static int parse_object_size(const char *s, size_t *res) |
| 35 | { |
| 36 | uintmax_t uim; |
| 37 | |
| 38 | if (!s[0] || s[strspn(s, "0123456789")]) |
| 39 | return -1; |
| 40 | errno = 0; |
| 41 | uim = strtoumax(s, NULL, 10); |
| 42 | if (errno || uim > SIZE_MAX) |
| 43 | return -1; |
| 44 | *res = uim; |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | int fetch_object_info(const enum protocol_version version, struct object_info_args *args, |
| 49 | struct packet_reader *reader, struct object_info *object_info_data, |
| 50 | const int stateless_rpc, const int fd_out) |
| 51 | { |
| 52 | int size_index = -1; |
| 53 | |
| 54 | switch (version) { |
| 55 | case protocol_v2: |
| 56 | if (!server_supports_v2("object-info")) |
| 57 | die(_("object-info capability is not enabled on the server")); |
| 58 | /* |
| 59 | * When removing an element from the list it gets swapped by the |
| 60 | * last element, iterate backwards to prevent elements skipping |
| 61 | * evaluation. |
| 62 | * |
| 63 | * object_info_options->nr can be safely casted without overflow |
| 64 | * because the number of options is a small known number (the |
| 65 | * supported placeholders which currently are size and type). |
| 66 | */ |
| 67 | for (int i = (int)args->object_info_options->nr - 1; i >= 0; i--) |
| 68 | if (!server_supports_feature("object-info", |
| 69 | args->object_info_options->items[i].string, 0)) |
| 70 | unsorted_string_list_delete_item(args->object_info_options, i, 0); |
| 71 | |
| 72 | /* |
| 73 | * Even if no options are left, we still send the oid so we get |
| 74 | * at least an existence check. |
| 75 | */ |
| 76 | send_object_info_request(fd_out, args); |
| 77 | break; |
| 78 | case protocol_v1: |
| 79 | case protocol_v0: |
| 80 | die(_("object-info requires protocol v2")); |
| 81 | case protocol_unknown_version: |
| 82 | BUG("unknown protocol version"); |
| 83 | } |
| 84 | |
| 85 | for (size_t i = 0; i < args->object_info_options->nr; i++) { |
| 86 | if (packet_reader_read(reader) != PACKET_READ_NORMAL) { |
| 87 | check_stateless_delimiter(stateless_rpc, reader, |
| 88 | "stateless delimiter expected"); |
| 89 | return -1; |
| 90 | } |
| 91 | |
| 92 | if (!unsorted_string_list_has_string(args->object_info_options, reader->line)) |
| 93 | return -1; |
| 94 | |
| 95 | if (!strcmp(reader->line, "size")) { |
| 96 | /* |
| 97 | * i is the number of supported options which currently |
| 98 | * is only size. No risk of overflow. |
| 99 | */ |
| 100 | size_index = (int)i; |
| 101 | for (size_t j = 0; j < args->oids->nr; j++) |
| 102 | object_info_data[j].sizep = |
| 103 | xcalloc(1, sizeof(*object_info_data[j].sizep)); |
| 104 | } else { |
| 105 | BUG("only size is supported"); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | for (size_t i = 0; |
| 110 | packet_reader_read(reader) == PACKET_READ_NORMAL && |
| 111 | i < args->oids->nr; |
| 112 | i++) { |
| 113 | struct string_list object_info_values = STRING_LIST_INIT_DUP; |
| 114 | |
| 115 | string_list_split(&object_info_values, reader->line, " ", -1); |
| 116 | |
| 117 | if (strcmp(object_info_values.items[0].string, |
| 118 | oid_to_hex(&args->oids->oid[i]))) |
| 119 | die(_("object-info: expected OID: %s, got %s"), |
| 120 | oid_to_hex(&args->oids->oid[i]), |
| 121 | object_info_values.items[0].string); |
| 122 | |
| 123 | /* |
| 124 | * If the response is two elements but the second one is an |
| 125 | * empty string, that means that the OID is unrecognized by the |
| 126 | * server. |
| 127 | */ |
| 128 | if (object_info_values.nr >= 2 && |
| 129 | !strcmp(object_info_values.items[1].string, "")) { |
| 130 | object_info_data[i].unrecognized = 1; |
| 131 | string_list_clear(&object_info_values, 0); |
| 132 | continue; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Because we filter the options to be only the supported by |
| 137 | * the server we expect the server to answer with the same |
| 138 | * number of attributes requested. |
| 139 | */ |
| 140 | if (args->object_info_options->nr + 1 != object_info_values.nr) |
| 141 | die("object-info: unexpected number of attributes: %s", |
| 142 | reader->line); |
| 143 | |
| 144 | if (size_index >= 0 && |
| 145 | parse_object_size(object_info_values.items[size_index + 1].string, |
| 146 | object_info_data[i].sizep)) |
| 147 | die("object-info: ref %s has invalid size %s", |
| 148 | object_info_values.items[0].string, |
| 149 | object_info_values.items[size_index + 1].string); |
| 150 | |
| 151 | string_list_clear(&object_info_values, 0); |
| 152 | } |
| 153 | check_stateless_delimiter(stateless_rpc, reader, "stateless delimiter expected"); |
| 154 | |
| 155 | return 0; |
| 156 | } |